What are the Advantages of Accelerometer Sensor?

 The accelerometer senor consists of detection quality (also known as sensitive mass), supports, potentiometers, springs, dampers, and shells. The constraint of the test quality can only be moved along one axis, which is called the input shaft or the sensitive axis. When the instrument shell Accelerates along the sensitive axis as the carrier moves, according to Newton’s law, the detection quality with certain inertia tries to keep its original motion state unchanged.

The relative motion between the accelerometer and the shell will result in the deformation of the spring, so the detection quality accelerates with the effect of the spring force. When the spring force is in equilibrium with the inertia force generated by acceleration of the detection mass, there will be no relative motion between the detection mass and the shell. The deformation of the spring reflects the magnitude of the acceleration measured. The potentiometer, as a displacement sensor, converts the acceleration signal to an electrical signal for output. The accelerometer is essentially an oscillating system with one degree of freedom, and a damper should be used to improve the dynamic quality of the system.

Advantages of acceleration sensors

The acceleration sensor has the characteristics of high precision and high sensitivity. It can accurately measure the acceleration change of the object during the movement and output it as a digital signal. This feature of high precision and high sensitivity. For example, the zero-bias stability of ER-QA-03A is 10-50μg, the scale factor is 15-50 PPM, and the second-order nonlinearity is 10-30μg/g2, which provides accurate data support in the industrial field to help engineers perform accurate motion control and analysis.

The acceleration sensor has the characteristics of small size and light weight. This allows acceleration sensors to be easily installed in a variety of devices and structures without placing too much of a burden on them. The small size and lightweight also mean that acceleration sensors can operate in limited Spaces and have high reliability. The ER-QA-03F is a small accelerometer with a diameter of Φ18.2mm, a scale factor of 150-220 PPM, and a second-order nonlinearity of 40-50μg/g2. For devices with strict space requirements, this accelerometer is a good choice.

Acceleration sensors have a wide operating temperature range. Whether it is in an extremely cold environment or in a high temperature environment, the acceleration sensor can work properly. This makes it possible to use it in extreme conditions, such as aerospace and deep sea exploration. ER-QA-03D can operate normally at a working temperature of -55~180 ° C, and its volume of 25×21mm, impact resistance 500-1000g 0.5ms.

The acceleration sensor has the function of self-diagnosis and fault detection. With internal algorithms and automatic calibration, the accelerometer detects and corrects its own faults, ensuring data accuracy and reliability. This self-diagnosis and fault detection capability helps reduce maintenance costs and increase productivity.

Quartz flexible accelerometer adopts the principle of flexible deformation of quartz material, uses external force to act on the mass of the flexible arm to make it flex, and measures the change of the flex signal to determine the acceleration. Quartz flexible accelerometer has the advantages of high precision, high sensitivity and high stability, but the manufacturing cost is high and the volume is large. MEMS accelerometers use microelectromechanical system technology to measure the acceleration using micro mechanical structure and electronic components. MEMS accelerometers have the advantages of small size, light weight, low power consumption and low cost, but the accuracy and stability are relatively low.

Quartz flexible accelerometers and MEMS accelerometers also have certain differences in application fields. Because the quartz flexible accelerometer has high precision and high stability, it is widely used in high-end fields such as military and aerospace. MEMS accelerometers are widely used in consumer electronics, automotive safety systems, sports bracelets and other fields because of their small size, low power consumption and low cost.

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What are Three Examples of Ways to Use a Tilt Sensor?

 A tilt sensor is a sensor used to measure the tilt angle of an object relative to the horizontal plane. It can accurately and real-time monitor and record the change of tilt angle, which provides important data support for various industrial applications and scientific research fields. 

Today we have three examples of how tilt sensors can be used in application scenarios.

1. Bridge monitoring: Bridge is an important part of urban traffic, and its stability and safety are crucial to the normal operation of the city. In order to ensure the safety of the bridge, it is necessary to monitor its structure in real time. Tilt sensor can be used to monitor the tilt angle of bridge and provide real-time data support for structural safety. By installing tilt sensors at key parts of the bridge, the tilt angle can be continuously monitored and the data can be transmitted to the control center for analysis. Once abnormal conditions are found, timely measures can be taken for maintenance and reinforcement, thus ensuring the safe use of the bridge.

2. Construction machinery

Excavator, in order to realize the three-dimensional spatial positioning of the excavator, on the basis of installing the angle sensors of each joint of the working device, the platform rotation angle detection device and the platform inclination sensor are installed, and the laser receiver is installed on the bucket rod to detect the height of the horizontal mechanism emitted by the ground laser transmitter relative to the zero position of the receiver. The kinematics model of the excavator is established, and the coordinate transformation matrix of the car body relative to the earth is derived, that is, the car body positioning in three-dimensional space is completed, and the commonly used simple car body elevation positioning formula is obtained, so as to realize the three-dimensional space positioning of the excavator's excavation trajectory and lay the foundation for realizing the accuracy of the excavator's three-dimensional space trajectory and the excavator's depth control.

Other heavy industrial machinery - in addition to excavators, in other heavy industrial machinery, including cranes, lifts, graders, etc., will use tilt sensors, and tilt sensors have a heavy and heavy role in these heavy machinery equipment. It not only ensures that the angle range of these mechanical equipment is within the safety, but also can be raised to the alarm if it is out of range to protect personal safety. For example, the inclination sensor in the retractable mechanical hand is to measure the attitude of the cab and the change in the tilt angle of the boom to ensure driving safety.

3. Platform control

Shipborne horizontal platform - The inclination sensor is applied on the shipborne horizontal platform, which is used for shipborne satellite to track the base of the antenna to keep the antenna in a horizontal state at all times, and for real-time control of the platform, which can isolate the pitch and roll motion of the hull and make the platform level.

In addition, the inclination sensor is also applied in the launching process of the ship air bag, and is applied to the hook swing of the large pipe laying ship for monitoring and adjustment.

Application of inclination sensor in automatic levelling system of reference plane of large optoelectronic equipment. The dip angle sensor installed on the base detects the dip angle and direction of the reference plane, converts the angle into the elongation of several mechanical legs according to the leveling algorithm, and drives the elongation of the mechanical legs to make the reference plane level.

Ericco's ER-TS-12200-Modbus and ER-TS-32600-Modbus tilt sensors can be used in bridge monitoring, construction machinery, platform control and other fields.

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How is IMU used in drones?

First of all, we know that the IMU combines a 3-axis accelerometer and a 3-axis gyroscope, which can provide the UAV with the data needed to maintain stable flight, and can be integrated with other systems such as GPS for dead reckoning navigation. Because these functions are so critical, a drone can often use multiple IMUs for greater accuracy and redundancy.

The main reasons include: The IMU can be used as a backup in the event that the drone's other vital navigation systems, such as GPS, are blocked, interrupted or completely disabled. In addition, IMU is also indispensable for applications that cannot use GPS and other similar services at all.

Ericco continues to innovate and research, and has developed a product ER-MIMU-01 that can be used in drones to perform the initial alignment of the drone launch system. ER-MIMU-01ER-MIMU-01 uses high-quality and reliable MEMS accelerometer and gyroscope, RS422 communicates with the outside, the baud rate can be flexibly set between 9600~921600, and the communication baud rate required by the user is set through the communication protocol. Equipped with X, Y, Z three-axis precision gyroscope, X, Y, Z three-axis accelerometer, with high resolution, it can output the original hexadecimal complement of X, Y, Z three-axis gyroscope and accelerometer through RS422 code data (including gyroscope hexadecimal complement) numerical temperature, angle, accelerometer hexadecimal temperature, acceleration hexadecimal complement); it can also output gyroscope and accelerometer data that have been processed by underlying calculations Floating point dimensionless value.

On the other hand, since UAVs adopt vision-based positioning and collision avoidance principles, OIS/EIS can be used as another input that can be used for flight stability.

Drones are also popular for carrying on-board cameras for aerial still pictures and videos. With the help of IMU and OIS/EIS software, any drone can be turned into a high-resolution camera. If you want to know more about imu, please click the link below.

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How does the Inclinometer Sensor Work?

The inclinometer sensor is actually an application of the MEMS accelerometer, which is the principle that the accelerometer can be used to measure the angular velocity of an object in a static state.

The inclinometer sensor’s theory is based on Newton’s second law: according to the basic principles of physics, inside a system, velocity cannot be measured, but acceleration can be measured. If the initial speed is known, the line speed can be calculated by integrating, and then the linear displacement can be calculated, so it is actually an acceleration sensor using the principle of inertia. When the inclinometer sensor is at rest, that is, there is no acceleration in the side and vertical directions, then the only force acting on it is the acceleration of gravity. The angle between the vertical axis of gravity and the sensitive axis of the acceleration sensor is the angle of inclination. The inclinometer sensor in the general sense is static measurement or quasi-static measurement, once there is external acceleration, then the acceleration measured by the acceleration chip contains the external acceleration, so the calculated angle is not accurate, therefore, the common practice is to increase the mems gyro chip, and adopt the preferred Kalman filter algorithm. The ER-TS-3260VO‘s built-in (MEMS) solid pendulum can measure changes in the static gravity field, convert them into changes in inclination, and output them through voltage (0~10V, 0~5V optional), so that the calculated angle is quite accurate.

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How to Distinguish North Finder and Theodolite?

 In the inertial navigation industry, these two instruments It is often used. Let’s talk about the difference between the North Finder and theodolite today.

The north finder is also called the gyro north finder, which is a high-precision dual-axis dynamic tuned gyro. The purpose is to find the true north direction value of the object. Ericco’s ER-MNS-05 (0.25°/1°), it can also be combined. Acceleration is used to measure and correct the horizontal angle, which is mainly used in the fields of borehole directional instrument, drilling equipment control and measurement, marine survey, three-dimensional scanner, radar, antenna, military vehicle and so on. The principle is to determine the true north direction value of the attached carrier autonomously by measuring the angular velocity of the earth’s rotation, without being disturbed and affected by external magnetic fields or other environments. In addition, it can also be combined with acceleration for horizontal angle measurement and correction.

1. Analytical fast north finding principle

The analytical fast north finding is mainly composed of inertial sensor components, horizontal turntable, base (including shock absorber), control circuit and computer. The inertial sensor component is mainly composed of a flexible gyroscope and an accelerometer meter, which is used to sense the angular velocity of the earth’s rotation and the acceleration of gravity.

2. Decomposition of the angular velocity of the earth’s rotation

The earth’s rotation angular velocity (15.0411 degrees/h, 7.29213101e-5rad/s) vector is parallel to the earth’s axis, and the north direction is positive. At any point P on the earth’s surface, the rotation angular velocity at that point can be decomposed into a vertical component and a horizontal component, which is the latitude value of point P. The true north position refers to the direction of the horizontal component of the earth’s rotation angular velocity.

3. The principle of gyro north finding in the horizontal state of the platform

The selected flexible gyro for north-seeking azimuth vertical reference is a dual-axis rate gyro, which has two orthogonal input X, Y and two corresponding output shafts, and the rotor axis is the Z axis. Ericco’s MEMS gyroscope ER-MG2-100 is used for north finding, and the built-in IMU is used for inclination measurement and azimuth calculation.  In order to eliminate the influence of the vertical component, it is always desired that the XY axis of the gyro is in the horizontal plane (or as close as possible to the horizontal state). At this time, the horizontal component of the ground speed sensitive to the two axes is related to the north-seeking angle.

Theodolite is a measuring instrument designed to measure horizontal and vertical angles based on the principle of angle measurement. Its function is to accurately measure the horizontal and vertical angles of the measuring object. It is mostly used in many fields such as construction, road and bridge construction. 

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What Does IMU Mean for A Drone?

The full name of “unmanned aircraft” is unmanned aircraft, which is operated by radio remote control equipment and self-provided program control devices, or by the on-board computer fully or intermittently autonomous operation. In order to make the UAV fly perfectly, IMU(Inertial Measurement Unit), gyroscope stabilization and flight controller technology are essential.

The flight control of UAV is composed of main control MCU and inertial measurement module IMU. IMU provides the original sensor data of the aircraft’s attitude in space, and the data of the aircraft is generally provided by the gyroscope sensor/acceleration sensor/electronic compass. Gyroscopic stabilization technology is one of the most important components, allowing the drone to fly super-smoothly even in strong winds and gusts. This smooth flight allows us to take fantastic aerial views of the beautiful planet. With excellent flight stability and waypoint navigation, the UAV can generate high-quality 3D photogrammetry and liDAR images. The latest drones use an integrated head, which also includes built-in gyroscopic stabilization technology, so that the on-board camera or sensor has little to no vibration. This allows us to capture perfect aerial film and photographs. In order to meet the requirements of UAV equipment, the gyroscope installed in MIMU-02 not only adopts an advanced differential sensor design, which can eliminate the influence of linear acceleration and work in extremely harsh environments in the presence of shock and vibration, It also has a measurement range of 400 degrees/second and a deviation instability of 0.01°/hour. Able to measure angular velocity up to ±400°/s and has a digital output protocol compliant with Mode 3 SPI. Angular rate data is represented as 24-bit words.

The application of IMU in UAVs is not limited to attitude control and flight stability. It can also be used with other sensors such as GPS (Global Positioning System) and magnetometers to provide more accurate navigation and positioning information. At the same time, IMU can also be used for UAV attitude estimation, motion detection, obstacle avoidance and other functions, improve the autonomy and safety of the UAV, provide key data for the control and navigation of the UAV, so that the UAV can efficiently perform various tasks. The application of IMU will vary depending on the design and use of different types of UAVs, but whether it is fixed wing, multi-rotor or vertical take-off and landing and conversion UAVs, IMU is the core to achieve its flight control and navigation.

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What is a Tilt Sensor Used for?

 Tilt sensors are used in a variety of applications to measure angles. For example, high-precision laser instrument level, engineering machinery equipment leveling, long-distance ranging instruments, high-altitude platform safety protection, orientation satellite communication antenna elevation measurement, ship navigation attitude measurement, shield pipe application, dam detection, geological equipment tilt monitoring, artillery barrel initial launch angle measurement, radar vehicle platform detection, satellite communication vehicle attitude detection and so on.

Application example

Used in tower cranes

The inclination sensor is the main part of the anti-overturning monitoring instrument of tower crane. The function of the inclination sensor is to measure the angle of the tower tilt in real time. Since the tilt angle at the top of the tower is very small, the sampling frequency of the tilt sensor should be within the range of 0.5-10Hz, the measurement accuracy is higher than 0.05 degrees, and the noise caused by the vibration of the tower should be filtered out to ensure reliable communication and accurate judgment. The accuracy of the ER-TS-3160VO Voltage Single Axis Tilt Meter is 0.01 degrees, which is obviously higher than 0.05 degrees, and it is suitable for the tilt monitoring in this case.

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How to choose the right IMU?

Choosing the right product is not an easy task and we need to consider many aspects. Some of the aspects we have to consider when choosing an IMU are performance, underlying technology, SWaP (size, weight and power) and cost.

Additionally, another important factor for drones is the robustness of the IMU. In harsh drone applications, vibrations can reach very high levels and varying temperatures. Therefore, a drone’s IMU needs to be highly rugged to withstand harsh environments.

Advantages of having the right inertial measurement device

Rigorous applications such as drones require extremely stable and high-performance IMUs. An IMU with good performance, vibration robustness, and temperature stability will improve UAV flight operations. Accurate steering is easier to achieve even in high-vibration situations. In order to meet the requirements of UAV equipment, the ER-MG2-300/400 gyroscope placed in ER-MIM-02 not only adopts an advanced differential sensor design, it can eliminate the influence of linear acceleration and survive the impact in extremely harsh environments. It operates under vibration conditions and has a measurement range of 400 degrees/second and a deviation instability of 0.01°/hour. Able to measure angular velocity up to ±400°/s and has a digital output protocol compliant with Mode 3 SPI. Angular rate data is represented as 24-bit words. If you are interested in our products, please click the link below to learn more.

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What are the Three Types of Tilt Sensor?

 

There are many types of tilt sensors, but they can be classified into three broad categories.

1. Tilt sensors can be divided into two types: wireless and wired inclination sensors according to the way of data transmission.

1.1 Wireless inclinometers: Common wireless inclination sensors include NB-IoT wireless inclinometer sensors and LORO wireless inclinometer sensorss. These sensors transmit tilt signals via wireless communication technology without cable connections, making them highly flexible. The main advantages of wireless tilt sensors are their flexibility and convenience. Since no wiring is required, the sensor can be easily installed anywhere it is needed, without considering the laying of cables. In addition, wireless sensors also have the advantages of high mobility, easy expansion and maintenance. What is wireless transmission, for example, ER-TS-12200-Modbus is a wireless inclinometer sensors, it does not need to use traditional cables to transmit inclination signals, but uses lithium battery power supply, through Bluetooth and ZigBee wireless transmission of inclination data. This wireless digital signal transmission method eliminates the tedious wiring and noise interference caused by long cable transmission. However, wireless sensors also have some disadvantages, such as signal quality may be affected by radio interference, and signal stability and reliability may not be as good as wired sensors. Wireless inclinometer sensors can be widely used in bridge buildings, transmission tower/signal tower tilt, dangerous buildings, ancient buildings, warehouse shelves, smart town, smart lighthouse, fan tower tilt monitoring and other scenes.

1.2 Wired inclinometer sensors: It usually uses RS485 bus or other similar bus protocols to transmit inclination signals. RS485 is a serial communication protocol widely used in the field of industrial automation, which has the advantages of noise suppression and high signal quality. The main advantage of the wired inclinometer sensors is that the signal stability is high, and the signal quality is not easy to be disturbed because of the wired transmission mode. In addition, wired sensors have a long service life, lower maintenance costs, and a lower failure rate. However, this sensor also has some disadvantages, such as the need to lay cables, high requirements for the field environment, may exist in some application scenarios wiring difficulties. The wired inclinometer sensors can be widely used in buildings, Bridges, DAMS, shield pipe jacking, rail transit, high-rise buildings, slope monitoring and other scenarios.

2. According to different working principles, tilt sensors can be divided into static and dynamic inclinometer sensorss.

2.1 Static inclinometer sensors: It is mainly used to measure the static tilt Angle of objects, such as the tilt monitoring of Bridges, dangerous buildings, power towers and other structures. ER-TS-3160VO is a static inclination sensor, which can measure the tilt Angle of the object in the static state, and can be used to check the tilt Angle of Bridges, DAMS, and monitor the Angle of various construction machinery. It has the characteristics of small size, strong impact and vibration resistance.

2.2 Dynamic inclination sensor: It is suitable for measuring the tilt Angle of an object in a dynamic environment, such as dynamic balance control in the aerospace and automotive industries.

3.According to the different measurement range, the inclination sensor can be divided into single-axis, dual-axis and three-axis inclination sensors. A single-axis inclination sensor can only measure the tilt Angle of an object on one plane, a two-axis tilt sensor can simultaneously measure the tilt Angle of an object on two planes, and a three-axis tilt sensor can simultaneously measure the tilt Angle of three dimensions.

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How to choose an inertial measurement unit (IMU) for your drone application?

An inertial measurement unit (IMU) is an electronic device that uses accelerometers and gyroscopes to measure acceleration and rotation and can be used to provide position data.

IMUs are an important component of unmanned aerial systems (UAVs, UAS, and drones) and common applications include control and stabilization, guidance and correction, measurement and testing, and mobile mapping.

Raw measurements output from an IMU (angular rate, linear acceleration, and magnetic field strength) or AHRS (roll, pitch, and yaw) can be fed into devices such as an inertial navigation system (INS) to calculate relative position, direction, and speed to help UAV navigation and control.

There are many types of IMUs, some of which incorporate magnetometers to measure magnetic field strength, but the four main technology categories for drone applications are: silicon MEMS (microelectromechanical systems), quartz MEMS, FOG (fiber optic gyroscopes), and RLG (Ring Laser Gyroscope).

Silicon MEMS IMUs are based on tiny sensors that measure the deflection of a mass due to motion, or the force required to hold the mass in place. They typically have higher noise, vibration sensitivity, and instability parameters than FOG IMUs, but as technology continues to advance, MEMS-based IMUs are becoming more accurate.

MEMS IMUs are well suited for small UAV platforms and high-volume production units because they can often be manufactured at smaller size and weight and at lower cost.

The FOG IMU uses solid-state technology based on a beam of light propagated through a coiled optical fiber. They are less sensitive to shock and vibration and have excellent thermal stability, but are susceptible to magnetic field interference. They also offer high performance in important parameters such as angular random walk, bias offset error and bias instability, making them ideal for mission-critical UAV applications such as extremely precise navigation.

The higher bandwidth also makes the FOG IMU suitable for high-speed platforms and stable. They are larger and more expensive than MEMS-based IMUs and are typically used on large UAV platforms.

The RLG IMU uses a similar technical principle to the FOG IMU, but uses a sealed ring cavity instead of an optical fiber. They are generally considered the most accurate option, but are also the most expensive IMU technology and are often much larger than alternatives.

Quartz MEMS IMUs use a one-piece inertial sensing element micromachined from quartz, driven by an oscillator to vibrate at precise amplitudes. The vibrating quartz can then be used to sense angular rate, producing a signal that can be amplified and converted into a DC signal proportional to the angular rate. These factors make it ideal for inertial systems designed for space- and power-constrained UAV environments.

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Is Tilt Sensor an Accelerometer?

 

The tilt sensor is actually an application of the acceleration sensor.

Tilt sensors and accelerometers are different in concept, and inclination sensors are tools used to measure various angle changes. Acceleration sensor is a device that can measure acceleration force.

They work differently, and the theory behind inclination sensors is based on Newton's second law, which is actually the principle that accelerometers can measure acceleration at rest. For example, the ER-TS-12200-Modbus wireless tilt sensor can directly measure the carrier tilt angle when it is stationary, with ultra-low power consumption, small size, high performance and other characteristics, suitable for industrial sites, dangerous houses, ancient buildings, civil engineering, various tower tilt deformation and other needs for remote real-time monitoring and analysis. The accelerometer is composed of an upper capacitor, a middle capacitor plate (movable) and a lower capacitor plate. When the acceleration reaches a certain value, the middle capacitor plate will move, and the distance from the upper and lower capacitor plates will change, and the upper and lower capacitors will therefore change. The capacitance change is proportional to the acceleration. After the output voltage is digitally processed, the digital signal is output.

Their application scenarios are not the same, tilt sensor as a detection tool, it has become a bridge erection, railway laying, civil engineering, oil drilling, aviation and navigation, industrial automation, intelligent platform, machining and other fields of indispensable important measuring tools.

Accelerometers can be used in steel mast structures, bridges or building structures. It can also be used to protect hard drives from damage, as well as in medical and sports equipment, cameras and camcorders, smartphones, remote controls, controllers and navigation systems.

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What does Tilt Sensor do?

 Tilt sensor can be used in various scenarios where angle measurement is required. The tilt sensor, also known as level sensor, level meter and inclination meter, is a kind of angle sensor and an acceleration sensor based on the principle of inertia. It can judge the tilt state of the equipment by detecting the tilt angle in the use environment, and when the angle deviation of the monitoring object occurs, the angle of the equipment can be detected. Tilt sensors can communicate abnormal data to managers to avoid serious incidents.

The main application areas of tilt sensors are as follows:

1. Protection and monitoring of ancient buildings

Ancient architecture can inherit civilization and is a carrier of civilization. As time goes by, their lifespan will gradually shorten. In order to better maintain ancient buildings, extend their existence life, and monitor their safety performance, high-precision tilt sensors can be applied, which can sense the swing, vibration, tilt and other small angle changes of ancient buildings.

2. Dam monitoring

Dam collapse is prone to cause serious accidents. Tilt sensors can provide a variety of data basis for people to timely obtain the changes in dam and bedrock behavior and the role of the environment on the dam, and timely send early warning signals for people's travel safety, so that people can better predict the service life of the dam, improve and maintain it in time, and ensure the safe operation of the dam during use.

3. Bridge tower inclination measurement: After day after day of use, coupled with the impact of the surrounding environment, the bridge will gradually tilt, when tilted to a certain angle, it will collapse and break. Tilt sensors can monitor subtle changes in bridges in real time, generate trends, and help people analyze the safety of roads.

4. Drilling tilt control: In drilling construction, in order to ensure fast and efficient construction quality, higher requirements are put forward for controlling the verticality of the drill pipe, especially in the case of large drilling machinery, the deeper the depth means the higher the vertical requirements of the drill pipe, if there is a slight deviation on the way to drilling, there will be quality problems. The high precision inclination sensor can help people accurately measure and convert the angle deviation of drill pipe inclination to avoid the occurrence of drilling deviation.

For example, we can use the ER-TS-3160vo to monitor ancient building, dam, bridge bridge tower of angle, it can also help people accurately measure and convert the angle deviation of the drill pipe tilt to avoid the occurrence of the drilling rig deviation. It has the characteristics of small size, strong impact and vibration resistance, especially suitable for harsh industrial environments.

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