Features of Quartz Flexible Accelerometer

 

With the development of low-cost inertial systems, a new type of non-liquid floating so-called dry accelerometer began to appear in the mid-1960s. Because this instrument uses flexible support technology, it is called quartz flexible accelerometer, and its structure and process are greatly simplified. This kind of quartz flexible accelerometer has been widely used in various modern inertial systems.

Quartz flexible accelerometer with high precision, high stability, high temperature, small size and so on, is the physical sensitive measurement control products, including acceleration, speed, distance, swing, vibration, tilt, etc. According to these characteristics are used for inertial navigation and guidance.

So what are the features of thequartz flexible accelerometer?

1. The flexible strut is made of whole quartz material, without hysteresis, friction, elastic aftereffect, aging and deterioration not affected by temperature

2. It does not require temperature control to match the properties of the quartz material with the low expansion alloy.

3. It is not affected by temperature change by using the gas film damping

4. The signal is insulated from the shell so that the work does not cause influence and interference.

5. The torque device is used as magnetic steel for the push-pull of the torque device. Therefore, the magnetic stability and the torque rate are large, the time constant is small, and the thermal stability is good.

6. The differential capacitive sensor has a good shielding method because of its small size and high sensitivity

7. The design of servo circuit is advanced, integrated and reliable

8. The power level constant current output can change the sampling resistance to adjust the scale factor in the larger range

9. A large amount of adhesive technology has good reliability and environmental resistance, so it has high requirements for adhesive materials and adhesion process

10. In the servo circuit, the double voltage power supply, the triangular wave transmitter and the various terminal terminals are used for self-check, offset compensation and calibration, so it is convenient to use.

The quartz flexible accelerometer uses high-quality quartz crystals to achieve high precision acceleration measurement with extremely high reliability and stability. Its special flexible construction enables it to adapt to high acceleration applications under various environmental conditions, such as high temperature, high pressure and high vibration environments. For example, High Performance Quartz Accelerometer ER-QA-03 A bias repeatability :10-50ug, scale coefficient repeatability :15-50ppm, Class II nonlinear repeatability :10-30μg/g2, and can work at -45°C~85°C environment.

In addition to being widely used in aerospace and military fields, quartz flexible accelerometers are also widely used in automotive, medical and scientific research fields. In the automotive sector, they can help automakers improve the performance and safety of their vehicles while improving their fuel efficiency. In the medical field, quartz flexible accelerometers can be used to monitor and diagnose human movement and physiological processes. In the field of scientific research, they can be used to study earthquakes, crustal movements, cosmology, and microgravity environments.

Installation Method and use of Tilt Sensor

 

The tilt sensor is a kind of attitude angle sensor, which is mainly used in the level detection of the state of the object, and it also has the measurement of the angle. Front inclination sensors are mainly divided into several categories, there are single-axis tilt sensor and dual-axis tilt sensor, and the use of tilt sensor principle made of tilt meter.

The selection of inclination sensor is relatively concise for the sensor, as far as the dual-axis inclination sensor is concerned, it has many characteristics, and the product is only the measurement of a small angle, and in the same environment

They have different personalities. When choosing the inclination sensor, we must first of all according to your measurement environment, the harsh environment and size requirements must consider whether to use the protection of the shell. Secondly, the measurement accuracy and range of the inclination sensor are considered, in general, the biaxial inclination sensor can be selected in 360 degrees, and the measurement accuracy and output are based on the data value. When choosing an inclination sensor, it is important to pay attention to the environmental problems you use, which will affect the measurement effectiveness of most inclination sensors in different environments, and even some inclination sensors will lose their effect in a certain environment.

ER-TS-12200-Modbus Tilt sensor installation is a certain skill, the general tilt sensor will have a built-in zero adjustment, the user can customize the zero adjustment button according to the requirements, so as to realize the current set of angle zero performance. Before the installation of the inclination sensor, it is necessary to determine your installation position and what angle you need to measure is relative to which plane, for example, in the relative angle of a plane, the installation only needs to fix the sensor in a certain plane, and the zero button is used to achieve zero clearing performance before measurement, so that the main character is convenient to read the angle and reduce the unnecessary error.

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Current status and development trends of MEMS IMU

The MEMS sensor market is expanding rapidly, and MEMS technology is changing with each passing day. As the demand for MEMS sensors continues to grow, new innovative MEMS sensors will emerge and drive market growth. MEMS IMU has changed the development trend of the sensor industry with its small size, low power consumption, and high precision. It is manufactured using micromachining technology and can mass-produce small and complex devices. Its market is growing rapidly and is expected to reach US$21.145 billion by 2031, with a compound annual growth rate of 6.85% from 2023 to 2031. Can be used in multiple industries, such as oil logging, aerospace, drones, mining, surveying, etc., even in the fields of autonomous driving and medical care. In the field of oil logging, in the aerospace field, MEMS IMU is used in navigation systems, flight control systems and environmental control systems. In the mining and surveying world, MEMS IMUs are used in mining equipment and surveying vehicles. In the automotive field, MEMS IMUs are used in airbag deployment systems, anti-lock braking systems and tire pressure monitoring systems. Additionally, MEMS IMUs can be used in implantable medical devices, drug delivery systems, robotics, and more.

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What Is IMU On Drone？

When it comes to flying a drone, it's crucial to understand the complex technology that powers it. An important component that plays a vital role in the stability and performance of a drone is the Inertial Measurement Unit (IMU). The IMU is a critical sensor system that provides critical information to a drone’s flight controller, allowing it to maintain stability, maneuver effectively, and perform a variety of flight maneuvers.

As drone technology continues to advance, the need for precise flight control becomes even more important. The IMU acts as the “brain” of the drone, constantly monitoring and adjusting its position, orientation and movement. By utilizing a combination of sensors such as accelerometers, gyroscopes, and magnetometers, the IMU can accurately measure the drone's acceleration, rotation rate, and magnetic field. This data is then processed by the flight controller to make real-time adjustments and maintain stable flight.

What is an IMU?

The Inertial Measurement Unit (IMU) is an important component of DJI drones, responsible for collecting and providing basic data about the drone's movement and orientation. It is essentially a combination of sensors that work together to capture and measure various parameters of the drone’s movement.

IMUs consist of three main types of sensors: accelerometers, gyroscopes, and magnetometers. Accelerometers measure linear acceleration, allowing the drone to determine the speed and direction of its movement. Gyroscopes, on the other hand, measure angular velocity, providing information about the drone's rotation and orientation in three-dimensional space. Finally, the magnetometer detects the strength and direction of the Earth's magnetic field, helping the drone determine its compass heading.

By collecting data from these sensors, the IMU provides vital information to the flight controller, which is essentially the “brain” of the drone. The flight controller uses this data to make real-time adjustments to the drone's motors, ensuring stability, control and precise navigation.

It is worth noting that IMUs have become increasingly complex in recent years due to technological advances. DJI drones are equipped with high-performance IMUs that provide precise and reliable measurements for responsive flight control in a variety of conditions.

In summary, the IMU on a drone is a complex system of sensors that work together to provide data about the drone's movement and orientation. By utilizing accelerometers, gyroscopes and magnetometers, the IMU ensures stability, control and accuracy of flight.

The importance of IMU for drones

The IMU on a drone plays a vital role in ensuring stable flight and precise control. Without a functioning IMU, drone performance may be affected, resulting in erratic flight behavior and potential safety hazards. Let’s explore the key reasons why an IMU is crucial for DJI drones.

1. Enhance stability: The IMU continuously collects data on the movement, direction and position of the drone. The flight controller then uses this data to make on-the-fly adjustments to the drone's motors and stabilize its flight. By proactively monitoring and correcting deviations, the IMU helps maintain stable and smooth flight, even in challenging weather conditions or turbulent airspace.

2. Precise navigation: Knowing the exact location and direction of the drone is crucial for safe navigation. The IMU provides the flight controller with precise measurements of acceleration, rotation, and magnetic fields, allowing the drone to accurately determine its position relative to its starting point. This enables drones to navigate with precision, follow flight plans and perform complex maneuvers with confidence.

3. Sensitive control: A well-calibrated IMU ensures that the flight control receives accurate data about the drone's attitude, angular velocity and acceleration. This information enables the drone to respond quickly and accurately to the pilot's commands, allowing for smooth and controlled movement. Whether capturing cinematic footage or executing precise flight paths, the role of the IMU in mobility cannot be overstated.

4. Fault detection and redundancy: DJI drones use advanced IMU systems and use redundancy measures to improve reliability. In the event of sensor malfunction or malfunction, redundant sensors in the IMU can compensate for the loss, ensuring critical flight data remains available. This redundancy feature adds an extra layer of safety, as any potential issues with one sensor can be mitigated by other sensors in the IMU system.

Overall, the IMU is an important part of the UAV, providing important data for stable flight, precise navigation, response control and fault detection. It's an integral part of your drone's safety and performance system, ensuring pilots of all skill levels have a smooth, enjoyable flight experience.If you want to know more about imu's products, please click the link below to contact us, and we will have professional personnel connect with you.

 

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Application of Tilt Sensor in the Settlement of Railway Track Subgrade

 

The tilt sensor can be well applied in the remote automatic monitoring system of subgrade settlement.

In order to ensure the high-speed and healthy development of railway, the remote automatic monitoring system of subgrade settlement based on laser measurement, advanced sensing and wireless network technology is developed. The monitoring system includes four sub-systems: automatic measurement of surface settlement by laser, simultaneous automatic measurement of subgrade stratified settlement and lateral displacement, automatic measurement of subgrade lateral profile settlement, data acquisition and wireless transmission. Automatic measurement of surface settlement is achieved by laser measurement and automatic calibration technology: simultaneous automatic measurement of subgrade stratified settlement and lateral displacement is achieved by Hall sensor, laser ranging and dip angle transmission sensor realization: The automatic measurement of subgrade transverse profile settlement is achieved by the tilt sensor driven by the main and slave motors. The monitoring system has been verified by laboratory and designed by engineering, and has been tested in a station of high-speed railway.

The ER-TS-12200-Modbus tilt sensor can be well applied in the control system, so as to realize real-time monitoring of the overall settlement of the subgrade, local settlement and the settlement of different layers in the section, and transmit the output signal of the tilt sensor to the computer through wireless transmission or various wired networks. Then the received data is processed, analyzed and stored by computer software.

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The Working Principle of the Three Axis Accelerometer

 The three-axis acceleration sensor is used to measure the spatial acceleration sensor in the acceleration sensor, that is, to measure the speed change of the object in space. There is no difference in the measurement principle between the three-axis acceleration sensor and the single-axis and two-axis acceleration sensor. The main difference between them is that the measurement dimensions are different. The three-axis acceleration sensor is mainly to decompose the spatial acceleration in X, Y, and Z three axes, and three single axes can be turned into a three-axis in a certain technology.

The current three axis acceleration sensors mostly use piezoresistive, piezoelectric and capacitive working principles. The acceleration produced is proportional to the change of resistance, voltage and capacitance, and is collected through the corresponding amplifying and filtering circuit. This and the normal acceleration sensor is based on the same principle, so in a certain technique three single axes can be turned into a three axis. For most sensor applications, the two axis accelerometer has been able to meet most applications. But some applications still focus on three axis accelerometer, for example, in data acquisition equipment, valuables monitoring, collision monitoring, building vibration measurement, wind turbines, wind turbines and other sensitive large structure vibration.

Three axis accelerometer, as a basic component of inertial navigation system, is widely used in aviation field. Signal transmission between system and controller, processor and memory is mainly carried out through space bus. As a standard specification for the development of space systems, Space Wire can improve the transmission rate of accelerometers and enhance the stability of the transmission.

Application of three-axis acceleration sensor:

Automotive Electronics:

In the case of the body safety system, when the body is hit, the impact sensor sends a signal to the electronic controller within a few microseconds. Then the electronic controller will immediately calculate and make corresponding assessment according to the intensity of the collision, the number of passengers and the position of the seat/seat belt and other parameters, with the data returned by the sensors distributed throughout the carriage, and in the shortest time through the electric explosion drive to activate the airbag to ensure the safety of passengers.

Impact protection for portable devices:

Portable devices, due to their application, often fall or collide unexpectedly, resulting in a huge impact on the internal components. When a drop occurs, the system detects a sudden change in acceleration and performs self-protective actions, such as turning off electrical or mechanical devices with poor seismic performance to prevent damage, or damaging the hard disk head or scratching the platter, which could result in permanent data loss.

Satellite navigation:

When entering an area or environment with poor reception of satellite signals, the navigation function will be lost due to loss of signal. A 3-axis acceleration sensor based on MEMS technology, combined with components such as a gyroscope or an electronic compass, can create a bearing reckoning system that is complementary to the GPS system.
Virtual Reality:

For example, AR/VR, game console controller, etc., through wearing or handheld game equipment, controller, sensor synchronous sensing human acceleration, according to the acceleration analysis of the human body’s action, and then on the game screen synchronously show the corresponding game action, some motion sensing games can even achieve the same exercise effect as outdoor sports.

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High Precision IMU Application in UAV

As the key technology of UAV, navigation technology plays an important role in the research and commercial application of UAV. Navigation technology plays a role in the whole process of take-off, navigation and landing of UAV, ensuring the safety of UAV flight. Therefore, the research of navigation technology is the focus of UAV research field.

The IMU (Inertial Measurement Unit) is a sensor module that integrates a three-axis accelerometer and a three-axis gyroscope to measure the linear acceleration and angular velocity of an object. In the UAV, IMU plays an important role, it can provide accurate attitude and movement information, providing key data for the control and navigation of the UAV. The main role of the IMU is to help the drone maintain balance and attitude. The UAV will be affected by external factors in flight, such as wind speed, gravity, etc., which will cause the attitude of the UAV to change. By measuring the acceleration and angular velocity of the UAV in real time, the IMU can accurately identify the attitude change of the UAV, thus helping the UAV maintain balance. 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 to improve the autonomy and safety of UAV. For more accurate stability, ER-MIMU-01 uses high-quality and reliable MEMS accelerometers and gyroscopes with bias instability up to 0.02 degrees/hour. Weighs only 70 grams.

The application of IMU in UAV is extensive and important. It provides critical data for drone control and navigation, enabling the drone to perform a variety of tasks efficiently. The application of IMU will vary depending on the design and use of different types of UAV.

Fixed-wing Drone: These drones are designed like traditional aircraft, with Fixed wings and tail fins. It is usually used for long-duration flight and large-scale reconnaissance missions, with high speed and flight stability. IMU is used for attitude control and flight stability maintenance in fixed-wing UAVs

Multi-rotor Drone: This type of drone provides lift and handling through multiple rotors, most commonly four – and six-rotor. The multi-rotor UAV has vertical takeoff and landing and hovering capabilities, which is suitable for close-range reconnaissance, aerial photography and logistics distribution tasks. Imus are used in multi-rotor UAVs for attitude control, flight stability and precise positioning.

Vertical Takeoff and Landing Transition Drone: This drone has a variable flight mode that can switch between vertical takeoff and landing and horizontal flight. It combines the advantages of fixed-wing UAVs and multi-rotor UAVs and is suitable for missions requiring long duration flight and flexible maneuvering. Imus play a key role in VTOL and transition UAVs for flight mode conversion and attitude control.

Inertial navigation system (INS) detecting acceleration and rotation motion of high frequency (1 KHZ) sensor, the inertial sensor data processing after the displacement and rotation of the vehicle can drawn real-time information. INS have bias and noise problems affect the outcome. By using a sensor fusion technique based on kalman filtering, we can be the integration of GPS and inertial sensor data, from each director, in order to achieve better location performance. Attention because of the unmanned for reliability and security requirement is very high, so based on GPS and inertial sensor positioning is not the only way of positioning in the unmanned, we also use LiDAR point cloud and high precision map matching, and locating methods such as visual mileage calculation method for various positioning method to correct each other to achieve more accurate results.

 

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