Quartz Flexible Accelerometers Introduction

Quartz flexible accelerometer mainly has three important parts: quartz pendulum component, capacitive sensor, and servo control system. According to Newton's second law of motion, according to the force balance system, the force on the quartz pendulum plate is calculated, and the acceleration of the moving carrier is obtained by combining the mass of the pendulum plate.

Quartz flexible accelerometer is a precision instrument composed of quartz flexible support and an advanced circuit according to the principle of inertia. The quartz flexible accelerometer has high output impedance, and the user can select the required sampling resistance according to the situation without affecting the system stability. At present, quartz flexible accelerometers have formed a series of products, the product types range from high-precision ug-level accelerometers to harsh-environment accelerometers and high-temperature accelerometers for oil drilling, and the working temperature can reach 185 °C. Provide inertial acceleration signals for navigation, guidance, control, leveling, monitoring, etc. of various systems.

As a kind of force feedback pendulum accelerometer, the quartz flexible pendulum accelerometer is developed on the basis of the liquid floating accelerometer. The main difference between the two is that the detection mass of the quartz flexible accelerometer is not floating, but elastically connected to the flexible beam support, introducing elastic moment, so this accelerometer has higher accuracy, strong anti-interference ability, large measurement range and strong overload capacity. The performance of the flexible material directly affects the performance of the accelerometer. The materials that can be used as flexible pendulums are mainly metal and quartz. The traditional liquid-floating accelerometer pendulum uses metal materials, while the thermal expansion coefficient of quartz is much smaller than that of steel, and the material performance is better than that of metal. Moreover, quartz has high fatigue resistance, and the material itself has small hysteresis, which is very suitable for the pendulum plate of the accelerometer. As soon as the flexible Quartz accelerometer came out, it quickly replaced the liquid-floating accelerometer and became an indispensable key component in the inertial navigation and guidance system. At present, quartz flexible pendulum accelerometers have been widely used in the measurement of various linear acceleration and vibration acceleration, and the measurement of parameters such as speed, distance, angular velocity, and angular displacement. It has been successfully used in satellite microgravity measurement systems, high-precision inertial navigation systems, geotechnical foundation drilling measurement, oil drilling, continuous inclination measurement system, launch vehicle, ballistic missile, spacecraft, and other military and civilian fields.