What Is The Principle Of high-Precision Quartz Accelerometer

The yoke is composed of soft magnetic materials with low temperature coefficient and good magnetic permeability. The magnetic steel is processed with a grinder using permanent magnetic materials with good magnetic permeability.

The material of the flexible sheet is quartz glass with excellent temperature performance, and the shape is made by ultrasonic processing. The processing of the flexible element generally adopts the chemical etching method, or the reactive ion etching process can also be used to process the entire flexible sheet, but the cost is very high.

The amount of differential capacitance change caused by acceleration is detected by the differential capacitance detector in the servo circuit, and its output is the current, which becomes the output voltage through the current integrator and then the voltage is converted into the output current by the trans conductance compensation amplifier. It is proportional to the input acceleration.

The quartz flexible acceleration sensor is a single-axis torque feedback accelerometer, which detects the acceleration signal of the outside world through the detection quality, and then is demodulated and amplified by the servo circuit, and finally the output current signal is proportional to the acceleration signal.

Features:

The performance index of the quartz flexible acceleration sensor has high measurement accuracy, good repeatability, high reliability, small size, light weight, wide voltage and low power consumption.The ER-QA-03B range quartz accelerometer has a measuring range of ±70g, bias stability ≤±3mg, scale factor 0.8~ 1.5mA /g, diameter 25.4X30mm and weight ≤80g, so it can be used not only for aerospace inertial testing, but also for static and dynamic acceleration measurement. In addition, the accelerometer uses a temperature sensor that the operator can use to compensate for the bias and scale factor parameters to reduce the impact of the temperature factor.

Signal processing method of quartz accelerometer

The signal processing method of quartz accelerometer usually includes three steps: filtering, amplifying and digitization.
Filtering is to remove the noise in the signal and retain the main components of the acceleration signal. The commonly used filtering methods include low-pass filtering, band-pass filtering and high-pass filtering.

Amplification is to increase the amplitude of the signal so that the signal can be processed normally by subsequent circuits. The amplifier is usually an operational amplifier, and the gain can be selected according to the need.

Digitization is the conversion of analog signals to digital signals in order to facilitate subsequent digital signal processing. Digitization is usually achieved through an analog-to-digital converter (ADC), which discretizes an analog signal into a series of digital samples.

Applications:

The use of high-quality quartz crystals enables 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. The navigation guidance system of missiles, aircraft, ships, combat vehicles, etc., must have speed and position information.As the performance requirements of weapon systems increase, a linear accelerometer can be installed in a moving object to directly measure its acceleration, thereby obtaining speed and position. Its measurement accuracy is high and its dynamic performance is good. It is far better than air speedometer and odometer. Much better.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.

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