Signal conditioning system for improving low-frequency measurement performance of acceleration sensor

Abstract

The invention relates to a signal conditioning system for improving the low-frequency measurement performance of an acceleration sensor. The signal conditioning system comprises a charge integration circuit, a high-pass filter circuit, a lead-lag network, an anti-aliasing filter circuit and a gain adjustment circuit. The input end of the charge integration circuit is connected with the acceleration sensor; the output end of the charge integration circuit is connected with the input end of the high-pass filter circuit; wherein the output end of the high-pass filter circuit is connected with theinput end of the lead-lag network, the output end of the lead-lag network is connected with the input end of the anti-aliasing filter circuit, and the output end of the anti-aliasing filter circuit is connected with the input end of the gain adjustment circuit. The low-frequency vibration control effect of an active vibration reduction system is improved, and then accurate measurement of vibration by the sensor is achieved.

Description

technical field [0001] The invention relates to the field of active vibration control, in particular to a signal conditioning system for improving the low-frequency measurement performance of an acceleration sensor. Background technique [0002] In the field of active vibration reduction, the realization of active vibration control depends on the accurate measurement of vibration by sensors, so the ability of sensors to measure vibration directly affects the performance of active vibration control. Piezoelectric acceleration sensors are widely used in active vibration reduction applications because of their wide frequency measurement range, light weight, large measuring range, shock resistance, and durability. [0003] Inside the piezoelectric acceleration sensor, the structure of the spring mass system and the material properties of the piezoelectric material are used to measure the vibration acceleration. The core mass inside the sensor is affected by the vibration accele...

AI Technical Summary

Problems solved by technology

However, the amplitude response of the piezoelectric acceleration sensor exhibits the characteristics of amplitude attenuation at low frequencies. When the frequency of the input signal is lower than the cut-off frequency of the sensor at low frequencies, the signal will rapidly attenuate, and the amplitude of the low-frequency signal is small. When the circuit samples the low-frequency signal, it will generate large quantization noise, and the signal-to-noise ratio of the low-frequency signal is poor. This problem will lead to the deterioration of the vibration control effect of the active vibration reduction system at low frequencies.

Images