Piezoelectric sound wave array sensor signal testing system

Abstract

The invention discloses a piezoelectric sound wave array sensor signal testing system. According to the system, a main control chip FPGA (field programmable gate array) controls a reference signal generator to generate high-precision sinusoidal signals, and the sinusoidal signals are resolved into two paths of identical signals by a power divider after being subjected to links of filtering, amplitude stabilization, power regulation and the like, wherein one path of signals enter a multipath gating controller for controlling testing signals to excite time division of each sensor in piezoelectric sound wave sensor arrays, and the other path of signals excite a reference sensor; two paths of signals simultaneously enter a signal demodulation unit, the demodulation unit outputs amplitudes and phase comparison results of two paths of signals, and the results are transmitted to a high-speed A / D (analog to digital) unit; the FPGA maintains the control and the monitoring on the multipath gating controller and an A / D converter, frequency difference testing results are output to an upper computer after the operation, and in addition, the upper computer outputs results according to a calibration relationship.

Description

technical field [0001] The invention relates to the field of electronics testing and signal processing technology, in particular to a piezoelectric acoustic wave array sensor signal testing system. Background technique [0002] The piezoelectric acoustic wave sensor utilizes the piezoelectric effect of the piezoelectric material and the transmission characteristics of the acoustic wave signal in the sensor to realize the measurement of the physical quantity. The frequency characteristics of the sensor are significantly different under different environments, achieving high detection sensitivity. The principle and process of using piezoelectric acoustic wave sensors for detection are as follows: [0003] Determining the Characteristic Frequency of Sensors by Frequency Sweeping Method ,exist The amplitude-frequency characteristic curve has a maximum value, and the phase value displayed by the phase-frequency characteristic curve is . [0004] by Select the approp...

AI Technical Summary

Problems solved by technology

On the one hand, the application of a large number of piezoelectric acoustic wave sensors is still in the laboratory stage, and the large-scale test equipment used is not portable enough to meet the needs of on-site testing; on the other hand, the piezoelectric acoustic wave sensor test system put into use has a low test throughput. , The defect of slow speed, a single device can only realize a single detection at a time, which cannot meet the testing requirements of piezoelectric acoustic wave array sensors

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