Piezoelectric sensor self-checking excitation reflection offset circuit and self-checking method

• Main Authors: CHEN XUEYING, ZOU BOHAO, JIANG ZHAOXIANG, HAN XIMING, CHEN ZUYANG, HE PAN, PANG TIANFENG, LIU CAIXUE, HU JIANRONG
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2024
• Subjects: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; PHYSICS; TESTING

The invention relates to the technical field of equipment testing, and provides a self-test excitation reflection offset circuit and a self-test method for a piezoelectric sensor, the self-test excitation reflection offset circuit is used for performing excitation detection on the piezoelectric sensor, the self-test excitation reflection offset circuit comprises an excitation signal generator, a signal analyzer and a hybrid circuit module, the hybrid circuit module comprises an impedance matching unit and a signal offset unit, the excitation signal generator generates an excitation signal and transmits the excitation signal to the piezoelectric sensor and the signal analyzer through the hybrid circuit module, the impedance matching unit is used for changing an impedance value at an interface of the piezoelectric sensor, so that the signal counteracting unit eliminates the excitation signal received by the signal analyzer, and the piezoelectric sensor generates a feedback signal in response to the excitation s