Air coupling acoustic emission sensor

• Main Authors: WANG HONGYU, LONG ZHENYU, LEI LIANG
• Format: Patent
• Language: Chinese; English
• Published: 26.07.2024
• Subjects: FOR PERFORMING MECHANICAL WORK IN GENERAL; GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY; PERFORMING OPERATIONS; PHYSICS; TESTING; TRANSPORTING

The invention belongs to the technical field of acoustic emission sensors, and particularly relates to an air-coupled acoustic emission sensor, which is characterized in that a receiver, a piezoelectric transduction device and a coaxial cable are arranged in a matched manner, so that internal stress waves of a material enter the sensor from air through a receiving hole in the receiver; a piezoelectric film of the piezoelectric transduction device vibrates, so that the surfaces of an upper electrode and a lower electrode generate polarization proportional to the surface of the piezoelectric film, charges are generated, an array transducer converts the charges into analog quantity electric signals, and the analog quantity electric signals are output from a shielding cable to a coaxial cable through an electrode plate to form analog signal output of the sensor; according to the design that the impedance matching layer surrounds the array type transducer, the influence of external interference on sensor signal co