Fujian Institute of Metrology Research and Development of Automatic Verification Device for Sound Wave Detector

[ Instrument R & D of Instrument Network ] Acoustic wave is the propagation form of the mechanical vibration state (or energy) of an object. The so-called vibration refers to the reciprocating motion of the material particle near its equilibrium position. The ultrasonic vibration frequency is more than 20KHz, which exceeds the upper limit of human hearing (20000Hz). People call this inaudible sound wave as ultrasonic. It usually propagates in an elastic medium in the form of longitudinal waves. It is a form of energy propagation. It is characterized by high ultrasound frequency and short wavelength. It has good beam and directivity when propagating in a straight line within a certain distance.

It is reported that the sonic wave detector verification device for high-tech measurement products independently developed by the Fujian Provincial Institute of Metrology Research has won a utility model patent (patent number: ZL 2013 2 0241485.4)

This device is mainly composed of a computer, a sound time calibration device for an acoustic wave detector, an arbitrary waveform generator, a precision variable attenuator, a measuring hydrophone, a digital oscilloscope, and a muffler temperature gauge.

In addition, the system uses virtual instrument technology, according to "JJG990-2004 Sound Wave Tester Verification Regulations", to meet the verification / calibration needs of the sound wave tester. And realize the following functions:

First, the relative error (electrical signal), relative error (acoustic signal), and amplitude measurement can be carried out on non-metallic ultrasonic detectors such as Beijing Zhibolian ZBL series, Beijing Concory NM, Wuhan Yanhai RS, etc. Level linearity, transmit voltage stability, receiving system frequency range, channel isolation and other verification items; secondly, after the measurement is completed, you can choose to automatically export verification records in EXCELL table format.