The invention discloses a device and a method for measuring the sensitivity of an air coupling ultrasonic probe. The method comprises the following steps of receiving a broadband pulse signal by usingan air coupling transducer to evaluate the frequency spectrum of the broadband pulse signal; and measuring a short sound signal with known vibration displacement by using an air coupling transducer so as to calibrate the sensitivity amplitude of the short sound signal. The influence of transmitter sensitivity, input pulse, attenuation and diffraction is considered, and the precision of the calibrated sensitivity is improved; in addition, the sensitivity amplitude is determined by comparing the measured displacements, so that complex tasks for describing the influence of electrical equipment are avoided.

Device and method for measuring sensitivity of air coupling ultrasonic probe

The invention discloses a non-linear pulse reflection measurement device and a calibration device and method for a probe in the device. The method comprises the steps of firstly obtaining a standard transfer function through a conventional self-reciprocity-based probe calibration mode, selecting another probe for transmitting a signal based on the standard transfer function, and measuring the output current of the calibrated probe under different circuit connections so as to correct the influence of the circuit impedance on the probe transfer function. The result of a water absolute nonlinearcoefficient measurement experiment shows that accurate measurement can be realized after the influence of the impedance of the electronic equipment on a transfer function when the probe is used as a receiver is corrected, and the method plays a role in promoting and referencing the development of a piezoelectric receiving probe inspection technology and the design and construction of a pulse reflection nonlinear measurement system.

Non-linear pulse reflection measurement device and calibration device and method for probe in device

The invention discloses a measurement method and measurement apparatus for an ultrasonic attenuation system. The measurement method includes the following steps: transmitting, by using an ultrasonic water immersion probe whose surface is immersed in water, an ultrasonic signal to a test block immersed in the water, wherein the ultrasonic signal is an ultrasonic narrowband pulse sine wave signal; receiving, by using the ultrasonic water immersion probe, an echo signal of the ultrasonic signal reflected by the test block; and calculating an ultrasonic attenuation coefficient of the test block according to frequencies of the echo signal and the ultrasonic signal. In the measurement method, the ultrasonic narrow pulse sine wave signal with a corresponding frequency value is transmitted to thetest block by using the ultrasonic water immersion probe, and the ultrasonic attenuation coefficient of the test block at this frequency is measured, causing the measured ultrasonic attenuation coefficient to be more accurate.

Measurement method and measurement apparatus for ultrasonic attenuation system

The invention discloses a method and device for checking ultrasonic water immersion piezoelectric probe The method comprises the steps of carrying out connection on a pulse generator and an externalresistor, and measuring an input current signal; separating the pulse generator and the external resistor, carrying out connection on the pulse generator and a probe, and measuring an output current signal flowing through the probe; obtaining an acoustic propagation function, acoustic radiation impedance, a resistance value of the external resistor and the resistance value of the pulse generator;and multiplying the output current signal by resistance value sum of the external resistor and the pulse generator to obtain a first product, carrying out multiplication on the input current signal, the acoustic propagation function and the acoustic radiation impedance to obtain a second product, dividing the second product by the first product and then solving a square root, thereby obtaining sensitivity of the probe According to the technical scheme provided by the invention, the sensitivity of the probe can be measured only by measuring the current signal, a test process is simplified, andthe problem that impedance is mismatched in a conventional circuit is solved

Zhang Shuzeng

Papers

Method and device for checking ultrasonic water immersion piezoelectric probe