System and method for video frame rate sound field visualization based on polarization parameter imaging

Abstract

The invention discloses a video frame rate sound field visualization system and method based on polarization parameter imaging. The system includes a laser, a polarization camera, a signal generator, a signal delayer, an oscilloscope, a power amplifier, a beam expander, a 4f imaging system, piezoelectric ceramics, and quartz glass. The method is: the signal generator outputs two signals, one of which is amplified by the power amplifier and triggers a PZT to generate an ultrasonic signal, and the ultrasonic signal detected by the other PZT is observed by the oscilloscope; the other is output to the signal delayer, and the signal delayer is set accurately The delay controls the laser output pulse laser and triggers the polarization camera to take the sound field image; the parallel beam output by the laser is expanded by the beam expander and passes through the quartz glass with ultrasonic propagation, and then imaged on the polarization camera through the 4f system, and the polarization algorithm is used to process the polarization camera to obtain The polarized image is used to obtain the azimuth image, and the sound field is calculated in real time and displayed on the computer. The invention has the advantages of high real-time performance, non-contact, large bandwidth and the like.

Description

technical field [0001] The invention belongs to the intersecting field of optics and ultrasound, in particular to a video frame rate sound field visualization system and method based on polarization parameter imaging. Background technique [0002] Ultrasonic testing technology forms the basis for various applications such as defect inspection of components, medical ultrasound diagnosis, photoacoustic tomography (PAT) of biomedical tissues, due to the strong penetration, good direction and safety of ultrasound in the above applications , ultrasonic detectors with broadband, small size, and high sensitivity are required for ultrasound visualization. Contact ultrasonic testing methods using ultrasonic transducers are usually limited by the detection bandwidth (centered on its resonant frequency) and spatial resolution. Therefore, more and more attention has been paid to non-contact optical ultrasonic detection methods capable of fast scanning and remote measurement, and overco...

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Problems solved by technology

However, photoelastic methods are easily affected by residual stress in the medium and are difficult to quantitatively evaluate ultrasonic pressure

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