Measurement of Sound Speed utilizing Photoacoustic Impact

A basic trial is exhibited to demonstrate the photoacoustic impact, a settled however not broadly known impact which has numerous applications. The photoacoustic impact comprises of the era of acoustic waves by beat radiation episode on a specimen. In the present case, the NdYAG laser is utilized as a wellspring of beat light for various tests keeping in mind the end goal to gauge the speed of sound. The NdYAG laser is emanating nanosecond beats in the infrared district of the range ( = 1064 nm). The acoustic waves produced on the surface of the examples go through the material and are recognized with a piezoelectric sensor. The electric signs are enrolled by a 100 MHz oscilloscope activated by the light delivered at the laser release. Knowing the thickness of the example and the landing time of the acoustic wave we can definitely measure the speed of sound.