Volume : IV, Issue : IV, April - 2014

Sound Speed Measurement using Photoacoustic Effect

Mustafa M. A. Hussein

Abstract :

A simple experiment is presented to show the photoacoustic effect, a well established but not widely known effect which has many applications. The photoacoustic effect consists of the generation of acoustic waves by pulsed radiation incident on a sample. In the present case, the Nd:YAG laser is used as a source of pulsed light for different samples in order to measure the speed of sound. The Nd:YAG laser is emitting nanosecond pulses in the infrared region of the spectrum (λ = 1064 nm). The acoustic waves generated on the surface of the samples travel through the material and are detected with a piezoelectric sensor. The electric signals are registered by a 100 MHz oscilloscope triggered by the light produced at the laser discharge. Knowing the thickness of the sample and the arrival time of the acoustic wave we can precisely measure the speed of sound.

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Mustafa M. A. Hussein Sound speed measurement using photoacoustic effect Indian Journal of Applied Research, Vol.IV, Issue. IV

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