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Gas-coupled laser acoustic detection at ultrasonic and audio frequencies
1998
Review of Scientific Instruments
Airborne acoustic waves have been detected by a laser-beam deflection technique in both the ultrasonic and audio frequency ranges. For ultrasonic applications, a probe beam is directed parallel to the surface of a sample. Ultrasonic waves in the solid are detected when an acoustic wave is radiated from the surface into the ambient air, where the density variations cause a beam deflection. Gas-coupled laser acoustic detection ͑GCLAD͒ has been used to record well-resolved through-transmission and
doi:10.1063/1.1149033
fatcat:5zn4nyd6czfdtgcpndfimcszfe