Title :
Laser diode interferometer for vibration and sound pressure measurements
Author :
Takahashi, H. ; Masuda, C. ; Gotoh, Y. ; Koyama, J.
Author_Institution :
Dept. of Electron., Shibaura Inst. of Technol., Tokyo, Japan
fDate :
4/1/1989 12:00:00 AM
Abstract :
A laser-diode interferometer for vibration measurement was constructed using two acoustooptical tunable filters (AOTFS) with slightly different frequencies of the diffracted light. A sound pressure measurement of a condenser microphone using a combination of a polarization-maintaining fiber and the laser-diode interferometer was demonstrated. The advantages of this interferometer are the ability to use various laser beams in the 0.4-1.2-μm wavelength region by varying only the acoustic frequency of the OTF, and the ability to use remote measuring equipment for the sound pressure by using a polarization-maintaining fiber
Keywords :
acoustic variables measurement; acousto-optical devices; filters; light diffraction; light interferometers; measurement by laser beam; semiconductor junction lasers; telemetering equipment; vibration measurement; 0.4 to 1.2 micron; acoustic frequency; acoustic intensity measurement; acoustooptical tunable filters; condenser microphone; diffracted light; laser-diode interferometer; polarization-maintaining fiber; remote measuring equipment; sound pressure measurements; vibration measurement; Diode lasers; Fiber lasers; Filters; Frequency; Optical fiber devices; Optical fiber polarization; Optical interferometry; Pressure measurement; Tunable circuits and devices; Vibration measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
