Laser heterodyne method of shift measurement using acousto-optic interaction
Heterodyne methods of optical-field detection using acousto-optic interaction (AOI) have gained use in optical and acoustical holography, optical interferometry and interference microscopy, and ultrasonics. These methods detect the amplitude and phase at each point of the optical field at a given carrier frequency and, in conjunction with scanning, recover the wave fronts scattered by an object. This paper examines another heterodyne method of acoustooptic conversion of light-wave phase shift in which AOI is accomplished at the output of the interference system. The described method allows a differential scheme for conversion of light-wave phase shifts which increases stability and doubles sensitivity. This is a two-channel system and has an electrical reference signal that is formed by acousto-optic conversion in transillumination of the point of the acoustic grating as the measuring signal. The proposed method has provided a basis for designing and putting into serial production laser meters with displacement ranges of up to 10 m and up to 30 m and with discreteness to 0.01 micrometers.
- OSTI ID:
- 5567356
- Journal Information:
- Meas. Tech. (Engl. Transl.); (United States), Journal Name: Meas. Tech. (Engl. Transl.); (United States) Vol. 27:11; ISSN MSTCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
ACOUSTICS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FILTERS
FOURIER TRANSFORMATION
FREQUENCY CONVERTERS
GRATINGS
HETERODYNE RECEIVERS
INTEGRAL TRANSFORMATIONS
INTERFEROMETERS
LASER RADIATION
LASERS
LIGHT TRANSMISSION
MACH-ZEHNDER INTERFEROMETER
MEASURING INSTRUMENTS
MICHELSON INTERFEROMETER
MICROWAVE EQUIPMENT
OPTICAL FILTERS
PHASE SHIFT
RADIATIONS
RADIO EQUIPMENT
SENSITIVITY
SOUND WAVES
TRANSFORMATIONS
VISIBLE RADIATION