Laser interferometers - Opto-electronic yardsticks with microinch resolution

Details Laser interferometers - Opto-electronic yardsticks with microinch resolution Laser interferometers - Opto-electronic yardsticks with microinch resolution

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mades..47...92k&link_type=abstract

Machine Design, vol. 47, Feb. 20, 1975, p. 92-97.

Physics

Optics

2

Displacement Measurement, Electro-Optics, High Resolution, Interferometers, Lasers, Optical Measuring Instruments, Adaptive Control, Error Analysis, Instrument Errors, Numerical Control, Optical Paths, Refractivity

Scientific paper

The optical system and operation of a two-frequency ac laser interferometer (ACLI) are explained. Advantages of the ACLI over conventional transducers include high repeatability and resolution of displacement measurement, high accuracy, and long-range optical path. Possible sources of error include variation in the index of refraction of air, cosine error, machine geometry, and light-beam disturbances. The use of an ACLI as a transducer in numerical and adaptive control is discussed.

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