Absolute interferometer measuring process and apparatus having a

Details Absolute interferometer measuring process and apparatus having a Absolute interferometer measuring process and apparatus having a

1996-03-12

1997-05-20

Gonzalez, Frank

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, G01B 902, G01B 1102

Patent

active

056317360

ABSTRACT:
An absolute measuring interferometer having a measuring interferometer, a tunable laser emitting a laser beam and a control interferometer for adjusting the air wavelength of the laser beam. The control interferometer adjusts the air wavelength of the laser beam to a specific wavelength value at the ends of each measuring cycle. The wavelength of the tunable laser is continually tuned within the specific wavelength interval where the phase change of the interference signal is continually detected during the wavelength modulation process. An absolute measurement is determined by a simple mathematical relationship between the measured wavelength and phase changes.

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Schussler, H. "Comparison and Calibration of Laser Interferometer Systems," Measurement, vol. 3, No. 4, Oct.-Dec. 1985, pp. 175-184.

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