Apparatus and method for measuring absolute measurements having

Details Apparatus and method for measuring absolute measurements having Apparatus and method for measuring absolute measurements having

1994-05-02

1996-05-28

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356358, G01B 902, G01B 1102

Patent

active

055217044

ABSTRACT:
An apparatus and method for measuring absolute measurements having two measuring interferometers and a tunable laser emitting a laser beam. The two measuring interometers each have their own measuring lines and are supplied with the beam from one and the same laser. A reference line is established from the arithmetic sum or difference of the two measuring lines and is maintained at a constant value.

REFERENCES:
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patent: 4596466 (1986-06-01), Ulrich
patent: 4813783 (1989-03-01), Torge
patent: 4974961 (1990-12-01), Jackson et al.
patent: 4984898 (1991-01-01), Hofler et al.
patent: 5189677 (1993-02-01), Yry
patent: 5301010 (1994-04-01), Jones et al.

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