Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1996-08-08
1998-07-14
Font, Frank G.
Optics: measuring and testing
By particle light scattering
With photocell detection
356358, G01B 902
Patent
active
057812950
ABSTRACT:
An interferometer for absolute distance measurement with two lasers, one of which is tunable with respect to frequency. A device for collinear superposition of the laser beams is arranged downstream of the lasers. Further, interferometer units are provided whose optical path lengths differ from one another. An individual acousto-optical modulator (AOM) is arranged downstream of the device for superposing the beams. Light-conducting elements for guiding the beams are arranged between the AOM, between the AOM and at least one first beam splitter arranged downstream of the AOM, and between the light outputs of the first beam splitter and the light inputs of one or more interferometer units arranged downstream and/or within these interferometer units.
REFERENCES:
patent: 4688940 (1987-08-01), Sommargren et al.
patent: 4907886 (1990-03-01), Dandliker
patent: 5274436 (1993-12-01), Chaney
patent: 5404222 (1995-04-01), Lis
Bechstein Karl-Heinz
Fuchs Werner
Salewski Klaus Dieter
Wolfram Andreas
Carl Zeiss Jena GmbH
Font Frank G.
Merlino Amanda
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