Interferometric range finder

Details Interferometric range finder Interferometric range finder

1988-03-22

1990-05-29

Willis, Davis L.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356358, G01B 902

Patent

active

049290770

ABSTRACT:
In a range finder for measuring absolute distances, a time partially coherent light source is provided. A beam emitted by it is split into a reference beam (B), which passes along a reference path, and a testing or measuring beam (A), which can be focused onto a testpiece (4). The radiation (A') reflected by the testpiece is brought to interference with the reference beam (B). In a position-sensitive detector array, the testing and reference beam are superimposed. The coherence of the two waves is directly determined from the intensity distribution on the detector array. The distance of the test-piece is calculated from the intensity distribution on the detector. Preferably, upstream of the detector array is connected an optical grating (6) with a grating spacing at least approximately corresponding to the spacing of the interference fringes on the detector array. The instrument makes it possible to perform approximate measurements and in direct change measurements with maximum precision within a very short time, without any changes or conversions having to be carried out on the measuring means. (FIG. 1).

REFERENCES:
patent: 4589772 (1986-05-01), Patteu et al.
Medovikov et al., "Use of Semiconductor Lasers in Geodesic Interference Measurements of Distances", Sov. J. Quat. Elec., vol. 9, No. 11, pp. 1459-1460, 11/79.
VDI Berichte 548 (1985), pp. 35-36.
M. Alonso, E. J. Finn, "Fundamental University Physics", vol. II, Addison-Wesley Reading, 1973, pp. 860-863.
Gerthsen, Knesver, Vogel, "Physik", Springer 1974, 12th edition, pp. 596-597.
Y. Vaisala, "Uber die Langenmessung mit Hilfe der Lichtinterferenz", zeitschrift fur Instrumentenkunde, Aug. 17, 1927, pp. 398-402.

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