Method and apparatus for simultaneously measuring a plurality of

Details Method and apparatus for simultaneously measuring a plurality of Method and apparatus for simultaneously measuring a plurality of

1989-06-15

1990-02-27

Lall, Parshotam S.

Boots, shoes, and leggings

356327, 356346, 356365, G01J 400, G01B 902

Patent

active

049051695

ABSTRACT:
An apparatus and method simultaneously measures a plurality of spectral wavelengths present in electromagnetic radiation. A modulatable birefringent optical element is employed to divide a polarized light beam into two components, thereby producing a phase difference in two resulting light beams such that the two beams can be made to interfere with one another when recombined, the interference pattern providing the wavelength information required for the analysis of the incident light. The interferometer thus created performs in a similar manner to a Michelson interferometer, but with no moving parts, and with a resolution dependent on the degree of phase shift introduced by the modulator.

REFERENCES:
patent: 4086652 (1978-04-01), Martz
patent: 4138827 (1979-02-01), Martz
patent: 4162851 (1979-07-01), Wada
patent: 4173442 (1979-11-01), Snyder
patent: 4548500 (1985-10-01), Wyatt et al.
Bouchareine et al., "Interferential Wavelengths Comparison . . . ," SPIE vol. 210 2nd European Congress on Optics Applied to Metrology, 1979, pp. 48-53.
D. H. Martin et al., "Polarised Interferometric Spectrometry for the Millimetre and Submillimetre Spectrum," Infrared Phys. 10, 105-109, Dec. 1969.
Lawrence A. Mafie et al., "Differential Absorption at High Modulation Frequencies Using a Fourier Transform Infrared Spectrometer," Multiplex and/or High Throughput Spectroscopy, SPIE 191, 56-63 (1979).

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