Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1986-04-17
1988-03-22
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
356351, G01B 902, G01J 345
Patent
active
047324805
ABSTRACT:
Interferometric device for the detection and/or analysis of gas, of the type comprising an optical assembly forming the image of a light source on the sensitive element of the detector, comprising a photoelastic modulator comprising a silica or fluorine plate associated to a piezoelectric ceramic to vibrate in order to give the plate a birefringency variable by compression, having an axis parallel to that of a birefringent plate and an interferential filter constituted by a grating multiplexer device; and having application to the interferometric detection of gas through high-sensitivity.
REFERENCES:
patent: 2823577 (1958-02-01), Machler
patent: 3216313 (1965-11-01), Chisholm
patent: 3849001 (1974-11-01), Inoue et al.
patent: 4285596 (1981-08-01), Landa
patent: 4320973 (1982-03-01), Fortunato et al.
patent: 4480916 (1984-11-01), Bareket et al.
LaGrande Encyclopedie, "Interferences" by Gerard Fortunato, Librairie Larousse 1974, vol. 11, pp. 6387 and 6389.
Born and Wolf, Principle of Optics, 1980, p. 143.
Journal of the Optical Society of America, "Piezo-Optical Birefrigence Modulators: New Use of a Long-Known Effect", vol. 59, No. 8, part 1, Aug. 1969, pp. 950-954.
Journal of Optics, "Application de la Correlation Interferentielle de Spectres a la Detection de Polluants Atmospheriques", vol. 9, No. 5, 1978, pp. 281-290.
Optical Engineering, "The Slective Modulation Interferometric Spectrometer", vol. 17, No. 1, Jan./Feb. 1978, pp. 73-81.
Fortunato Gerard
Laurent Dominique
ELF France
Koren Matthew W.
Willis Davis L.
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