Apparatus and method for remote sensing of gases, vapors or aero

Details Apparatus and method for remote sensing of gases, vapors or aero Apparatus and method for remote sensing of gases, vapors or aero

1985-03-06

1987-06-30

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356353, G01J 345, G01B 902

Patent

active

046766421

ABSTRACT:
A remote sensor for detecting gas, vapor or aerosol comprises means to measure the change in temporal coherence of light of a selected narrow waveband when it interacts with the gas etc. The light can be provided by a laser source or spectrally filtered sun light etc. Received radiation is split in to two beams by a Fresnel biprism and then detected by a detector sensitized by a modulating reticle to interference fringes. A glass delay plate of suitable thickness is placed in the path of one of the beams such that only received radiation having a temporal coherence greater than a minimum determined by the plate thickness produces an output signal from detector. The minimum temporal coherence is set higher than the temporal coherence of the illuminating radiation. In alternative arrangements a band-pass temporal coherence filter may be used and the sensor can be made to spectrally scan the field of view by using a tunable laser or a variable center frequency band-pass optical filter.

REFERENCES:
patent: 3549260 (1970-12-01), Barringer
patent: 3563663 (1971-02-01), Barringer
patent: 3914055 (1975-10-01), Wolga et al.
patent: 4035643 (1977-07-01), Barrett
"Digital Speckle-Pattern Shearing Interferometry", Nakadate et al., Applied Optics, 12-1980, pp. 4241-4246.
"Image-Shearing Camera for Direct Measurement of Surface Strains", Hung et al., Applied Optics, 4-1979, pp. 1046-1051.
"Simultaneous Measurement of Three Displacement Derivatives Using a Multiple Image-Shearing Interferometric Camera", Hung et al., Journal of Strain Analysis, 7-1979, pp. 81-88.

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