G - Physics – 01 – N
Patent
G - Physics
01
N
73/55, 340/140.1
G01N 21/88 (2006.01) G01J 3/453 (2006.01) G01N 21/39 (2006.01) G01N 21/35 (2006.01)
Patent
CA 1237177
ABSTRACT (Figure 4) A remote sensor for detecting gas, vapour 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 sensitised 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 centre frequency band-pass optical filter.
476359
Fetherstonhaugh & Co.
The Secretary Of State For Defence In Her Britannic Majesty's Go
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