G - Physics – 01 – S
Patent
G - Physics
01
S
325/1, 354/55
G01S 17/06 (2006.01) G01D 18/00 (2006.01) G01V 8/10 (2006.01) G01S 7/487 (2006.01) G01S 7/493 (2006.01)
Patent
CA 1340975
Visual detection of objects submerged in water, e.g. mines, is difficult because of reflection of light from particulate matters etc. within the water as well as from the surface of the water. Polarization processing is not very effective at removing sea surface glare. The present invention provides an electro-optical detection system capable of improved detection of submerged objects. The system comprises a device to receive electro-magnetic radiation, apparatus for separating the received radiation into two spectral channels, detectors responsive to electro-magnetic radiation and located to receive radiation in the respective channels, and a signal processor connected to the output of the detector. The processor comprises a signal channel wherein the wavelength and bandwidth of the signal channel are optimised to correspond to the peak of transmission of the medium and to give a high signal to noise ratio, a reference channel wherein the wavelength and bandwidth are selected to correspond to a spectral region where attenuation in the medium is high but which is close to the signal wavelengths thereby ensuring that reflected light at both signal and reference wavelengths are of similar intensity and geometric distribution, and a subtractor wherein the signal and reference channels are subtracted so as to remove the effect of reflected light.
599370
Fetherstonhaugh & Co.
Qinetiq Limited
Sutton Philip
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