Remote sensing system

Details Remote sensing system Remote sensing system

G - Physics

01

N

G01N 21/25 (2006.01) G01N 21/31 (2006.01) G01N 21/39 (2006.01) G01N 21/35 (2006.01)

Patent

CA 2057143

Case 7663/7902(2) ABSTRACT OF THE DISCLOSURE REMOTE SENSING SYSTEM Apparatus for use in a moving airborne platform for detecting a target gas in the atmosphere comprises a tunable laser source, preferably a pulsed laser source, comprising a solid state laser connected to at least two tunable laser diodes for generating at least two tunable laser beams in the infra red region of the spectrum. At least one beam is tunable to the resonance frequency of the target gas and at least one beam is tunable to an off-resonance frequency of the target gas. Means are provided for directing the beams through the atmosphere to be analysed to a land or sea reflecting surface in such manner that the beams are transmitted coaxially. The beams are of such wavelengths that the on-resonance beam is attenuated by the presence of the target gas, if present in the atmosphere, and the off-resonance beam is not attenuated by the target gas. Means are provided for collecting the reflected laser radiation of wavelength absorbed by the target gas and reflected laser radiation of wavelength unabsorbed by the target gas and for generating a differential signal; determined by the difference in returning energies between the reflected laser radiation of wavelength absorbed by the target gas and the reflected laser radiation of wavelength unabsorbed by the target gas.

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