A device and method for non-contact sensing of...

Details A device and method for non-contact sensing of... A device and method for non-contact sensing of...

G - Physics

01

N

G01N 21/47 (2006.01) G01N 15/06 (2006.01) G01N 21/21 (2006.01) G01N 21/41 (2006.01) G01N 21/63 (2006.01)

Patent

CA 2468924

A device and method for non-contact (remote, standoff or in-situ) detection of chemical substances at low-concentrations or traces such as vapours of solid-phase or liquid materials, natural and anthropogenic atmospheric constituents, minor gaseous infrastructural leaks and industrial by-products, such as hazardous agents, hydro- and fluorocarbons, and others, the method is using a combination of two fundamental processes: a) inducing changes in the vapour refractive index, in particular, thermooptic effect in weakly absorbing substances, using spectrally selective light sharply resonant with absorption spectral lines) of the sensed substance; and b) detecting the induced changes with laser beams (pulsed or CW) using coherent coupling of laser beams with orthogonal polarizations.

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