METHOD AND APPARATUS FOR DETECTING GASES, PARTICLES AND/OR LIQUIDS Russian patent published in 2012 - IPC G01N21/39 

FIELD: physics.

SUBSTANCE: invention is based on using a four-component tunable laser operating in the middle part of the infrared range to simultaneously measure particles and a gas. Measurement is carried out in space where the gas of interest absorbs radiation in the middle part of the infrared radiation. Methane gas reduces radiation intensity at the defined wavelength of the device, while particles/mist reduce intensity of all wavelengths. In this case, mist does not trigger an alarm signal while detection of methane does.

EFFECT: owing to broad tuning of the emitted wavelength of the laser, certain wavelengths may be measured to more accurately determine both composition of a gas and concentration of particles using one sensor based on use of a laser.

42 cl, 11 dwg