METHOD FOR LASER PROBING OF GREENHOUSE GASES IN ATMOSPHERE Russian patent published in 2024 - IPC G01S17/88 

FIELD: measuring.

SUBSTANCE: invention relates to atmospheric observation and probing of greenhouse gases and can be used to measure concentration of water vapour and methane in the atmosphere. Method consists in directing radiation of a continuous narrow-band tunable diode laser through a fibre-optic path and a collimator into the atmosphere along a horizontal path in the direction of a topographic target, reception of the optical signal backscattered from the topographic target to the receiving aperture of the Newton telescope with input into the fibre-optic channel and conversion of the optical signal into an electrical signal with registration at the sensitive area of the photodetector. At that, the wavelength of the probing radiation of the narrow-band laser diode is modulated by the control system in the spectral range from the water vapour absorption line to the methane absorption line by changing the laser diode current according to the periodic law (sinusoidal, triangular, sawtooth shape), and demodulation of the received signal according to a given law provides registration of a continuous absorption spectrum in the range of probing the target gases.

EFFECT: reconstructing integral values of water vapour and methane concentrations from recorded echo signals in the spectral range of probing target greenhouse gases.

1 cl, 2 dwg