Patent ID: 11927529
Assignee: CSIR
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. One or more non-transitory computer-readable storage media storing instructions that, when executed by one or more processors, cause:
radiating, by an illuminator device, photons at a predetermined wavelength, at or around an absorption wavelength of a predetermined target gas selected for detection, towards a scene under observation in a strobed fashion at a predetermined strobing frequency such that photons at the predetermined wavelength are radiated to the scene under observation, and photons at the predetermined wavelength are not radiated to the scene under observation in an alternating fashion according to the predetermined strobing frequency;
acquiring, by an infrared camera arrangement, infrared images from the scene under observation at a predetermined frame rate, wherein the predetermined frame rate is associated with the predetermined strobing frequency such that active infrared images are acquired while photons at the predetermined wavelength are radiated to the scene under observation, and passive infrared images are acquired while photons at the predetermined wavelength are not radiated to the scene under observation in an alternating fashion at the predetermined frame rate;
storing, by a data storage device of a processor arrangement, at least one prior infrared image acquired from the scene under observation during a prior state of the illuminator device, wherein the at least one prior infrared image is either an active infrared image or a passive infrared image,
comparing, by at least one processor of the processor arrangement, at least one current infrared image, acquired during a current state of the illuminator device that is different from the prior state, with the stored at least one prior infrared image, wherein the at least one current infrared image is either a passive infrared image or an active infrared image;
generating, by the at least one processor of the processor arrangement, an output signal in response to said comparison, wherein the output signal is representative of an amount of illuminator photon flux absorbed by the predetermined target gas; and
displaying, by a display device of the processor arrangement, an output image on a display device based at least on the generated output signal so as to facilitate detection of the predetermined target gas.