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

Claim 0:
1. A system for detecting a predetermined target gas in a scene under observation, wherein the system comprises:
an infrared camera arrangement configured to acquire infrared images of the scene under observation at a predetermined frame rate;
an illuminator device configured to radiate photons at a predetermined wavelength, at or around an absorption wavelength of the predetermined target gas selected for detection, to the scene under observation, wherein the illuminator device is strobed at a predetermined strobing frequency between an ON state in which photons at the predetermined wavelength are radiated to the scene under observation, and an OFF state in which photons of the predetermined wavelength are not radiated to the scene under observation, and wherein the strobing frequency of the illuminator device is associated with the predetermined frame rate of the infrared camera arrangement such that active infrared images are acquired by the infrared camera arrangement during the ON state of the illuminator device and passive infrared images are acquired by the infrared camera arrangement during the OFF state of the illuminator device in an alternating fashion at the predetermined frame rate;
a processing arrangement, wherein the processing arrangement comprises:
a data storage device configured to store at least one prior infrared image acquired by the infrared camera arrangement during a prior state of the illuminator device, wherein the prior infrared image is either an active infrared image or a passive infrared image; and
at least one processor configured to compare at least one current infrared image, acquired by the infrared camera arrangement during a current state of the illuminator device that is different from the prior state, with the at least one prior infrared image stored in the data storage device and generate an output signal in response to said comparison, wherein the current infrared image is either a passive infrared image or an active infrared image, wherein the output signal is representative of an amount of illuminator photon flux absorbed by the predetermined target gas; and
a display device configured to display an output image based at least on the output signal generated by the processing arrangement so as to facilitate detection of the predetermined target gas, in use.