The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2025
Filed:
May. 19, 2021
Applicant:
National Research Council of Canada, Ottawa, CA;
Inventors:
Assignee:
NATIONAL RESEARCH COUNCIL OF CANADA, Ottawa, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J 3/02 (2006.01); G01J 3/26 (2006.01); G01J 3/433 (2006.01); G01N 21/359 (2014.01);
U.S. Cl.
CPC ...
G01J 3/0218 (2013.01); G01J 3/0297 (2013.01); G01J 3/26 (2013.01); G01J 3/433 (2013.01); G01N 21/359 (2013.01);
Abstract
A method for detecting and identifying a remote gas, the method comprising the steps of: receiving a light wave associated with the remote gas; coupling the light wave into a single mode fibre; transmitting the light wave via the single mode fibre into a filter comprising a fibre-based tunable cavity; modulating the cavity length of the filter transmission window to cause a detected modulated signal that is proportional to the spectral feature; and processing the signal using a lock-in amplifier capable of low-pass filtering and out-of-frequency noise rejection.