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:
Jul. 19, 2022
Filed:
Mar. 02, 2018
Boreal Laser Inc., Edmonton, CA;
John Tulip, Edmonton, CA;
Boreal Laser Inc., Edmonton, CA;
Abstract
A method of suppressing retroreflector fringe noise in TDL spectrometers (TDLS) that use a laser and retroreflector. The path between the laser and each retroreflector element is changed mechanically for example by using a movable support for the retroreflector. The phase of light reaching the retroreflectors is very sensitive to the pathlength. A pathlength change of a fraction of the light wavelength will significantly change the phase of the light. In this method the pathlength to each retroreflector is modulated by mechanical means and this modulation is both stronger and faster than atmospheric effects on phase. If mechanical modulation occurs at a sufficiently high frequency retroreflector fringe noise can be averaged by integration of the spectrometer output over a reading period of typically one second.