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. 30, 2019
Filed:
Nov. 15, 2017
Morgan Schaffer Ltd., LaSalle, CA;
Alexandre Beaudoin, Montréal, CA;
Stephan Brauer, Montréal, CA;
Nicholas Lebel-Buchanan, Montréal, CA;
Andrew MacGillivray, Montréal, CA;
Niculae Mincu, Pointe-Claire, CA;
Samuel René de Cotret, Montréal, CA;
Stefan Voinea, Brossard, CA;
Morgan Schaffer Ltd., Quebec, CA;
Abstract
An apparatus is described for performing dissolved gas analysis on electrical equipment having components immersed in electrical insulating liquid. The apparatus comprises an analyzer including a photo-acoustic spectroscopy (PAS) measurement system for performing gas analysis on a gas sample wherein the PAS measurement system has an elongated channel including a resonant cavity and an electromagnetic energy source. The resonant cavity includes a first portion and a second portion configured for containing at least part of the gas sample, wherein the first portion defines an optical pathway configured for propagation of electromagnetic energy from the electromagnetic energy source. The resonant cavity includes an element configured for obstructing the propagation of the electromagnetic energy through to the second portion of the resonant cavity. The PAS measurement system is configured to excite a portion of the gas sample in the optical pathway to produce a photo-acoustic signal, which may then be processed to derive information associated with dissolved gas concentrations in the electrical insulating liquid. In some implementations, a pressure regulating element may be used to regulate the pressure in a gas extraction cell so that the pressure lies within a target pressure range. In some implementations, the electromagnetic energy source may be configured to produce a periodically pulsed beam of electromagnetic radiation having a chopping frequency greater than or equal to 150 Hz. One or more damper elements may be used for reducing vibrational interferences with some of the measurement equipment.