Morgan Schaffer Ltd.

Other

Softscan Healthcare Group Ltd.

Niculae Mincu

Stephan Brauer

Stefan Voinea

Samuel René De Cotret

Andrew MacGillivray

Nicholas Lebel-Buchanan

Frederic Leblond

Guobin Ma

Dao Chao Huang

Salim Djerizi

Mario Khayat

Salim Djeziri

Alexandre Beaudoin

Olga Guilman

Andrew Macgillivray

Xavier Intes

Samuel Rene De Cotret

Marilyse Piche

A self-calibrating dissolved gas analysis apparatus and associated method are described. The dissolved gas analysis apparatus includes an analyser having an optical absorption measurement system using one or more electromagnetic energy sources to obtain optical absorption measurements associated with a gas sample. An observed response of the optical absorption measurement system is derived at least in part by using the optical absorption measurement system to obtain optical absorption measurements for a reference gas under one or more distinct moisture conditions. The derived observed response is then processed to quantify deviations between the derived observed response and an expected response and the quantified deviations are used to compensate information associated with gas concentration measurements derived by the dissolved gas analysis apparatus.

Apparatus and method for performing calibration of a dissolved gas analysis system using optical absorption spectroscopy and use thereof in an apparatus and method for performing dissolved gas analysis (DGA) on a piece of electrical equipment

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.

Apparatus and method for performing dissolved gas analysis on a piece of electrical equipment using resonant photo-acoustic spectroscopy and use thereof

A co-registration system provides a means for spatially warping an optical image of an object with another images of a similar object. The optical image may be a scatter image, and the second image may be the same type of image modality, or may be different. The co-registration may use landmarks selected by a user, or may make use of contour information derived from the images. The system may also include processing of three-dimensional volume data in the form of sets of two-dimensional slices for co-registration.

Registration of optical images of turbid media

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Pointe-Claire, Canada

Niculae Mincu