Abstract: 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.

Abstract: 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.

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.

Abstract: 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.

Abstract: There is provided a method and a system for collecting optical data for use in time resolved optical imaging wherein excitation light of a tunable wavelength is directionally propagated to impinge on a plurality of illumination points at the surface of a region of interest in a turbid media, comprising for example a biological tissue such as that comprised in small animals or in human organs. Light re-emitted with a different wavelength from a fluorescent marker present in the tissue is collected and directionally propagated towards a detector. A filter located in a path of the light rejects photons outside a fluorescence emission spectrum of the fluorescent marker while maintaining selectivity of the re-emitted light. The detector produces time resolved optical signals useful for optical image reconstructions.

Abstract: There is provided a method for improving contrast and resolution of an optical image of an object obtained by time-resolved techniques such as Time Domain (TD) and Frequency Domain (FD). The method comprises obtaining a Temporal Point Spread Function (TPSF), and determining optical properties of volumes of interest (VOI), each volume being defined by an ensemble of equiprobable effective photon paths corresponding to a time point or time gate of the TPSF.

Abstract: 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.

Abstract: There is provided a method for improving contrast and resolution of an optical image of an object obtained by time-resolved techniques such as Time Domain (TD) and Frequency Domain (FD). The method comprises obtaining a Temporal Point Spread Function (TPSF), and determining optical properties of volumes of interest (VOI), each volume being defined by an ensemble of equiprobable effective photon paths corresponding to a time point or time gate of the TPSF.

Abstract: The present invention relates to a method and a system for optical imaging of an object in transmission configuration. The method and system obtain contour coordinates of the object using source/detector configurations references and acquire optical data from a region of interest (ROI) of the object. Then, the method and system apply a weighting factor to said optical data as a function of the contour coordinates, and reconstruct an image of the ROI using the weighted optical data and photon diffusion equation.