公开(公告)号：US20220018771A1

公开(公告)日：2022-01-20

申请号：US16931474

申请日：2020-07-17

Applicant: INSTITUT NATIONAL D'OPTIQUE

Inventor： François BABIN ,  Jean-François GRAVEL ,  Pascal DUFOUR

IPC: G01N21/64 ,  G01N21/65 ,  G01N33/00

Abstract: There is described a method for detecting a given gas species present in a gaseous sample. The method generally has splitting a primary optical pulse into first and second optical pulses, the primary optical pulse having a duration and carrying optical power within an excitation spectrum encompassing at least one absorption spectral band of the given gas species, the first optical pulse being propagated across an optical gas filter unit containing an amount of the given gas species and attenuating the first optical pulse at the at least one absorption band, one of i) the primary optical pulse and ii) the first and second optical pulses being propagated across the gaseous sample, and temporally delaying the first and second optical pulses from one another; measuring signal values of the delayed optical pulses; and detecting the presence of the given gas species in the gaseous sample based on the signal values.

公开(公告)号：US20180052100A1

公开(公告)日：2018-02-22

申请号：US15679359

申请日：2017-08-17

Applicant: INSTITUT NATIONAL D'OPTIQUE

Inventor： François BABIN ,  Jean-François GRAVEL ,  Pascal DUFOUR

IPC: G01N21/33 ,  G01N21/65

CPC classification number: G01N21/33 ,  G01J3/44 ,  G01M3/18 ,  G01M3/38 ,  G01N21/65 ,  G01N21/94 ,  G01N2021/1797 ,  G01N2201/0214

Abstract: The method of determining the presence of a spill of a petroleum product by the detection of a petroleum-derived volatile organic compound (VOC) generally has a step of providing an ultraviolet (UV) radiation generator and a receiver assembly aimed at a scene; a step of illuminating a distant target in the scene with a UV radiation beam, the UV radiation beam having an excitation wavelength being tuned to a resonance Raman excitation wavelength of the petroleum derived VOC; a step of receiving a return signal from the distant target; and a step of determining the presence of the petroleum-derived VOC upon detecting Raman scattering in the received return signal, the Raman scattering being indicative of a resonance Raman interaction between the UV radiation beam and molecules of the petroleum-derived VOC.