US 2017/0059469 A1 · GAS SENSOR

Abstract

We describe a method of selectively detecting the presence of an analyte. The method comprises providing a waveguide with a core comprising porous material; absorbing an analyte sample into the porous material of the core such that the analyte sample is held within pores of the core; waveguiding radiation along the waveguide to an output; measuring spectral features of the output radiation due to absorption or scattering of said waveguided radiation by the absorbed analyte sample; and selectively identifying the presence of a target analyte in the sample from the spectral features. In embodiments spectral features are measured for multiple different waveguide core regions having different physical/chemical properties modified to provide additional selectivity to the target analyte(s), and these measurements are combined to identify the target analyte.

Claims21

Dependent claims

A method of selectively detecting the presence of an analyte, the method comprising:

providing at least one waveguide, the waveguide having a core comprising porous material;
absorbing an analyte sample into said porous material of said core such that said analyte sample is held within pores of said core;
waveguiding radiation along said at least one waveguide to an output to provide output radiation;
measuring one or more spectral features of said absorbed analyte sample in said output radiation due to absorption or scattering of said waveguided radiation by said absorbed analyte sample;
selectively identifying the presence of a target analyte in said analyte sample from said one or more spectral features;
wherein molecular absorption or Raman spectroscopy is performed on said analyte sample.

3 more elements

Dependencies are inferred from the claim text.

Gas sensor

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Gas sensor

Life of this patent

Abstract

Claims21