Patent ID: 9638628
Date: 2017-05-02
CPC Classifications: G01N

Claim:
1. A system comprising: a variable light filter configured to filter different wavelengths of incident light at different locations along a length of the variable light filter to form filtered light, the variable light filter configured to be disposed between a light source generating plural different wavelengths of the incident light and a gas sample; and a light detector configured to determine an intensity of one or more wavelengths of the filtered light after the incident light generated by the light source passes through the variable light filter and the gas sample, the light detector also configured to identify the gas sample from among different potential gasses based on the intensity of the one or more wavelengths of the filtered light that is determined by the light detector; wherein the variable light filter has different thickness dimensions as a function of the length along the variable light filter, the thickness dimensions measured between an incident side of the variable light filter where the incident light is received and a filtered side of the variable light filter where the filtered light leaves the variable light filter, and wherein the variable light filter is configured to be disposed at an angle with respect to the light detector, the angle being based on the different thickness dimensions.