Gas identification by measuring stain development at multiple specific wavelength regions with narrow band optical sensors

A gas detector device comprising:

• a light sensor array comprising a plurality of narrow band light sensors, wherein each narrow band light sensor of the plurality of narrow band light sensors is configured to detect light at a different range of wavelengths;
• a wide band light emitting diode (LED) configured to direct wide band light onto a color changing stain strip, wherein the wide band light comprises a range of wavelengths that spans the different wavelengths detected by all of the plurality of narrow band light sensors,
• wherein the plurality of narrow band light sensors of the light sensor array are configured to detect the wide band light as reflected by the color changing stain strip, wherein a darkness of a color of the color changing stain strip changes according to a concentration of a detected gas, and wherein an intensity of the wide band light as reflected by the color changing stain strip changes according to the darkness of the color of the color changing stain strip;
• and
• a processor in communication with at least two narrow band light sensors of the plurality of narrow band light sensors, the processor being configured to:
• receive, from the at least two narrow band light sensors, wavelength information about the wide band light, as reflected by the color changing stain strip and detected by the at least two narrow band light sensors, and
• determine the concentration of the detected gas based at least upon the intensity of the wide band light, as reflected light from the color changing stain strip.