| abstract |
A liquid crystal gas analyzer comprises a liquid crystal film, a means for illuminating the film, a phototransistor for detecting the intensity of the light reflected from the film and a means to cause a gas to contact the film. Once the liquid crystal is subjected to the gas to be analyzed, the two diodes are pulsed and the phototransistor detects the intensity of the light reflected from the crystals. Since the crystals exhibit a different optical response for different concentrations of the same gas, the concentration of the gas which the liquid crystals have been subjected to can be determined. |