Study on Infrared Gas-Filter Correlation Spectrometer for Measuring Low-Concentration Methanol Gases

摘要

A gas-filter correlation spectrometer that employed a wide spectral band of infrared radiation and gas-filter cell has been built and successfully tested to measure methanol concentrations up to 113 ppm. The instrument demonstrates a detection limit of approximately 1.0 ppm. The interference of nonmethanol gases is negligible when automobile exhausts are used for the test. The most prominent, though not serious, problem appears to be the signal drift, which is believed to be improved by thermally insulating the instrument. The analyzer demonstrated its capability for real-time analysis of emissions from methanol-fueled vehicles due to its simplicity and fast response as compared with wet chemical methods. (Copyright (c) 1986 Society of Photo-Optical Instrumentation Engineers.)