FLAME PHOTOMETRIC DETECTOR USING AN OPTICAL LIQUID CRYSTAL SHUTTER

摘要

PURPOSE: A photometric flame detector using optics liquid crystal shutter is provided to improve effectiveness of detection by simultaneously analyze two wavelengths. CONSTITUTION: A photometric flame detector using optics liquid crystal shutter comprises a first band pass filter(121), a second band pass filter(123), a photo multiplier(110) and an optics liquid crystal shutter(115). The first band pass filter passes through the wavelength corresponding to the first sample. The second band pass filter passes through the wavelength corresponding to the second sample. The first band pass filter and the second band pass filter locate in the same direction. The optics liquid crystal shutter is installed in front of two band passing filters.