Fluorescence Fiber-optical Gas Instrumentfor Measuring Sulfur Diode Concentration

摘要

Sulfur dioxide is an important pollution source of air. It is a poisonous gas which distributes in a big area and influences a wide range. Detecting sulfur diode and its concentration in time has a very important for prevention of air pollution and protect ecological balance. As one kind of gas concentration fiber-optical sensing technology, fluorescence analysis method has virtues such as high sensitivity and non-contacted online measurement in measuring gas concentration. It has some superiority in the field of environment gas monitoring. Sulfur dioxide has fluorescence characteristic that it can give out fluorescence in the stimulating of the short wavelength light. So it can be detected by fluorescence analysis method. Based on the fluorescence characteristic of sulfur dioxide, a fluorescence fiber-optical gas instrument monitoring its concentration is developed. Adopting the xenon lamp driven by 10Hz pulse as stimulating illuminant and using the technology of fiber-optical sensing and PINPD, the instrument can deal with the online measurement to the sulfur dioxide concentration. Meantime, changed some parameters, such as center wavelength of the filter, the instrument can else measure some other gas concentration. This study provides an effective method and means for gas measurement with fluorescence feature. Using PINPD as spectrum detecting component, adopting fluorescence signal processing methods such as signal filtering, this instrument has made marked progress in sensitivity, linear degree and signal-to-noise ratio.