| Sulfur hexa fluor ide(SF6) gas has been w idely used in large power equip ment as a kind of excelle nt insulat ing gas and SF6 gas detection has been the necessary steps to guarantee the safe operat ion of the power syste m. Photoacoust ic spectroscopy techno logy is w idely used in t he fie ld of gas detection because of its large dyna mic range, high sensit ivit y, good select ivity and other prominent advantages. In this paper, SF6 gas detectio n is researched based on photoacoustic spectroscopy aimed at the shortcomings o f the current SF6 gas detection techno logies.The theories of p hotoacoustic spectroscopy are d iscussed in detail, includ ing the gas absorption spectroscopy theory,photonic absorptio n,heat production and the generatio n of photoacoust ic signal. These theories provide guidance for the build ing of photoacoustic spectroscopy SF6 gas detection system. The spectral lines of SF6 detection are deter mined by referring HITRAN database and the ca lculat ion of gas absorption coeffic ient of SF6,H2 O,CO2. O n this basis, the photoacoust ic spectroscopy SF6 gas detection syste m is constructed. The components of the system are selected, and a non- resonat photoacoust ic cell is designed. The photoacoust ic signal acquis it ion, storage, calibrat ion, disp lay was realized with the serial port communicat ion based on Lab VIEW. D ifferent concentrat ions of standard SF6 gas are configured by the gas distr ibut ion system and the SF6 gas detection are realized by the system built in t his paper.The results show that t he amp litude of t he photoacoustic s igna l and SF6 gas concentrat ion has a good linear relatio nship and the detection error is less than 5% when SF6 gas concentration less than 1000 ppm, the sensit ivit y has reached around 3 ppm. It suggests that, the SF6 gas detection syste m based on photoacoust ic spectroscopy in t his paper has the abilit y to detect the low concentrat ion SF6 and has extensive applicat ion prospect in the power system. |
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