ＣＯ２レーザによる光音響変換ガス濃度測定システムについて

DOI Web Site 被引用文献2件 参考文献23件

書誌事項

タイトル別名
  • On The Gas Concentration Measuring System by Optoacoustic Effect using CO2 Laser.
  • CO2 レーザ ニ ヨル ヒカリ オンキョウ ヘンカン ガス ノウド ソクテイ

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抄録

In the past, many methods of measuring gas concentration were developed. However, limitations lixe; selectivity in the kind of gases the system can measure, range of gas quantity and pre-treatment requirements prevented the wider applications of these techniques.<BR>The objective of this research is to develop a method for measuring gas concentrations that is free from the above mentioned limitations. In this regard, the principle and the technique of measuring the sound generated by the spectral diffraction of a laser beam was investigated.<BR>This technique is fundamentally different from any other usual spectroscopic analysis: this is an indirect method which measures the acoustic pressure emitted from gas when the photo energy is supplied to it.<BR>First, miniaturized laser equipment was fabricated based on diagrams and gas flow type. Then the primary parameters in this system in terms of the sensitivity of this system are the following; the laser's power output, the chopping frequency and the acoustic cell shape. The influence of these factors on the sound generated by the beam were investigated.<BR>As an condition of this system, a CO2 laser with output power of under 5.0W, a radial cell and a chopping frequency of 20Hz were chosen. As a result of the experiments under this condition, we confirmed that acoustic signal is proportional to gas concentration of single and mixture gas.<BR>For high sensitivity analysis of measuring acoustic signal, the noise characterics in measuring system, which was occured by discharge tube of laser, microphone, acoustic cell and so on, were measured and were eliminated. The new discharge tube of laser without noise was fabricated. And we maked out for the about thirty kinds of diameter, axies lenngth and mass of acoustic cell. The chopping frequency was chosen outside for frequency of noise. It was found that the gas concentrations of Ethylene was measurable in the ranges of concentration 1ppm-10%.

収録刊行物

  • 資源と素材

    資源と素材 111 (4), 219-224, 1995

    一般社団法人 資源・素材学会

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