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Optical Engineering

High-sensitivity laser photoacoustic leak detector
Author(s): Chang-Myung Lee; Konstantin V. Bychkov; Venedict A. Kapitanov; Alexander I. Karapuzikov; Yurii N. Ponomarev; Igor V. Sherstov; Vadim A. Vasiliev
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Paper Abstract

A photoacoustic (PA) leak detector on the base of a compact CO2 laser is proposed for the detection of hydrogen leaks from cooling systems of electric power generators. Leak detection is based on a trace gas marker SF6 registration, which is added to the gas carrier within the leakage area. Experimental results of SF6 impurity detection in weak gas leakage using a PA detector with a differential ring cavity flow type are sited. The threshold sensitivity of the detector is measured at ~7.5·10-10cm-1. The effect of gas-flow rate through the detector is studied. The minimum reliably detectable flow is estimated to be ~1·10-10 Pa·m3/s, which exceeds the sensitivity of commercial helium and halogen leak detectors. Description and specifications of the developed model of a portable laser leak detector, designed in accordance with experimental results, are given.

Paper Details

Date Published: 1 June 2007
PDF: 8 pages
Opt. Eng. 46(6) 064302 doi: 10.1117/1.2748042
Published in: Optical Engineering Volume 46, Issue 6
Show Author Affiliations
Chang-Myung Lee, Univ. of Ulsan (South Korea)
Konstantin V. Bychkov, Institute of Laser Physics (Russia)
Venedict A. Kapitanov, Institute of Atmospheric Optics (Russia)
Alexander I. Karapuzikov, Institute of Laser Physics (Russia)
Yurii N. Ponomarev, Institute of Atmospheric Optics (Russia)
Igor V. Sherstov, Institute of Laser Physics (Russia)
Vadim A. Vasiliev, Institute of Laser Physics (Russia)

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