A New Method for 3-Dimensional Visualization of Distributed Gas Using Laser Ultrasonic Technique.

概要

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A new method for diffused gases detection and location in an open space using laser ultrasonic technique is proposed. When a laser pulse which is tuned to an absorption line of a gas molecule is irradiated to a localized concentration of the gas, an acoustic pulse is generated. As to a photo-acoustic effect in an open space, it is newly found that the signal has a frequency of about 40kHz and a propagation directivity which is perpendicular to the laser axis. In the feasibility test, methane gas molecules are excited by an optical parametric oscillator (OPO) type laser source which has a wavelength of 1330nm and an output power of about 5mJ per pulse. Array microphones and 2-dimensional laser scanning system are used for detecting the gas distribution. A 3-dimensional visualization result applying to methane gas leakage is presented.
公益社団法人計測自動制御学会の論文