Method and apparatus for detecting a tracer gas using a single laser beam

摘要: A method and apparatus for airborne prospecting base precious metal deposits, petroleum natural gas geothermal steam leaks in pipelines. trace associated with the deposits near-surface atmosphere is detected a differential absorption optical technique utilizing only single laser beam to perform remote measurement. Anomalies tracer gas, which are indicative of underground by transmiting having narrow linewidth pulses at high repetition rate center wavelength approximately equal atomic line area under investigation. The directed toward investigated from an platform, reflected off ground, collected detector on platform. Each pulse received then broken down into portion containing energy coincident non-coincident using special filter. cell removes all absorpotion line, corresponds amount off-resonance. By subtracting off-resonance total received, it possible calculate on-resonance spectral interval.