NASA NTRS · 19780000168
Low-background trace-gas detector
Abstract
Spectrophone detects very small concentrations of trace gases. With gas in sample cell, laser is tuned to absorption line of interest. Molecular absorption in cell produces pulsed acoustical pressure at chopper frequency. Two optical paths with very different absorption lengths are used to pretune cell to balance out background absorption by cell windows.
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Rosengren, L.. 1978-10-01. Low-background trace-gas detector. https://ntrs.nasa.gov/citations/19780000168
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