Atmospheric pressure monitoring of trace gases using tunable diode lasers
DT Cassidy, J Reid - Applied Optics, 1982 - opg.optica.org
DT Cassidy, J Reid
Applied Optics, 1982•opg.optica.orgHigh-sensitivity measurements of infrared absorptions due to isolated lines broadened by air
at atmospheric pressure are reported. Tunable diode lasers and harmonic techniques were
employed to detect absorptions as small as 0.01% over path lengths up to 250 m through
the open air. The limiting noise source is caused by a base line signal which varies with the
optical alignment. The reported sensitivity is not a fundamental limit. Techniques for further
increasing sensitivity are discussed.
at atmospheric pressure are reported. Tunable diode lasers and harmonic techniques were
employed to detect absorptions as small as 0.01% over path lengths up to 250 m through
the open air. The limiting noise source is caused by a base line signal which varies with the
optical alignment. The reported sensitivity is not a fundamental limit. Techniques for further
increasing sensitivity are discussed.
High-sensitivity measurements of infrared absorptions due to isolated lines broadened by air at atmospheric pressure are reported. Tunable diode lasers and harmonic techniques were employed to detect absorptions as small as 0.01% over path lengths up to 250 m through the open air. The limiting noise source is caused by a base line signal which varies with the optical alignment. The reported sensitivity is not a fundamental limit. Techniques for further increasing sensitivity are discussed.
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