Self-normalizing single-beam laser spectrometer
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United States of America Patent
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Jun 26, 1990
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N/A
app pub date -
May 26, 1988
filing date -
May 26, 1988
priority date (Note) -
Expired
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Abstract
Self-normalization of laser spectrometers is provided by I'/I laser modulation and detection. A single tunable diode laser is frequency modulated by a high S/N ratio triangle wave, mechanically chopped, passed through an isothermal in-line gas and reference chamber absorption cell, and synchronously detected to provide the I' and I signals. The preferred embodiment discloses isotopic ratio measurements. The invention has application to quantitative trace gas measurements generally.
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