Wavelength modulation spectroscopy with multiple harmonic detection
US6356350B1 · kind B1 · utility
48Cited by
12References
34Claims
0Family size
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Key dates
| Filing date | Jul 30, 1999 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Jul 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3504
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for demodulating a plurality of frequency components output from a photodetector in a wavelength modulation spectroscopy system and determining absorption line shapes from the demodulated data. Demodulation is performed with a homodyne demodulator. Line center magnitudes of selected even harmonics of the demodulated output frequency components are measured and the absorption line shape is calculated from the relationship between these magnitudes.
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