Optical heterodyne method cavity ring down spectral measurement device and method
The embodiment of the invention discloses an optical heterodyne method cavity ring down spectral measurement device and method. The measurement device comprises a laser light source for generating a laser beam, a modulation optical path mechanism, a passive resonant cavity for receiving the laser be...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The embodiment of the invention discloses an optical heterodyne method cavity ring down spectral measurement device and method. The measurement device comprises a laser light source for generating a laser beam, a modulation optical path mechanism, a passive resonant cavity for receiving the laser beam modulated by the modulation optical path mechanism and performing interference superposition on the laser beam, an optical heterodyne detection mechanism for receiving the laser beam subject to the interference superposition and generating an electrical signal, a data processing mechanism for receiving the electrical signal and determining a relationship between the electrical signal and a preset threshold, and if the electrical signal is greater than the preset threshold, the data processingmechanism sends an instruction of turning off the laser light source, collecting and drawing a ring down curve via a data collection circuit, and calculating the concentration of trace substance to be measured. By adoption o |
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