Quartz-enhanced photoacoustic spectroscopy gas detection apparatus and method based on beat effect
US11073469B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2018 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Mar 5, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/1704
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disclosure relates to a quartz-enhanced photoacoustic spectroscopy gas detection apparatus and method based on beat effect. Provided is a quartz-enhanced photoacoustic spectroscopy gas detection apparatus based on beat effect, comprising a photoacoustic signal detection module, a gas chamber, a light source module and a data acquisition module. In the present invention, by detecting the beat signal generated by mixing the piezoelectric signal output from the quartz tuning fork with the demodulation signal of the lock-in amplifier, the electrical parameters of the quartz crystal oscillator and the concentration of the gas to be measured can be obtained accurately in a time period on the order of milliseconds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.