Dual-modulation faraday rotation spectroscopy
US8947663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2014 |
| Grant date | Feb 3, 2015 |
| Priority date | — |
| Expiry date | Mar 17, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/1727
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dual-modulation Faraday rotation spectroscopic (FRS) system is disclosed. The FRS system uses an FRS sample cell configured to subject a sample to a low frequency modulated magnetic field. The system includes a polarized laser light source configured to generate a high frequency wavelength-modulated light beam incident on the sample, the high frequency wavelength-modulated light beam being modulated at a higher frequency than the low frequency modulated magnetic field. A polarizer is configured to receive from the sample a transmitted light beam having a modulated polarization having a polarization rotation and translate the modulated polarization of the transmitted light beam into an intensity modulated beam. A photodetector is configured to detect the intensity modulated beam and generate a photodetector signal. A dual demodulator is coupled to the photodetector and is configured to demodulate the photodetector signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.