Optical subtraction of molecular dispersion signals enabled by differential optical dispersion spectroscopy
US9068940B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2013 |
| Grant date | Jun 30, 2015 |
| Priority date | — |
| Expiry date | Dec 28, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3185
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for differential optical dispersion using a first sample and a second sample are disclosed. The apparatus includes a single frequency chirped laser source configured to generate a single frequency chirped laser beam. A first beam splitter is configured to split the single frequency chirped laser beam into first and second optical branches, the first sample being located in the first optical branch, the second sample being located in the second optical branch. A frequency shifter is located in the second optical branch, downstream of the second sample. A second beam splitter is configured to combine the first and second optical branches and generate a chirp-modulated mixed light beam. A square law detector is configured to detect the chirp-modulated mixed light beam and generate a heterodyne beatnote signal. A demodulator is configured for detection of the heterodyne beatnote signal to generate a transmission/differential optical dispersion spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.