Chiral mixture detection system using double reference lock-in detector
US7590196B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 2005 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | May 5, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/218
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a method, circuit and system for phase-sensitive detection and recovery of complex signals of interest using a double reference lock-in detector. A double reference lock-in detector may have two or more reference signal sources whose signals are first combined, producing a composite (e.g., inter-modulation) reference signal. This signal is then mixed with an input signal, yielding the desired selectivity at the frequency(ies) of interest. A second embodiment uses external reference signals, synchronizing internal references to these before combining the reference signals. Such detectors may used in chiral detection systems for recovering predetermined signals of interest associated with chiral properties of a sample being tested.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.