Multi-channel, self-calibrating fiber-coupled raman spectrometers including diagnostic and safety features
US7158225B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2004 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Feb 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/12723
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-channel, reconfigurable fiber-coupled Raman instrument uses fiber optic switches for laser and calibration light routing to facilitate automated calibration, diagnosis and operational safety. The system allows wavelength axis calibration on all channels; laser wavelength calibration (including multiple and/or backup laser options); fiber coupling optimization; fault detection/diagnosis; and CCD camera binning setup. In the preferred embodiment, dedicated calibration channels surround data channels on a 2-dimensional CCD dispersed slit image implemented using a unique cabling architecture. This “over/under” calibration interpolation approach facilitates quasi-simultaneous or sequential calibration/data acquisitions. CCD binning between sequential calibration and data acquisitions enables higher density multi-channel operation with tilted images based upon a multiplexed grating configuration. A diamond sample is used as a Raman shift reference for laser calibration, preferably in the form of a small disc sampled with an edge-illuminating probe using two unfiltered fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.