Optical sensor device and method for spectral analysis
US7057723B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2001 |
| Grant date | Jun 6, 2006 |
| Priority date | — |
| Expiry date | Jun 11, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/1205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical detection device for validating bank notes has several input apertures, an imagine device (12), a diffraction grating (15.1, 15.2, 15.3) associated with each input aperture (11.1, 11.2, 11.3) and a detection array (17). The diffraction grating (15.1, 15.2, 15.3) is rotated at angle of e.g. 45 degrees relative to the orientation of the linear detection array (17). This arrangement enables the spectra of multiple points to be measured simultaneously. The angle of rotation, the pitch of the apertures (11.1, 11.2, 11.3) and a pitch of the diffraction grating (15.1, 15.2, 15.3) are selected in such a way that the spectra of said multiple points are contiguously mapped onto the detection array (17) having a single linear array of color sensitive detection pixels. The axis of the linear array is offset with respect to an optical axis (7) of the optical detection device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.