Optical sensor device and method for spectral analysis

Details Optical sensor device and method for spectral analysis Optical sensor device and method for spectral analysis

2006-06-06

2006-06-06

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

C356S071000

Reexamination Certificate

active

07057723

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.45degrees 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.

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