| abstract |
Improved devices, systems (14) and methods for detecting and / or identifying signals from within the signal detection area are well suited for spectral code identification. A number of independently identifiable codes can be generated by sufficiently small bodies (12a, 12b), and a plurality of these bodies or probes (12a, 12b) can be present in the detection area. By simultaneously imaging the identifiable spectrum (60) from within the detection area, the probes (12a, 12b) can be identified. Prisms, diffraction gratings, holographic transmission gratings, etc. (56) allow the image of the label to spectrally traverse the sensor surface since the distinguishable spectrum can be treated as being generated from a point source in a sufficiently large detection field. Can be dispersed. The CCD (18) can identify the relative wavelength of the signal producing the spectrum. The absolute signal wavelength can be determined by determining the position of the label, the internal wavelength reference in the spectrum (60), and the like. |