Spectral discrimination using temporal mapping of light pulses t

Details Spectral discrimination using temporal mapping of light pulses t Spectral discrimination using temporal mapping of light pulses t

1991-12-05

1993-07-06

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

250226, 25022712, G01J 351

Patent

active

052258947

ABSTRACT:
An incriment optical signal from a potential enemy threat is captured by an array of apertures which are connected to a number of broadband filters. The broadband filters have overlapping band pass regions to cover the wavelength spectrum of potential threats, but not with the spectral resolution of a larger number of narrowband filters. To further increase resolution without adding additional filters, each broadband filter is connected to an optical delay line which converts wavelength into a time delay. To enable measurement of the time delay, additional optical lines with no relative delay are connected directly from the apertures. The time difference between when a signal arrives over optical delay lines from the filters and when a signal arrives over optical lines directly from the array of apertures is then reconverted to wavelength to a high degree of resolution.

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Jacobowitz, IBM Technical Disclosure Bulletin, vol. 18, No. 10, Mar. 1976 pp. 3384-3385.

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