# US 5,708,504 A · Interfering imaging spectrometer

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- Number: US 5,708,504 A
- Document ID: US5708504A
- Status: Granted
- Kind: A
- Application number: 08/736,690
- Filed: 1996-10-25
- Granted: 1998-01-13
- Earliest claimed: 1996-10-25
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Inventors: Mark F. Hopkins
- Web page: https://patentgrep.com/patent/US5708504A

## CPC

- G01J 3/36: Investigating two or more bands of a spectrum by separate detectors
- G01J 3/26: using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filters
- G01J 3/2823: {Imaging spectrometer}
- G01J 3/021: {using plane or convex mirrors, parallel phase plates, or particular reflectors}
- G01J 2003/1226: {Interference filters}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)

## Abstract

An interfering imaging spectrometer is described wherein a single interference filter disposed in preselected angular relationship with one or more mirrors separates an incoming optical signal or field of view into multiple contiguous images separated spatially and spectrally, each image having a unique spectral content.

## Claims

### Claim 1

An interfering imaging spectrometer system, comprising:
(a) optical means for directing an optical signal along a preselected optical axis;
(b) a collimating lens disposed along said optical axis for collimating said optical signal and directing a collimated optical signal along said optical axis;
(c) an interference filter disposed along said optical axis for selectively filtering said collimated optical signal, said interference filter having transmittance in a preselected passband and disposed at a preselected angle to said optical axis for transmitting a first transmitted signal along said optical axis and reflecting a reflected signal at an angle corresponding to said preselected angle of said interference filter;
(d) a mirror disposed near said interference filter in preselected angular relationship to said interference filter and said optical axis for directing said reflected signal onto said interference filter and providing a second transmitted signal along said optical axis and a second reflected signal from said interference filter, said second transmitted signal having spectral content dependent on the angular relationship between said interference filter and said mirror and defining an image separated spatially and spectrally from the image defined by said first transmitted signal; and
(e) an imaging lens and an optical detector disposed along said optical axis, said imaging lens disposed for imaging the transmitted signals onto said optical detector.

### Claim 2 (depends on 1)

The spectrometer system of claim 1 wherein said optical detector is a charge-couple device, photodiode array or infrared array.