Digital array scanned interferometer

• US 4,976,542 A
• Filed: 07/25/1988
• Issued: 12/11/1990
• Est. Priority Date: 07/25/1988
• Status: Expired due to Fees

• Current Assignee: William Hayden Smith
• Original Assignee: Washington University In St Louis
• Inventors: Smith, William H.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Koren, Matthew W.
• Application Number:
  US07/223,927
• Time in Patent Office: 869 Days
• Field of Search: 356/346
• US Class Current: 356/456
• CPC Class Codes: G01J 3/453 by correlation of the amplitudes

Abstract

An interferometer with a cylindrical lens which produces an interferogram imaging the field of view in the redundant coordinate onto a photon noise limited detector comprising a charge-coupled device or CCD having pixels aligned along two dimensions to provide spatial resolution in that dimension of the light source as well as spectral resolution. The CCD is also characterized by greater dynamic range, lower pixel response variation, and is photon noise limited, all of which enhances its use as a detector for a spectrometer.

Claims

1. In an interferometer having means to process light from a light source to produce a fringe pattern of interfering light (interferogram) in a focal plane, the improvement comprising optic means to image the field of view onto a detector, the detector comprising a two-dimensional, semi-conductor array detector, said detector having means to detect the light intensity of said interferogram along both axes of said two-dimensional array.

2. The device of claim 1 wherein the imaging means has means to image the field of view in only one axis.

3. The device of claim 2 wherein said imaging means comprises a cylindrical optical element.

4. The device of claim 1 further comprising a data processing means associated with said detector, said data processing means having means to determine the spectral content of said detected light.

5. The device of claim 4 wherein the data processing means has means to determine the spatial distribution of said detected light.

6. In an interferometer having means to process light from a light source to produce a fringe pattern of interfering light (interferogram) in a focal plane, and a detector positioned at an image plane having means to detect the varying intensity of the interferogram, the improvement comprising optic means to image the field of view in one dimension onto the detector to thereby preserve the spatial information of the field of view in said one dimension.

7. The device of claim 6 wherein said optic imaging means comprises a cylindrical optical element.

8. The device of claim 7 wherein said optical element comprises a cylindrical lens.

9. The device of claim 7 wherein said optical element comprises a cylindrical mirror.

10. The device of claim 6 wherein the detector has means to detect multiplexed spectral and spatial information from the light source.

11. The device of claim 6 wherein the detector is photon noise limited.

12. The device of claim 6 further comprising means to spectrally resolve the detector output to thereby determine the frequency components of the interferogram.

13. The device of claim 12 further comprising means to resolve the detector output to thereby determine the relative spatial distribution of light along said one dimension in the source producing said interferogram.

14. The device of claim 13 wherein the spatial resolving means has means to determine the relative physical location of different portions of the interferogram, and the spectral resolving means has means to determine the spectral content of said different portions to thereby provide information relating spectral content data to relative physical position in the interferogram.

15. The device of claim 14 wherein the spatial resolving means and the spectral resolving means includes a data processing means.