Spectral analyzer with wavelength and direction indicator

• US 6,118,119 A
• Filed: 06/25/1998
• Issued: 09/12/2000
• Est. Priority Date: 12/27/1995
• Status: Expired due to Fees

• Current Assignee: Shlomo Ruschin
• Original Assignee: Shlomo Ruschin
• Inventors: Ruschin, Shlomo
• Primary Examiner(s): LE, QUE TAN
• Application Number:
  US09/101,031
• Time in Patent Office: 810 Days
• Field of Search: 250/237 G, 250/237 R, 250/216, 356/356, 356/373, 356/374, 356/328, 356/334, 356/73, 356/347, 356/305, 359/558
• US Class Current: 250/237.00G
• CPC Class Codes: G01J 3/0259 Monolithic
• CPC Class Codes: G01J 3/2823 Imaging spectrometer
• CPC Class Codes: G01S 3/784 using a mosaic of detectors

Abstract

A device for simultaneously determining the direction and wavelength of an incident light beam. The device includes a transparent block and a diffraction grating for diffracting the incident light beam to produce a number of diffracted beams within the transparent block. The device further includes a detector array generating an output indicative of positions of intersection of the diffracted beams. Finally, the device includes a processor for processing the output to determine the direction and wavelength of the incident light beam.

Claims

1. A device for simultaneously determining the direction and wavelength of an incident light beam, the device comprising:

(a) a transparent block having a first face and a second face;

(b) a diffraction grating associated with said first face for diffracting the incident light beam to produce a plurality of diffracted beams within said transparent block;

(c) a detector array associated with said second face, said detector array generating an output indicative of positions of intersection of said diffracted beams with said second face; and

(d) a processor for processing said output to determine the direction and wavelength of the incident light beam.

2. The device of claim 1, wherein said transparent block is cuboid, said first face being opposite to said second face.

3. The device of claim 2, wherein said detector array is a two-dimensional array, said output being indicative of said positions measured in two-dimensions.

4. The device of claim 3, wherein said diffraction grating includes lines ruled in two directions.

5. The device of claim 2, wherein said transparent block has a first dimension parallel to lines of said diffraction grating and a second dimension perpendicular to said lines and parallel to said second face, said detector array being located so as to measure position on said second face along said second dimension, said first dimension being significantly smaller than said second dimension so that said transparent block functions as an optical waveguide with respect to said first dimension.

6. A system for simultaneously determining the direction and wavelength of an incident light beam, the system comprising:

(a) a first device constructed according to claim 5; and

(b) a second device constructed according to claim 5, said first and second devices being positioned such that said first dimension of said transparent block of said second device is rotated by an angle of between about 30° and

about 150°

from said first dimension of said transparent block of said first device.

7. The system of claim 6, wherein said angle is about 90°

.

8. The device of claim 1, wherein said transparent block is cuboid, said first face being adjacent to said second face.

9. The device of claim 8, wherein said transparent block has a first dimension perpendicular to said first face and a second dimension parallel to both said first and said second faces, said detector array being located so as to measure position on said second face along said second dimension, said first dimension being significantly smaller than said second dimension so that said transparent block functions as an optical waveguide with respect to said first dimension for at least one of said diffracted beams.

10. A system for simultaneously determining the direction and wavelength of an incident light beam, the system comprising:

(a) a first device constructed according to claim 9; and

(b) a second device constructed according to claim 9, said first and second devices being positioned such that said first dimension of said transparent block of said second device is rotated by an angle of between about 30° and

about 150°

from said first dimension of said transparent block of said first device.

11. The system of claim 10, wherein said angle is about 90°

.

12. The device of claim 8, wherein said first face is ruled with one or more additional diffraction grating.

13. A device for simultaneously determining the direction and wavelength of an incident light beam, the device comprising:

(a) a diffraction grating located in a first plane for diffracting the incident light beam to produce a plurality of diffracted beams;

(b) an optical system for focusing said diffracted beams at a second plane parallel to said first plane;

(c) a two-dimensional detector array located substantially at said second plane, said two-dimensional detector array generating an output indicative of positions of intersection of said diffracted beams with said second plane; and

(d) a processor for processing said output to determine the direction and wavelength of the incident light beam.

14. A device for simultaneously determining the direction and wavelength of an incident light beam, the device comprising:

(a) a transparent block having a first face and a second face;

(b) a holographic image associated with said first face for diffracting the incident light beam to produce a plurality of diffracted beams within said transparent block;

(c) a detector array attached to said second face, said detector array generating an output indicative of positions of intersection of said diffracted beams with said second face; and

(d) a processor for processing said output to determine the direction and wavelength of the incident light beam.

15. The device of claim 14, wherein said holographic image additionally functions to focus the incident light beam.

16. The device of claim 14, wherein said holographic image is an image of an object approximating to a point source.