Laser-hardened eye protection goggles

• US 5,760,852 A
• Filed: 11/03/1995
• Issued: 06/02/1998
• Est. Priority Date: 11/03/1995
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Original Assignee: Hughes Electronics Corporation (AT&T, Inc.)
• Inventors: Lim, Khoon-Cheng, Wu, Shin-Tson, Hsu, Tsung-Yuan, Wu, Chiung-Sheng
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US08/552,412
• Time in Patent Office: 942 Days
• Field of Search: 349/13, 349/14, 349/62, 349/57, 349/159, 349/161, 351/44, 351/45, 385/115, 385/901, 385/116, 385/119, 385/120, 250/208.1, 250/227.11, 250/227.12, 250/227.2, 345/8, 345/32
• US Class Current: 349/14
• CPC Class Codes: A61F 9/022 Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs optical filters per se G02B5/20
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images

Abstract

An imaging system that can tolerate high intensity optical beams without a reduction in the system'"'"'s field-of-view, comprises an imager, a fiber array positioned at the image plane of the imager, a sensor array positioned at the output end of the fiber array, a panel display positioned in proximity of the fiber array and an image processor for electronically processing the information from the sensor array.

Claims

1. An imaging system comprising:

an imager positioned to create an image of a scene and to focus an incident collimated optical beam onto an image plane;

a fiber array having an input end and an output end, said input end positioned at said image plane so that said fiber array captures the image and the focused optical beam and guides them to the output end, said fiber array including a plurality of optical fibers, said focused optical beam having an input diameter at the input end and an output diameter at the output end;

a sensor array positioned at the output end of said fiber array so that said sensor array captures said image and focused optical beam from the output end of the optical fiber array and generates output signals, said sensor array including sensor elements comprising a solid state photosensor material, said sensor elements having a surface area;

an image processor for processing the image and focused optical beam from the sensor array;

a panel display, separately positioned from the sensor array, for reading the processed image and optical beam from the image processor;

wherein each optical fiber has a length such that the output diameter of the focused optical beam is substantially greater than the input diameter of the focused optical beam.

2. The imaging system of claim 1 wherein the image from the sensor array is an inverted image and the image processor erects said inverted image.

3. The imaging system of claim 1 wherein the output signals from the sensor array is in a linear form and the image processor converts said optical beam into a logarithmic form.

4. The imaging system of claim 1 wherein said optical fibers are substantially straight.

5. The imaging system of claim 1 wherein said fiber array is a gradient index lens.

6. The imaging system of claim 1 wherein said sensor array includes thin film phototransistors.

7. The imaging system of claim 1 wherein said sensor array includes a charge-coupled device.

8. The imaging system of claim 6 wherein said thin film phototransistor is a black matrix/metal-type phototransistor comprising a plurality of pixelized elements, said pixelized element having a pixel size.

9. The imaging system of claim 1 wherein the optical fibers have a fiber surface area substantially equal to the surface area of the sensor elements.

10. The imaging system of claim 1 further comprising a diamond film array between the fiber array and the sensor array.

11. The imaging system of claim 1 wherein the panel display includes of a flat panel display device.

12. The imaging system of claim 11 wherein the flat panel display device is a thin-film-transistor liquid crystal device.

13. The imaging system of claim 11 wherein the flat panel display device is a high resolution flat panel display.

14. The imaging system of claim 11 wherein the flat panel display device is a transmissive mode thin-film-transistor liquid crystal device with a back-lighting.

15. The imaging system of claim 11 wherein the panel display further includes a thin-film electroluminescent device.

16. The imaging system of claim 1 wherein the panel display includes a self-emissive display.

17. A method for protecting a viewer from a laser threat, the steps comprising placing the imaging system of claim 1 between the laser threat and the viewer.

18. An eye protection device wherein an objective lens creates an image and focuses an incident collimated optical beam at a image plane, comprising:

a fiber faceplate having an input end and an output end, said input end positioned at said image plane so that the fiber faceplate captures the image and the focused optical beam and guides them to its output end, said fiber faceplate including a plurality of optical fibers;

a photosensor array positioned at the output end of said fiber faceplate, so that said photosensor array captures said image and focused optical beam from the output end of the fiber faceplate and generates output signals, said photosensor array including sensor elements comprising a solid state material having a solid state damage threshold, said photosensor array outputing an electronic gain;

an image processor comprising an electronic circuitry capable of allowing control of the output signals from the photosensor array, wherein said electronic circuitry processes the image and focused optical beam from the photosensor array;

a display device positioned in close proximity to said solid state photosensor array for reading the processed image and optical beam from the image processor.

19. The eye protection device of claim 18 wherein the optical fibers in said fiber faceplate have a damage threshold greater than the solid state damage threshold.

20. The eye protection device of claim 18 wherein the image from the sensor array is an inverted image and the image processor erects said inverted image.

21. The eye protection device of claim 18 wherein the output signals from the sensor array is in a linear form and the image processor converts said focused optical beam into a logarithmic form.

22. The eye protection device of claim 18 wherein said optical fibers are substantially straight.

23. The eye protection device of claim 18 wherein said fiber array is a gradient index lens.

24. The eye protection device of claim 18 wherein said sensor array includes thin film phototransistors.

25. The eye protection device of claim 18 wherein said sensor array includes a charge coupled device.

26. The eye protection device of claim 24 wherein said thin film phototransistor is a black matrix/metal-type phototransistor comprising a plurality of pixelized elements.

27. The eye protection device of claim 26 wherein:

the optical fibers have a fiber surface area;

the sensor elements have an element surface area substantially equal to said fiber surface area.

28. The eye protection device of claim 18 wherein the panel display is a transmissive mode, high resolution flat panel display device.

29. The eye protection device of claim 28 wherein the panel display includes a thin-film-transistor liquid crystal device.

30. The eye protection device of claim 29 wherein the panel display further includes a thin-film electroluminescent device.

31. The eye protection device of claim 18 wherein the panel display includes a self-emissive display.