Optical system for obtaining separate and simultaneous near-infrared and visible light images

• US 5,311,018 A
• Filed: 02/11/1993
• Issued: 05/10/1994
• Est. Priority Date: 02/11/1993
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Zana, Lawrence J., Breakey, Gerald A.
• Primary Examiner(s): Hannaher, Constantine
• Application Number:
  US08/016,396
• Time in Patent Office: 453 Days
• Field of Search: 250/330, 250/341
• US Class Current: 250/330
• CPC Class Codes: G01S 17/89 for mapping or imaging

Abstract

A camera system for simultaneously recording separate near-infrared and visible light images is disclosed having a visible light source for illuminating a given area with visible white light, indicia generating means for directing an image of a wavelength of light longer than wavelengths of light of the visible white light upon the given area, a first electronic camera for recording an image of the visible light but not the longer wavelength of light and a second electronic camera for recording an image of the longer wavelength of light but not the visible light, and a single cold mirror common to the two cameras for directing the two light images to their respective cameras.

Claims

1. A camera system for simultaneously recording separate near-infrared and visible light images comprising:

(a) visible light source means for illuminating a given area with visible white light;

(b) indicia generating means for directing a light stripe image of a wavelength of light longer than wavelengths of light of the visible white light upon said given area, the image having an area substantially smaller than said given area;

(c) first camera means for recording an image of said visible light but not said longer wavelength of light;

(d) second camera means for recording an image of said longer wavelength of light but not said visible light;

(e) a first optical system for transmitting said visible light but not said longer wavelength of light from said given area to said first camera means;

(f) a second optical system for transmitting said longer wavelengths of light but not said visible light to said second camera means; and

(g) mirror means positioned within said first and second optical system and between said given area and both said first and second camera means, said mirror means being configured to reflect said visible light and transmit said longer wavelengths of light through said mirror means to said second camera means.

2. The camera system of claim 1 wherein said visible light source means comprises a lamp which generates some infra-red radiation, and further including a short-pass filter for blocking transmission of the infra-red radiation to said given area.

3. The camera system of claim 2 wherein said visible light source means includes a quartz-halogen lamp.

4. The camera system of claim 3 wherein said first and second camera means comprise electronic image sensors.

5. The camera system of claim 2 wherein said first and second camera means comprise electronic image sensors.

6. The camera system of claim 1 wherein said first and second camera means comprise electronic image sensors.

7. A camera system for simultaneously recording separate near-infrared and visible light images comprising:

(a) visible light source means for illuminating a given area with visible white light;

(b) indicia generating means for directing a light stripe image of a wavelength of light longer than wavelengths of light of the visible white light upon said given area, the image having an area substantially smaller than said given area;

(c) first camera means for recording an image of said visible light but not said longer wavelength of light;

(d) second camera means for recording an image of said longer wavelength of light but not said visible light;

(e) a first optical system for transmitting said visible light but not said longer wavelength of light from said given area to said first camera means;

(f) a second optical system for transmitting said longer wavelengths of light but not said visible light to said second camera means; and

(g) means for positioning a wavelength responsive optical component within said first and second optical system and between said given area and both said first and second camera means, said wavelength responsive optical component being configured to reflect said visible light and transmit said longer wavelengths of light through said mirror means to said second camera means.

8. The camera system of claim 7 wherein said visible light source means comprises a lamp which generates some infra-red radiation, and further including a short-pass filter for blocking transmission of the infra-red radiation to said given area.

9. The camera system of claim 8 wherein said visible light source means includes a quartz-halogen lamp.

10. The camera system of claim 9 wherein said first and second camera means comprise electronic image sensors.

11. The camera system of claim 8 wherein said first and second camera means comprise electronic image sensors.

12. The camera system of claim 7 wherein said first and second camera means comprise electronic image sensors.

13. A camera system for simultaneously recording separate near-infrared and visible light images comprising:

(a) visible light source means for illuminating a given area with visible white light;

(b) indicia generating means for directing at least one narrow elongated image of a wavelength of light longer than wavelengths of light of the visible white light upon said given area;

(c) first camera means for recording an image of said visible light but not said longer wavelength of light;

(d) second camera means for recording an image of said longer wavelength of light but not said visible light;

(e) a first optical system for transmitting said visible light but not said longer wavelength of light from said given area to said first camera means; and

(f) a second optical system for transmitting said longer wavelengths of light but not said visible light to said second camera means, simultaneously with transmission of said visible light to said first camera means.

14. The camera system of claim 13 wherein said visible light source means comprises a lamp which generates some infra-red radiation, and further including a short-pass filter for blocking transmission of the infra-red radiation to said given area.

15. The camera system of claim 14 wherein said visible light source means includes a quartz-halogen lamp.

16. The camera system of claim 15 wherein said first and second camera means comprise electronic image sensors.

17. The camera system of claim 14 wherein said first and second camera means comprise electronic image sensors.

18. The camera system of claim 13 wherein said first and second camera means comprise electronic image sensors.