Light sensor protection and method for protecting a light sensor with laser radiation attenuating gas

• US 7,485,849 B2
• Filed: 05/03/2006
• Issued: 02/03/2009
• Est. Priority Date: 05/03/2006
• Status: Expired due to Fees

• Current Assignee: Government of the United States of America
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Sonstroem, Jaime
• Primary Examiner(s): Luu; Thanh X
• Assistant Examiner(s): Legasse, Jr.; Francis M
• Application Number:
  US11/381,377
• Publication Number:
  US 20070257187A1
• Time in Patent Office: 1,007 Days
• Field of Search: 359/227, 359/228, 359/252, 359/253, 250/239, 250/351
• US Class Current: 250/239
• CPC Class Codes: G01J 1/04 Optical or mechanical part supplementary adjustable parts
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/0418 using attenuators
• CPC Class Codes: G01J 2001/0285 against laser damage

Abstract

A light sensor protection system and method protects a light sensor system from a laser threat. The light sensor system has a sensor housing which contains optical elements disposed within the sensor housing and at a first end of the housing to converge light rays entering the housing at a focal plane. A focal plane array is disposed within the sensor housing substantially coincident with the focal plane. A means for protecting the light sensor system from a laser threat is disposed within the housing remote from the optical elements, the light rays, and the focal plane array. The method includes the steps of (a) providing a light sensor system as described above; and (b) protecting the light sensor system from a laser threat in the presence of a laser threat or upon a warning thereof with the means for protecting the light sensor system from a laser threat.

Claims

1. A light sensor system comprising:

a sensor housing having a port in its wall, the sensor housing containing optical elements disposed within the sensor housing and disposed at a first end of the housing to converge light rays entering the housing at a focal plane;

a focal plane array disposed substantially coincident with the focal plane; and

means disposed within the housing outside of the optical elements, the light rays, and the focal plane array for protecting the light sensor system from a laser threat,

the protecting means including a container formed from a breachable material and positioned proximate the port, the container filled with a laser radiation attenuating gas; and

means for breaching the container disposed externally of the housing and proximate the port, the breaching means adapted to pass through the port to contact the container.

2. The light sensor system according to claim 1, wherein the container is a replaceable capsule.

3. The light sensor according to claim 1, wherein the container is a replaceable balloon.

4. The light sensor according to claim 1, wherein the laser radiation attenuating gas is in a compressed liquid state which converts to a gaseous state when the container is breached.

5. The light sensor system according to claim 1, wherein the means for breaching the container comprises an implement for exerting a large amount of force over a small area.

6. The light sensor system according to claim 1, wherein the means for breaching the container comprises a piercing implement.

7. The light sensor system according to claim 1, wherein the means for breaching the container comprises a cutting implement.

8. The light sensor system according to claim 1 wherein the means for breaching the container comprises a crushing implement.

9. The light sensor system according to claim 1, wherein the port includes a means for providing a fluid impervious seal.

10. In a light sensor system having a sensor housing which contains optical elements disposed within the sensor housing and disposed at a first end of the housing to converge light rays entering the housing at a focal plane and a focal plane array disposed substantially coincident with the focal plane,

means disposed within the housing outside of the optical elements, the light rays, and the focal plane array for protecting the light sensor system from a laser threat,

the means for protecting the light sensor system comprising a readily replaceable container formed from a breachable material and filled with a laser radiation attenuating gas,

the housing having a port with a fluid impervious seal located in a wall thereof proximate the container;

and

means for breaching the container disposed externally of the housing and proximate the port and adapted to pass through the port to contact the container.

11. A method of protecting a light sensor system from a laser threat comprising the steps of:

(a) providing a light sensor system having;

a sensor housing,

optical elements disposed within the sensor housing and at a first end of the housing, the optical elements converging light rays entering the housing at a focal plane,

a focal plane array disposed substantially coincident with the focal plane, and

means disposed within the housing outside of the optical elements, the light rays, and the focal plane array, for protecting the light sensor system from a laser threat and comprising a readily replaceable container formed from a breachable material that is filled with a laser radiation attenuating gas and is adapted to be breached in the presence of a laser threat or upon a warning thereof, and

(b) protecting the light sensor system from a laser threat in the presence of a laser threat or upon a warning thereof with the means for protecting the light sensor system from a laser threat by actuating a means for breaching the container to breach the container in the presence of a laser threat or upon a warning thereof, the means for breaching the container being disposed externally of the housing and proximate a port with a fluid impervious seal located in a wall of the housing proximate the container, the breaching means being adapted to pass through the port to contact the container in the presence of a laser threat or upon a warning thereof.