PSI’s Intensity-Dependent Infrared Blocking Filter for Source Exclusion

Physical Sciences Inc. (PSI) has been awarded a research program from the U.S. Air Force Research Laboratory to develop an intensity-dependent infrared filter that will use the radiant intensity of a source (i.e., the sun) to locally control the infrared transmission of the filter.

PSI’s filter will be placed at an intermediate focal plane and will use the full spectrum of the sun’s energy to attenuate the IR transmission only where the image of the sun is formed, allowing the bright source to be passively dimmed without distorting or blocking the rest of the image field, and will not require an external power source.

PSI’s source-blocking filters will have applications in thermal imaging systems and mid- and longwave infrared hyperspectral imagers. In addition to its military applications, this technology has applications in the civilian market for domestic search and rescue operations and infrared and hyperspectral imaging supporting crop-evaluation.

For more information, contact:

Dr. Joel Hensley
Area Manager, Optical Devices and Technologies
Physical Sciences Inc.
Telephone: (978) 689-0003