Diffraction-based optical sensor detection system for capture-restricted environments

Rahul M. Khandekar; Vladimir V. Nikulin

doi:10.1117/12.780923

15 April 2008 Diffraction-based optical sensor detection system for capture-restricted environments

Proceedings Volume 6945, Optics and Photonics in Global Homeland Security IV; 69451L (2008) https://doi.org/10.1117/12.780923
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

The use of digital cameras and camcorders in prohibited areas presents a growing problem. Piracy in the movie theaters results in huge revenue loss to the motion picture industry every year, but still image and video capture may present even a bigger threat if performed in high-security locations. While several attempts are being made to address this issue, an effective solution is yet to be found. We propose to approach this problem using a very commonly observed optical phenomenon. Cameras and camcorders use CCD and CMOS sensors, which include a number of photosensitive elements/pixels arranged in a certain fashion. Those are photosites in CCD sensors and semiconductor elements in CMOS sensors. They are known to reflect a small fraction of incident light, but could also act as a diffraction grating, resulting in the optical response that could be utilized to identify the presence of such a sensor. A laser-based detection system is proposed that accounts for the elements in the optical train of the camera, as well as the eye-safety of the people who could be exposed to optical beam radiation. This paper presents preliminary experimental data, as well as the proof-of-concept simulation results.

Citation Download Citation

Rahul M. Khandekar and Vladimir V. Nikulin "Diffraction-based optical sensor detection system for capture-restricted environments", Proc. SPIE 6945, Optics and Photonics in Global Homeland Security IV, 69451L (15 April 2008); https://doi.org/10.1117/12.780923

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KEYWORDS

Cameras

Sensors

Diffraction

CCD image sensors

CMOS sensors

Diffraction gratings

Adaptive optics

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