Passive infrared motion sensing technology

Alan P. Doctor

doi:10.1117/12.179959

22 July 1994 Passive infrared motion sensing technology

Alan P. Doctor

Proceedings Volume 2217, Aerial Surveillance Sensing Including Obscured and Underground Object Detection; (1994) https://doi.org/10.1117/12.179959
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

In the last 10 years passive IR based (8 to 12 microns) motion sensing has matured to become the dominant method of volumetric space protection and surveillance. These systems currently cost less than $25 to produce and yet use traditionally expensive IR optics, filters, sensors, and electronic circuitry. This IR application is quite interesting in that the volumes of systems produced and the costs and performance level required prove that this is potential for large scale commercial applications of IR technology. This paper will develop the basis and principles of operation of a staring motion sensor system using a technical approach. A model for the motion of the target is developed and compared to the background. The IR power difference between the target and the background as well as the optical requirements are determined from basic principles and used to determine the performance of the system. Low cost reflective and refractive IR optics and bandpass IR filters are discussed. The pyroelectric IR detector commonly used is fully discussed and characterized. Various schemes for `false alarms' have been developed and are also explained. This technology is also used in passive IR based motion sensors for other applications such as lighting control. These applications are also discussed. In addition the paper will discuss new developments in IR surveillance technology such as the use of linear motion sensing arrays. This presentation can be considered a `primer' on the art of passive IR motion sensing as applied to surveillance technology.

Citation Download Citation

Alan P. Doctor "Passive infrared motion sensing technology", Proc. SPIE 2217, Aerial Surveillance Sensing Including Obscured and Underground Object Detection, (22 July 1994); https://doi.org/10.1117/12.179959

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KEYWORDS

Sensors

Infrared sensors

Infrared technology

Temperature metrology

Electronic circuits

Optical filters

Surveillance

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