Alternative approach for optical monitoring of arbitrarily distributed substances

Martirosyan, A. E.; Kostanyan, R. B.; Muzhikyan, P. H.; Azizbekyan, H.

doi:10.1364/ao.57.009944

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…In the last years, the non-imaging concept has been developed for remote sensing of structured objects. 16 The concept is used for optical monitoring of integral properties of arbitrarily distributed substances using a specially designed radially quadratic transmittance-apodizing filter. Based on this technique, the single object movement is recorded 17 in the visible spectrum, where the detection system uses non-matrix detectors operating in a linear sensitivity range.…”

Section: Introductionmentioning

confidence: 99%

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Distant human detection in the thermal infrared region

Martirosyan,

Kostanyan,

Martirosyan

et al. 2024

Opt. Eng.

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Human detection equipment that operates indoors and outdoors plays an important role in modern security applications. We describe a nonconventional system to detect thermal infrared radiation from relatively hot objects using a conical horn and a non-matrix thermal infrared sensor. It is shown that using a conical horn as a radiation concentrator in a recording device is preferable to a focusing lens due to specific differences between them. A software program in Python is developed to permanently observe the thermal infrared radiation from surroundings. The obtained results indicate an inverse relationship between the angle of view and the gain level of conical horns. It is experimentally shown that the horn-sensor pair detects humans at long distances (up to 40 m) with a relatively narrow angle of view of 16 deg. On the other hand, using a conical horn with a wider apex angle increases the angle of view of the recording system up to 30 deg but reduces the detection range. The device with four coupled horn-sensor pairs extends the horizontal angle of view to 90 deg. The developed technique can operate day and night, indoors (including observation of long corridors), and outdoors to monitor humans and vehicles or to prevent fires. The recording system can be applied together with other security equipment as an initial alarm system that triggers video monitoring and night vision devices.

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Section: Introductionmentioning

confidence: 99%

“…In the last years, the non-imaging concept has been developed for remote sensing of structured objects 16 . The concept is used for optical monitoring of integral properties of arbitrarily distributed substances using a specially designed radially quadratic transmittance-apodizing filter.…”

Section: Introductionmentioning

confidence: 99%