STUDY OF THE RESPONSE TIME AND SENSITIVITY OF THE MG-32 PYROELECTRIC DETECTOR WITH A POLYPROPYLENE WINDOW IN THE VISIBLE RANGE
V.V. Gerasimov1,2, S.E. Krasnopevtsev1,2, G.R. Turkiya1, D.V. Fromichev3, V.A. Stepanov3
1Novosibirsk State University, Novosibirsk, Russia
2Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
3Joint Stock Company "Novosibirsk factory of semiconductor devise EAST", Novosibirsk, Russia
Keywords: pyroelectric detector, tetraaminodiphenyl, visible range, speed, sensitivity
Abstract
In this work, we investigate the response time and sensitivity in the visible spectral range of a commercial pyroelectric detector based on the organic crystal tetraaminodiphenyl MG-32 (JSC NSDE Vostok) with a 0.5 mm thick polypropylene input window. The sensor time constant is varied by connecting the capacitance C in the range from 2 nF to 3.8 μF to the feedback circuit of the receiver amplifier. With an increase in the capacitance in the range of 0.1 - 3.8 μF, the receiver time constant increases linearly from 0.2 to 5 ms; at lower capacitances, it reaches saturation, setting a limit of ≈ 25 μs. The voltage sensitivity is tested using diode laser radiation (λ = 637 nm), which at C = 0.1 μF is 3600 V/W, which is 8% smaller than the sensitivity of the receiver without a polypropylene window. The equivalent noise power and detectability are practically independent of the feedback capacitance in the range C = 0.002 - 0.1 μF and are approximately 1-2 orders of magnitude superior to the characteristics of other commercial pyroelectric detectors and the Golay optoacoustic cell in the visible range, which makes the receiver under study quite promising and universal for many applications.
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