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23 February 2006 Auto-nulling system design of ultraviolet enhanced electrically calibrated pyroelectric radiometer
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Electrically calibrated pyroelectric radiometer (ECPR) is a kind of electrical substitution radiometer (ESR) with high precision in optical power measurement. Its electrically calibrated pyroelectric detector (ECP) has been a widely used instrument in measuring optical power at relatively low levels over a broad wavelength range. The Precise automatic electrical pulse is used to heat the detecting surface which has the gold-black absorber material, and the electrical signal is accurately equal to the generated electrical signal of the modulated optical signal illuminated on the same detecting surface. This paper presents the principle of the electrical-optical equivalence and the auto-nulling circuit. The auto-nulling circuit is a kind of servo-loop circuits which could adjust the magnitude of the current pulses to reach the null condition at the output of the synchronous rectifier circuit. At this point, the optical power is equal to the electrical power, so the absolute value of the optical illumination can be determined by measuring the electrical power.
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Qi Hu, Lingjuan Gu, Wen Li, and Songlin Zhuang "Auto-nulling system design of ultraviolet enhanced electrically calibrated pyroelectric radiometer", Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61504W (23 February 2006);


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