No abstract

No abstract

No abstract

No abstract

Characteristics of various photorecording equipment (photometers, image sensors, laser radiation analyzers, laser communication, detection, ranging and other systems) are determined mainly by parameters of photoreceiving devices (PhRD) used. So works directed at developing more perfect PhRD (as regards to increase of accuracy, dynamic and temperature ranges ) are sufficiently important and urgent. The present communication gives results of theoretical and experimental studies of a number of new PhRD circuits.Fig. 1 shows a circuit with PhRD where the photodiode is connected between two operational amplifiers OA [ 1 , 2] . It is a so-called symmetrical circuit of PhRD (PhRDS ) of the type "OA-PhD-OA". Connecting the non-inverting input of 0A2 to the inverting input OA1 one obtains the PhRD asymmetrical circuit (PhRDa ) of the type "OA-PHD-OA" [2, 3]. Output voltage of these PhRD is described in statics by the expression Uç=-2gR,where g -PhRD sensitivity corrected to the spectrum of the recorded light flux , Rresistance of feedback resistors. For a usual PhRD of the type "PhD-OA" the output voltage at the same value R proves to be smaller by a factor of 2.The signal/noise ratio (for a bandwidth of the PhRD electronic section \f 1 kHz) is calculated as [2] N 2g ( + m1 'OA + 2I + m2 T + + m4(Cd + mSCOA + m.5C)2 e ½ (2) where q -electron charge, 'OA -OA input current (the equalitvof operational amplifier input currents is adopted to simplify the analysis), 'N -back current of the PhD p-n-junction, çt -PhD temperature potential, ROA -OA input resistance, Cd -PhD self-capacitance, COA -OA input capacitance, C -capacitance of the OA feedback circuit (it is adopted that OA1 and OA2 are O-8794-14S6-S/93/$6.QO SPIE Vol. 2161 Photometry (1993)1 233 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx