SU1627862A1 - Photo-electric device - Google Patents

Description

one

(21) 4669991/25

(22) 30,03,89

(4b) 15.02.91 c. № 6

(71) Kiev Polytechnic Institute named after 50 years of the Great October Socialist Revolution of Great Britain

(72) 0 „ML Rudin, IoI.Katsan, B„ I „Lunin and G ,. And about Frolov

(Bz) 621 „383 (088„ 8)

(50) Patent of Great Britain No. 2171512,

sp G 01 J 1/44, 1986s

Chernov E0 And o Photodetectors based on photodiodes and their application - MS: CRI Electronics, 198b, Co44s

(54) YuTOIORIEMNOYE DEVICE (57) The invention relates to a technique for measuring light radiation and can be used in photometry, in particular in photodetector devices for precision signal recording, operating in a wide range of light fluxes. The purpose of the invention is to improve the accuracy of the photodetector and expand the dynamic range of measurements by eliminating the influence of the series resistance of the photodiode a. The device contains a photodiode 1, operational amplifiers 2, 4, and resistors 3, 5, 6, 7 Amplified voltage connected in series with the cyode, it is cast onto the inverter; r-. input of an operational amplifier photoreceiver.- This pgl3r tg e: maintain voltage ol-psr - during the photodiode is zero in a wide range of illuminated light, while maintaining a high linearity of the pr - the formation of a light flux in the electrical signal ,, 1 or „

Y5

The invention relates to a technique for measuring light radiation and can be used in photometry, in particular in precision devices operating in a wide range of light fluxes with

The purpose of the invention is to improve measurement accuracy and broaden the dynamic range by compensating for the effect of series diode resistance.

The drawing shows a circuit diagram of a photodetector;

The device contains a photodiode I s the first operational amplitude) - (SU) 2, the resistor 3 is a reverse switch, the second op-amp 4 and the resistors 5, 6 and 7 o

The values of the resistors 5, 6 and 7 are equal, respectively, R R and K2. The positive resistances of the contacts of the photodiode are equal respectively to KP1 and

KP2

The device works as follows.

Cfc

to

with

OS

W

-gh

LED, causes a drop in the load at points I - 11:

UA

 F

- U i

UDUr

(KP2 K-GM

-It1

UA

 t voltage at points 8.9.10 and 11, respectively.

Hence, the case is a voltage on pn-mepexojit (|, chi (d, 1 1 is equal to

L1

 is

 (I

- R.

h r

UD-UA -.)

V

since the value of Rn is determined by known methods according to the current-voltage characteristic

(1) The use of a photodetector device makes it possible to increase the measurement accuracy both in the field of weak and strong light signals by applying a photovoltaic mode of the receiver RDb 10 and eliminating the effect of the photodiode series resistance

gi lЈ

stress performed

(2)

v (IG1I l C II

nl ov 4 and the lists of b and 7, the conversion of the palm of your hand - the voltage U to the voltage G l

(one

M) R /

R - is the resistance of resistors 1 and b

Since voltage V

exactly | TO

Forced to displace the OU 2 ravch ShRNA U, expression (2) can be 25

t

prprr, 1zpvat

I

then ai u

I -HC

G up to doubled for example | p i bias of op-amp 4), and p-p-junction photo-1 diode i 1 raps in short mode: about 1 L-P clny regardless of the level o (shchmtshklkl and and the value of consecutive c (i resistance L

The backing of the sawing point 5, equal to the current resistance of the photo / base, is not a complex step,

Claims (1)

Invention Formula A photoconductive device containing a photodiode, one of the electrodes of which is connected to an inverting input. O. is the house of the first operational amplifier 20 and the first output of the feedback resistor, the second output of which is connected to the output of the first operational amplifier, in order to increase accuracy of measurements and expansion of the dynamic range; a second operational amplifier, second, third, and fourth resistors are inserted into the device; the three-fold electrode of the photodiode is connected to the non-inverting input of the second one; The second amplifier, as well as through the second resistor to the common bus, and the second operational amplifier together with the third and fourth resistors form the HeHHBepTHpvioinjirt. voltage amplifier, the output of which is connected to the non-inverting input of the first operational amplifier; 4-way amplifiers are output device buses. (BUT) (2) .) (BUT) eleven