SU1062802A1 - Method of determining operating supply voltage of photoelectronic device - Google Patents

Abstract

METHOD FOR DETERMINING THE OPERATING VOLTAGE OF A PHOTOELECTRONIC DEVICE, including measurement of dark current and counting rate of dark pulses of a photoelectronic device depending on the supply voltage, characterized in that, in order to simplify the determination of the working voltage of the photoelectronic device, the latter is illuminated by a light emitting light. conditions for the dependence of the anode current and the count rate of one-electron pulses at the output of the photoelectric device on the supply voltage, and the operating voltage The power of the photoelectronic device is defined as the value corresponding to the minimum of the magnitude g (A) (where I is the stability parameter; D is the anode current of the photoelectric device under illumination conditions (Ln; jf- is the dark current; n is the counting rate of one-electron pulses in the conditions of illumination; n- - counting rate of dark pulses.

Description

The invention relates to the operation of photomultipliers, such as photomultipliers (FZUs) and dissectors, and serves to select their operating point for the supply voltage when used in measurements of the photon counting method.

A known method for determining the operating voltage of a photoelectronic device, including measuring the dependence of dark current on the count rate of dark pulses, the absolute gain of a photoelectric device on the voltage, and determining the minimum point of the stability parameter Tl,

The disadvantage of this method is the complexity of its implementation, since it involves such a time-consuming operation as measuring the absolute gain.

The closest technical solution to the invention is a method for determining the operating voltage of a photodetector, including the measurement of dark current and the count rate of dark pulses of a photoelectric device, depending on the 2J supply voltage.

In addition, measurement of the transmission coefficient of the recording equipment is carried out in a known manner while ensuring: a stable average amplitude of one-electron pulses at the output of the recording equipment amplifier, determining the dependence of the transmission coefficient on the voltage;

The disadvantage of this method is the complexity of its implementation, because to measure the transmission coefficient of the registrar equipment, it is necessary to send a sequence of standard pulses of known amplitude to the input of the amplifier and measure the amplitude of the output pulse of the amplifier, which requires the introduction of a standard pulse and a voltmeter into the measuring circuit

The purpose of the invention is to simplify the determination of the operating voltage of a photoelectric or photoelectric device.

The goal is achieved in that according to the method for determining the working voltage of a photoelectronic device, including measurement of dark current and counting rate of dark pulses of a photoelectronic device depending on the supply voltage, the photoelectronic device is illuminated by the luminous flux, measured under the conditions of the anode current dependence and the counting rate of one-electron pulses at the output of P1; an electronic device from the supply voltage, and the working voltage of the photoelectronic device is defined as e sootvetstvunadee minimum value

BUT )

where D is the stability parameter;

J, - is the anode current of the photoelectronic device in the conditions of illumination;

J is the dark current; n is the count rate of one-electron pulses under the conditions of illumination;

n- is the count rate of dark pulses.

The drawing shows a block diagram of a device for implementing the proposed method.

The device contains an illuminator 1, a folding opaque shutter 2, a photoelectric device 3, an amplifier 4, an amplitude discriminator 5, a pulse counter b, a nanoammeter 7, a multichannel analyzer 8 pulses, and a power source 9. The amplifier 4, the discriminator 5 and the counter 6 connected in series to the output of the device 3 are used to measure the pulse counting rate in the tempo mode and in the light conditions. The analyzer 8 makes it possible to determine the optimal registration mode for one-electron pulses, nanoampermet 7 - to conduct changes in the anode current.

To implement the known method, an additional generator of standard pulses connected by an output to the input of amplifier 4 and a pulse voltmeter connected by the input to the output of amplifier 4 must be entered into the circuit. In both cases, it is advisable to work with the modulated beam; then, with the flow, then with the shutter closed -2 the dependences are measured.

from the supply voltage p and e, and open-p and j, this eliminates the need to twice pass the entire range of power voltages of the photoelectric device and allows you to automate the measurement process.

The implementation of the determination of the operating voltage of the photoelectronic device according to the proposed method is achieved by eliminating the measurement procedure of transmitting the recording equipment, which usually involves applying standard pulses of known amplitude to the amplifier input, measuring the amplitude of the pulses at the amplifier output, and the transmission coefficient determine -, with respect to measured and known amplitudes. This makes it possible to derive such complicated

and expensive instruments like a standard pulse generator and a pulse voltmeter. In the proposed method, instead of measuring the coefficient (}) of the transfer agent of the recording equipment, simpler operations of measuring the anode current and the counting rate of one-electron pulses under the conditions of the photoelectric device are implemented, which are realized with the help of the known method of the nano-ammeter and pulse counter circuit.

The possibility of measuring the anode current and the rate of the single-electron pulse counting at the output of the photoelectric device instead of measuring the transmission coefficient of the recording equipment is justified by the calculation.

So, at the output of the photoelectronic device in the conditions of the drying of the E Mpe -, where M is the absolute

gain of the photoelectronic device, e - electron charge. Consequently, M- (E-1p) / (. And, since the transfer coefficient in the conditions of stabilization of the average amplitude of one electron 5 mpulse is inversely proportional to M, and the magnitude of the electron charge does not affect the corresponding supply voltage extremum

0

(n- n) / (J - 3t-),

where K is the transmission coefficient of the recording equipment; V is the stabilization amplitude, s and measurement; n and 3 leads to the same result as for K.

The invention may be used. but in the electrovacuum industry with certification of single-electron photoQ receivers and in laboratory practice to improve the threshold properties of photodetectors.

Claims (1)

(54) METHOD FOR DETERMINING THE WORKING POWER SUPPLY VOLTAGE OF A PHOTO-ELECTRONIC DEVICE, including measuring the dark current and counting speed of dark pulses of a photoelectronic device as a function of supply voltage, characterized in that, in order to simplify the determination of the operating voltage of a photoelectronic device, the latter is illuminated with a light flux, measure under lighting conditions, the dependences of the anode current and the count rate of single-electron pulses at the output of the photoelectronic device on the supply voltage, and the operating voltage pi the thaw of a photoelectronic device is defined as the value corresponding to a minimum of a value where I is a stability parameter; J is the anode current of the photoelectronic device § in lighting conditions; - dark current; η is the count rate of single-electron pulses in lighting conditions; p _t “count rate of dark impulses.