SU1529049A1 - Stroboscopic recorder of optical signals - Google Patents

Abstract

The invention relates to instrumentation technology and can be used to record optical signals. The purpose of the invention is to expand the scope of application of the stroboscopic optical signal recorder by choosing the amplitudes of the recorded optical signal in a wide dynamic range, for which a sawtooth generator 2, 4.1-4.N + 1 keys with an adjustable threshold, adjustable source are introduced into the stroboscopic recorder 9 power supply, adjustable voltage source 10. The stroboscopic optical signal recorder also contains a sweep unit 1, 3.1-3.N + 1 DC-interrupters, 5.1-5.N + 1 low-pass filters, an adjustable DC voltage source 6, a photomultiplier 7, block 8 processing and registration. 3 il.

Description

(21) (22) (46) (71) ro c

one

4.403683 / 24-21

09-04.88

12/15/89. Bul No. 46

Central Design Byutikomny production of the Academy of Sciences of the BSSR (72) MoR.Konon, AoPo Petrunin and YL.Petrunin

(53) 535.246 (088.8)

(56) USSR Author's Certificate No. 1004761, cl. G 01 D 5/39, 1983.

USSR Author's Certificate No. 1348662, cl. G 01 J 1/44, 1987.

(54) STROBOSCOPIC OPTICAL SIGNAL RECORDER

(57) The invention relates to instrumentation technology and can be used for recording optical signals. Pel invention extends the scope of application of a stroboscopic optical signal recorder by choosing the amplitudes of the recorded optical signal in a wide dynamic range, for which the oscillator 2 is entered into the stroboscopic recorder. Saw voltage, 4.I-4.N + 1 keys with adjustable threshold, adjustable power supply 9, adjustable reference voltage source 10. The stroboscopic optical signal recorder also contains the I sweep unit, 3.1-3.N + 1 DC isolating elements, low-pass filters 5.I-5.N + 1, adjustable DC voltage source 6, photomultiplier 7, block 8 processing and registration. 3 il.

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The invention relates to instrumentation technology and can be used to record optical signals.

The purpose of the invention is to expand the functionality of the stroboscopic optical signal recorder by selecting the amplitudes of the recorded signal in a wide dynamic range.

Fig, 1 is a schematic of a stroboscopic optical signal recorder; Fig. 2 shows a sawtooth generator and a key with an adjustable threshold; on fig.Z - timing charts work - stroboscopic recorder optical signals

The stroboscopic optical signal recorder (Fig. 1) contains a scanning unit 1, a sawtooth voltage generator 2, elements 3.1-.3.N + 1 DC overcurrent, keys 4.1-4.N + 1 with an adjustable threshold of batting, 5.1-5, N + 1 low-pass filters, adjustable voltage source 6 nor, photomultiplier tube (PMT) 7, processing and recording unit 8, adjustable power supply 9, adjustable reference voltage source 10 .

Sawtooth generator 2 (FIGO2) contains trigger 11; current generator 12, shunt transistor 13, charge capacitor 14, buffer amplifier 15

A key 4.1 with an adjustable threshold for operation (Fig. 2) contains a variable resistor 16, a voltage comparator 17, a transistor 18, a current limiting resistor 19.

The scanner unit 1 is connected to the synchronization input of the stroboscopic recorder, the first input to the control input of the processing and recording unit 8, the registration input of which is connected to the output of the photomultiplier 7, each of the dynodes and the photocathode of which

They are connected to the first output of the corresponding element 3.1-3.N + 1 DC disconnection directly, and through the corresponding filter 5.1-5. low frequencies - with a corresponding output of a controlled constant-voltage source 6. The output of each of the keys is 4. -4.N + l with an adjustable cot- trigger threshold. ,

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Dinen with the second display of the corresponding element 3.1-3. DC link, the signal input - with the output of the sawtooth generator 2, the reference voltage input - with the output of the adjustable voltage source 10, the power output - with the output of the adjustable voltage source 9, the input of the sawtooth voltage generator 2 is connected the second output of block 1 scan.

Stroboscopic recorder reference signals works as follows.

The sync input of the sweep unit 1 is supplied with an electrical synchronization pulse. The output pulse of the sweep unit 1 is fed to the input of the generator 2 of the sawtooth voltage, which generates a signal of a linearly varying voltage (with a duration exceeding the transit time of the stroboscopic sampling through the PMD 7 dynode system), which is fed to the signal input of the keys 4.1-4.N + I , the reference input of which is supplied from the regulated source 10 of the reference voltage. The threshold for each switch 4.1 (voltage 1) 4, and ,,,., And N4-1 in FIG. 3) is obtained by dividing the reference voltage and set individually for each key. At the time of comparison of the sawtooth voltage with the threshold keys 4.1–4. N + 1, the supply voltage pulses successively trigger through the corresponding elements 3.1–3. N + 1 interrupts are successively fed to the photo diode and PMT dynodes 7. Through filters 5, Low-frequency l-5cN + l from a controlled constant-voltage source 6 to the photocathode and dinodes of the photomultiplier 7 provides a constant voltage that creates an electric field decelerating electrons in the inter-single-gaps. The 5.1-5.N + 1 low-pass filters prevent the voltage pulse generated by this key 4.i from spreading to the adjacent photomultiplier electrodes 7. At the moment of time arriving during the strobe interval, the photocathode of the PMT 7 serves registered optical signal having hard synchronization with triggering pulses. The electrical signals from the output of the PMT 7 enter the processing and recording unit 8, where, after expansion, amplification and accumulation, are output to the indicator, a slow time sweep for which comes from the scan unit 1 about

In order to adjust the recorder to one or another amplitude of the optical signal, the gain adjustment of the device is carried out as follows. The voltage of the Al-AoN + l switch power source 9 is changed, and then the duration of the signal produced by the generator 2 is changed, or the voltage of the reference voltage source 10 is changed to achieve an exact temporal combination of stroboscopic sampling and pulses power produced by the keys 4.1-4, N-Hl on the electrodes of the PMT 7. Specifically, the type of adjustment is determined by the type

applied by the photomultiplier 7, the key parameters 4 „1 and the magnitude of the change of the photomultiplier gain 7, for example, when using the photomultiplier 51 51 and the duration of the signal of the sawtooth voltage generator 2 is 60, the magnitude of the reference voltage increases by 1.32 times when the gain of the photomultiplier is changed from 10 to 1G /. If the photomultiplier 7 gain changes less than 10, it is necessary to tune the generator 2 to form a signal with a duration of more than 60 NA

The sawtooth generator 2 (FIG. 2) operates as follows.

In the initial state, the transistor 13 controlled by the trigger 11 is open and shuns the capacitor 14, preventing it from being charged by the current generator 12. On a signal from the sweep unit 1, the trigger 11 tilts and closes the transistor (13, while the generator 12 begins to linearly charge the capacitor 14 Buffer amplifier 15 amplifies the signal generated on capacitor 14. Upon completion of charging, trigger 11 opens transistor 13 and it discharges capacitor 14. The duration of the formed signal is determined by the capacitor 14 and the generator current. torus 12 current. Rn duration 50 forming the NA signal amplitude of 5 V and the capacitance value of 100 pF, charging current should be 10 mA. Restructuring the generator, that, e. change the duration of the formed signal is effected by either changing the capacitance con

sensor 14, or by changing the charging current. From buffer amplifier 15, the generated signal is supplied to key 4.1 (Fig. 2). In the initial state, the transistor 18, controlled by comparator 17, is closed, and a voltage source 9 of keys is present on its collector . The inverting input of the comparator 17 sets the threshold voltage of the switch 4 with the help of the variable resistor 16. When the signal from the generator 2 exceeds the sawtooth voltage, the comparator 17 tilts and opens the transistor 18, and the resistor 19 thus limits the current through the transistor 18. Thus, on the collector of the transistor 18, a voltage supply voltage through the isolation element 3.1 is applied to the electrode of the PMT 7.

Thus, in this stroboscopic recorder, the gain of the PMT 7 can be changed in nw wide limits, which expands its scope.

Claims (1)

Invention Formula thirty five five 0 A stroboscopic optical signal recorder containing a scanner connected to the synchronization input of the stroboscopic recorder, the first output to the control input of the registration processing unit, the registration input of which is connected to the photoelectron multiplier output, each of the diodes and 0 photocathode of which is connected to the first stage of the corresponding element direct current directly, and through the corresponding low-pass filter - with the corresponding output adjustable source DC voltage, characterized in that, in order to expand the field of application, a sawtooth voltage generator, keys with an adjustable response threshold for the number of photomultiplier electrodes, an adjustable reference voltage source and an adjustable power supply are introduced, the output of each keys with an adjustable threshold of operation is connected to the second output of the corresponding DC coupling element, the signal input is from the voltage of the sawtooth generator, the reference voltage input — with the output of an adjustable reference voltage source; power supply — output with an adjustable power supply; the input of the saw voltage generator is connected to the second output of the block from the sweep, To reference source Order 7631/36 Circulation 466 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Subscription