SU1566374A2 - Device for determining logarithm of relationship of two values - Google Patents

Abstract

Device for measuring and computing. The purpose of the invention is to expand the field of application of the device by making it possible to measure the logarithm of the power ratio of the radiation. The device is supplemented with second 18, third 21 and fourth 22 switches, optical mixer 19, photodetector 20, synchronization unit 23 and optical radiators 24 and 25. By introducing new elements into the known device, it is possible by three operations to determine how the logarithms of the currents flowing through a pair of optical emitters, and the logarithm of the radiation power of the same emitters, did not resort to a change in the measurement scheme. 1 il.

Description

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The invention relates to the field of measuring and computing equipment and is an improvement of the known device according to auth. No. 595744.

The aim of the invention is to expand the field of application for estimates of the possibility of measuring the logarithm of the power ratio of the radiation.

The drawing shows a block diagram of the device.

The device contains the first switch 1, block 2 with adjustable transmission coefficient, the first logarithmic amplifier 3, the C subtraction unit, the second logarithmic amplifier 5, the attenuator 6, the zero-organ 7, the code-voltage converter 8, the clock selection block 9, the display unit 10 mark, reversible counter 1 generator 12 counting pulses, first 13 and second 14 elements And, decade counter 15, digital display unit 16, generator 17 clock pulses, second switch 18, optical mixer 19, photo detector 20 third 21 and fourth 22 switches block 23 synchronization, the first 24 and second 25 optical emitters.

The device operates in three modes: measurement lg (I., / I3), measurement lg (P / P0) and measurement lg (). Each measurement is carried out in two clocks determined by the clock pulse generator 17 and the clock extraction block 9.

For operation in the first mode, the synchronization unit 23 receives signals to the second 18, third 21 and fourth 22 switches, so that the fourth switch 22 turns on the power supply circuits of both optical sources 24 and 25, the inputs of the first switch 1 through the second 18 and third 21 switches are connected to the ballasts of the optical emitters 2k and 25. The leading edge of the pulses at the output of the clock generator 17 determines the start of the first cycle of the circuit, the resetting counter 11, the decade counter 15 and the unit 10 kaci sign. Due to the influence of the control voltage from the first output of the block 9, the allocation of cycles to the control input of the first switch 1, the voltage from its second input goes through block 2 with an adjustable coefficient

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transmissions and the first logarithmic amplifier 3 to one of the inputs of subtraction unit 4, to the other input of which the same voltage goes through the second logarithmic amplifier 5 and attenuator 6, and the attenuation factor of the attenuator is such that the voltage coming from subtraction unit 4 from the inputs of the zero-organ 7, during the first clock cycle, it is close to or equal to the initial voltage received from the output of the converter 8, the code is the voltage supplied to the other input of the zero-body 7. The initial voltage at the output of the converter 8 is code-n The april corresponds to the entry of the initial number into the reversible counter 11. The initial number is selected on the basis of the capacity of the reversible counter 11 and the need to measure the maximum logarithm with a positive or negative sign. The signal from the zero-organ output 7 is fed to the control input of the reverse of the reversible counter 11, while the counting pulses supplied to the input of the reversible counter 11 from the generator 12 of the counting pulses through the first element 13 are written to the reverse counter 11 so that the voltage the output of the converter 8, the code-voltage tends to be compared with the voltage at the output of the subtraction unit 4. When such an equality is achieved, the clock selection unit 9 receives from the zero output (organ 7 a signal for the end of the first measurement cycle and outputs from the first output a signal for the beginning of the second cycle to the first control input of the unit 2 with the adjustable factor before-3 and the control input of the first By whom mutator 1. By this signal, the voltage from the first output of the first switch 1 through block 2 with adjustable transmission coefficient and the first logarithmic amplifier 3 goes to subtraction block 4. Similarly to the first clock cycle, the counting of them begins pulses into the reversible counter 11 in such a way as to reduce the difference in voltage at the inputs of the null organ existing at the beginning of the second clock. At the beginning of the second clock cycle from the second output of the clock selection block 9, a signal is received to the first input of the second element 14 counting impulses

owls simultaneously on the reversible counter 11 and on the decade counter 15.

When equal voltages are achieved at the inputs of the null organ 7, a second clock end signal is produced at its output, according to which the sign indication unit 10 is activated. The clock selection unit 9, at the third output, generates a signal prohibiting the passage of the counting pulses through the first element 13 to the reversible counter 11 and the decade counter 15, the state of the second output at the time of the end of the second cycle does not change. Thus, at the time of the end of the second clock cycle, the decade counter 15 records a number proportional to the difference of the logarithms of the numerator and denominator voltages.

For operation in the second mode, from the synchronization unit 23, signals are received to the second 18, third 21 and fourth 22 switches, so that the fourth switch 22 connects to the power supply circuit only the first radiator 2k. The second switch 18 connects the output of the photodetector 20 to the first input of the first switch 1. The second input of the first switch 1 is connected via the third switch 21 to the reference voltage source U0. The same voltage is applied to the input of the attenuator 6. Further operation of the device, starting with the first switch 1, is similar to its operation in the first mode. The display of the digital display unit 16 displays a number proportional to

18().

The third mode of operation differs from the previous one in that the synchronization unit 23 arrives at the input of the fourth switch 22 such a signal that causes it to connect only the second radiator 25 to the power supply circuit. The rest of the device is similar to its operation in the second mode. The display unit 16 is digital

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the display shows a number proportional to lg (rt / P0).

Due to the introduction of blocks 18-25 into the device, it is possible to determine all three logarithms of relations in three steps, without resorting to a change in the measurement scheme,

A device for determining the logarithm of the ratio of two quantities according to the auth.St. A number, characterized in that, in order to expand the scope of application by providing the ability to measure the logarithm of the radiation power ratio, the second, third and fourth switches, the optical mixer, the first and second optical emitters, the photodetector and the synchronization unit, and the optical outputs of the first and the second optical emitters are optically connected respectively to the first and second inputs of the optical mixer, the output of which through the photodetector is connected to the first information input of the second switch, the second information input of which is connected to the current output of the first optical emitter, and the output is connected to the first information input of the first switch, the second information input of which is connected to the output of the third switch, the first information input of which is connected to the reference voltage bus, and the second information input is connected the current output of the second optical radiator, the information input of the fourth switch is connected to the power bus, and the outputs of the fourth switch are connected to Respectively with the inputs of the first and second optical emitters, the output of the synchronization unit is connected to the control inputs of the second, third and fourth switches.

Claims (1)

Claim A device for determining the logarithm of the ratio of two quantities by auth. No. 595744, which distinguishes the state of the second output at the time the second measure ends, does not change. Thus, at the end of the second measure, a number proportional to the difference between the logarithms of the voltage of the numerator and denominator is recorded in the decade counter 15. To work in the second mode, synchronization block 23 receives signals from the second 18, third 21, and fourth 22 switches so that the fourth switch 22 only connects the first emitter 24 to the power circuit. The second switch 18 connects the output of the photodetector 20 to the first input of the first switch 1 The second input of the first switch 1 through the third switch 21 is connected to a reference voltage source and ₀ . The same voltage is supplied to the input of the attenuator 6. Further operation of the device, starting from the first switch 1, is similar to its operation in the first mode. A number proportional to lg (P; / P ₀ ) is displayed on the board of the digital display unit 16. The third mode of operation differs from the previous one in that, from the synchronization unit 23, a signal is input to the fourth switch 22 that forces it to connect only the second emitter 25 to the power circuit. Otherwise, the entire operation of the device is similar to its operation in the second mode. On the scoreboard of block 16 is a digital e with the fact that, in order to expand. scopes due to the possibility of measuring the logarithm of the ratio of radiation powers, the second, third and fourth switches, an optical mixer, the first and second optical emitters, a photodetector and a synchronization unit are introduced into it, and the optical outputs of the first and second optical emitters are optically connected respectively with the first and second inputs of the optical mixer, the output of which through a photodetector is connected to the first information input of the second switch, the second information input It is connected to the current output of the first optical emitter, and the output is connected to the first information input of the first switch, the second information input of which is connected to the output of the third switch, 35 whose first information input is connected to the voltage reference bus, and the second information input is connected to the current output of the second optical emitter, the information input of the fourth switch is connected to the power bus, and the outputs of the fourth switch are connected respectively to the inputs of the first and second optical emitters, the output of block ⁴ 5 synchronization is connected to the control inputs of the second, third and fourth switches.