SU1631438A1 - Device for measuring detonation factor - Google Patents

Abstract

This invention relates to a measurement technique and can be used to measure a detonation coefficient. The purpose of the invention is to improve the accuracy of the measurement. nor the detonation coefficient. During the measurement process, the measurement signal is fed through the imaging unit 1 to the frequency demodulator 3, from which the result of the frequency demodulation is fed to the weighing filter 4. The signal from the output of the weighing filter 4 is transmitted to the first or second input of the adder 5 either by means of a separation resistor 13, a diode 9, a capacitor 16 and resistors 15 and 22, or through an isolating resistor 14, a diode 10, a capacitor 18 and resistors 17 and 23. dependence on the polarity of the signal from the weighing filter 4 is the result of a one-period quasi-peak detection w E

Description

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this or that polarity is fed to the first or second input of the adder 5. In addition, depending on the polarity of the signal from the weighing filter 4, a differential signal from the resistor 15 or 17 is fed to the differential amplifier 7 or 8,

Yes capacitor 16 or 18. The signal from the differential amplifier 7 or 8 is transmitted through diode 11 and 12 and resistor 19 and capacitor 20 to the third input of the adder 5. In this case, the adder 5 subtracts the signal at its third input from the signal

caused by the charging process and the discharge at its first or second input. 1 il.

The invention relates to a measurement technique, namely, devices for measuring the detonation coefficient.

The purpose of the invention is to improve the accuracy of measurement of the detonation coefficient by reducing the influence of pulsed disturbances in the measurement signal.

The drawing shows one of the possible variants of the proposed device for measuring the detonation coefficient.

The device contains a measuring signal shaper 1 connected by an input to input bus 2 and connected by an output to an input of a frequency demodulator 3 connected by an output to an input of a weighing filter 4, an adder 5 and an indicator 6. At that, the adder 5 is connected by an output to an input of an indicator 6.

The device also contains the first and second differential amplifiers 7 and 8, the first, second, third and fourth diodes 9-12, the first and second isolating resistors 13 and 14 connected by the first terminals to the output of the weighing filter 4, and the first, second and third integrating items. The first integrating element consists of a resistor 15 and a capacitor 16, the second integrating element is from a resistor 17 and a capacitor 18, and the third integrating element is from a resistor 19 and a capacitor 20.

The second pins of the first and second de-energizing resistors 13 and 14 are connected via counter-first and second diodes 9 and 10 with the first inputs of the first and second differential amplifiers 7 and 8, respectively, and the inputs of the first and second integrating elements, respectively, whose outputs are connected to the second inputs the first and second differential amplifiers 7 and 8, respectively, and connected respectively to the first and second inputs of the adder 5. The latter is ensured by the fact that resistors 15 and 17 are connected between the first and the second inputs of the first and second differential amplifiers 7 and 8, respectively, and

the capacitors 16 and 18 are connected to the second inputs of the first and second differential amplifiers 7 and 8, respectively, and a common bus 21. In this case,

the capacitors 16 and 18 are connected, respectively, resistors 22 and 23.

The outputs of the first and second differential amplifiers 7 and 8 are connected via the included third and fourth

diodes 11 and 12 with the input of the third integrating element connected by the output to the third input of the adder 5. The latter is ensured by the fact that the third input of the adder 5 is connected to the third and fourth diodes 11 and 12 through a resistor 19 and connected to the common bus 21 through a capacitor 20 .

The operation of the proposed device for measuring the detonation coefficient is as follows.

The measurement signal, which is a frequency-modulated periodic carrier, is fed through the input bus 2 to the imaging unit 1 of the measurement signal, which amplifies and forms square pulses. The sequence of square pulses from the output of the measuring signal generator 1 is applied to

frequency demodulator 3, providing its frequency demodulation. The result of frequency demodulation from frequency demodulator 3 is fed to the weighing filter 4, which through the first separation

the resistor 13 and the first diode 9 acts on the first integrating element, and through the second decoupling resistor 14 and the second diode 10 - on the second integrating element. In this case, the first diode 9, capacitor 16 and resistors 15 and 22 act as a half-wave quasi-peak detector of one polarity, and the second diode 10, a capacitor 18 and resistors 17 and 23 as a half-wave quasi-peak detector of the other polarity. Depending on the polarity of the signal from the weighing filter 4, the adder 5 receives the result of half-wave quasi-peak detection either from the output of the first integrating element or from the output of the second integrating element. In addition, depending on the polarity of the signal from the weighing filter 4, the first and second inputs of the first differential amplifier 7 or the first and second inputs of the second differential amplifier 8 receive a short pulse signal of the corresponding polarity from the resistor 15 or resistor 17, due to the process charging and discharging capacitor 16 or capacitor 18. The extracted signal is amplified by the first differential amplifier 7 or the second differential amplifier 8 and fed through the third diode 11 or the fourth diode 12 the course of the third integrating element. The result of integration from the output of the third integrating element is fed to the third input of the adder 5 in opposite phase to the signal arriving at its first or second input. The adder 5 subtracts the signal arriving at its third input from the signal arriving at its first or second input. The result of the subtraction comes from the adder 5 to the indicator 6, which provides its display.

Claims (1)

Apparatus of the Invention A device for measuring a detonation coefficient comprising a driver measuring signal connected by an input to the input bus and connected by an output to an input of a frequency demodulator connected by an output to the input of a weighing filter and an adder connected by an output to an indicator input, characterized in that, in order to improve the accuracy of detonation measurement by reducing the effect pulse disturbances in the measuring signal; differential amplifiers, integrating elements, diodes and isolating resistors connected by the first leads to the output of the weighing filter, the second pins of the first and second de-energizing resistors are connected through the first and second diodes switched on with the first inputs of the first and second differential amplifiers, respectively, and the inputs of the first and second integrating elements, respectively, whose outputs are connected to the second inputs of the first and second differential amplifiers and connected to the first and second inputs of the adder, respectively, and the outputs of the first and second differential amplifiers are connected via connected opposite the third and fourth diodes with the input of the third integrating element connected by the output to the third input of the adder.