SU607209A1 - Pulse duration measuring pneumatic device - Google Patents

Description

(54) PNEUMATIC DEVICE FOR MEASURING THE DURATION OF PULSES

repeater 4 and which repeats at the output of the memory cell repeater. At the time the signal disappears (P 0), a normally open valve ensures the discharge of air from the tank 6 to the value of the reference pressure (0.2 kgf / cm2) of the reference pressure source.

However, at the output of the memory cell, the maximum value of the signal of the sawtooth generator was reached, which it reached at the time of the reset, since the switching of the repeater 9 is performed according to the maximum memory circuit. This signal through the upper flow chamber of the comparison element 12 and through the valve nozzle 14 opened at the time of discharge enters the amplifier 20, where it is amplified in power.

Thus, at the output of the device, a signal is generated whose magnitude is proportional to the duration of the transmitted pulse.

When the next pulse (Px 1) is fed to the input, compressed air from the command line (1) through the upper flow chamber of the comparison element 15 enters the control chamber of the valve 14, "locking a signal proportional to the duration of the transmitted pulse in the power amplifier, after which a short-term transferring the hard center of the comparison element 12 to the upper position. And the follower 9 discharge of the memory cell through the lower flow chamber of the element 12. The reset duration is adjusted by the variable throttle 13.

After the hard center of the element 12 returns to the initial (lower) position, the signal at the output of the memory cell tracks the signal of the current pulse generator. However, this signal does not pass into power amplifier 20, in which the stored signal of the previous pulse continues to remain.

Thus, the input to the power amplifier is unlocked either during the pause period, if the duration of the current pulse is less than the previous one, or earlier, as soon as the duration of the current pulse begins to exceed the output pulse duration of the previous pulse (if the current pulse duration is longer than the previous one). The latter is provided by the comparison element 15: a signal proportional to the duration of the previous pulse is locked by the valve 14 in the power amplifier 20 and in the positive chamber of the comparison element 15. Due to this, at the moment of arrival of the next pulse, when the pressure at the output of the sawtooth generator (and, consequently, in the minus chamber of element 15) is 0.2 kgf / cm, element 15 is open and the signal at its output closes the valve 14 of the switch.

As the signal at the output of the signal generator rises, the pressure in the negative chamber of element 15 rises, and as soon as this pressure exceeds the pressure of the positive chamber, the output signal of element 15 is reset to "O and valve 14 reports the output of the memory cell with the power amplifier, at its input the sawtooth signal is monitored for the remainder of the duration of the current pulse. sa

At the same time, the signal Рд through the check valve 16 enters the control chamber of the relay 19 of the pulsator and into the capacitor 17. At Pu. A tank 17 is discharged into the atmosphere through a choke 18.

5If the pause time (Pc 0) exceeds a certain preset value set by the throttle 18, the pressure in the tank 17 is less than the pressure of the overflow of the relay 19, as a result of which the latter resets the supply pressure of the power amplifier 20. This provides

 automatic setting to "About the indicator of the secondary device, if the duration of the pause between the pulses arriving at the device input (or when they arrive) exceeds a certain

for specific conditions the limit, which improves the accuracy of the device.

Claims (2)

1. Catalog “Instruments and automation equipment, issue. 8, 1974. 2. USSR author's certificate number 477312, cl. G 01 G 13/24, 11.04.73. Ji