SU528540A1 - Device for measuring pulse duration - Google Patents

Description

The invention relates to the field of measurement technology and can be, in particular, used in radar.

A number of pulse width measuring devices are known, whose operation is based on obtaining the envelope of a burst by detecting and then measuring the duration of video pulses 1.

It is known, in particular, a device for measuring the duration of bursts of pulses containing a pulse shaper with normalized edges, a delay line and a time-code-2 transducer. However, such a device has a low accuracy in measuring the duration of a batch, the frequency and shape of the pulses can vary arbitrarily.

The aim of the invention is to increase the measurement accuracy.

To do this, a pulse shaper on the leading edge of the burst pulses, a pulse shaper on the falling edge of the pulses are entered into the device, a key whose input is combined with the inputs of the said shapers and a delay line and is connected to the output of the pulse-shaper with a normalized front, trigger and time delay element, one input which is combined with the trigger input and enabled on the output

the pulse former on the falling edge of the burst pulses, the other is connected to the output of the pulse former on the leading edge of the burst pulses, and the output is connected to

the second trigger input; the OR circuit, the input connected to the output of the delay line, the waiting multivibrator connected to the output of the key, and the prohibition circuit, one input of which is combined with the control input of the key

and connected to the output of the OR circuit, and the second is connected to the output of the standby multivibrator, with the output of the inhibiting circuit connected to the input of the transducer.

FIG. 1 shows a diagram of the proposed device; in fig. 2 - output voltage diagrams for the corresponding elements of the device.

The device consists of a shaping device 1

bursts of pulses with normalized front duration, delay line 2, logic circuit OR 3, multivibrator standby 4, prohibition circuit 5, driver 6 pulses on the falling edge of the bursts,

driver 7 pulses on the falling edge of the pulse of the pack, trigger 8 with separate inputs, time delay element 9, digital converter 10 "time interval - code and key 11.

The measured bursts of pulses are fed to the driver of 1 pulses of bursts with normalized fronts duration, for example, a Schmidt trigger, where they form at a selected level Uo into rectangular pulses that are equal in duration to the duration of the input pulses. From the output of the imaging unit 1, the pulses arrive at the digital converter "time interval-code through delay line 2, logic circuit OR 3 and prohibition circuit 5, and the pulses at the output of the prohibition circuit 5 do not overclock in the TC only after the pulse from the waiting multi-vibration 4 ends which is triggered by the first output pulse from driver 1 through key 11. Prohibition circuit 5 subtracts from the duration of the pulse generated at the output of the circuit OR 3, the duration of the pulse generated by the waiting multivibrator 4. C Part II opens for a time equal to the delay time of line 2, after which it is blocked by a signal from the output of the circuit OR 3. Simultaneously with the arrival of pulses at key 11 and delay line 2, pulses form on the leading edge of the driver 6 and on the rear edge of the driver 7. the driver 7 transfers to the second steady state the trigger 8, which is initially reset to the initial state when the entire device is turned on. The signal from trigger 8 enters the OR 3 circuit, at the output of which a pulse is formed. Trigger 8 is reset to the initial state by the signal from time delay element 9, which is triggered on the falling front. The pulses of the bursts from the driver 7. The switching time of the trigger 8 is selected based on the preset emissivity of the emulsions. The time delay element 9 is returned to the initial state during the arrival of the burst is carried out by the leading edges of the burst pulses through the imaging unit 6. At the moment of terminating the burst of impulses, the time delay element 9 is working out of the specified time interval and the trigger 8 is returned to the initial state.

The voltage drop from the OR circuit 3 spawns to flow through the inhibitor circuit 5 to the digital time-to-digital converter 10, and the measurement process ends.

Claims (2)

1.F. A. Truben, G. E. Brutman and A. I. Trest. "Measurement of time intervals in telephony," Link. Moscow, 1968, pp. 49-52. 2. Avt. St. 311244, M.C. G 04F 10/00 dated 11/17/71 (prototype). sh. V, ex. V --i