SU947777A1 - Ds measuring ratio of two alternating time intervals - Google Patents

Description

The invention relates to a measurement technique, is intended to calculate the ratio of two alternating cych to random intervals of time, and in particular, can be used in the equipment of an acoustic well cage to measure the ratio of the periods of pulsed acoustic signals.

A device for measuring the ratio of two signals is known, comprising a charge driver, a thyristor, a discharge capacitor, two resistors, a compensation voltage source, and a meter 11.

The drawback of the device is that it provides a measurement of the ratio of ne) iodine only under the condition of T. Another disadvantage of the device is that its output parameter pulsates relative to its average value due to the non-simultaneity of the charging and discharging circuits and the uneven form of charging and discharge current pulses, which reduces the measurement accuracy.

The closest technical solution to the proposed is a device for measuring the ratio of average periods of pulse signals.

containing a DC generator, two controllable switches, a storage capacitor, a DC amplifier and a discharge resistor, the generator is connected to the control input of the first switch, the ungrounded contact of which is connected to the input of the amplifier whose negative capacitor is connected to the negative feedback circuit , and, through the resistor and the contacts of the second key, with the output of the amplifier 2.

A disadvantage of the known device is the presence in the output voltage of the instrumental pulsations caused by the non-simultaneous arrival and uneven form of charge and discharge current pulses. This leads to low measurement accuracy.

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The purpose of the invention is to improve the measurement accuracy.

The goal is achieved by the fact that the device for measuring

the ratios of two alternating time intervals 5 containing a source, a constant voltage, two keys, the control inputs of which are the inputs of the device, and a storage capacitor connected to the circuit 30

sound feedback amplifier

the constant tOKa, whose output is the output of the device, is equipped with a voltage-current converter, a buffer capacitor, a third key and a voltage inverter, the signal input contact of the first key is connected to a constant voltage source, the signal input contact of the second key is connected to the output of the inverter the voltage, the input of which is connected to the output of the dc amplifier, the output signal contacts of the first and second switches are connected to the input of the voltage-current converter, the output of which is connected to an ungrounded The pole of the buffer capacitor через through the signal contacts of the third key to the input of the DC amplifier, the control input of the second key connected to the control input of the third key via a one-shot.

FIG. 1 pr) a functional diagram of the device is introduced; in fig. 2 pulse timing diagrams.

The device consists of controlled keys 1-3, a voltage-current converter 4, a buffer capacitor 5, / a single-oscillator 6, a storage capacitor 7, a DC amplifier 8, a voltage inverter 9 and a constant voltage source 10,

A sequence of pulses of duration T (; FIG. 2, c1) is input to the control input of key 1. to the control key input 2 — the duration T / J of FIG. 2,6). At the initial moment, the output voltage of the DC amplifier 8 is Ugj || U (j. When the key 1 of the first pulse with duration T ,, comes to the control input, the key 1 connects the source 10 to the converter 4 and the buffer capacitor 5 receives charge q where k const is the voltage-current conversion factor To the control input of the switch 2 of a pulse duration T to the converter 4, the output voltage UQ is applied through the voltage inverter 9 and from the capacitor 5 is removed, charge q kU,) T. The back edge of a pulse of duration T (j starts a one-shot b, which generates a pulse of duration t - const (Fig.2.9}, the duration required to discharge the capacitor 5 to the storage capacitor 7. Under the action of the pulse Tp, the switch 3 connects

the capacitor 5 to the storage capacitor 7 / .cot y composes charge Aq q. - q kCEpT -UoT),

where iU-j is the remaining voltage on. buffer capacitor after the action of the first pair of pulses;

SL - the value of the capacity of the buffer capacitor. The action of the second pair of pulses of duration T and T i2, the capacitor 7 is charged

k (woo-t-li) T-g.

aq kEpT

where C is the value of the capacity of the storage capacitor. The action of the third pair - the capacitor 7 is charged

d4a kEoT, - + (, +

whether

J

etc., with q. aq3 The action of the i-th pair of pulses to the capacitor 7 is charged

  kEoT - + U (i -1) -T,

LA

iiM

where U (i - 1) 111 la „/ s-value

the output voltage after the action (i - a pair of pulses. The output voltage will increase under the action of the pulses until the transient process is over, i.e., condition O is fulfilled.

MI CD

After completion of the transient process, the output voltage is

and

Claims (1)

 EOTG ie linearly depends on the measured value of the duration of the pulses under study. Since after the end of the transition process aq, O, i.e. the storage capacitor does not receive charge and discharge signals, and, therefore, the output voltage of the device contains almost no arlp-ripple pulsations, which justifies the increase in measurement accuracy. Especially effectively the device can be used in cases when it is necessary to convert the output parameter into a digital code for further processing on a computer. Apparatus of the Invention A device for measuring the ratio of two alternating time intervals