SU945982A1 - Measuring converter of short time intervals into code - Google Patents

Description

one

The invention relates to a radio measuring technique and can be used in precision transducers Bf) eMeHHux of parameters of pulse signals into a code.

A device is known with which it is possible to measure the time intervals of the nanosecond range to the disadvantages of the known device include high hardware costs, or low measurement accuracy.

The closest in technical essence is a recirculation converter time-code of the nanosecond range containing the OR element, one input of which receives a measured pulse, and the output of the ICH element connected to the input of the first delay element, the output of which is connected to the input of the And element and to the input The second delay element, and the output of the second delay element is connected to the second input of the And element,

2

the output of which is connected to the pulse counter and to the second input of the element

Or from.

The disadvantage of this converter is its low speed. Measurement time. A terminal with a duration of ty can be estimated using the inequality, where p D / 4T, alT is the delay provided by the second delay element, or quantization step, the measurement time is much longer than the duration of the measured time interval.

The purpose of the invention is to increase the measurement speed.

Claims (2)

The goal is achieved by the fact that the meter containing the OR element, a counter, two delay elements, an input and an output of the first delay element are connected to the first and second inputs of the AND element, respectively, and two differentiating circuits, an RS trigger and an AND element, are added. the input of the additional element AND is connected to the input of the meter and the output is connected to the input of the counter and the first input of the OR element, the output of which is connected to the input of the first delay element directly and through the first differentiating circuit to one from the RS-flip-flop inputs, another input of which is connected to the output of the second differentiating circuit, whose input is connected to the output of the AND element directly and to the second input of the OR element through the second delay element, the RS-flip-flop output is connected to the second input of the additional I element. 1 is a block diagram of a converter; in fig. 2 is a diagram of his work. The Converter contains the elements And 1 and 2, the element OR 3, the elements 4 and 5 of the delay, differentiating K5-circuit 6 and 7, RS-trigger 8, the counter 9 pulses. The measured pulse arrives at the element And 1, (Fig. 20) with, at,. another input of its present is the level of the logical unit (Fig. 26), coming from the output of trigger 8 and allowing passage of the measured pulse to the input of the element OR 3. From the output of the element OR 3 (Fig. 2 t), the measured pulse arrives at the input of the element AND 2 to the input of the delay element 5, which provides a delay for the time interval dT. At the output of element 2, after a time interval LT, from the beginning of the interval of the pulse duration tj, there appears a short pulse (Fig. 2e), which goes to the differentiating circuit 6 and changes the state of the trigger 8 to the opposite, at which level logical zero comes from its output to the input element AND 1 and prohibits the passage of the measured pulse to the input of the element OR 3 (Fig. 28), while a logical O appears at the output of the element OR 3, which limits the duration of the short pulse at the output of the element AND 2. A short pulse from the output of element 2 I is delayed by the k element of the delay for the time interval dTg (dTo lTx) and arrives at the input of the element OR 3 (Fig. 2e), from the output of which the short pulse arrives at the input of the differentiating circuit 7 and changes the trigger 8 on the opposite, while at its output appears logical 1 which allows the passage of the measured pulse to the input of the element OR 3 through the element 1. After a time interval dT from the moment of passage of the measured pulse at the output of the element 2 again is coro a strong pulse and the process is repeated until the duration of the measured pulse at the output of the element OR 3 becomes less than the value of the time interval dT. Counter 9 reads positive pulses from the measurement. At the end of the counting process, the number of pulses dT is recorded in the meter. + dT where the resolution of the elements is AND 1 and 2, the element OR 3 and the trigger 8. If the delay value, then the measuring transducer has a systematic negative error equal to the resolution resolution tpclj, the duration of the transformed interval tv, (N) dT, where Nij, -Y The proposed converter of short time intervals into a code has a high measurement accuracy at low hardware costs. AT ; The quality of the delay elements is used by the segments of the radio cable, which make it possible to easily change the quantization step, i.e. rebuild the converter. The invention of the measuring transducer of short time intervals into a code containing an OR element, a counter, two delay elements, an input and an output of the first delay element are connected to the first and second inputs of the AND element, respectively, in order to increase the measurement performance He additionally introduced two differentiating circuits, RS-trigger and element And, the first input of an additional element And connected to the input of the meter, and the output - to the input of the counter and the first input of the element JW, the output of which connected to the input of the first delay element directly and through the first differentiating circuit to one of the inputs of the RS flip-flop, the other input of which is connected to the output5 9 5982Л house of the second differentiating chain. Sources of information the entrance of which is connected to the output of the elec- tions taken into account during the examination ment and directly to the second1. Ye. A. Meleshko. Integral circuits of the element OR through the second element in the nanosecond nuclear delay time, output of the RS flip-flop. Ayumizdat, 1977, p. 138-1 0 connected to the second input of add-2. Copyright certificate of the USSR telny element I.N., cl. G 04 F 10/0, 1978. Fig. /