SU1420388A1 - Device for measuring mean temperature - Google Patents

Abstract

The invention relates to temperature measurements. The purpose of the invention is to increase the speed and simplify the device. For this, a device containing p thermocouples 1, switch 2, analog-to-digital converter (ADC) 3, element 4, counters 5 and 6 pulses, register 7, generator 10 of the reference frequency, impulse distribution block 9 and pulse counter 8 pre-installation. The switch 2, in accordance with the commands issued from the output 9.1 of the pulse distribution unit 9, sequentially connects to the input of the ADC 3 thermal converters 1 located at different points of the test object. The A / D converter converts the signal of each thermal converter to a time interval that is applied to one of the inputs of the AND 4 element, to the other input of which pulses are generated at the output of the counter 8, with a frequency equal to the frequency of the generator 10 divided by the number previously recorded on the control input counter 8. During one complete measurement cycle, the input of counter 5 receives a certain number of pulses, which the element 4 will pass through during the time set by the ADC 3. Registered in counter 5 during this time ETS pulses will correspond to the average value of the temperature of the object. 2 Il. i (i

Description

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The invention relates to temperature measurements and can be used to measure the temperature fields of powerful: 1-mecromeha AI and X units.

The aim of the invention is to improve the speed and simplify the device.

FIG. 1 shows a structural diagram of the proposed device; FIG. 2 - eiyuru voltage at the outputs of the block of distribution of clock pulses.

The device contains p thermo-formers 1, switch 2, ADC 3, logic element 4, first 5 and second 6 pulse counters, |) its)) 7, counters 8 pulses with presetting, block 9 ras) pulses of impulses n generator 10 reference frequency.

The device works as follows.

Commutation) p 2 according to commands issued from output 9.1 of block 9 (Fig. 2), successively. ibno connects to the input of the ADC 3 thermocouples 1, located at different points of area 1, control unit. A / D converter 3 converts the signal of each thermal converter at a time of a duration of 7 x / ((1, 2, ..., n). Which is fed to one lit of the inputs:) Lemept I 4, to the other | The second input of which is received by the emulsions produced on B1 on the input of counter 8, with a frequency equal to the frequency of the generator 10 (/ o) divided by the number, precede.: 1Х1о recorded on the control input of the counter 8. This number is equal to n, if all thermal converters. Gakim way, for one complete measurement cycle (Гциль I У (.д from the counter 5 arrives) to food; 1 number of impulses which element And 4 will sound through time

7X XX. installed by APP 3. Register-.

In the meantime, the number of imps, measured in the counter for the first time, will correspond to the average value of the object.

The number of n. Pre-recorded in the counter 8 is formed as follows. At the beginning of each nodecycle, when enie inputs of APP 3 are not connected to the outputs of switch 2 (the signal at output 9.3 is absent), i.e., during pauses between two dimensions, the output at output 9.2 of block 9 is impulses (L- ..) ) enters through the circuits of thermal transformation.1 to the counting input of the counter fi. As soon as all chains of all n are thermoconverted. drink, then for T, in counter 6 the digit n will be recorded, which will be transferred to the command from output 9.5 of block 9 (impl. L .u) and the transistor 7 is transmitted to the input of the counter 8. Thereafter, the L / IM pulse from output 9.4 of block 9 carries out the information contained in counter 6 is erased, thus preparing the circuit for the next cycle: 1y. A temporary JQ TQ interval to control. ADC 3 for each sub0

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the cycle is produced at the output 9.3 of block 9 (pulse and tp}.

With a break of m of the n circuits of thermocouples in the counter 6, the pulses are written (n - m). In this case, the frequency of the pulses at the output of the counter 8 will be equal to / o / yy - t and the counter 5 will register the average temperature for (n-br) points.

Block 9 is a conventional ring counter with a decoder and immersion formers. At its output, pulses are formed by the sequence shown in FIG. 2

The invention provides a simplification of the ysct (JICtA, as well as increased reliability. This is achieved due to the fact that frequency division is done by one counter, register and counter with pre-registration instead of three counters, register, multiplexer and comparison unit to (; Dov v In addition, in the prototype, a special device is needed, an external device for detecting the integrity of the circuits of thermal converters. In the proposed device, this is accomplished without the use of special blocks.

The speed of the device is approximately doubled, which is achieved through the use of defining the integrity of the measurement iodocycle circuits, whereas in the prototype an additional time interval is required for this to work.

Claims (1)

Invention Formula A device for measuring the average temperature, containing the thermal converters connected via a switch to the inputs of the analog-digital converter, the element I, the first input of which is connected to the output of the analog-digital converter, and the output connected to the input of the first pulse counter, the generator frequency, the second pulse counter and register, characterized in that, in order to improve speed, a pulse distribution unit and a pulse counter with an initial setting, the output of which is connected to The first input of the element is And, the first input is connected to the output of the register, and the second input is connected to the output of the reference frequency generator and the input of the pulse distribution unit, the first, second and third outputs of which are connected respectively to the control input of the switch, the first and control inputs of the analog-digital converter, the second input of which is connected to the counting input of the second counter, the output of which is connected to the register input, and the control input is connected to the fourth output of the pulse distribution unit, the fifth output of which By connecting to the control input of the register. R cycle 9.3 Go 9.5 % 2 P fl