SU1118871A1 - Temperature measuring device - Google Patents

Abstract

DEVICE TDPA TEMPERATURE MEASUREMENT, containing a thermal converter connected to the input of a time-pulse converter, the output of which is connected to a counter, a memory unit and a display unit, which is entered into it in order to improve speed the code register, the address driver and the adder, the code of which is connected to the display unit, a. the inputs are respectively connected to the outputs of the code register and the memory block, with this counter outputs connected to the code register inputs and connected to the memory block inputs via the address generator. V) with

Description

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This invention relates to temperature measurements, namely, devices for temperature measurement with correction of non-linearity of a temperature transducer and can be used for precise temperature measurements with the result represented in digital form. A temperature measuring device is known, which contains a thermal converter connected to the input of an analog-digital converter, the output of which is connected to a memory unit, an indication unit. In this device, each value of the signal at the output of the analog-digital converter is set to correspond to a certain temperature value recorded in the cells of the memory block m. However, this device does not provide high accuracy of measurement in a wide range of temperatures, since it requires a large amount of memory block to obtain high accuracy. Closest to the proposed technical entity is a device for temperature measurement containing a thermocouple, connected to the input of a time-pulse converter, the output of which is connected to a counter, a memory unit and a display unit, as well as a binary counter, the input of which is connected to the output-time pulse converter, and the output through the memory unit is connected to the address inputs of the counter 2.J. A disadvantage of the known device is the low speed, since two measurements are necessary for one temperature measurement and the conversion cycle: one to determine the area of the measuring range, and the other, to correct. In addition, to ensure high measurement accuracy in a large interval of measured temperatures, it requires a large volume of the memory block, which greatly complicates the device and also reduces its performance. The purpose of the invention is to increase the speed of operation, as well as to simplify the device and increase its reliability while increasing the range of measured temfefepaTyp. This goal is achieved by the fact that a register of a pulse converter, the output of which is connected to a counter, a memory unit and a display unit, is entered into a temperature measuring device containing a thermoconverter connected to the input, a code register, an address generator and an adder whose output is connected to a display unit and the inputs are respectively connected to the outputs of the code register and the memory block, while the meter outputs are connected to the code register inputs and connected to the memory block through the address generator. The drawing shows a block diagram of the proposed device. The device contains a thermal converter 1, for example, a thermoelectric converter, a pulse converter 2 that converts the output signal of the thermal converter into a pulse sequence, a counter 3, a code register 4, an adder 5, an indication unit 6, an address driver 7 and a memory unit 8. The address shaper 7 is a number-searching device on a number axis that allows you to associate with the groups of possible states of its inputs the only states of its outputs for each group. One of the possible schemes of the address driver is shown in the drawing. The former contains a permanent recording device, a commanding device (ROM) 9, a coincidence circuit 10, an OR circuit 11, and an address counter 12. The device works as follows. The entire range of measured temperatures is divided into n subranges of approximation sites. The number of plots n is determined exactly by the required temperature measurement. The boundaries of the approximation sections are made dependent on the code of the number recorded in the counter 3, which is determined by the value of the measured temperature. In memory block 8, for each plot of approximation, codes of numbers are written which must be added to the code of the number recorded in counter 3 in order to obtain a linear dependence of the output signal on temperature. When measuring the temperature, the output signal of the thermoconverter converts the time of the pulse converter into a sequence of pulses that arrive at the counter input 3 of the counter.

From the output of the counter, the code of the number corresponding to the measured temperature is fed to the code register and to the input of the Address Shaper, which determines the number of the approximation segment. According to the signal from the address code generator 7, the memory block 8 allocates the code of the number that must be added to the number written in the code register to obtain a linear dependence of the output signal on the measured temperature. The adder 5 sums up the codes of the numbers from the output of the register and the memory block. The result of the cz mimization is displayed by the display unit 6.

The address builder operates as follows.

In ROM 9, the address maker stores codes, boundaries of approximation portions. In the zero state of the address counter 12, the boundary code of the first approximation area is formed at the outputs of the ROM 9. (With the start of the operation cycle, the counter 3 is in the zero state, so the output potential of the logic element 11 is set to zero, corresponding to the logic zero. The installation input of the address counter 12 sets it to the zero state. With the further counting of pulses by the counter 3, its output code is fed to the inputs of the circuit 10, and if the input shoe and the code of the ROM 9 match, the circuit Deni generates a signal, increases

: state of the counter 12 addresses on, one. At the same time, this signal arrives at the input of the ROM 9, and you: the course of the next segment boundary code appears at the input (xymations. If this code coincides with the code generated by counter 3, the coincidence circuit again produces a signal that increases the state of address counter 12 per unit, and so on until the end of the measurement cycle.At the beginning of the next measurement cycle, the counter 3 is zeroed, respectively, the address counter is reset and the measurement cycle is repeated.

The application of the invention improves the speed of the device, as well as the use of a memory block with a smaller volume, provided that the measurement accuracy is the same, which in turn leads to a simplification of the device and an increase in its reliability with a large temperature measurement range.

Claims (1)

a developer connected to the input of a time-pulse converter, the output of which is connected to a counter, a memory unit and an indication unit, which is ensured by the fact that, in order to improve performance, a code register, an address generator, and the adder, the input of which is connected to the display unit, and the inputs are respectively connected to the outputs of the code register and the memory unit, while the outputs of the counter are connected to the inputs of the code register and are connected to the inputs of the memory unit through the address generator. In ω s: