SU901846A1 - Device for measuring temperature - Google Patents

Description

(54) DEVICE FOR TEMPERATURE MEASUREMENT

I

The invention relates to temperature measurements and can be used for accurate temperature measurements with numerical results.

A device for measuring temperature, built on the principle of time-pulse conversion with analog correction of non-linearity of a thermal sensor, contains a temperature converter connected to an input of a functional converter via a switch connected to an analog-digital converter whose output is connected to an input of series-connected separator and display unit , the control unit, one of the outputs of which is connected to the control input of the switch, and the second - with one of the in Analog-to-digital converter l.

The disadvantage of this device is a narrow range of

functional transformations, and, therefore, low measurement accuracy, as well as the comparative complexity of the construction and configuration of analog functional converters.

Closest to the present invention is a device for measuring temperature, comprising a temperature sensor connected in series, a temperature sensor signal converter in a time interval, and a key, connecting via controllable:; the frequency divider of the counting pulses generator with a binary-decimal counter, wherein the control input of the controlled frequency divider is connected by means of a decoder to the output of the binary-fraction counter f2j.

Claims (2)

The disadvantage of the known device. the accuracy is low due to the complexity of implementing a highly accurate controlled frequency divider. 39 The purpose of the invention is to improve the accuracy of measurement. This goal is achieved by the fact that a temperature measuring device for connecting a downstream temperature sensor, a signal converter of the temperature sensor into the time interval and a key connecting the counting pulse generator with a binary counter, the output of which is connected to the input of the digital display unit, is entered memory and an additional binary counter connected in parallel to the input of a binary counter, whose information input is connected to the information output through a memory block nit.elnogo binary counter, the figure is a block diagram of an apparatus for measuring temperature. The device contains a thermal sensor 1 connected in series, a sensor 2 output signal of the thermal sensor in the time interval key 3, connecting the generator 4 counting pulses with a binary-decimal counter 5, and a digital display unit 6, parallel to the input of the binary-decimal counter 5 an additional binary counter 7, the information output of which is connected to the address input of the memory block 8, the information output of which is connected to the information input of the binary-ten counter 5, bots as follows. The output signal of the temperature sensor is converted into a time interval controlling the operation of the switch for the passage of pulses from the generator of counting pulses to binary and binary-ten counters. The number of pulses counted by the counter 7 determines the address in a block of 8 memory. Under each address of the memory block, a number is recorded corresponding to the deviation of the conversion function from linear at that point. From the output of the memory block, this number is set in the counter 5, which starts counting with the number corresponding to the corrective number of pulses. The use of additional elements — a binary counter and a memory block — makes it possible to increase the measurement accuracy of the proposed device. The limitation of the measurement accuracy in the known device is due to the complexity of the implementation of the controlled frequency divider, which especially affects the large non-linearity of the thermal sensor and the need for a large number of approximation nodes. In the proposed device, the number of approximation nodes is determined by the volume of the memory block, which for modern permanent microelectronic memory devices is in the worst case several hundred bytes. In addition, the device is much simpler, which makes it cheaper to manufacture and customize. Apparatus of the Invention A device for measuring a temperature, comprising a series-connected temperature sensor, a temperature sensor signal converter in a time interval, and a key connecting a counting pulse generator with a binary number sensor, the output of which is connected to an input of a digital display unit, characterized in that , a memory block and an additional binary counter, connected in parallel with the input of a binary-decimal counter, are entered into the device, the information input of which is via b The memory box is connected to the information output of the additional binary counter. Sources of information taken into account during the examination 1. USSR author's certificate No. 665217, cl. G 01 K 7/20, 1977. 2.Kulikovsky K.L. and others. The method of calculating the digital linearization scheme of the conversion function of measuring devices. - Instruments and control systems, 1978, No. 8, p. 22-24 (prototype) / L