SU661269A1

SU661269A1 - Temperature measuring device

Info

Publication number: SU661269A1
Application number: SU772493990A
Authority: SU
Inventors: Зиновий Ярославович Монастырский; Владимир Иванович Пуцило
Original assignee: Львовский Ордена Ленина Политехнический Институт
Priority date: 1977-06-02
Filing date: 1977-06-02
Publication date: 1979-05-05

Description

(54) УСТРОЙСТВОДЛЯ ИЗМЕРЕНИЯ ТЕМПЕРАТУРЫ(54) DEVICE FOR TEMPERATURE MEASUREMENT

Изобретение относитс к те.мпературньш измерени м, а именно к цифровым устройствам дл измерени температуры с коррекцией нелинейности датчика температуры.The invention relates to temperature measurements, namely to digital devices for measuring temperature with correction for non-linearity of a temperature sensor.

Известно устройство дл измерени тем,пературы с коррекцией нелинейности датчика температуры, содержащее два цифроаналоговых преобразовател , нуль-орган, ключевое устройство 1.A device is known for measuring those with a correction of non-linearity of a temperature sensor, which contains two digital-to-analog converters, a null-organ, a key device 1.

Известно устройство дл измерени температуры с коррекцией нелинейности датчика температуры, содержащее аналого-цифровой преобразователь, счетчики импульсов схему.сравнени 2.A device for measuring temperature with correction of non-linearity of a temperature sensor, comprising an analog-to-digital converter, pulse counters of circuit comparison 2, is known.

Однако такие устройства сложны.However, such devices are complex.

Из известных устройств наиболее близким к изобретению по технической, сущности вл етс устройство дл измерени температуры , содержащее преобразователь температуры , подключенный к входу функционального преобразовател , аналого-цифровой преобразователь, соединенный с..блоком управлени и блок индикации 3.Of the known devices, the closest to the invention in technical terms is a temperature measuring device comprising a temperature transducer connected to the input of a functional converter, an analog-to-digital converter connected to the control unit and the display unit 3.

Но известное устройство отличаетс низкой точностью измерени в св зи с тем, что погрешность функционального преобразовател полностью входит в погрещность измерени .But the known device is characterized by low measurement accuracy due to the fact that the error of the functional converter is fully included in the measurement error.

Цель изобретени - повыщение точности измерений,The purpose of the invention is to increase the accuracy of measurements

Поставленна цель достигаетс тем, что в устройство введены цифровое делительное устройство и переключатель, входы которого соединены соответственно с выходом преобразовател температуры и с выходом функционального преобразовател , а выход,- с входом аналого-цифрового преобразовател , выход которого через цифровое делительное устройство соединен с блоком ин-. дикации, причем управл ющий вход переключател соединен с блоком управлени .The goal is achieved by introducing a digital dividing device and a switch into the device, the inputs of which are connected respectively to the output of the temperature converter and to the output of the functional converter, and the output, to the input of the analog-digital converter, the output of which through the digital dividing device is connected to the unit -. reading, with the control input of the switch connected to the control unit.

На чертеже-представлена схема устройства .The drawing is a diagram of the device.

5five

Устройство дл измерени температуры содержит преобразователь 1 температуры, функциональный преобразователь 2, переключатель 3,аналого-цифровой преобразователь 4, блок управлени 5, цифровое де0 . тительное устройство 6, блок индикации 7.The device for measuring temperature contains a temperature converter 1, a functional converter 2, a switch 3, an analog-digital converter 4, a control unit 5, a digital de0. Heavy device 6, display unit 7.

Claims

The device works in two cycles. In the first cycle of operation, switch 3 is in position 1 .. - A signal C arrives at the input of the functional converter 2 from the output of temperature converter 1, which nonlinearly depends on temperature and, P (c) av –b (I) where in - temperature; a, c are constant coefficients. The functional transducer has a transform characteristic inverse to the transducer characteristic of the temperature transducer. Voltage Ua. from the output of the functional converter, proportional to the temperature Uz KiFMO) K | a, (2) where Ki is a constant coefficient, is fed to the input of the analog-digital converter 4, is converted to the Ni number and then recorded in the register of the digital dividing device 6. N, 1 + KiKae, (3) where 1 is the additional insertion into the discharge of register integer numbers; Kg is the transfer coefficient of the analog-to-digital converter. In the second cycle, switch 3 is set to position P. The voltage from the output of the temperature converter is fed to the input of the analog-digital converter, converted to the number Nj, and supplied to the second input of the digital dividing device. Nz KaUi akgv + vkx © (4) The digital dividing device 6 performs the operation of dividing the second number by the first and issuing the quotient to the display unit. The coefficients K |, Ka satisfy us-. K, K , 4 Jik ak2v MII -i-k, Kg Q Introduction to the device of the new elements of the digital voltage divider and switch allows several times to reduce the error of the functional converter that is part of the error of the entire device. The device for temperature measurement has a high accuracy of temperature measurement with a relatively low accuracy and stability of the liberizing functional converter, which allows reducing the requirement for accuracy and stability of the functional converter used. An apparatus for measuring temperature, comprising a temperature transducer connected to the input of a functional converter, an analog-to-digital converter connected to a control unit and a display unit, characterized in that, in order to improve the measurement accuracy, a digital separator and a switch are introduced into it whose inputs are connected respectively to the output of the temperature converter and to the output of the functional converter, and the output to the input of the analog-digital G1 conversion ate digital output is through a dividing device connected to bloko.m indication, the control input of the switch connected to the control unit. Sources of information taken into consideration in the examination 1. USSR author's certificate No. 502237, cl. G 01 K 7/16, 1974.

2. USSR author's certificate number 559131, cl. G 01 K 7/16, 1975.

3. USSR author's certificate number 408170, cl. G 01 K 7/12, 1972.