SU838418A1

SU838418A1 - Temperature gage

Info

Publication number: SU838418A1
Application number: SU792834650A
Authority: SU
Inventors: Евгений Петрович Дьяков; Анатолий Иванович Чередов
Original assignee: Омский политехнический институт
Priority date: 1979-09-21
Filing date: 1979-09-21
Publication date: 1981-06-15

Description

Изобретение относится к термометрии .The invention relates to thermometry.

Известно устройство для измерения температуры, содержащее резисторный датчик, нуль-орган, генератор тактовых импульсов, ключ и блок цифровой индикации [1 ].A device for measuring temperature, comprising a resistor sensor, a zero-organ, a clock, a key and a digital display unit [1].

Однако такое устройство не обладает требуемой точностью измерения из-за погрешности, обусловленной приближенностью компенсации нелинейности характеристики резисторного датчика температуры.However, such a device does not have the required measurement accuracy due to the error due to the approximation of compensation of the non-linearity of the characteristics of the resistor temperature sensor.

. Наиболее близким к предлагаемому является устройство для измерения температуры, содержащее резисторный датчик и магазин проводимостей, включенных в мостовую измерительную схему, (снабженную источником питания, блок цифровой индикации, ключ, входы которого соединены с выходом генератора тактовых импульсов и выходом нуль-органа, включенного в измерительную диагональ мостовой схемы Однако известное устройство позволяет использовать ограниченный класс характеристик резистивных датчиков температуры и не обладает требуемой точностью измерения температуры из-за ошибки, обусловленной систематической погрешностью датчика температуры и измерительной схемы, с Цель изобретения - повышение точности измерения при одновременном расширении класса используемых резистивных датчиков температуры.. Closest to the proposed one is a temperature measuring device containing a resistor sensor and a conductivity store included in a bridge measurement circuit (equipped with a power source, a digital display unit, a key whose inputs are connected to the output of the clock generator and the output of the zero-organ included in measuring diagonal of the bridge circuit However, the known device allows the use of a limited class of characteristics of resistive temperature sensors and does not have the required accuracy and Temperature measurements were due to an error caused by a systematic error of the temperature sensor and measuring circuit, with the purpose of the invention - increasing measurement accuracy while expanding class used resistive temperature sensors.

Для достижения этой цели в устΙθ ройство введены функциональный преобразователь и два переключателя, причем нормально разомкнутые контакты первого переключателя соединены с выходом нуль-органа и с первым входом функционального преобразова15 теля, который через нормально замкнутые контакты второго'переключателя соединен с выходом ключа, и второй вход функционального преобразователя соединен с нормально разомкну20 тым контактом второго переключателя, а первый ή второй выходы функционального преобразователя соединены со входами блока цифровой индикации и магазина проводимостей соответст25 венно, причем функциональный преобразователь содержит адресный регистр, счетчики импульсов и блок памяти,’ первый вход которого соединен с выходом адресного регистра, вход которого го соединен со счетным входом перво4 wTo achieve this goal, a functional converter and two switches are introduced into the device, with the normally open contacts of the first switch connected to the output of the zero-organ and to the first input of the functional converter 15, which is connected through the normally closed contacts of the second switch to the output of the key, and the second input the functional converter is connected to the normally open contact of the second switch, and the first ή second outputs of the functional converter are connected to the inputs of the unit digital indication and conductivity store, respectively, and the functional converter contains an address register, pulse counters and a memory unit, the first input of which is connected to the output of the address register, the input of which is connected to the counting input of the primary 4 w

го счетчика импульсов и с первым входом функционального преобразователя, а выходы блока памяти соединены со входами записи' кода первого и второго счетчиков импульсов, причем выход первого счетчика соединен с первым выходом функционального преобразователя, а выход другого счетчика - со вторым входом блока памяти и со вторым выходом функционального·, преобразователя и счетный вход вто- ^:рого счетчика импульсов соединен со вторым входом функционального преобразователя.th pulse counter and with the first input of the functional converter, and the outputs of the memory block are connected to the recording entries of the code of the first and second pulse counters, the output of the first counter connected to the first output of the functional converter, and the output of another counter with the second input of the memory block and the second the output of the functional · converter and the counting input of the second ^: pulse counter is connected to the second input of the functional converter.

На чертеже показана схема предлагаемого устройства.The drawing shows a diagram of the proposed device.

Устройство содержит резисторный датчик 1 температуры, магазин 2 проводимостей, резисторы 3 и 4, источник 5 питания, блок б цифров'ой индикации, ключ 7, генератор 8 тактовых импульсов, нуль-орган 9, функциональный преобразователь 10, переключатели 11 и 12, блок 13 памяти, адресный регистр 14, счетчики 15 и 16 импульсов.The device comprises a resistor temperature sensor 1, a conductivity store 2, resistors 3 and 4, a power supply 5, a digital indication unit b, a key 7, a clock pulse generator 8, a zero-organ 9, a functional converter 10, switches 11 and 12, a block 13 memory, address register 14, counters 15 and 16 pulses.

Устройство работает следующим образом.The device operates as follows.

В режиме записи функции управления магазином 2 проводимостей в блок 13 памяти переключатели 11 и 12 находятся в положении/ противоположном показанному на чертеже. Импульсы с выхода генератора ,8 тактовых импульсов проходят через ключ 7 и переключатель 12 и заполняют.счетчик 15 им-, пульсов, выходным кодом которого управляется магазин 2 проводимостей. В момент равновесия мостовой измерительной схемы сигналом с нуль-органа 9 закрывается ключ 7, прекращая поступление импульсов в счетчик 15. Этот же сигнал через переключатель 11 поступает на вход адресного регистра 14, изменяя его состояние на единицу. В соответствующую ячейку блока 13 памяти записывается код с выхода счетчика 15 импульсов, пропорциональный значению проводимости магазина 2 в момент равновесия мостовой схемы и, следовательно, соответствующий значению температуры в данной точке диапазона измерения.Последовательно; Задавая дискретные значения температуры с шагом по температуре, не превышающем заданной абсолютной погрешности измерения, в блок 13 памяти записываются коды управления «агазином 2 проводимостей, соответствующие равновесию мостовой измерительной схемы в каждой точке диапазона измерения. В первую ячейку блока 13 памяти записывается код начального значения диапазона измерения температуры.In the recording mode of the function of managing the conductivity store 2 in the memory unit 13, the switches 11 and 12 are in the position / opposite to that shown in the drawing. The pulses from the output of the generator, 8 clock pulses pass through the key 7 and the switch 12 and fill. The counter 15 pulses, the output code of which is controlled store 2 conductivity. At the moment of equilibrium of the bridge measuring circuit, the signal from the zero-organ 9 closes the key 7, stopping the arrival of pulses in the counter 15. The same signal through the switch 11 is fed to the input of the address register 14, changing its state by one. In the corresponding cell of the memory unit 13, a code is written from the output of the counter 15 pulses proportional to the value of the conductivity of the magazine 2 at the moment of equilibrium of the bridge circuit and, therefore, corresponding to the temperature at a given point in the measurement range. By setting the discrete temperature values in steps of a temperature not exceeding the specified absolute measurement error, the control unit “conductivity store 2” corresponding to the equilibrium of the bridge measuring circuit at each point of the measurement range is written into the memory unit 13. In the first cell of the memory unit 13, the code of the initial value of the temperature measuring range is recorded.

В режиме измерения переключатели 11 и 12 находятся в положении, показанном на чертеже. При этом последовательность импульсов с выхода ге нератора 8 тактовых импульсов, поступающая через ключ 7 и переключатель 12 на первый вход функционального преобразователя 10, преобразуется в параллельный код температуры, снимаемый с первого выхода функционального преобразователя 10, и фун- ТСцию управления магазином 2 проводимостей, соответствующую характеристике датчика 1, снимаемую со второго выхода функционального преобразователя 10·In measurement mode, the switches 11 and 12 are in the position shown in the drawing. In this case, the sequence of pulses from the output of the generator 8 clock pulses, coming through the key 7 and the switch 12 to the first input of the functional converter 10, is converted into a parallel temperature code taken from the first output of the functional converter 10, and the control function of the conductivity store 2 corresponding to the characteristic of the sensor 1, removed from the second output of the functional Converter 10

Импульсами, поступающими на вход адресного регистра 14, осуществляется последовательный опрос ячеек блока 13 памяти. При нулевом состоянии адресного регистра 14 код начального значения диапазона измерения, считываемый с первого выхода блока 13 памяти, переписывается в счетчик 16 импульсов и в последующем - суммируется с количеством тактов считывания информации из .блока 13 памяти. Результат, соответствующий значению измеряемой температуры, выводится на блок 6 цифровой индикации.The pulses received at the input of the address register 14, sequentially polls the cells of the memory block 13. In the zero state of the address register 14, the code of the initial value of the measuring range, read from the first output of the memory unit 13, is copied to the counter 16 pulses and subsequently is summed with the number of clock cycles for reading information from the memory unit 13. The result corresponding to the value of the measured temperature is displayed on the digital display unit 6.

Коды функции управления магазином 2 проводимостей переписываются в счетчик 15 импульсов, с выхода которого поступают на вход магазина 2 проводимостей, что приводит к изменению значения проводимости магазина до полного уравновешивания мостовой измерительной схемы. В момент равновесия мостовой схемы сигналом с нульоргана 9 закрывается ключ 7. При этом записанный в счетчике 16 импульсов код пропорционален значению измеряемой температуры.Codes of the store management function 2 conductivity are copied to the counter 15 pulses, the output of which is fed to the input of the store 2 conductivity, which leads to a change in the conductivity of the store to fully balance the bridge measurement circuit. At the moment of equilibrium of the bridge circuit, the signal from the nullorgan 9 closes the key 7. Moreover, the code recorded in the counter 16 pulses is proportional to the value of the measured temperature.

Предлагаемое устройство позволяет повысить точность измерения за счет того, что при записи функции управления в функциональный преобразователь происходит автоматический учет систематических погрешностей датчика и измерительной схемы. Кроме того, применение Функционального преобразователя с возможностью воспроизведения любой монотонной функциональной зависимости позволяе'т расширить класс характеристик используемых резистивных датчиков.The proposed device allows to increase the accuracy of the measurement due to the fact that when writing the control function to a functional converter, the systematic errors of the sensor and the measuring circuit are automatically taken into account. In addition, the use of the Functional Converter with the ability to play any monotonous functional dependence allows you to expand the class of characteristics of the used resistive sensors.

В. случаях, когда производить запись функции управления магазином проводимостей, задавая требуемые значения температуры, затруднительно, эту операцию можно производить, задавая значения сопротивления в соответствии с известной характеристикой датчика,·подключив вместо него магазин сопротивлений. Но при этом будут учитываться не все систематические погрешности, например такие, как точность представления характеристики датчика;B. cases when it is difficult to record the conductivity store management function by setting the required temperature values, this operation can be performed by setting the resistance values in accordance with the known sensor characteristic, · by connecting a resistance store instead. But at the same time, not all systematic errors will be taken into account, for example, such as the accuracy of the representation of the sensor characteristics;

Claims

one

This invention relates to thermometry.

A device for measuring temperature is known, comprising a resistor sensor, a zero-organ, a clock pulse generator, a key, and a digital display unit l.

However, such a device does not have the required measurement accuracy due to the error due to the proximity of the measurement of the nonlinearity of the characteristic of the resistor temperature sensor.

. . The closest one to offer is a temperature measuring device comprising a resistor sensor and a conductivity store included in a pavement measuring circuit, equipped with a power source, a digital display unit, a key, the inputs of which are connected to the output of the clock generator and the zero-body output. included in the measuring diagonal of the bridge circuit 12}

However, the known device allows the use of a limited class of characteristics of resistive temperature sensors and does not have the required accuracy of temperature measurement due to an error due to the systematic error of the temperature sensor and the measuring circuit.

The purpose of the invention is to improve the measurement accuracy while simultaneously expanding the class of resistive temperature sensors used.

To achieve this goal, a functional converter and two switches are inserted into the device, with the normally open contacts of the first switch connected to the output of the null organ and to the first input of the function transducer 5, which is connected to the output of the key through the normally closed contacts of the second switch is connected to the normally open contact of the second switch, and the first and second outputs of the functional converter are connected to the inputs of the unit digital display and conductivity store, respectively, where the functional converter contains an address register, pulse counters and a memory block / first input of which is connected to the output of the address register, whose input is connected to the counting input of the first pulse counter and the first input of the functional converter, and the outputs of the memory unit are connected to the inputs for recording the code of the first and second pulse counters, the output of the first counter being connected to the first output function converter, and the output the other counter — with the second input of the memory unit with the second output of the functional unit; the converter and the counting input of the second pulse counter are connected to the second input of the functional converter.

The drawing shows a diagram of the proposed device.

The device contains a resistor temperature sensor 1, a store of 2 conductivities, resistors 3 and 4, a power source 5, a digital display unit b, a key 7, a generator of 8 clock pulses, a null organ 9, a functional converter 10, switches 11 and 12, a memory block 13 TI, address register 14, counters 15 and 16 pulses.

The device works as follows.

In the recording mode, the control function of the conduction magazine 2 in the memory unit 13 of the switches 11 and 12 is in the opposite position of the Y in the drawing. The pulses from the generator output, 8 clock pulses pass through the key 7 and the switch 12 and fill, the counter, 15 pulses, the output code of which is controlled by the store 2 of conductivities. At the moment of equilibrium of the bridge measuring circuit, the signal from the zero-organ 9 closes the key 7, stopping the flow of pulses into the counter 15. The same signal through the switch 11 enters the input of the address register 14, changing its state by one. The code from the output of the pulse counter 15 is proportional to the conductivity value of the store 2 at the moment of equilibrium of the bridge circuit and, therefore, corresponding to the temperature value at this point of the measuring range. Setting discrete temperature values with temperature increments not exceeding the specified absolute measurement error, at Slak 13, the memory of the storage program contains control codes for the 2 conductivities store corresponding to the equilibrium of the bridge measurement circuit at the point of the measuring range. The first cell of the memory block 13 records the code of the initial value of the temperature measurement range.

In the measurement mode, the switches 11 and 12 are in the position shown in the drawing. In this case, a series of pulses from the generator output 8 clock pulses, fed through the switch 7 and the switch 12 to the first input of the functional converter 10, is converted into a parallel temperature code, taken from the first output of the functional converter 10, and the store control function 2 conductivities corresponding to the characteristics of sensor 1, taken from the second

Q output of the functional transform, atel 10.,

The pulses arriving at the input of the address register 14 are sequentially polling the cells of the memory block 13. In the zero state

the address register 14, the code of the initial value of the measurement range, read from the first output of the memory block 13, is rewritten into the counter 16 pulses and subsequently summed with the number of read cycles

information from .block 13 memory. The result corresponding to the value of the measured temperature is displayed on the digital display unit b.

5 The codes of the control function of the conductivity shop 2 are rewritten into a pulse counter 15, from the output of which the conductivity input 2 enters the input of the shop, which leads to

Q is the store conductivity value until the bridge metering circuit is fully balanced. At the moment of equilibrium of the bridge circuit, the signal from the null-organ 9 closes the key 7. With this, the code recorded in the counter 16 impulses of the first code is proportional to the value of the measured temperature.

The proposed device allows to improve the measurement accuracy due to the fact that when recording the control function to the functional transducer, the systematic errors of the sensor and the measuring circuit are automatically taken into account. In addition, the use of a functional converter with the ability to reproduce any monotonous functional dependence allows us to extend the class of characteristics of the used resistive sensors.

V. In cases where it is difficult to record the control function of the conductivity store, setting the required temperature values, this operation can be performed by giving the resistance value in accordance with the known characteristic of the sensor, connecting the resistance box instead. However, not all systematic errors will be taken into account, for example, such as

0 1 accuracy of sensor performance; - Formula, inventions

. 1. A temperature measuring device comprising a resistor

a sensor and a store of conductivities included in a mortovuto measuring circuit supplied with a power source, a digital unit, an indication, a key whose moves are connected to the output of a clock generator and an output to a null organ included in the measuring diagonal of a bridge circuit, characterized in that increase the accuracy of measurement and expansion of the class of sensors used; a functional converter and two switches are inserted in it, with the normally open contacts of the first switch connected to the zero output l-organ and with the first input of the functional converter, which through normally closed contacts of the second switch is connected to the key output, and the second input of the functional converter is connected to the normally open contact of the second switch, and the first. and second outputs of the functional converter are connected to the inputs of the digital display unit and store conductance, respectively.

2 .. The device according to claim 1, which is that the functional converter contains an address register, pulse counters and blocks, the first of which is connected to the output of the address register whose input is connected to the counting INPUT of the first pulse counter and with the first input of the functional converter, and the outputs of the memory unit are connected to the inputs of the code entry of the first and second pulse detectors, the output of the first counter being connected to the first output of the functional converter, and the output of the other counter from the second The input of the memory unit and with the output of the functional converter and the counting input 5 of the second pulse counter are connected to the second input of the functional converter,

. Sources of information 0 taken into account in the examination

1. USSR author's certificate No. 619809, class C 01 K 7/16, 09/27/76.,

5 2. Netrebenko K.A. and others. Analog-to-digital converters for resistor sensors. M., Energie: 1975, p.83 (prototype).

- I