JPH0282127A - Temperature measuring instrument - Google Patents

Abstract

PURPOSE:To accurately measure temperature by providing two thermocouple measuring wires where induced noise components have the opposite polarities, and adding and inputting signals from the thermocouple measurement wires to the measuring instrument. CONSTITUTION:The two thermocouple measurement wires 11 and 12 consists of positive-side measurement wires 11a and 12a and negative-side measurement wires 11b and 12b, and their one-terminal sides contact a measurement position 13. Further, the measurement wires 11 and 12 are so arranged that the measurement wires 11a and 12b, and measurement wires 11b and 12a at the same positions respectively so that electromotive forces induced in the measurement wires 11 and 12 are opposite in polarity when an alternating magnetic field operates. Then their outputs are added by an adder 14, integrated by an integrator 15, and recorder on a temperature recorder 16. Therefore, even when there is the alternating magnetic field which induces the electromotive forces in the measurement wires 11 and 12, noise components generated with the alternating magnetic field are removed by canceling each other, so that the accurate temperature is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) The present invention relates to a temperature M+ constant device that uses a thermocouple to determine the temperature of a desired location n1.

(Prior Art) Generally, in a temperature measuring device using a thermocouple, the temperature of the measurement site is measured by bringing the thermocouple into contact with the measurement site and measuring the DC voltage generated across the thermocouple.

FIG. 3 shows an example of such a conventional temperature measuring device, in which the thermocouple measurement line 1 is connected to the positive side (plus side) measurement line 1.
a and a negative side (minus side) measurement line 1b, one end of which is connected to the measuring device 2, and the other end is connected to A1.
1L is provided so as to be in contact with the fixed part 3.

Then, depending on the temperature of the fixed part 3, the thermocouple needle /i
The DC voltage generated in the p+ wire 1 is measured by the aFJ constant device 2, and the temperature of the measurement site 3 is measured.

(Problem to be Solved by the Invention) However, in the conventional temperature measuring device described above, an electromagnetic field, such as an alternating magnetic field, acts on the thermocouple measurement wire, and an electromotive force due to the alternating magnetic field is induced in the thermocouple needle n+ wire. and,
There is a problem in that this electromotive force is measured as a noise component, making it impossible to accurately measure temperature.

The present invention has been made in response to such conventional circumstances, and can reduce the influence of noise components induced in thermocouple measurement lines by surrounding electromagnetic fields, etc., and can measure temperature more accurately than in the past. A11j It is an object of the present invention to provide a temperature measuring device capable of determining temperature.

[Structure of the Invention] (Means for Solving the Problems) That is, the present invention provides a positive measurement line and a negative measurement line 71111.
Noise induced in a temperature measuring device that has a thermocouple wire that is made of a wire and has one end in contact with a desired measurement site, and a measuring device that measures an electrical signal from this thermocouple measuring wire. At least two thermocouple measurement lines configured such that the polarities of the components are opposite to each other are provided, and signals from these thermocouple measurement lines are added and input to the measurement device. .

(Function) In the temperature measuring device of the present invention having the above configuration, a plurality of, for example, two thermal lightning pair measurement lines are provided, each of which is configured so that the polarity of the noise component induced inside by the surrounding electromagnetic field, etc. is opposite. It is configured to add the signals from these thermocouple measurement lines and input the result to the measuring device.

Therefore, the noise component induced into the thermocouple measurement line by the surrounding electromagnetic field etc. is canceled out, its influence can be reduced, and the temperature can be measured more accurately than in the past.

(Embodiment) An embodiment of the temperature nj constant device of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a temperature measuring device according to an embodiment of the present invention, in which two thermocouple needles n1 wire 11 and 12 are connected to the positive side (plus side) total n1 wires 11a, 12a and the negative side, respectively. (Minus side) measurement line 11b 112b, one end of which is provided so as to contact the δ-j constant region 13.

In addition, when the two thermal lightning pair measurement lines 11 and 12 are subjected to an alternating magnetic field, for example, the thermal lightning pair measurement lines 11 and 12
．． 12, the positive side measurement line 11a and the negative side total δl line 12b are located at the same location, and the negative side measurement line 11b and the positive side measurement line 12a are located at the same location. These outputs are added by an adder 14, integrated by an integrator 15, and recorded by a temperature recorder 16.

That is, as shown in the graph of FIG. 2, where the vertical axis is voltage and the horizontal axis is time, the output from the thermocouple measurement line 11, for example, becomes a solid line by adding a noise component to the temperature ml constant signal as shown by dotted line A. In the case of an output like B, a noise component with a polarity opposite to that of the thermocouple measurement line 11 is generated in the thermocouple measurement line 12,
The configuration is such that an output as shown by solid line C can be obtained. Then, by adding these outputs, we obtain an output that is twice the normal temperature measurement signal as shown by the - dotted chain line, and by multiplying this by 1/2, we obtain the normal temperature signal with only the noise component removed. It is configured to obtain an A11 constant signal (dotted line A).

Therefore, for example, at the location of the thermal lightning pair aI11 line 11.12, iti
Even if an alternating magnetic field or the like exists that induces a force, the noise components generated by the alternating magnetic field can be canceled out and removed, making it possible to determine all temperatures more accurately than in the past.

Although the above embodiment describes an example in which two thermal lightning pair measurement lines 11 and 12 are provided for one measurement site 13, the present invention is not limited to this embodiment, and can be similarly configured. A similar effect can also be obtained by providing N thermocouple measurement lines 11 and 12, that is, 2N (an even number), adding their outputs, and multiplying the added value by 1/2N.

[Effects of the Invention] As explained above, according to the temperature measuring device of the present invention,
It is possible to reduce the influence of noise components induced into the thermocouple measurement line by surrounding electromagnetic fields, etc., and it is possible to measure temperature more accurately than in the past.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a temperature measuring device according to an embodiment of the present invention, Fig. 2 is a graph showing an output waveform for explaining the state of a measurement signal, and Fig. 3 is a diagram showing the configuration of a conventional temperature measuring device. FIG. 11.12・・・・・・・・・Thermocouple needle side wire 11
a, 12a... Positive side total a1 line 11b, 12b.
・・・・・・Negative side measurement line 13・・・・・・・・・・・・
......Measurement site 14...
・・・・・・・・・Adder 15・・・・・・・・・・
・・・・・・・・・Integrator 16・・・・・・・・・・
・・・・・・・・・Temperature recorder agent Patent attorney
Nori Chika Noriyuki Nobuoki Daishimaru Ken Diagram 2

Claims (1)

[Claims] (1) A thermocouple measurement line consisting of a positive measurement line and a negative measurement line, one end of which is placed in contact with a desired measurement site, and a measurement device for measuring the electrical signal from this thermocouple measurement line. A temperature measuring device having at least two thermocouple measurement wires configured such that the polarities of the induced noise components are opposite to each other, and signals from these thermocouple measurement wires are added to the temperature measurement device. A temperature measuring device configured to input data.