CN112129987A

CN112129987A - Amperemeter capable of working under strong magnetic field and strong electric field environment

Info

Publication number: CN112129987A
Application number: CN202010941788.1A
Authority: CN
Inventors: 卞景龙
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2020-12-25

Abstract

The invention discloses an ammeter capable of working in a strong magnetic field and strong electric field environment. The heat generated by the built-in electric heating wire after being electrified is absorbed by the thermometer and converted into temperature readings. And then the temperature readings are converted into current readings through a temperature current conversion module, and then current values to be measured in the volume counting circuit are counted. The electric heating wire, the thermometer and the heat effect conversion module form a current measurement working loop. The ammeter capable of working in the strong magnetic field and strong electric field environment can effectively reduce the influence of an external strong magnetic field and strong electric field on the reading of the ammeter, and the experiment precision is improved. The galvanometer which can work under the strong magnetic field and strong electric field environment is quick to operate, more accurate and convenient.

Description

Amperemeter capable of working under strong magnetic field and strong electric field environment

Technical Field

The invention relates to an ammeter capable of working in a strong electric field environment of a strong magnetic field, in particular to a simple, accurate and practical ammeter.

Background

In the current laboratory, when a traditional current meter is used for carrying out experiments, the precision of the experimental results depends on the properties of the external environment to a certain extent. Conventional galvanometers are susceptible to additional forces in the presence of strong magnetic and intense electric fields, which can cause the pointer to deviate from the correct reading. In addition, if the laboratory bench is not completely horizontal or the gravitational field in the environment is weak, the influence of the gravitational field on the traditional galvanometer is not negligible, and the initial error of the reading of the instrument is brought. Therefore, in space, the traditional galvanometer is difficult to apply.

Disclosure of Invention

The invention provides an ammeter for measuring current by using a thermal effect and a thermal expansion and contraction principle, aiming at solving the problem of reading error caused by the fact that the traditional ammeter is easily influenced by an external strong magnetic field and a strong electric field and cannot be applied in space. The thermometer reading change caused by the generated heat and the resistance value of the resistor are converted, the relationship between the temperature and the current is obtained through the relationship between the thermometer reading change and the resistance value of the resistor, and then the current is accurately measured.

The technical scheme adopted by the invention for solving the problems is as follows: the ammeter working in strong magnetic field and strong electric field environment includes outer box, binding post, heating wire, thermometer, built-in heat effect conversion module, electrothermal treatment circuit and temperature and current conversion module. When the lead wire led out from the binding post of the current meter is connected into a circuit, the lead wire and an experimental circuit form a loop. The current to be measured in the loop is recorded as I_xWhen the current I in the loop_xWhen the value of (A) is constant, heat is generated through a thermal effect circuit comprising a heating wire, and the numerical value of the heat is in direct proportion to the passing current I_x. The heat generated by the current is absorbed by the thermometer positioned therein, thereby causing the thermometer reading to change. Combining the temperature and current variation relationship measured for many times, the corresponding current magnitude at a certain temperature can be determined, and the current magnitude is equal to the current I to be measured_x. The built-in electric heating wire, the thermometer and the heat effect conversion module form a current measurement working loop.

In the above-mentioned amperemeter capable of working under strong magnetic field and strong electric field environment, the thermometer is a mercury thermometer, and its position is placed in the outer box, and its temperature reading mark is a correspondent current value according to the measured current value.

The invention has the beneficial effects that: the ammeter capable of working in the strong magnetic field strong electric field environment converts the current to be measured and the reading of the thermometer by adopting a thermal effect principle, thereby overcoming the influence of an external strong magnetic field and the reading change caused by gravity factors, enabling accurate measurement of the current in the environment of weightlessness and strong magnetic fields to be possible, reducing the measurement cost and improving the accuracy of the experiment.

Drawings

The invention is further explained below with reference to the figures and examples.

Fig. 1 is a schematic diagram of the present invention.

FIG. 2 is a design drawing of the present invention.

In the figure, 1, a shell, 2, an electric heating processing circuit, 3, an electric heating wire, 4, a temperature and current conversion module, 5, a binding post, 6, a thermometer and 7 are internally provided with an electric heating effect module.

Detailed Description

[ example 1 ]

The ammeter capable of working in a strong magnetic field and strong electric field environment comprises a shell (1), an electric heating processing circuit (2), a temperature and current conversion module (4), a binding post (5), a thermometer (6) and a built-in electric heating effect module (7). Can insert external circuit with the ampere meter through terminal (5), the electric current of external circuit produces the heat through built-in electric heat effect module (7), and the heat of production is turned into the temperature registration by thermometer (6), and the temperature registration that rethread temperature electric current conversion module (4) will be surveyed is being converted into the electric current reading, can accomplish like this and measure the electric current in the circuit.

[ example 2 ]

After the built-in electrothermal effect module (7) is electrified, the electric energy is converted into heat energy by the electric heating wire (3) positioned in the built-in electrothermal effect module, and the conversion mode meets the Joule law. When the current to be measured in the circuit is constant, the numerical value of the heat generated by the built-in electrothermal effect module (7) in unit time is in direct proportion to the temperature displayed by the thermometer (6). The mercury thermometer is adopted in the ammeter, so that the relationship between the temperature of the mercury thermometer and the current change is combined, and after the temperature is processed by the electric heating processing circuit (2), the temperature reading is converted into the current value of the circuit in the temperature and current conversion module (4).

[ example 3 ]

The electric heating treatment circuit (2), the temperature current conversion module (4) and the built-in electric heating effect module (7) adopt the principle that the heat effect is converted into current reading, and then an external strong magnetic field and a strong electric field can not influence the ammeter. The temperature current conversion module (4) directly obtains the current readings through function conversion with the temperature readings, does not need the pointer to instruct, and then has reduced the influence of gravity to the galvanometer, has improved the application range of instrument.

Claims

1. The ammeter capable of working in a strong magnetic field strong electric field environment comprises a shell (1), an electric heating processing circuit (2), a temperature and current conversion module (4), a binding post (5), a thermometer (6) and a built-in electric heating effect module (7). The method is characterized in that: can insert external circuit with the ampere meter through terminal (5), the electric current of external circuit produces the heat through built-in electric heat effect module (7), and the heat of production is turned into the temperature registration by thermometer (6), and the temperature registration that rethread temperature electric current conversion module (4) will be surveyed is converted into the current reading again and is shown, and the current numerical value corresponds with thermometer (6) liquid level registration.

2. A current meter according to claim 1, wherein said current meter is capable of operating in a high field environment, and wherein: the current meter is connected into the circuit by a binding post (5).

3. A current meter according to claim 1 or 2, capable of operating in a high field and high field environment, wherein: the heat generated by the built-in electrothermal effect module (7) comes from external current to be measured, and the generated heat is converted into temperature readings by the thermometer (6).

4. A current meter according to claim 3, wherein said current meter is capable of operating in a high field environment, and wherein: the heat generated by the built-in electrothermal effect module (7) is in positive correlation and one-to-one correspondence with the current.

5. A current meter according to claim 4, wherein said current meter is capable of operating in high field and high field environments, and wherein: the temperature readings displayed by the thermometer (6) are converted into current readings by the temperature current conversion module (4) to be displayed, and the displayed current values are the readings corresponding to the liquid level of the thermometer (6).

6. A current meter according to claim 5, wherein said current meter is capable of operating in a high field environment, and wherein: the temperature and current conversion module (4) can invert the acquired temperature data into a current value generated by the built-in electrothermal effect module (7) according to an inverse function obtained by calibrating a current and temperature function in advance.