SU920404A1 - Device for measuring temperature - Google Patents

Description

(54) DEVICE FOR TEMPERATURE MEASUREMENT

I

Izofethene refers to the technique of the Mershch temperatures and can be used by B devices for adjusting and controlling the temperature.

Temperature measurement devices are known in which the sensing element is made of a material with a magnetic permeability 1 dependent on temperature.

The disadvantage of these devices is a narrow range of measured TeNmureur, the inability to continuously adjust the temperature when using them in the control devices.

A device for measuring temperature is known, comprising a core with a temperature-dependent magnetic core; permeability and the receiving and magnetic coils included in the electric measuring circuit 2 placed on p & l.

The disadvantages of this device are a narrow range of intended temperatures and low accuracy.

The purpose of the invention is to expand the range of measured temperatures and increase accuracy.

This goal is achieved by the fact that in the device the core is made of a rare-earth orthoferrite single crystal oriented with an axis parallel to the axis of the 1-magnetising coil.

The technical essence of the proposed device is that

10 in a rare-earth orthoferrite single crystal in the temperature range of spin reorientation, the direction of the easy magnetization axis varies from a-axis to C-axis of the crystal.

15

The device works as follows.

When the core temperature is less than the lower limit of the interval of spin reorientation of the material, the axis of the lung

Claims (2)

20 magnetizing an orthofer single crystal, Rita is directed along the a-axis, i.e., the perpendicular to the magnetic field created by the magnetizing coil, while the signal in the receiving coil is not induced. -sie In this case, a signal proportional to the projection of the vector of the total magnetic moment of the core to the direction of the magnetic field is induced in the coil. The choice of the rare earth orthoferrite single crystals as the material for the graycutch. ÐPX PeOj, gae R are rare-earth metals. I are residual rare-earth elements, X is the formula coefficient varying from 0.5 to 0, 95, due to the fact that a sufficiently wide temperature range, the direction of the easy magnetization changes by 90 °. This leads to a linear dependence of the signal in the receiving coil on temperature. The range of signal linearity for various orthoferrites varies from -7 ° C. Using various orthoferrates as cores, it is possible to block the diatuzon from 4.2 K to. The pickup coil, made of two opposite coils, allows setting the initial signal level, and changing the signal frequency allows changing the sensitivity of the device. The proposed device makes it possible to measure temperature in a wide range and with higher accuracy than known devices of a similar type. Apparatus of the Invention A device for measuring temperature, comprising a core with a temperature-dependent magnetic permeability and receiving and 1 magnetic coils placed on it in an electrical measuring circuit, characterized by the fact that, in order to expand the range of measured temperatures and improve accuracy, the core is It is made of rare-earth mono-crystal orthofer, oriented with-axis parallel to the axis of the magnetizing coil. Sources of information, 1 dein t into consideration during the examination 1. The author's certificate of the USSR №. 2505О2, class a 01 K 7/38, 1967. 2. USSR author's certificate No. 487316, class, Q 01 K 7/38, 1973 (prototype),