SU1300310A2 - Device for measuring melt temperature,particularly,in crucible - Google Patents

Abstract

The invention relates to thermometry and allows for enhanced functionality and increased control efficiency. When melt 1 appears, a sensitive element is formed consisting of stationary 1, moving 5 electrodes (PE) and crucible 3. EMF of sensitive element 1 is proportional to the temperature of the melt at the point corresponding to PE 5. When measuring the temperature gradient, the reciprocating movement mechanism 7 produces movement of PE 5. Computing unit 12 (VB) produces a signal corresponding to the speed of movement of PE 5 relative to crucible 3. A signal proportional to temperature in VB 12 is differentiated, resulting in a field The signal is taken into account according to the rate of change of temperature. WB 12 then calculates the temperature gradient in the crystallization zone and outputs the corresponding signal to the device 15. Due to the reciprocating mechanism 7, the PC 5 can be stopped to measure the temperature at various points of the molten zone 1. The invention is additional to the basic author. St. No. 932284. 1 Il. with S WITH co about a 00 1H

Description

The invention relates to thermometry, can be used in devices for measuring the temperature of a melt, preferably in a crucible, for example, in installations for growing single crystals, and is an improvement of the invention according to auth. No. 932284,

The aim of the invention is to enhance the functionality and increase the efficiency of monitoring.

The drawing shows a diagram of the device.

The device contains an electrode, which serves as a melt 1, a single crystal 2, a crucible 3, a ligature 4, a second electrode 5, made in the form of a movable contact mounted on a holder 6 connected to a reciprocating movement of the mechanism 7, equipped with a sensor 8 for moving speed contact, an inductor 9 mounted on a movable platform 10, an inductor movement mechanism 11, a computing unit 12, to the input of which a ligature 4 is connected, a moving contact 5, an inductor moving speed sensor 13, and the output islitelnogo unit is connected to secondary devices 14 and 15, the temperature and temperature gradient at the metal

The device works as follows.

At the beginning of melting, inductor 9 and inductor movement mechanism 11 are turned on. The ligature 4 melts in the inductor zone and a liquid melt 1 is formed. At the lower boundary of the molten zone 1 due to the heat sink to the refrigerator (not shown) ras, the single crystal 2.

When melt 1 appears, a sensing element is formed consisting of two electrodes (fixed 1 and rolling 5) and crucible 3. Since the chemical composition of the ligature, and consequently, the melt, the melting point of the atmosphere around the crucible varies (since melting is carried out in an atmosphere of neutral gas), the EMF of the sensitive element is proportional to the temperature of the melt at the point corresponding to the position of the moving electrode 5. The readings of the sensitive element are recorded by the secondary device 14, scales and which is calibrated in C, within the limits corresponding to the temperature of the melt. As the inductor 9 moves relative to the crucible 3, the moving electrode 5 also moves, all the time remaining in the zone of the melt 1, which provides continuous temperature control during the melting.

When measuring the temperature gradient, the mechanism 7 for the reciprocating movement of the movable contact moves the movable electrode 5. The speed of the reciprocating movement of the movable electrode

the contact is chosen in advance greater than the speed of movement of the inductor. In one half motion of a moving contact, an instantaneous curve of temperature distribution is measured.

along the forming crucible. The computing unit 12 receives the signals of the moving speed V (i) of the reciprocating-Gel movement of the movable contact from the sensor 8 and the moving speed V (T) of the inductor from the sensor 13. The signal corresponding to the moving speed of the moving electrode is extracted in the computing unit 12 5 relative to crucible 3.

The signal proportional to the temperature in the computing unit 12 is differentiated, resulting in a signal corresponding to

Jrp

rate of change of temperature.

dt

Then the computing unit 12 calculates the temperature gradient in the crystallization zone and transfers the corresponding signal to the secondary

The device 15 temperature gradient in the metal, the scale of which is calibrated in s / mm.

45

50

After measuring the temperature gradient in the metal (for measuring reliability, several measurement cycles are performed), the mechanism 7 of the reciprocating motion is turned off until the next measurements.

With the mechanism of reciprocating motion 7, the moving electrode 5 can be stopped 55 to measure the temperature at various points of the molten zone 1, which also expands the functionality of the device.

3 13003104

Claims (1)

Claims of the sensor of the speed of movement of a slide Device for measuring the temperature contact, computing unit melt tours mainly in tig and secondary gauge le on auth. St. 932284, about tl and temperature gradient, and on Not only that, with the purpose5 of the input of the computational unit for connecting the expansion of functional grounding electrodes, the loop speed sensor and increasing the effectiveness of the inductor pinch and the speed sensor, it introduced a speed sensor for moving the movable contact, The inductor displacement, connected by the computational unit output by the inductor displacement mechanism, is connected with the secondary measuring impurities of the reciprocating temperature and temperature gradient gradients of the moving contact, temperature.