Fully-digital distributed scintillation crystal lifting furnace control system

Abstract

A fully-digital distributed scintillation crystal lifting furnace control system includes an upper computer, an intermediate-frequency heating module, a weighing module, and a crystal growth control module. A control module communicates with the weighing module to obtain a weighing signal, the control module communicates with the intermediate-frequency heating module to set a power value and read an intermediate-frequency parameter, the control module communicates with the upper computer to upload a monitoring signal and receive an operating command, and all the communication is digital and greatly improves the control accuracy of the system. The system provided by the invention is designed based on the ideal of a distributed control system. The control module and the upper computer are mutually independent in function, so that crystal growth control can get rid of software of the upper computer and normally proceed, and hidden danger brought by faults of the upper computer is prevented. Meanwhile, one upper computer can be connected with multiple lower computer control modules, so that crystal growth can be monitored in a more concentrated manner, and equipment and manpower costs are reduced greatly.

Description

technical field [0001] The invention relates to the field of scintillation crystal pulling furnaces, in particular to an all-digital collection and distribution scintillation crystal pulling furnace control system. Background technique [0002] The pulling method, also known as the Czochralski method, is a method invented by J. Czochralski in 1917 to grow high-quality single crystals from a melt. In order to achieve defined crystal growth, the diameter of the crystal must be controlled during the growth process. [0003] Inorganic scintillation crystals LYSO and YSO are widely used in radiation detection and large-scale nuclear medical imaging equipment. At present, domestic scintillation crystal pulling furnaces generally adopt a control system based on a host computer and a temperature control meter, and the crystal growth control must rely on the software of the host computer. Because the crystal growth cycle is very long, computer crashes and software crashes will caus...

AI Technical Summary

Problems solved by technology

Analog signals are susceptible to various interferences, especially in the scintillation crystal pulling furnace control system, due to the existence of intermediate frequency, the interference is relatively large

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