Nuclear magnetic resonance spectrometer gas circuit and temperature control system based on LAN (Local Area Network) and CAN (Controller Area Network) bus

Abstract

The invention relates to a nuclear magnetic resonance spectrometer gas circuit and temperature control system based on an LAN (Local Area Network) and a CAN (Controller Area Network) bus, belonging to a nuclear magnetic resonance spectrometer and providing a nuclear magnetic resonance spectrometer gas circuit and temperature control system based on the LAN and the CAN buses, with characteristics of strong independence and reliability, simpler structure, easy expansion, convenient maintenance, and the like. The nuclear magnetic resonance spectrometer gas circuit and temperature control system is provided with a central processing unit, a display unit, a CAN interface circuit, a rotating speed measuring circuit, a pneumatic valve drive circuit, a temperature measuring unit and a heating unit, wherein the central processing unit is connected with a computer; the central processing unit is connected with the display unit, the CAN interface circuit, the rotating speed measuring circuit, the pneumatic valve drive circuit, the temperature measuring unit and the heating circuit by adopting a standard CAN bus cable; the input end of the rotating speed measuring circuit is externally connected with a photoelectric rotating speed sensor, and the output end of the pneumatic valve drive circuit is externally connected with an electronic air valve; and the temperature measuring unit is externally connected with a thermoelectric couple, and the heating circuit is externally connected with a heating wire.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance spectrometer, in particular to a gas circuit and temperature control system of the nuclear magnetic resonance spectrometer based on LAN and CAN bus. Background technique [0002] The gas circuit and temperature control system are one of the important components of the nuclear magnetic resonance spectrometer. The main functions of the gas circuit and temperature control system are: ① Control the stability of the magnet legs to prevent vibration; ② Control the probe, gasket, and upper condenser tube; ③ Control And detect the gas flow in the variable temperature experiment ([1] Tang Funan. EM-360L nuclear magnetic resonance spectrometer variable temperature experimental technology [J] Analytical Instruments, 1988 (03): 30-33); ④ control the flow of liquid samples Lifting / lowering, lifting, rotating; ⑤ controlling the high-speed rotation of solid samples, etc. [0003] The NMR spectrometer is a high-en...

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Problems solved by technology

The transmission distance of multi-strand signal lines is limited, which determines that the distance between the gas circuit and the temperature control system and the hardware console cannot be too large ([3] Wu Zhenxiang, Zhang Guangming, Wei Xiaodong. Design of remote monitoring system for CNC machine tools based on CAN bus and research [J]. Machine Tools and Hydraulics, 2010 (06): 62-64), and increased the complexity and system cost of the system; and the multi-strand signal line itself has problems such as instability and failure ([4 ] Zheng Zhenyao, Li Jie, Tan Jun, etc. Room temperature shimming power supply for superconducting magnets: China, CN101673947[P].2010-03-17), once a fault occurs, the entire cable must be replaced, which is difficult to maintain, thus Directly reduces the reliability, scalability and maintainability of the gas path and temperature control system

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