基于MODBUS协议的深海原位核探测谱仪读出方法

Readout method for deep-sea in-situ nuclear radiation detector based on MODBUS protocol

深海原位核辐射探测仪在经过母船配置后,可以自行在原位环境中运行。同时,仪器打捞回收后,母船需要完成与之对接和数据回收功能,探测仪和母船上位机之间的数据读出成为一个关键问题。针对目前谱仪读出设备中存在的兼容性和可扩展性问题,设计了深海原位核辐射探测仪的数据读出方法,硬件上采用RS485和LVDS物理层,保证谱仪数据的稳定可靠读出;应用层使用MODBUS协议,利用其开放性、易用性、可靠性等特点,提高了谱仪的兼容性和可扩展性。通过搭建实验室测试平台,对系统整体功能和物理层传输信号的误码率、眼图进行测试。结果表明,读出方法能够实现深海原位伽马探测仪数据的稳定可靠读出,在低速和高速模式下的读出数据率分别为115 200 bit/s和40 Mbit/s。

The deep-sea in-situ nuclear radiation detector can operate in the in-situ environment by itself after being configured by the mother ship. At the same time, after the instrument is salvaged and recovered, the mother ship needs to complete the docking and data recovery functions, and the data readout between the detector and the host computer on the mother ship becomes a key issue. Aiming at the compatibility and scalability problems existing in the current spectrometer readout equipment, this paper designs a data read-out method for the deep-sea in-situ nuclear radiation detector. The RS485 and LVDS physical layer are used in hardware to ensure the stable and reliable data readout spectrometer. The MODBUS protocol application layer is used to improve compatibility and scalability spectrometer. By building a laboratory test platform, the overall function of the system, and the bit error rate, eye diagram of the physical layer are tested. The results show that the method can realize the stable and reliable data readout of the deep-sea in-situ gamma detector. In the low-speed mode and high-speed mode, the reading data rate of the detection instrument system is 115 200 bit/s and 40 Mbit/s respectively.