nA级离子泵电流测量系统的设计  

Design of a nA-Class Current Measurement System for Ion-Pumps

作　　者：张彦[1] 孙前刚 ZHANG Yan;SUN Qian-gang(The 723 Institute of CSIC,Yangzhou 225001,China)

机构地区：[1]中国船舶重工集团公司第723所,江苏扬州225001

出　　处：《真空电子技术》2018年第4期54-57,共4页Vacuum Electronics

摘　　要：静电陀螺仪正常工作时,高真空度的维持是其重要的静态条件。本文从热阴极离子泵的工作原理出发,通过测量离子流的大小,来监测静电陀螺仪内部的真空度;提出了一种基于STM32的测量系统,包括两级放大调理电路、高精度ADC和STM32单片机,并就其nA级电流测量的软硬件电路设计作出了详细说明。High vacuum maintenance is an important static condition for normal operation of electrically suspended gyro（ESG）.Based on the working principle of hot cathode ion-pumps,the vacuum degree of ESG is monitored by measuring the ion current.A measurement system based on STM32 is proposed,it includes two-stage amplification circuit,high precision ADC and STM32 microcontroller.Software and hardware circuit designed for nA-class current measuring is described in detail.

关 键 词：静电陀螺仪 离子泵 STM32 nA级电流 

分 类 号：TN107[电子电信—物理电子学]