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作 者:昝鹏[1] 颜国正[1] 何文辉[1] 郭旭东[1]
机构地区:[1]上海交通大学电信学院820研究所,上海200240
出 处:《测控技术》2006年第9期58-60,共3页Measurement & Control Technology
基 金:国家自然科学基金资助项目(30270382);国家863计划资助项目(2004AA404013)
摘 要:利用永久磁体和磁阻传感器对人体消化道无创诊查胶囊的定位是一个切实可行的方法之一,为此开发出了专用的定位实验电路。该电路由PIC单片机控制,采用仪用放大器对传感信号进行前置放大,并用可编程放大器(PGA)对不同传感电压信号进行有选择的放大,利用采样保持电路对9个传感通道同时采样,实现了对永久磁体空间任意一点的磁场强度和方向的检测。电路中还设计了与PC机通信的串口电路,可以对传感信号实时采样,以增加实验的灵活性。Using permanent-magnet and magnetic resistance is one of the feasible methods of positioning the non-invasive examination capsule in person' s alimentary canal, a special positioning experiment circuit is developed. The circuit is controlled by PIC microcontroller, the signal of the sensors is magnified by instrument amplifier and programmable amplifier is also used to magnify the signal from the sensors selectively, so the magnetic density and direction of any point in the permanent-magnet space can be measured by sampling the nine sensor-channels with sample hold circuit. The serial port circuit between the PC and the system is also designed to sample the signal of the sensors in real time for increasing the flexibility of the experiment.
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