摘要
为实现光纤布拉格光栅(FBG)三维测头三路光纤信号的同步采集与快速处理,设计了一种基于数字信号处理器(DSP)的嵌入式信号采集与处理系统。系统采用的TMS320F2812处理器,其主频为150 MHz,结合AD7656模数转换器,可6通道同步采样,转换精度为16位,实现了三路光纤信号的同步采样和实时对三路信号做求和运算,当求和结果满足阈值条件,系统给外部设备发送触发脉冲信号,同时该系统还可通过串口与上位机进行通讯,以验证其采样精度并保存数据。试验结果表明,该系统同步性较好,响应速度快,采样精度小于3 mV,可用于光纤布拉格光栅测头的信号采集与处理。
In order to synchronously collect and fleetly process the three-channel fiber signal of fiber bragg grating（FBG） 3D probe,an embedded signal collection and processing system based on digital signal processor（DSP） was designed.The TMS320F2812 was used as a processor,which frequency was 150 MHz,and AD7656 as the A/D converter,which could synchronously sample the six-channel signal and had 16-bit DC accuracy.It was realized that this system could synchronously collect and real-time calculate the sum of the three-channel fiber signal.When the results satisfied the reference value,a trigger signal was sent to the external device by the system.Through using serial port to communicate with PC,the sampling-accuracy of the system was verified and the data was preserved.The test results show that the system has good synchronous-capability,high response-speed and sampling-accuracy less than 3 mV,so it can be used to collect and process the signal of FBG probe.
出处
《机电工程》
CAS
2011年第4期464-467,共4页
Journal of Mechanical & Electrical Engineering
