用于高速测量的CCD激光位移传感器的研究

介绍了一种用于高速测量的CCD激光位移传感器测量系统，可用于高速、实时地测量运动物体的位移或高速振动。传感器测量系统由光学系统、具有7500像元的高速线阵CCD、转换速率达40MHz的高速ADC、高速缓存FIFO、比较器筛选电路、CPLD时钟驱动电路、像元脉冲计数器和数字信号处理器DSP构成。在系统中采用自适应控制方法，通过调节激光的发射频率和输出电流强度来调节发射激光光强，从而适应各种被测对象和外界环境条件。采用特殊设计的比较器筛选电路来控制FIFO对高速AD采样数据的存储和DSP对高速FIFO中数据的读取，使 FIFO只存储CCD输出的有效像元信号，从而减轻了DSP数据处理的负担，实现对CCD传感器信号的采集与处理同时进行，以满足高速测量的需要。实验表明数据转换速率可达40M，最小采样间隔时间为0.1ms。

Development of CCD Laser Displacement Sensor for High-Speed Measurement

A new type of CCD laser displacement sensor for high-speed measurement is introduced, which can be used to measure the displacement of moving object or high-speed vibration by the mode of High-speed and real-time. The sensor system is composed of optical system, linear CCD with 7500 image elements, high-speed analog-to-digital converter (ADC) that converts at sampling rates up to 40 mega samples per second (MSPS), high-speed First-In,First-Out (FIFO) memories with clocked read and write controls, comparator selecting circuit and digital signal processor(DSP). Because the self-adapting control method is adopted, the light intensity of laser is modulated by setting external resistors to adjust separately the oscillation frequency and output current of laser, so that make suitable to various specific use or situation. Additionally, storage data from high-speed A/D converter and read data from high-speed FIFO can be controlled by the comparator selecting circuit that is specially designed, then only useful signal of image elements outputted by CCD is memorized by FIFO. Therefore, the burden of DSP is alleviated, and both data acquisition and process for CCD sensor signal can be carried out synchronously. This system can be used in the field of high-speed measurement of displacement. The results of experiment show that the velocity of data acquisition can reach to 40M and the minimum sampling interval is 0.1ms.