数字化超声探伤仪数据压缩器设计

Design of data-compaction instrument in digital ultrasonic flaw detection device

在数字化超声波探伤中,回波信号经高速A/D采样变换后,会得到大量的采集数据.但在探伤曲线的描绘中并不是用到所有数据,因此要对这些数据进行压缩处理,这就需要用到数据压缩器.论述了数据压缩器的原理,并设计了一种新型的专用ISP数据压缩器,该压缩器具有压缩点数可调,可自动提供1024个连续的外部数据存储单元的地址等特点.也给出了该专用ISP数据压缩器的VHDL编程实现.该仪器现只进行了初步设计,还有待继续完善.

In digital ultrasonic flaw detection, the radar echo sampled and transited by htghspeed A/D can get a great many of data. But during drawing a flaw detection curve, not all of the data need to be used. It is necessary to compress so many data, so datacompaction instrument must be designed and used. This paper disserts the principle of datacompaction instrument, and designs an exclusive instrument using TSP which may change compression point and automatically provide 1 024 consecutive addresses of outside data storage unit. This paper offers the program of datacompaction instrument came through VHDL. This instrument is only a primary design and needs inprovement.