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利用数字信号处理技术新开发出来的声波测径工具，同以往的工具相比，提高了测量精度和作业范围。介绍了声波测径仪的特点、工作原理及设计方法等。该工具单独下井运行，也能与其它ＭＷＤ传感器组合下井运行。
The use of digital signal processing technology newly developed sonic caliper tool, compared with the previous tools to improve the measurement accuracy and operating range. The characteristics, working principle and design method of sonic sizer are introduced. The tool goes down alone and can be run in combination with other MWD sensors.