For an a mode biometric probe, ultrasonic beam orientation, measuring position and speed setting ensured the precision of the measurement.
对于A型生物测量探头，通过在声束定向、测量位置和声速设置等方面的设计思想，有效提高测量精度。
The principle of ultrasonic measuring distance in the air was analyzed. A method of improving the measurement precision by correcting transmission speed with inspecting temperature was put forward.
分析了空气中超声波测距原理，提出了通过温度测量修正超声波传播速度，提高空气中测量精度的方法。
The repetition of the ultrasonic sound and the experiment of zero velocity in gas flowmeter are tested using this speed measurement system.
利用该测速系统，进行了超声波的重复性测试，以及在以空气为介质的零流实验。
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