A HIGHLY ACCURATE ULTRASONIC MEASUREMENT SYSTEM FOR TREMOR USING BINARY AMPLITUDE-SHIFT-KEYING AND PHASE-SHIFT METHOD
A HIGHLY ACCURATE ULTRASONIC MEASUREMENT SYSTEM FOR TREMOR USING BINARY AMPLITUDE-SHIFT-KEYING AND PHASE-SHIFT METHOD
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DOI：
10.4015/s1016237203000109
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发表时间：
2003-04
期刊：
影响因子：
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通讯作者：
Meng-Hsiang Yang;K. Huang;C. F. Huang;S. S. Huang-S.;M. Young
中科院分区：
文献类型：
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作者：
Meng-Hsiang Yang;K. Huang;C. F. Huang;S. S. Huang-S.;M. Young
研制了一种用于等温空气的高精度二元移幅键控（BASK）超声震颤测量系统。本文提出了一种基于三种不同频率的超声波产生相移的简单而有效的算法。与相移法相比，该方法可以实现更大的测量范围，也可以获得比飞行时间法更高的精度。我们的微机系统包括两个重要部分。其中一种是BASK调制信号发生器。另一种是相位计，用于记录和计算三种不同频率的相移，然后将结果运动发送到LCD显示或PC进行校准。实验在实验室中进行，使用BASK调制频率为200hz和1khz，载波为40khz。本测量系统在实验中的测量精度在+/- 0.98 mm以内。该系统具有分辨率高、带宽要求窄、成本低、易于实现等优点。
A highly accurate Binary Amplitude-Shift-Keyed (BASK) ultrasonic tremor measurement system for use in isothermal air is developed. In this paper, we present a simple but efficient algorithm based upon phase shifts generated by three ultrasonic waves of different frequencies. By the proposed method, we can conduct larger range measurement than the phase-shift method and also get higher accuracy compared with the time-of-flight (TOF) method. Our microcomputer-based system includes two important parts. One of which is BASK modulation signal generator. The other is a phase meter designed to record and compute the phase shifts of the three different frequencies and the result motion is then sent to either an LCD for display or a PC for calibration. Experiments are done in the laboratory using BASK modulation for the frequencies of 200 Hz and 1 kHz with a 40 kHz carrier. The measurement accuracy of this measurement system in the reported experiments is within +/- 0.98 mm. The main advantages of this ultrasonic tremor measurement system are high resolution, narrow bandwidth requirement, low cost, and easy to be implemented.