New digital displacement measuring circuit for aperiodic vibration using self-mixing type LDV
New digital displacement measuring circuit for aperiodic vibration using self-mixing type LDV
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采用自混合型LDV的新型非周期振动数字位移测量电路
DOI：
10.1109/imtc.1994.352055
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Sumi
中科院分区：
文献类型：
--
作者：
M. Toyoshima;T. Ohashi;S. Shinohara;H. Yoshida;H. Ikeda;M. Sumi
实验结果表明，采用自混频半导体激光二极管的激光多普勒测速仪（LDV）可以方便地测量扬声器的振动位移。在多普勒拍信号中，从新的计数电路的输出向上或向下计数的波数被存储在计算机中。然后得到扬声器表面非周期振动的数字位移信息，作为实际的表面运动。在这种测量中，由音频信号驱动的扬声器振动也可以被测量。该方法简便，可用于各种振动测量
It has been confirmed by the novel method that the vibrational displacement of a loudspeaker can be measured easily by a laser Doppler velocimeter (LDV) using a self-mixing semiconductor laser diode. The number of waves in the Doppler beat signal which is counted up or down from the output of the new counter circuit is stored in a computer. Then the digital displacement information of the aperiodic vibration of the loudspeaker surface also is obtained as the actual surface motion. In this measurement the speaker vibration driven by an audio signal also can be measured. This method will be applied to various vibrational measurements for its simplicity.<<ETX>>