数字错位散斑术的自控音频激振加载研究

Auto-control Audio-frequency Driving Vibration Used in Shearography

对数字错位散斑干涉测量技术的音频扫描加载方式进行了研究,提出并实现了计算机控制的宽带音频扫描加载系统,该系统具有使用方便,音频信号可任意控制,既可以有稳定的单一信号输出,又可以连续输出线性关系的宽带扫频信号。研制开发的压控式音频波形发生器(Voltage-controlled Wave form Generator),在工程中具有广泛的应用价值。

It proposes a new technique that uses audio-frequency sweep loadings in digital speckle shearography.The voltgae-controlled waveform generator is made.The device is capable of producing high accuracy sine.The frequency can be selected externally from 10Hz to more than 10kHz,and frequency sweeping can be accomplished with a computer.