摘要 |
A method and apparatus ( 10 ) is provided which employs phase or amplitude modulated electromagnetic probing waves ( 20 ) (in optical or microwave frequency ranges or both) emitted toward a vibrating object ( 8 ). The optical and/or microwave probing signals ( 20 ) remotely irradiate an object ( 8 ) of interest. The object ( 8 ) reflects and/or scatters the probing wave ( 20 ) toward a receiver ( 22 ). The reflected/scattered modulated signal ( 24 ) is received with a remote sensor (receiver) ( 22 ). Vibration causes additional phase modulation to the probing wave ( 20 ). At the receiving end, the signal is demodulated to extract and analyze the vibration waveform ( 26,28 ). The present invention can be utilized for nondestructive testing, monitoring of technological processes, structural integrity, noise and vibration control, mine detection, etc.
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