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19 October 2016 Vibration measurement based on the optical cross-correlation technique with femtosecond pulsed laser
Jibo Han, Tengfei Wu, Chunbo Zhao, Shuyi Li
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Proceedings Volume 10155, Optical Measurement Technology and Instrumentation; 101551H (2016) https://doi.org/10.1117/12.2246553
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
Two vibration measurement methods with femtosecond pulsed laser based on the optical cross-correlation technique are presented independently in this paper. The balanced optical cross-correlation technique can reflect the time jitter between the reference pluses and measurement pluses by detecting second harmonic signals using type II phase-matched nonlinear crystal and balanced amplified photo-detectors. In the first method, with the purpose of attaining the vibration displacement, the time difference of the reference pulses relative to the measurement pluses can be measured using single femtosecond pulsed laser. In the second method, there are a couple of femtosecond pulsed lasers with high pulse repetition frequency. Vibration displacement associated with cavity length can be calculated by means of precisely measuring the pulse repetition frequency. The results show that the range of measurement attains ±150μm for a 500fs pulse. These methods will be suited for vibration displacement measurement, including laboratory use, field testing and industrial application.
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Jibo Han, Tengfei Wu, Chunbo Zhao, and Shuyi Li "Vibration measurement based on the optical cross-correlation technique with femtosecond pulsed laser", Proc. SPIE 10155, Optical Measurement Technology and Instrumentation, 101551H (19 October 2016); https://doi.org/10.1117/12.2246553
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KEYWORDS
Femtosecond phenomena
Laser optics
Pulsed laser operation
Vibrometry
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