Imaging photorefractive optical vibration measurement method and

Details Imaging photorefractive optical vibration measurement method and Imaging photorefractive optical vibration measurement method and

1998-02-25

2000-10-17

Kim, Robert H.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356349, 356358, G01B 902

Patent

active

061340065

ABSTRACT:
A method and apparatus are disclosed for characterizing a vibrating image of an object of interest. The method includes providing a sensing media having a detection resolution within a limited bandwidth and providing an object of interest having a vibrating medium. Two or more wavefronts are provided, with at least one of the wavefronts being modulated by interacting the one wavefront with the vibrating medium of the object of interest. The another wavefront is modulated such that the difference frequency between the one wavefront and the another wavefront is within a response range of the sensing media. The modulated one wavefront and another wavefront are combined in association with the sensing media to interfere and produce simultaneous vibration measurements that are distributed over the object so as to provide an image of the vibrating medium. The image has an output intensity that is substantially linear with small physical variations within the vibrating medium. Furthermore, the method includes detecting the image. In one implementation, the apparatus comprises a vibration spectrum analyzer having an emitter, a modulator, sensing media and a detector configured so as to realize such method. According to another implementation, the apparatus comprises a vibration imaging device.

REFERENCES:
patent: 4284324 (1981-08-01), Huignard et al.
patent: 4304458 (1981-12-01), Huignard et al.
patent: 4492468 (1985-01-01), Huignard et al.
patent: 5130849 (1992-07-01), Valley et al.
patent: 5131748 (1992-07-01), Monchalin et al.
patent: 5303031 (1994-04-01), Khoury et al.
patent: 5335062 (1994-08-01), Hofmeister et al.
patent: 5335548 (1994-08-01), Kalibjian
patent: 5841030 (1998-11-01), Honsberg et al.
Chatters, et al., "Optical Lock-In Vibration Detection Using Photorefractive Four-Wave Mixing," Review of Progress in Quantitative Nondestructive Evaluation, vol. 15B, pp. 2165-2171.
Hale, et al., "Optical lock-in vibration detection using photorefractive frequency domain processing," Applied Physics Letters, vol. 69, pp. 2632-2634, 1996.
Huignard, et al., "Two-wave mixing and energy transfer in Bi.sub.12 SiO.sub.20 crystals application to image amplification and vibration analysis," Optics Letters, vol. 6, No. 12, pp. 622-624, 1981.
Hofmeister, et al., "Vibration detection using dynamic photorefractive gratings in KTN/KLTN crystals," Applied Physics Letters, vol. 61, pp. 2395-2397, 1992.
Khoury, et al., "Photorefractive optical lock-in detector," Optics Letters, vol. 16, No. 18, pp. 1422-1444, 1991.
Rohleder, et al., "Quantitative measurement of the vibrational amplitude and phase photorefractive time-average interferometry: A comparison with electronic speckle pattern interferometry," Journal of Applied Physics, vol. 76, No. 1, pp. 81-84, 1994.
Hale, et al., "Vibration modal analysis using all-optical photorefractive processing," Proceedings of the International Society for Optical Engineering, vol. 2849, pp. 300-307, 1996.
Troth, et al., "Holographic interferometry using anisotropic self-diffraction in Bi.sub.12 SiO.sub.20," Optical Letters, vol. 16, pp. 53-55, 1991.
Yeh, "Wave Mixing in Photorefractive Media," Introduction to Photorefractive Nonlinear Optics, pp. 119-140, Wiley, NY 1993.
Wagner, "Optical Detection of Ultrasound," Physical Acoustics, vol. 19, Chapter 5, pp. 201-266, Academic Press, Inc., NY 1990.
Stepanov, "Adaptive Interferometry: A New Area of Applications of Photorefractive Crystals," International Trends in Optics, Chapter 9, pp. 125-140, Academic Press, Inc., NY 1991.

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