Photorefractive optical lock-in vibration spectral measurement
- Idaho National Engineering and Environmental Laboratory, Lockheed Martin Idaho Technologies Company, Idaho Falls, Idaho 83415-2209 (United States)
An optical photorefractive frequency-domain method is described for measuring displacement amplitude and phase of vibrating surfaces. The method is applicable to diffusely scattering surfaces and usable in either a point-detection or imaging configuration. The method utilizes an optical lock-in approach to measure phase modulation of light scattered from continuously vibrating surfaces. Picometer displacement sensitivities have been demonstrated over a frequency range of 100 Hz to greater than 100 kHz. The response of the spectral method is independent of the vibration frequency above the photorefractive cutoff frequency. Two methods are described that produce a readout beam intensity that is a direct function of the vibration amplitude suitable for imaging. {copyright} 1997 Optical Society of America
- Research Organization:
- Idaho National Engineering Lab
- DOE Contract Number:
- AC07-94ID13223
- OSTI ID:
- 568294
- Journal Information:
- Applied Optics, Vol. 36, Issue 31; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Optical lock-in vibration detection using photorefractive frequency domain processing
Ultrasonic Imaging of Subsurface Objects Using Photorefractive Dynamic Holography