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Title: Optimal use of dynamic range of a white light video measurement system
Authors: Quan, C. 
Tay, C.J. 
Wu, T.
Wang, S.H. 
Shang, H.M. 
Keywords: CCD sensor
Dynamic range of detector
Fringe projection
High-speed camera
In situ measurement
White light source
Issue Date: 15-Jul-2004
Citation: Quan, C., Tay, C.J., Wu, T., Wang, S.H., Shang, H.M. (2004-07-15). Optimal use of dynamic range of a white light video measurement system. Optics Communications 237 (4-6) : 243-250. ScholarBank@NUS Repository.
Abstract: This paper describes a method to make optimal use of the dynamic range of a white light video measurement system. Since the exposure period of a CCD camera is reduced with high frame rate, dynamic measurement with a short exposure is intrinsically light intensity starved. Thus insufficiency in light intensity may introduce underexposure problem and leads to poor image quality. To overcome this problem, we have developed a simple method which enhances the light intensity detected by a high-speed camera using a white light source (WLS). As an example, we have implemented the system for vibration measurement using a liquid crystal display (LCD) projector and a high-speed camera. By incorporating the WLS, the measurement speed of the camera is effectively increased by a factor of 6. Discrepancy in the measured vibration amplitude is less than 2%. This experimental study shows a clear demonstration of the limitations of the performance of a CCD camera and the importance of matching the intensity of the image to be analyzed to the characteristics of the detector. © 2004 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
DOI: 10.1016/j.optcom.2004.03.090
Appears in Collections:Staff Publications

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