Dr. Carlos Gonzalez Profile

Dr. Carlos Gonzalez

Director at Abbott Point of Care Inc

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Proceedings Article | 24 September 2011 Paper

Vibration analysis using digital image processing for in vitro imaging systems

Zhonghua Wang, Shaohong Wang, Carlos Gonzalez

Proceedings Volume 8125, 81250D (2011) https://doi.org/10.1117/12.892430

KEYWORDS: Imaging systems, Statistical analysis, Biological research, Vibrometry, In vitro testing, Calibration, Digital image processing, Prototyping, Distortion, Error analysis

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A non-invasive self-measurement method for analyzing vibrations within a biological imaging system is presented. This method utilizes the system's imaging sensor, digital image processing and a custom dot matrix calibration target for in-situ vibration measurements. By taking a series of images of the target within a fixed field of view and time interval, averaging the dot profiles in each image, the in-plane coherent spacing of each dot can be identified in both the horizontal and vertical directions. The incoherent movement in the pattern spacing caused by vibration is then resolved from each image. Accounting for the CMOS imager rolling shutter, vibrations are then measured with different sampling times for intra-frame and inter-frame, the former provides the frame time and the later the image sampling time. The power spectrum density (PSD) analysis is then performed using both measurements to provide the incoherent system displacements and identify potential vibration sources. The PSD plots provide descriptive statistics of the displacement distribution due to random vibration contents. This approach has been successful in identifying vibration sources and measuring vibration geometric moments in imaging systems.

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