Non-contact Full Field Vibration Measurement Based on Phase-Shifting
| Autor: | Yuji Kokumai, Hiroyuki Kayaba |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Computer science
business.industry Fast Fourier transform ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION 02 engineering and technology 021001 nanoscience & nanotechnology Frame rate Tracking (particle physics) 01 natural sciences law.invention 010309 optics Vibration Acceleration Projector law Feature (computer vision) 0103 physical sciences Vibration measurement Point (geometry) Computer vision Artificial intelligence 0210 nano-technology business ComputingMethodologies_COMPUTERGRAPHICS |
| Zdroj: | CVPR |
| Popis: | Vibration measurement systems are widely used in the industry. A variety of vibration measurement techniques are proposed, including methods using an acceleration sensor, a laser displacement meter, and tracking a marker using a camera. However, these methods have limitations that allow only one point to be measured and require markers. We present a novel, non-contact full field joint measurement technique both of vibrations and shape based on phase-shifting. Our key idea is to acquire the frequency of vibrating objects using FFT to analyze the phase-shift error of vibrating objects. Our proposed algorithm estimates the phase-shift error by iterating frame-to-frame optimization and pixel-to-pixel optimization. A feature of our approach is to measure the surface of vibrating at different frequencies without markers or texture in full fields. Our developed system is a low cost system, which is composed of a digital-light-processing (DLP) projector and camera (100 frames per second). The results of our experiments show that low frequency vibration of objects can be measured with high accuracy in non-contact. Also, reconstruction of the vibrating object surface can be performed with high accuracy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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