Content area
Vibration measurement is crucial in fields like aviation, aerospace, and automotive engineering, which are trending towards larger, lighter, and more complex structures with increasingly complicated dynamics. Consequently, measuring a structure’s dynamic characteristics has gained heightened importance. Among non-contact approaches, those based on high-speed cameras combined with laser interferometry or computational imaging have gained widespread attention. These techniques yield sequences of images that form a three-dimensional space-time data set. Effectively processing these data is a prerequisite for accurately extracting dynamic deformation information. This paper presents two examples to illustrate the significant advantages of signal processing along the time axis in dynamic interferometric and digital speckle-image-based dynamic measurements. The results show that the temporal process effectively minimizes speckle and electronic noise in the spatial domain and dramatically increases measurement resolutions.
Details
Digital imaging;
Laser interferometry;
Digital cameras;
Wavelet transforms;
High speed cameras;
Fourier transforms;
Vibration measurement;
Lasers;
Automotive engineering;
Interferometry;
Aerospace engineering;
Measurement techniques;
Digitization;
Information processing;
Algorithms;
Dynamic characteristics;
Deformation;
Speckle interferometry;
Vibration;
Cameras
1 Guangdong Zhuhai Supervision Testing Institute of Quality and Metrology, Zhuhai 519000, China;
2 College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;