Three-Dimensional Surface Shape Measurement of Big Objects by Image Splicing in Digital Holography

Zhongyao, 冯忠耀 Feng; Fang, 贾昉 Jia; Jinghui, 周景会 Zhou; Manli, 忽满利 Hu

doi:10.3788/cjl20083512.2017

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Holography can simultaneously record the amplitudes and phases of object waves, so this technique is widely used for three-dimensional (3D) display, [1,2] topography measurement, [3,4] information encryption, [5][6][7] and biological cell microscopy. [8][9][10] Initially, the original holography [11] proposed by Gabor has many inherent shortcomings, and the DC and conjugate terms seriously reduce the image quality due to the coaxial optical system.…”

Section: Introductionmentioning

confidence: 99%

Single-shot phase-shifting digital holography with a photon-sieve-filtering telescope*

Li¹,

Li²,

Zhang³

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

A method of single-shot phase-shifting digital holography with a photon-sieve-filtering telescope is proposed. Three copy images with different phases are first generated by use of a monofocal photon-sieve filter in Kepler telescope, and then interfere with the reference plane wave by a beam combiner. The hologram is captured by a charge-coupled device (CCD) in one single exposure. The complex-valued amplitude of the test object can be reconstructed by three-step phase-shifting interferometry through three frames of extracted sub-interferograms from the single-exposure hologram. The principle and simulation experiments are carried out and verified the validity of our proposed method. This method can be applied for snapshot imaging and three-dimensional object construction.

show abstract

Section: Introductionmentioning

confidence: 99%

Single-shot phase-shifting digital holography with a photon-sieve-filtering telescope*

Li¹,

Li²,

Zhang³

et al. 2019

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

Three-Dimensional Reconstruction of Mechanical Parts Based on Digital Holography

Dai

Zhu

et al. 2020

International Journal of Optics

View full text Add to dashboard Cite

In reconstruction of the off-axis digital hologram of diffuse reflection objects, the position of the positive first-order image cannot be accurately obtained because of the low quality of the reconstruction image. This paper focuses on the above problem and proposes a method for marking the first-order image of the 1-FFT surface based on the fast Fourier transform (1-FFT). The parameters of angle of illumination light were investigated, and the maximum relative measurement error is 5.6% by standard objects. The multiaperture stitching technique in cylindrical coordinates is applied to digital holography technology, and the particle swarm optimization algorithm is used to transform the nonlinear equations into optimization problems to solve the splicing parameters. Finally, the 3D display of a typical rotary three-dimensional mechanical part is successfully realized with holography stitching using the above method.

show abstract

Noncontact Defect Detection Method of Automobile Cylinder Block Based on SVM Algorithm

Yan

2022

Mobile Information Systems

View full text Add to dashboard Cite

Based on the problems encountered in the gateway system, this article developed the SVM algorithm support vector machine auxiliary system based on the function of the hybrid network gateway to help the gateway dynamically adjust its operating status to ensure the stability of the gateway system and the real-time internal data. This paper studies the noncontact defect detection system of automobile cylinder block on the basis of the SVM algorithm. There are many thin holes in the wall of automobile engine cylinder block, the structure is complex, and the processing is easy to deform. In order to solve the problem of deformation of the automobile engine cylinder block during the milling process, this paper uses a combination of simulation and experiment to analyze the clamping deformation and milling deformation during the machining of the top surface of the automobile cylinder block and proposes the control of the milling deformation profile error measure. Aiming at the problems of backward detection technology, low detection efficiency, and low detection accuracy for the detection of defects on the inner surface of the master cylinder of automobile brakes, this paper uses the machine vision technology to choose the noncontact method of measurement. The use of laser nonultrasonic contact systems is not limited to workpieces having regular shapes, such as planes and cylinders. It is limited to workpieces with regular shapes such as planes and cylinders. In the automotive and other industrial fields, for various curved parts with free-form surfaces, nondestructive testing techniques of laser nonultrasonic contact systems are generally required to find defects. In the research of the noncontact defect detection method of the automobile cylinder block based on the SVM algorithm, this paper hopes that the detection efficiency and detection accuracy of the inner surface of the brake cylinder can be improved, and the defect location can be accurately found.

show abstract

Three-Dimensional Surface Shape Measurement of Big Objects by Image Splicing in Digital Holography

Cited by 3 publications

References 0 publications

Single-shot phase-shifting digital holography with a photon-sieve-filtering telescope*

Single-shot phase-shifting digital holography with a photon-sieve-filtering telescope*

Three-Dimensional Reconstruction of Mechanical Parts Based on Digital Holography

Noncontact Defect Detection Method of Automobile Cylinder Block Based on SVM Algorithm

Contact Info

Product

Resources

About