Measurement of Radius of Curvature by Coordinate Measurement Machine

Chang, Shenq-Tsong; Lin, Wei; Huang, Ting; Hsu, M. Y.; Huang, Po Hsuan

doi:10.4028/www.scientific.net/amm.284-287.488

Cited by 3 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Inspection of the components is currently being performed. Such inspection consists of measuring dimensional and shape accuracy, mostly by means of conventional measurement methods -for example by contact method using coordinate-measuring machine [1]. Although such measurement is very accurate, it offers only constrained amount of discrete information, usually limited to measurement and comparison of prescribed dimensions and tolerances of shape and position according to the drawing.…”

Section: Introductionmentioning

confidence: 99%

Using Contactless Scanners for Quality Inspection

Mendřický

2016

MATEC Web Conf.

View full text Add to dashboard Cite

The article presents the research of use of modern 3D measurement contactless methods for quality inspection in automotive industry production. The experience with measuring functional assemblies and parts of complex shapes as well as advantages of optical measurement methods are shown on practical research example, whose aim was to find effective procedures and methods of obtaining 3-dimensional high-definition models of measured components. The obtained models were then subjected to inspection of their dimensional and shape accuracy, which was performed by means of comparison with the nominal CAD model, as well as to analyses of the assembly functionality by searching or collision situations of the movable parts of this mechanism.

show abstract

Section: Introductionmentioning

confidence: 99%

Using Contactless Scanners for Quality Inspection

Mendřický

2016

MATEC Web Conf.

View full text Add to dashboard Cite

show abstract

“…Thus, decenter and tilt relative to the main plate were also analyzed using the macro developed by the optical design software. 12 The M1 alignment procedure is shown in Fig. 5.…”

Section: Procedures For Aligning the Primary Mirror And Bipod Flexure mentioning

confidence: 99%

“…This method adopts the frequency of peaks and valleys of each fringe Zernike coefficient grabbed by the measurement with various orientations in a horizontal optical-axis configuration to separate the nonrotationally symmetric aberration of the mirror. 12 Based on the characteristics of each fringe Zernike term, the aberration from the residual form error after manufacturing was obtained before the bipod flexure bonding process. During the bench test, after the bipod flexure was bonded to the primary mirror, only form errors caused by manufacturing with mounting effects rotated as the mirror rotated, but the gravity effect and intrinsic systematic error did not.…”

Section: Optical Test With Wavefront Sensormentioning

confidence: 99%

Alignment and assembly process for primary mirror subsystem of a spaceborne telescope

Lin

Chang

et al. 2015

Opt. Eng

View full text Add to dashboard Cite

Abstract. In this study, a multispectral spaceborne Cassegrain telescope was developed. The telescope was equipped with a primary mirror with a 450-mm clear aperture composed of Zerodur and lightweighted at a ratio of approximately 50% to meet both thermal and mass requirements. Reducing the astigmatism was critical for this mirror. The astigmatism is caused by gravity effects, the bonding process, and deformation from mounting the main structure of the telescope (main plate). This article presents the primary mirror alignment, mechanical ground-supported equipment (MGSE), assembly process, and optical performance test used to assemble the primary mirror. A mechanical compensated shim is used as the interface between the bipod flexure and main plate. The shim was used to compensate for manufacturer errors found in components and differences between local coplanarity errors to prevent stress while the bipod flexure was screwed to the main plate. After primary mirror assembly, an optical performance test method called a bench test with an algorithm was used to analyze the astigmatism caused by the gravity effect and deformation from the mounting or supporter. The tolerance conditions for the primary mirror assembly require the astigmatism caused by gravity and mounting force deformation to be less than P − V 0.02 λ at 632.8 nm. The results demonstrated that the designed MGSE used in the alignment and assembly processes met the critical requirements for the primary mirror assembly of the telescope. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract