Measurement System of Optical Homogeneity of Large-Size Optical Material Based on Subaperture Stitching Technique

2012 ◽  
Vol 32 (4) ◽  
pp. 0412002
Author(s):  
徐新华 Xu Xinhua ◽  
王青 Wang Qing ◽  
宋波 Song Bo ◽  
傅英 Fu Ying
Keyword(s):  
Measurement System ◽  
Optical Material ◽  
Optical Homogeneity ◽  
Large Size ◽  
Subaperture Stitching

scholarly journals Absolute distance interferometry for subaperture stitching of large freeform optics

2020 ◽  
Vol 238 ◽  
pp. 06011
Author(s):  
Jan Spichtinger ◽  
Michael Schulz ◽  
Gerd Ehret
Keyword(s):  
Measurement System ◽  
Optical Axis ◽  
Distance Measurement ◽  
Fizeau Interferometer ◽  
Absolute Distance ◽  
Local Surface ◽  
Surface Gradient ◽  
Freeform Optics ◽  
The Absolute ◽  
Subaperture Stitching

We are developing a form measurement system for the surfaces of freeform optics and large conventional optics. The specifications of the optics are diameters up to 1.5 m and radii of curvature down to 10 m. This includes optics like telescope mirror segments and synchrotron optics. Using a Fizeau interferometer, we propose a subaperture stitching method that involves vertically aligning the interferometer’s optical axis to the local surface gradient and measuring the absolute distance from the interferometer’s reference flat to the specimen. Experimental results for the absolute distance measurement are shown.

Design of large-size aspheric measurement system and motion accuracy analysis

2010 ◽  
Author(s):  
Yonglu Zhu ◽  
Yinbiao Guo ◽  
Wei Luo ◽  
Lushuang Chen
Keyword(s):  
Measurement System ◽  
Accuracy Analysis ◽  
Large Size

Device and Method for Large Size Aspheric Measurement

2010 ◽  
Vol 97-101 ◽  
pp. 4324-4327
Author(s):  
Yong Lu Zhu ◽  
Yin Biao Guo ◽  
Xiao Long Ke ◽  
Lu Shuang Chen
Keyword(s):  
Control System ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Detection System ◽  
Experimental Results ◽  
Aspheric Surface ◽  
Large Size ◽  
And Control

In this paper, the necessary instrument and control system called the “Large Size Four-axis Measurement System” which used for measuring large size aspheric surface have been designed and established. Then the development of semi-meridian measurement method on basis of large size four-axis detection system has been reported. The measurement paths were planed and the measurement program was performed on the IPC. The method can significantly reduced the align error caused by the aspheric center which is not coincidence with the rotation platform center. With the measurement system, an aspheric surface was successfully measured; whose radius of semi-meridian was 55 mm. The experimental results show that the developed methods are simple and rapid. The measurement accuracy can satisfy requirement of aspheric surface.

Two-Step Wavelength Tuning Absolute Testing Method of the Optical Homogeneity of Optical Material

2012 ◽  
Vol 32 (11) ◽  
pp. 1112007
Author(s):  
李建欣 Li Jianxin ◽  
郭仁慧 Guo Renhui ◽  
朱日宏 Zhu Rihong ◽  
陈磊 Chen Lei ◽  
何勇 He Yong
Keyword(s):  
Wavelength Tuning ◽  
Optical Material ◽  
Optical Homogeneity ◽  
Testing Method

Desing of Real-Time Temperature Measurement System Based on Semiconductor Laser Diode

2014 ◽  
Vol 687-691 ◽  
pp. 886-889
Author(s):  
Zhong Shu Yang
Keyword(s):  
Temperature Measurement ◽  
Real Time ◽  
Laser Diode ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Semiconductor Laser Diode ◽  
Large Size ◽  
Controlling System ◽  
Airplane Engine ◽  
Temperature Measurement System

Thermoelectric couple was employed in traditional airplane engine temperature measurement system with the disadvantages of large size,heavy weight,big error and slow response.This paper presents a new kind of real—time temperature measurement system using laser diode InGaAs/I as light source,and using pyroelectric detector LiTa03 as optical receiving unit and using a microprocessor as signal processing center.This instrument consists of three parts:optical emitting and receiving system,signal amplifying and controlling system,and display system。The principle and structure of the system are introduced.Experimental results of airplane engine real—time temperature measurement show that temperature measurement accuracy and response time conform to our requirement in the range of 300°C一800°Cand agree with prediction of theory.All these prove that the design is correct.

A new form measurement system based on subaperture stitching with a line-scanning interferometer

2016 ◽  
Vol 5 (5-6) ◽  
Author(s):  
Sören Laubach ◽  
Gerd Ehret ◽  
Jörg Riebeling ◽  
Peter Lehmann
Keyword(s):  
Measurement System ◽  
Path Length ◽  
Optoelectronic Devices ◽  
Scanning Interferometer ◽  
Movement System ◽  
Line Scanning ◽  
New Form ◽  
Subaperture Stitching ◽  
Set Up ◽  
The Individual

AbstractA new optical form measurement system for almost rotational symmetric surfaces has been set up. It is based on an interferometric line sensor applying sinusoidal path length modulation in combination with a movement system. With this system, ring-shaped subapertures of the specimens are measured. The system is especially suitable for measuring spheres and aspheres with a broad range of radii (r>50 mm). The individual subapertures are stitched together to yield the full 3D topography. Because the rotation of the specimen by more than 360° has to yield the same results, inherent consistency tests are possible. Example measurements of a sphere are shown and discussed. Reproducibility measurements for one ring scan performed with the system show a standard deviation of 14 nm. The system can be set up at a moderate price as off-the-shelf mechanical and optoelectronic devices can be used. Future improvements of the system are discussed.

scholarly journals A Combined Measurement Method for Large-Size Aerospace Components

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4843
Author(s):  
Zhilong Zhou ◽  
Wei Liu ◽  
Qiong Wu ◽  
Yuxin Wang ◽  
Binchao Yu ◽  
...  
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Optimization Method ◽  
High Accuracy ◽  
Control Points ◽  
3D Scanner ◽  
Global Control ◽  
Accuracy Measurement ◽  
Large Size

Automated and high-accuracy three-dimensional (3D) shape measurement is required in quality control of large-size components for the aerospace industry. To eliminate the contradiction between global measurement and local precision measurement control in 3D digitalization for the key local features of the large-size components, a combined measurement method is proposed, including a 3D scanner, a laser tracker, and an industrial robot used as an orienting device, to achieve high-accuracy measurement. As for improving the overall measurement accuracy, an accurate calibration method based on coordinate optimization of common points (COCP) and coordinate optimization of global control points (COGP) is proposed to determine the coordinate systems. Firstly, a coordinate optimization method of common points (COCP) is recommended. Then, a coordinate optimization method of global control points (COGP) based on the angular constraint is proposed for minimizing the measurement errors and improving the measurement accuracy of the position and orientation of the 3D scanner. Finally, a combined measurement system is established, and validation experiments are carried out in laboratory within a distance of 4 m. The calibration experiment results demonstrate that the max and mean errors of the coordinate transformation have been reduced from 0.037 and 0.022 mm to 0.021 and 0.0122 mm. Additionally, the measurement experiment results also show that the combined measurement system features high accuracy.

New Large-Size Three-Dimensional Optical Measuring System Investigation

2013 ◽  
Vol 552 ◽  
pp. 271-275
Author(s):  
Jin Song Wang ◽  
Jian Liu ◽  
Li Juan Li ◽  
Shan Liu ◽  
Zhi Yong An
Keyword(s):  
Measurement System ◽  
Frequency Modulation ◽  
High Frequency ◽  
Optical Measurement ◽  
Three Dimensional ◽  
Automatic Measurement ◽  
High Accuracy ◽  
Measuring System ◽  
Laser Radar ◽  
Large Size

In this paper a new three-dimensional large-size optical measurement system by laser radar has been proposed in combination of double-optic circuit measuring technology, ultra-high frequency modulation technology and laser intellectual tracing and location technology. The system can measure 3d shape unconnectedly for lager-size object, which has the advantages of high accuracy, automatic measurement and freedom from being influenced by material and light ray.

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