A new method for simultaneous measurement of phase retardation and optical axis of a compensation film

2006 ◽  
Author(s):  
Yung-Hsun Wu ◽  
Ju-Hyun Lee ◽  
Yi-Hsin Lin ◽  
Hongwen Ren ◽  
Shin-Tson Wu
Keyword(s):  
Simultaneous Measurement ◽  
Optical Axis ◽  
New Method ◽  
Phase Retardation

A new method for simultaneous measurement of Seebeck coefficient and resistivity

2016 ◽  
Vol 87 (12) ◽  
pp. 124901 ◽  
Author(s):  
Xu He ◽  
Junyou Yang ◽  
Qinghui Jiang ◽  
Yubo Luo ◽  
Dan Zhang ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Simultaneous Measurement ◽  
New Method

A New Method for Detecting the Diameter and Spatial Location of Tiny Through-Hole

2011 ◽  
Vol 189-193 ◽  
pp. 4186-4190 ◽  
Author(s):  
Zhi Gen Fei ◽  
Jun Jie Guo ◽  
Chang Shi Li
Keyword(s):  
Image Processing ◽  
Function Method ◽  
Optical Axis ◽  
Spatial Location ◽  
Processing Technique ◽  
New Method ◽  
Image Processing Technique ◽  
Experimental Platform ◽  
Digital Image Processing Technique ◽  
Through Hole

Aiming at the problem that the traditional plunged-bar method is difficult to meet the measurement requirement of spatial location of thin and small through-hole, in this paper, the digital image processing technique combined with sub-pixel detection technique is employed, and a new method is proposed to detect the tiny through-holes. The evaluating function method based on the “roundness” of the image of hole is presented to find out the posture parameters of CCD where the optical axis of CCD is parallel to the centerline of hole. Therefore, the spatial location of hole can be easily obtained by these posture parameters. Meanwhile, the diameter of hole can be achieved by means of image measuring technology at calculated posture of CCD. Owing to the non-contact measurement, this method is particularly suitable for those small through-holes drilled on the soft and easy-deformed object. The experiment results on the experimental platform illustrate the feasibility and validity of this method.

Research on Screw Thread Form Based on Non-Contact Measurement

2011 ◽  
Vol 101-102 ◽  
pp. 593-596
Author(s):  
Shao Feng Shen ◽  
Xian Cheng Wang ◽  
Jun Hua Chen
Keyword(s):  
Measurement Accuracy ◽  
Optical Axis ◽  
Optical Field ◽  
New Method ◽  
Detection Accuracy ◽  
Screw Thread ◽  
Characteristic Parameters ◽  
The Real ◽  
Contact Measurement ◽  
High Skill

There is a problem with non-contact measurement and detection, which reduces its measurement accuracy. Methods developed for measuring and inspecting screw thread characteristic parameters usually using a camera, which is controlled to scan the projection of thread in the parallel optical field to obtain thread images. However, with the block of screw line on the projection of the real thread form, it is impossible to acquire the real thread form from images. The traditional way is adjusting the optical axis to a suitable angle with the thread axis to acquire the real thread form projection, which has some problems, such as time consuming, high skill of operator, high-precision equipment for adjustment, inaccuracy, and so on. Hence, a new method through digital image calibration is presented. The results of relevant simulation indicated the feasibility of this new method, which improves thread measurement and detection accuracy.

scholarly journals A New Method of Simultaneous Measurement of Thermal Properties by Iterative Calculations

1976 ◽  
Vol 19 (137) ◽  
pp. 1326-1335 ◽  
Author(s):  
Masashi OKADA ◽  
Kozo KATAYAMA ◽  
Hiroshi HORIGUCHI
Keyword(s):  
Thermal Properties ◽  
Simultaneous Measurement ◽  
New Method
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