Investigation of Grating Collimation of Coherent Gradient Sensing Technique

  • Po-Yu Chen
  • Wei-Chung WangEmail author
Conference paper
Part of the Structural Integrity book series (STIN, volume 8)


In this paper, the grating collimation of coherent gradient sensing (CGS) technique was investigated. Due to the basic principle of the CGS technique, two gratings are used to obtain the interference fringe pattern, therefore, the accuracy of the CGS technique is directly influenced by the collimation of the two gratings. In order to investigate the grating collimation of the CGS technique, a standard specimen was implemented. The measurement results show that the error becomes larger when the rotational misalignment between the gratings was increased.


Collimation Grating Coherent gradient sensing technique Rotational misalignment 



This paper was supported in part by the Ministry of Science and Technology (Grant no. MOST 105-2221-E-007-047-MY3), Taiwan, Republic of China.


  1. 1.
    Tippur, H.V., Krishnaswamy, S., Rosakis, A.J.: A coherent gradient sensor for crack tip deformation measurements: analysis and experimental results. Int. J. Fract. 48, 193–204 (1991)CrossRefGoogle Scholar
  2. 2.
    Dhanotia, J., Prakash, S.: Collimation testing using coherent gradient sensing. Opt. Lasers Eng. 49, 1185–1189 (2011)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Power Mechanical EngineeringNational Tsing Hua UniversityHsinchuTaiwan, Republic of China

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