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Proceedings Paper

Strain/displacement of a carabiner via interferometry
Author(s): Michael A. Walk
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Paper Abstract

A double exposed reflection hologram and interferometry will be used to analyze the structural integrity of a carabiner. The first exposure will depict the carabiner unstressed, and the second will illustrate the carabiner under stress. After this, the carabiner will be broken and then compared with a developed hologram. The breaking strength will be determined using this method. A double exposed hologram of a control block - which moves approximately one micrometer - will be used to find a relationship between the amount of displacement and the weight applied to the carabiner. A hologram will then be made using the weight needed to move the carabiner one-micrometer to verify the relationship. Once the theory is validated, another carabiner, of the same model with little use, will be used as a test piece. Another double exposed hologram will then be taken of the new carabiner. Next the carabiner will be cycled approximately 500,000 times with a two Kilo-Newton load for duration of one week. Then one more double exposed hologram will be made after the cycles are completed. Once the holograms are developed, the two will be compared thus showing any changes in structural integrity if any are present. If changes in structural integrity are observed, a guide to determine if the carabiner being tested should be retired will be recommended.

Paper Details

Date Published: 7 March 2006
PDF: 9 pages
Proc. SPIE 4101, Laser Interferometry X: Techniques and Analysis, (7 March 2006); doi: 10.1117/12.498410
Show Author Affiliations
Michael A. Walk, Columbia Area Career Ctr. (United States)


Published in SPIE Proceedings Vol. 4101:
Laser Interferometry X: Techniques and Analysis
Gordon M. Brown; Werner P. O. Jueptner; Ryszard J. Pryputniewicz; Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)

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