Interferometric Measurement Of Truss Joint Design Strengths

Rufus E. Bruce Jr.; David B. Rozendal; Kenneth S. Edwards Jr.

doi:10.1117/12.957862

25 December 1979 Interferometric Measurement Of Truss Joint Design Strengths

Rufus E. Bruce Jr., David B. Rozendal, Kenneth S. Edwards Jr.

Proceedings Volume 0192, Interferometry; (1979) https://doi.org/10.1117/12.957862
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

Abstract

The difficulty in the measurement of the strain at the joints of members of wooden trusses has made the evaluation of theoretical strengths uncertain. This is particularly important if one desires to economically assure adequate roof strength for installation of solar collectors and other similar roof loading. This measurement problem has been solved by using interferometric techniques to determine small strains at truss joints. A modified Michelson interferometer has been adapted for this purpose. The interferometer, including He-Ne laser source and related optics, has been fabricated into two parts: One of the interferometer mirrors is floated independently on one truss member (two-point bearing), and the remainder (including source) in one piece on a two-point bearing on the other joint member. Using photographic techniques, both angular and lateral relative displacements of the two members have been measured. Design and details of the interferometer use are outlined.

Citation Download Citation

Rufus E. Bruce Jr., David B. Rozendal, and Kenneth S. Edwards Jr. "Interferometric Measurement Of Truss Joint Design Strengths", Proc. SPIE 0192, Interferometry, (25 December 1979); https://doi.org/10.1117/12.957862

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KEYWORDS

Interferometers

Mirrors

Interferometry

Photography

Fringe analysis

Beam splitters

Michelson interferometers

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