The Repository @ St. Cloud State

Open Access Knowledge and Scholarship


Publication Title

Physics Letters A

Document Type


Publication Date



A fiber optic conveyor has been developed for investigating the travel-time difference between two counter-propagating light beams in uniformly moving fiber. Our finding is that there is a travel-time difference Δt = 2vΔl/c2 in a fiber segment of length Δl moving with the source and detector at a speed v, whether the segment is moving uniformly or circularly.


NOTICE: This is the publisher's PDF of a work that was accepted for publication in Physics Letters A. The definitive version was published as:

Wang, Ruyong, Yi Zheng, Aiping Yao, and Dean Langley (2003) "Modified Sagnac experiment for measuring travel-time difference between counter-propagating light beams in a uniformly moving fiber." Physics Letters A, Vol. 312, Iss. 1-2, pp. 7-10. DOI: 10.1016/S0375-9601(03)00575-9

The article is also available the arXiv.

Included in

Biomedical Commons



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.