22 January 1982 Preparation, Installation, And Calibration Of A 152 Fiber Imaging Experiment At The Nevada Test Site
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Fiber-optic transmission lines are being used with increasing frequency in the demanding environment of nuclear device diagnostic tests at the Nevada Test Site. Previous reports have described diagnostic experiments that utilize properties of fiber-optic cables to provide capabilities that are extremely difficult to obtain with coaxial cable systems.1 This paper describes an imaging experiment conducted during the last quarter of 1980 at the Nevada Test Site involving 152 -0.6-km long GI fibers in 18 cables. An imager cell sensitive to neutron and gamma radiation was located at -8 m from the source. Individual elements of the fluor were coupled by -10 m PCS fibers (for radiation damage resistance) to the GI fibers used for the uphole and surface lines to the detector station. Light from the imager cell in a 9-nm band, centered at 540 nm, was detected by photomultipliers and the electrical signals then recorded on oscilloscopes. Overall system bandwidth, including the fluor, was -80 MHz. Due to the complexity of the experiment and the conditions associated with field testing, the PCS and GI fibers were cut and terminated under laboratory shop conditions prior to installation at the field site. Procedures used for quality assurance of the fiber assemblies as well as procedures used in checking fiber throughput during installation are described. The application of a large star coupler (5 input x 200 output fibers) used for system time and amplitude calibration and an attempt to "shutter" fibers with neutrons for a multiplexing application are also discussed.
© (1982) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. R. Thayer, P. B. Lyons, L. D. Looney, J. P. Manning, R. M. Malone, "Preparation, Installation, And Calibration Of A 152 Fiber Imaging Experiment At The Nevada Test Site", Proc. SPIE 0296, Fiber Optics in Adverse Environments I, (22 January 1982); doi: 10.1117/12.932447; https://doi.org/10.1117/12.932447


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