Upgraded fiber-optic sensor system for dynamic strain measurement in Spallation Neutron Source

Liu, Yun; Winder, Drew E.; Qi, Bing; Long, Cary; Lu, Wei

doi:10.1109/JSEN.2021.3120212

Upgraded fiber-optic sensor system for dynamic strain measurement in Spallation Neutron Source

Journal Article · Sun Oct 24 00:00:00 EDT 2021 · IEEE Sensors Journal

DOI:https://doi.org/10.1109/JSEN.2021.3120212· OSTI ID:1836445

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We describe an upgraded fiber-optic sensor system and its performance in measuring the dynamic strains in a mercury target of the Spallation Neutron Source (SNS). Strains result from dynamic pressure waves in the stainless-steel mercury target induced by short (~700 ns), intense (up to 23.3 kJ), high-energy (~1 GeV) proton pulses. In the upgraded sensor system, the output of each sensor head is interrogated with a compact, all-fiber based Faraday Michelson interferometer, which generates interference signals with a steady phase shift. Strain waveforms are recovered from the phase-shifted interference signals using a high-speed digital signal processing procedure developed in our previous work. We demonstrate successful measurements of dynamic strain pulses, e.g., 400με over 190μs , on a recently installed SNS target using the upgraded sensor system. The measured strain waveforms are analyzed for more than 20 sensor locations and/or orientations, and provide information regarding the temporal structure of strain profiles and dependence of the strain magnitude on the proton powers of 200 – 1400 kW. The new interrogator also measures the radiation-induced-attenuation (RIA) in the optical fiber, enabling experimental investigations of RIA profiles induced by a 700-ns radiation pulse. The radiation effects on the strain measurement performance are discussed over a radiation dose range of up to 4×10⁸ Gy and an RIA compensation method is proposed. The measurements allow insight into the response of this unique piece of equipment and can be used for validation of simulations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1836445

Journal Information:: IEEE Sensors Journal, Journal Name: IEEE Sensors Journal Journal Issue: 23 Vol. 21; ISSN 1530-437X

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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