Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session J03: Diagnostic Development II
11:00 AM–12:30 PM,
Tuesday, July 12, 2022
Anaheim Marriott
Room: Platinum 1
Chair: Erin Nissen, Sandia National Laboratories
Abstract: J03.00005 : Chirped Fibre Bragg Grating Cutback Tests
12:00 PM–12:15 PM
Presenter:
Callum Pryer
(Atomic Weapons Establishment)
Author:
Callum Pryer
(Atomic Weapons Establishment)
Chirped Fibre Bragg Grating (CFBG) sensors can be applied to experiments to diagnose the velocities of propagating shock and detonation waves in explosively driven experiments by monitoring the rate of destruction of the CFBG. This paper describes a series of quasi-static laboratory tests designed to determine the response of the sensor as it is being consumed. A series of tests were performed, cutting approximately 0.5 mm from the end of the CFBG mm each time. Several pieces of diagnostic equipment were used to make measurements which are not possible to perform during dynamic experiments. An Optical Backscatter Reflectometer (OBR) was used to determine accurately the length of remaining CFBG after every cut and the frequency response of the CBFG calculated from this data. An Optical Spectrum Analyser was used to record the output spectrum of the CFBG after illumination from two different sources, with the setup similar to the instrument used to record the destruction in a dynamic experiment. The sources were an Amplified Spontaneous Emission (ASE) source and a superluminescent diode (SLED), both commonly used in the spectrally integrated approach to deploying CFBGs on experiments. Finally, a photodetector was also used to allow comparison of the recorded data to that obtained through dynamic experiments. The data gathered from these tests confirmed the understanding of the data from a spectrally integrated approach to using CFBGs and allowed for a comparison to be made to the spectrally resolved approach. Assessments were also made on how analysis of a CFBG with a bandwidth greater than the OBR can be achieved and comments on the illumination of the CFBG.
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