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In this work, we have demonstrated the use of Fiber Bragg Grating (FBG) sensor for measuring dynamic strain in aerospace grade rubber sample impacted with blast wave inside a Vertical shock tube. FBG strain measurement assembly has been specially designed, that is mounted in the driven section of shock tube. The blast wave generated has decay time in order of milliseconds with flow Mach number of 1.9. Blast pressure profile is measured using PCB pressure transducer at an acquisition rate of 1 MHz. A high strain rate of 13 s−1 is induced in the rubber sample which is captured by the FBG sensor at a high acquisition rate of 1 MHz. FBG sensor shows a fast response time of 0.09 ms. The overall response of FBG strain sensor to incident and reflected blast waves is analyzed. FBG sensor due to its miniature size, flexibility and immunity to electromagnetic interference is an excellent choice for strain measurement in harsh environment of aerodynamic impulse facilities like shock tubes.

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Measurement of Blast Wave-Induced Strain Using Fiber Bragg Grating Sensor Inside Shock Tube

  • 会议论文

  • 发表日期：

    2025年

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  • Gautam Hegde,
  • Harshit Verma,
  • Gopalkrishna Hegde,
  • G. Jagadeesh,
  • S. Asokan

摘要

In this work, we have demonstrated the use of Fiber Bragg Grating (FBG) sensor for measuring dynamic strain in aerospace grade rubber sample impacted with blast wave inside a Vertical shock tube. FBG strain measurement assembly has been specially designed, that is mounted in the driven section of shock tube. The blast wave generated has decay time in order of milliseconds with flow Mach number of 1.9. Blast pressure profile is measured using PCB pressure transducer at an acquisition rate of 1 MHz. A high strain rate of 13 s−1 is induced in the rubber sample which is captured by the FBG sensor at a high acquisition rate of 1 MHz. FBG sensor shows a fast response time of 0.09 ms. The overall response of FBG strain sensor to incident and reflected blast waves is analyzed. FBG sensor due to its miniature size, flexibility and immunity to electromagnetic interference is an excellent choice for strain measurement in harsh environment of aerodynamic impulse facilities like shock tubes.