Wavelength-time mapping linear chirped fiber bragg grating sensor for measuring the wave-front position of detonation and shock wave

DENG Xiangyang; LUO Zhenxiong; LIU Shouxian; MENG Jianhua; TIAN Jianhua; HE Lihua

doi:10.11883/bzycj-2017-0416

Volume 39 Issue 3

Mar. 2019

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DENG Xiangyang, LUO Zhenxiong, LIU Shouxian, MENG Jianhua, TIAN Jianhua, HE Lihua. Wavelength-time mapping linear chirped fiber bragg grating sensor for measuring the wave-front position of detonation and shock wave[J]. Explosion And Shock Waves, 2019, 39(3): 034101. doi: 10.11883/bzycj-2017-0416

Citation:

DENG Xiangyang, LUO Zhenxiong, LIU Shouxian, MENG Jianhua, TIAN Jianhua, HE Lihua. Wavelength-time mapping linear chirped fiber bragg grating sensor for measuring the wave-front position of detonation and shock wave[J]. Explosion And Shock Waves, 2019, 39(3): 034101. doi: 10.11883/bzycj-2017-0416

Citation:

DENG Xiangyang, LUO Zhenxiong, LIU Shouxian, MENG Jianhua, TIAN Jianhua, HE Lihua. Wavelength-time mapping linear chirped fiber bragg grating sensor for measuring the wave-front position of detonation and shock wave[J]. Explosion And Shock Waves, 2019, 39(3): 034101. doi: 10.11883/bzycj-2017-0416

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Wavelength-time mapping linear chirped fiber bragg grating sensor for measuring the wave-front position of detonation and shock wave

doi: 10.11883/bzycj-2017-0416

1.
School of Physical Sciences, University of Science and Technology of China, Hefei 230022, Anhui, China
2.
Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China

Received Date: 2017-11-17
Rev Recd Date: 2018-05-15

Available Online: 2019-02-25

Publish Date: 2019-03-01

Abstract

Abstract

A new wavelength-time mapping linear chirped fiber Bragg grating (LCFBG) sensor is proposed, to resolve the problems in which the LCFBG needs to be entirely destroyed and be damaged accordingly to the reflective position for the longer wavelength prior to the shorter wavelength in the intensive LCFBG sensor. In this sensor, the reflective spectrum of the LCFBG destroyed by the detonation and the shock wave is transferred into the same temporal pulse by the high-repetition rate mode-locked laser and the dispersive fiber, which is then used to obtain the length of the LCFBG. The time-resolution and the relative uncertainty of the wave-front position in this sensor are analyzed and their values are found to be 10 ns and 1.7%, respectively. For the data analysis, the experimental data is transformed to 2D image and the wave-front position of the detonation and the shock wave is calculated from this 2D image. The detonation speed of the JB-9014 explosive is linearly fitted to be 7.58 km/s from the wave-front position of the detonation, which is coincidental with the electrical pin’s result of 7.63 km/s (relative error less than 1%).
- linear chirped fiber Bragg grating,
- high-repetition rate mode-locked laser,
- wavelength-time mapping,
- chirped rate,
- reflective spectrum

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References(12)

References

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