Dynamic pressure measurement of shock waves in explosives by means of a fiber Bragg grating sensor

P. G. van 't Hof; L. K. Cheng; J. H. G. Scholtes; W. C. Prinse

doi:10.1117/12.725258

11 January 2007 Dynamic pressure measurement of shock waves in explosives by means of a fiber Bragg grating sensor

P. G. van 't Hof, L. K. Cheng, J. H. G. Scholtes, W. C. Prinse

Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 62791Y (2007) https://doi.org/10.1117/12.725258
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China

Abstract

A new technique for the dynamic measurement of detonation pressures by use of a Fibre Bragg Grating (FBG) sensor is reported. A variation in pressure changes the wavelength of the FBG reflected light. In a detonation, the shock wave passes the explosive with a velocity of ca. 7 km/s and the pressure builds up to ca. 20 GPa within 100 ns, so huge differences in pressure exist in a small area. To prevent measuring the average pressure in a few mm, short FBG with a length of about 0.5mm is developed by Hongkong PolyU and is inserted in the explosive. The light reflected by the FBG is sent to a fibre optic Mach-Zehnder interferometer with a 3x3 beam combiner. Pressure induced wavelength shift will cause a phase change of the interferometric signal. Using the 3 output signals of the interferometer, the phase can be calculated. Interaction between the FBG and the ionization light generated by the shockwave is also demonstrated.

Citation Download Citation

P. G. van 't Hof, L. K. Cheng, J. H. G. Scholtes, and W. C. Prinse "Dynamic pressure measurement of shock waves in explosives by means of a fiber Bragg grating sensor", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62791Y (11 January 2007); https://doi.org/10.1117/12.725258

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