Chirped fiber Bragg grating detonation velocity sensing | Academic Article individual record
abstract

An all optical-fiber-based approach to measuring high explosive detonation front position and velocity is described. By measuring total light return using an incoherent light source reflected from a linearly chirped fiber Bragg grating sensor in contact with the explosive, dynamic mapping of the detonation front position and velocity versus time is obtained. We demonstrate two calibration procedures and provide several examples of detonation front measurements: PBX 9502 cylindrical rate stick, radial detonation front in PBX 9501, and PBX 9501 detonation along curved meridian line. In the cylindrical rate stick measurement, excellent agreement with complementary diagnostics (electrical pins and streak camera imaging) is achieved, demonstrating accuracy in the detonation front velocity to below the 0.3% level when compared to the results from the pin data. Finally, an estimate on the linear spatial and temporal resolution of the system shows that sub-mm and sub-μs levels are attainable with proper consideration of the recording speed, detection sensitivity, spectrum, and chirp properties of the grating.

publication outlet

Review of Scientific Instruments

author list (cited authors)
Rodriguez, G., Sandberg, R. L., McCulloch, Q., Jackson, S. I., Vincent, S. W., & Udd, E.
publication date
2013
publisher
AIP Publishing Publisher
identifier
610976SE
Digital Object Identifier (DOI)
start page
015003
end page
015003
volume
84
issue
1