21 November 1997 Measurement of spectra, pressure, and gas temperature of exotic materials detonated in a vented chamber
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Abstract
The goal of the investigation was to develop experimental techniques for measuring the spectra, pressure and gas temperature of transient optical emission from the detonation of exotic materials in a vented chamber. The measurands are important in characterizing the performance of the materials and in optimization of the mechanical and chemical design. A dual branch multi-channel spectrograph was constructed and calibrated to measure both the time- resolved spectral radiation and total spectral energy from the detonation process. An optical trigger system was designed to synchronize the data acquisition system with the detonation of the exotic materials. Fiber optics were used to isolate the spectrography from the vibration of the detonation and to facilitate the optical alignment of the spectrograph. A quartz pressure transducer and charge amplifier were used to obtain the chamber pressure. The indication of gas temperature was calculated on the basis of temperature calibration and the obtained spectral data. A total of twenty different types of materials were tested. The lifetime of the radiation from the detonation of these materials ranged from 600 microseconds to 1.5 milliseconds, and the wavelength ranged from 400 to 1200 nanometers. The radiation was a continuum superimposed by the lines and bands. The gas temperature derived from the measurements was found to be from 2000 to 3000 degrees Kelvin. The experimental techniques developed for this investigation have proved helpful in comparing the performance of the existing materials and for the design of additional materials.
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Jianming Xu, Jianming Xu, Paul C. McLeod, Paul C. McLeod, } "Measurement of spectra, pressure, and gas temperature of exotic materials detonated in a vented chamber", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); doi: 10.1117/12.279762; https://doi.org/10.1117/12.279762
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