Velocity of Detonation (VOD) is an important measure characteristics parameter of explosive material. The performance of explosive invariably depends on the velocity of detonation. The power/ strength of explosive to cause fragmentation of the solid structure determine the efficiency of the Blast performed. It is an established fact that measuring velocity of detonation gives a good indication of the strength and hence the performance of the explosive. In this survey various VOD measurement techniques such as electric, nonelectric and fibre optic have been discussed. To aid the discussion some commercially available VOD meter comparison are also presented. After review of the existing units available commercially and study of their respective merits and demerits, feature of an ideal system is proposed.
Detonation velocity is an important property to consider when rating an explosive. It is an established fact that measuring velocity of detonation gives a good indication of the strength and hence the performance of the explosive. This paper presents and discusses the design and implementation of continuous wire discrete resistance VOD measuring technique (sensor)for bulk explosives. In this technique step change in resistance is preferred to increase the system reliability as well as it reduces the system complexity. Sensor used in discrete point's method is based on resistance change in the region of several kilo ohms improving the noise immunity.
Velocity of Detonation (VOD) is the most important property to consider when rating an explosive. It is an established fact that VOD gives a good indication of the strength and hence the performance of the explosive. Detonation Sensor is the most critical part of the VOD measurement system. This paper presents and discusses various practical and field implemental techniques for sensing detonation wave with detailed study of electrical ionization principle using resistance sensor for VOD measurement. In this technique effort is made to overcome the limitation of continuous wire sensor and discrete points sensor under various practical conditions. Step change in resistance is utilised to increase the system reliability, improve noise immunity as well as to reduce the system complexity.
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