In fields such as explosion mechanics, materials science, and deep space exploration, detonation velocity - the speed at which an explosion or shock wave propagates through a medium - is a crucial and core physical parameter. It is directly related to the energy release efficiency, destructive power, dynamic response characteristics of new materials, and the physical processes of planetary impacts and other events. However, the explosion process occurs in microseconds or even nanoseconds, accompanied by high temperature, high pressure, and strong electromagnetic interference. Accurately measuring its speed is like dancing on the edge of time. The fiber optic probe detonation velocity measuring instrument is a precision ruler designed to complete this ultimate challenge.
Traditional methods for measuring detonation velocity, such as the electric probe method, although have a long history, have many limitations. The electric probe itself belongs to a metal conductor and is highly susceptible to interference in strong electromagnetic pulse environments, leading to signal distortion; Its response speed is limited, and the measurement accuracy for ultra high speed detonation is insufficient; And the installation of probes will cause a certain degree of physical interference to the test area. The emergence of fiber optic probe detonation velocity measuring instruments fundamentally overcomes these challenges, and detonation velocity measurement technology has entered a new era.
The core principle of this system is clever and concise. It uses the optical fiber itself as a sensor, burying or installing one or more specially designed optical fiber probes at predetermined intervals in the material to be tested. When the explosion wavefront propagates at high speed and sequentially reaches various probe positions, the transient high temperature and high pressure will cause a sudden change in the fiber structure of the probe end face, resulting in the instantaneous cutting off or strong attenuation of the laser signal transmitted therein. The system uses high-precision and high bandwidth timers to accurately record the moment when each probe signal disappears. Due to the known physical distance between probes, the average velocity of the explosion wave in this section can be accurately obtained by calculating the time difference between adjacent probe signals, thus drawing a complete explosion velocity variation curve.
The advantage of the fiber optic probe detonation velocity measuring instrument is revolutionary. Firstly, its optical fiber is made of insulated quartz material, which is not affected by strong electromagnetic pulses, ensuring the purity and reliability of signals in complex electromagnetic environments. Secondly, its response speed is extremely fast, reaching sub nanosecond levels, and it can capture the most rapid detonation process, with measurement accuracy far exceeding traditional methods. Furthermore, fiber optic probes are small in size and light in weight, with minimal physical interference to the tested object, and can more accurately reflect the original state of the explosion. In addition, through multiplexing technology, dozens or even hundreds of measurement points can be arranged in a single experiment to obtain a fine spatial distribution of detonation velocity, providing rich data for studying the propagation mechanism of detonation waves.
Nowadays, fiber optic probe detonation velocity measuring instruments have become a standard configuration for top research institutions and military units at home and abroad to conduct explosion physics research. It is like a calm and precise observer, using the speed and precision of light to unveil the mysterious veil of the explosive world that is fleeting but contains enormous energy, driving related science and technology to constantly reach new heights.