Compact detonation pressure measuring system based on Bragg fiber grating

Abstract

The invention belongs to the technical field of detonation pressure transient measurement, and discloses a compact detonation pressure measuring system based on Bragg fiber grating. The compact detonation pressure measuring system based on Bragg fiber grating includes a broadband light source, an optical isolator, a first optical coupler, a second optical coupler, a third optical coupler, a pressure FBG sensing grating embedded into the tested explosive, a chirped matching grating embedded into the tested explosive, an M-Z unbalanced interferometer, a photoelectric detection circuit, a analog-to-digital conversion circuit, a DSP processor and a fiber spectrometer. The compact detonation pressure measuring system based on Bragg fiber grating senses the detonation pressure by means of the frequency shift effect of the pressure FBG sensing grating on the incident light, and eliminates the optical interference signal which is generated from explosion wave through the chirped grating matching the emission bandwidth, so as to improve the signal to noise ratio. And at the same time, through the fiber spectrometer, the compact detonation pressure measuring system based on Bragg fiber grating calibrates the relation between the sensor pressure and the phase, and compensates and calibrates the initial pressure of the sensor. The compact detonation pressure measuring system based on Braggfiber grating utilizes the compact structure, and can be widely applied to the detonation pressure measurement field.

Description

technical field [0001] The invention belongs to the technical field of detonation pressure measurement in the measurement of the characteristics of high-energy explosive explosion waves, and in particular relates to a compact detonation pressure measurement system based on Bragg fiber gratings. Background technique [0002] Detonation wave is a kind of high-temperature, high-pressure and high-speed shock wave propagating in high-speed chemical reaction zone and high-energy explosive. In the study of blast wave, characteristics and functions of explosives, pressure measurement during explosion is one of the key parameters. The output pressure level is a parameter test to determine the sensitivity of explosives, and the sensitivity of explosives is closely related to its destructive power. [0003] The propagation speed of the detonation wave generated by the explosion is generally 2-12 km / s, and the maximum pressure generated within 10-100 ns can reach 20 GPa, and it quickly...

AI Technical Summary

Problems solved by technology

Therefore, within this small-scale range, the explosion temperature is generally at an ultra-high temperature (3000K), resulting in huge pressure fluctuations

In such an extreme environment of high temperature, high pressure and high speed, it is a great challenge to accurately measure the pressure generated by the detonation

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