Impact wave travel time parameter measuring method for single-path optical fiber and device
A technology of parameter measurement and shock wave, which is applied in the direction of measurement device, measurement of propagation velocity, measurement of ultrasonic/sonic wave/infrasonic wave, etc., can solve the problems of increasing experimental cost, difficult measurement, and inconvenient experiment, so as to reduce experimental cost, low cost, Create handy effects
Inactive Publication Date: 2012-01-18
NORTHWEST INST OF NUCLEAR TECH
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However, since this measurement method utilizes the self-luminous principle of the fused silica fiber under impact, and the self-luminous radiation needs to be realized under a very high impact pressure (usually at the GPa level), it is difficult to use this method for small-power explosion experiments. Measurement of Shock Wave Traveltime Parameters for MPa Level Pressure in
In addition, in this method, each probe corresponds to one transmission fiber. In use, multiple transmission fibers need to be arranged in the shock wave transmission channel, and multi-channel signal recording equipment is required to record signals, which brings inconvenience to the experiment and increases the test time. cost
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[0029] exist figure 1 In the shown shock wave travel time measurement device, a transmission fiber 2 is connected to the input end of a one-to-two fiber coupler 3, on which a plurality of shock sensitive units 1 are arranged at certain intervals, and on the fiber coupler 3 The two output terminals of the laser are respectively connected to a laser 4 and a photodetection unit 5, wherein the laser 4 is a repetition frequency pulse laser. The other end of the transmission fiber 2 is exposed to form end reflection.
[0030] Such as figure 2 As shown, the impact sensitive unit 1 is the optical fiber ring sensor head 6, the optical fiber ring is bent by bare optical fiber, and its bending radius is greater than or equal to the minimum bending radius of the optical fiber, wherein the minimum bending radius r 0 It is a parameter that characterizes the minimum bendable degree of the optical fiber, and its value depends on the actual material and process of the optical fiber. Usually...
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The invention discloses an impact wave travel time parameter measuring method for a single-path optical fiber and a device. One transmission optical fiber is arranged on an impact wave spreading passage, a plurality of impact sensing units are arranged on the transmission optical fiber according to certain time intervals, one end of the transmission optical fiber is connected with a heavy frequency pulse laser and a photoelectric detection unit through a one-to-two optical fiber coupler, and the other end of the transmission optical fiber is exposed for forming the end surface reflection. Theaverage spreading speed of impact waves among the sensors is calculated through measuring the distances between the sensors and recording the distortion moment of the heavy frequency pulse sequence signals when the impact waves reach the sensors, and the image sensing unit is an optical fiber ring sensing head or a precut bare optical fiber sensing head, and the like. The method and the device realize the impact wave travel time parameter measurement at the pressure of MPa level and over MPa level and have the characteristics that the structure is simple, the manufacture is convenient, the cost is low, and the like. The experiment cost can be greatly reduced.
Description
technical field [0001] The invention relates to a method and device for measuring travel time parameters of shock waves produced by explosions, in particular to a method and device for measuring travel time parameters of shock waves using optical fiber sensing. Background technique [0002] The traveltime characteristics of the shock wave front play an important role in the analysis of the power and effectiveness of dynamite and other explosives. The common method of measuring the travel time parameters of the shock wave surface is the electrical measurement method, but due to the poor anti-electromagnetic interference ability, it is difficult to measure the travel time parameters of the shock wave in a strong electromagnetic environment. [0003] In "Explosion and Shock" Volume 26 in 2006, "Application of Quartz Optical Fiber Probes in Non-metallic Material Impact Experiments", a device for measuring shock wave travel time parameters with optical fiber probes is disclosed, ...
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IPC IPC(8): G01H5/00G01H9/00
Inventor 陈绍武宇文璀蕾冯国斌邵碧波冯刚王振宝刘福华
Owner NORTHWEST INST OF NUCLEAR TECH
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