Laser fire initiating explosive device optical window in double-self-focusing lens structure

Abstract

The invention relates to a laser fire initiating explosive device optical window in a double-self-focusing lens structure and belongs to the optical window design of laser fire initiating explosive devices. The optical window overcomes the technical defects of the traditional laser fire initiating explosive device optical window in the prior art, the reduction of the laser radiation power density can be avoided, the entrance of proportional reflecting light into a detection optical fiber can also be ensured, and the consistency of the reflectivity of each fire initiating explosive device is improved. The window comprises a laser device, an ignition optical fiber, a detector, a detection optical fiber, a first self-focusing lens and a second self-focusing lens, wherein the laser device is connected with the first self-focusing lens through the ignition optical fiber, the detector is connected with the first self-focusing lens through the detection optical fiber, the first self-focusing lens and the second self-focusing lens are in parallel arrangement, and in addition, optical axes are coaxial. The laser fire initiating explosive device optical window has the advantages that the ignition laser power density is kept, the ignition reliability margin is ensured, in addition, the reflectivity randomness of the optical window is effectively reduced, the quantitative detection of the reflecting light is favorably realized, and the validity of the continuous detection of the optical path is further improved.

Description

technical field [0001] The invention belongs to an optical window design of a laser pyrotechnic product, in particular to an optical window of a laser pyrotechnic product with a double self-focusing lens structure. Background technique [0002] In the laser ignition system, the laser energy is transmitted to the surface of the ignition agent of the laser pyrotechnics through the optical fiber, thereby detonating the pyrotechnics. The self-detection function of the laser ignition system requires the detection of the continuity of the optical path, so a laser pyrotechnics optical window is required to reflect part of the incident light to the detection fiber, and quantitatively detect the light reflected from the surface of the pyrotechnics into the detection fiber through photoelectric conversion Power, so as to judge the continuity of the optical path. [0003] The traditional optical window of laser pyrotechnics is a wedge-shaped flat glass located between the ignition age...

AI Technical Summary

Problems solved by technology

This kind of optical window has a simple structure but significant disadvantages: the laser output from the ignition fiber has a certain divergence angle. After the laser passes through the optical window, the laser radiation area increases and the energy density of the laser radiation decreases, which leads to an increase in the ignition threshold power of the laser and a The reduction of the ignition reliability margin; and this structure is very unfavorable for the self-detection function, that is, in this structure, the reflectivity of each pyrotechnic product is very random, making it difficult to formulate a quantitative criterion for the continuity detection of the optical path

Images