Optical window based on double-self-focusing lens structure

Abstract

The invention belongs to the field of laser initiating explosive devices, and particularly relates to an optical window based on a double-self-focusing lens structure. The optical window comprises anignition laser, a detection laser, an optical switch, a photoelectric detector, a first self-focusing lens, a second self-focusing lens and a sapphire transparent window, wherein the ignition laser isconnected to the optical switch through an ignition input fiber and a detection input fiber correspondingly, the optical switch is connected with the first self-focusing lens through the ignition optical fiber, the photoelectric detector is connected with the first self-focusing lens through the detection optical fiber, the second self-focusing lens and the sapphire transparent window are sequentially placed behind the first self-focusing lens, and optical axes of the first self-focusing lens, the second self-focusing lens and the sapphire transparent window are coaxial. According to the optical window, the technical defects of an existing laser initiating explosive device optical window are overcome, the laser radiation power density is avoided, a certain proportion of detection light isguaranteed to enter the detection optical fiber, the consistency of the reflectivity of the initiating explosive devices is improved, and the capability of the chamber pressure resistance of the optical window is improved.

Description

technical field [0001] The invention belongs to the field of laser pyrotechnics, in particular to an optical window based on a double self-focusing lens structure. Background technique [0002] In the laser ignition / detonation system, the laser transmits energy through the optical fiber to the surface of the ignition agent of the transducer element, thereby igniting or detonating the pyrotechnics. The laser ignition and detonation system requires detection of the continuity of the entire optical path system, so a laser pyrotechnics optical window part is required to reflect part of the incident light of the detection light to the detection fiber, and quantitatively detect the reflection from the optical window into the detection fiber through photoelectric conversion The optical power of the detected light can be used to judge the continuity of the entire optical system. [0003] The traditional optical window of laser pyrotechnics is a circular flat glass located between t...

AI Technical Summary

Problems solved by technology

This kind of optical window has a simple structure but has many disadvantages: there is a divergence angle for the laser. After the laser passes through the optical window, the spot area increases and the power density decreases greatly, which in turn requires a large laser ignition threshold power and ignition reliability for successful ignition. Margin reduction

Moreover, this structure is not conducive to the self-inspection of the optical path system, that is, in this structure, the reflectivity of each pyrotechnic device is very random, making it difficult to formulate a quantitative criterion for the continuity detection of the optical path

When igniting, the chamber pressure generated by the agent in the igniter is relatively high, which will easily damage or shatter the optical window of the self-focusing structure, resulting in a drop in chamber pressure or even ignition failure, and may cause damage or destruction to the optical devices and optical fibers at the front end

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