Plasma flame confocal scanning device based on single-mode optical fiber

Abstract

The invention relates to a plasma flame confocal scanning device based on a single-mode optical fiber. The device comprise a scanning objective lens and a focusing objective lens which are sequentially arranged on a three-dimensional micromotion stage, wherein the single-mode optical fiber is arranged behind the focusing objective lens, one end of the single-mode optical fiber is arranged on a focus of the focusing objective lens, and the other end of the single-mode optical fiber is connected with a spectrometer; the three-dimensional micromotion stage drives the light-path part of the device to carry out the confocal scanning of a three-dimensional microdomain to a plasma flame. Part of emission rays emitted from a certain special microdomain of the plasma flame is converted into parallel rays by the scanning objective lens, and is spread for a certain distance before being focused on the single-mode optical fiber by the focusing objective lens; the single-mode optical fiber transmits light to the spectrometer for spectroscopic analysis; and results of the spectroscopic analysis show conditions in the detected microdomain, such as microdomain temperature, gas distribution, and the like. The device greatly simplifies the mechanical structure, reduces the size and has the advantages of simple structure, convenient adjustment and low price.

Description

【Technical field】: [0001] The invention relates to a plasma flame confocal scanning device. The device uses a single-mode optical fiber to replace the pinhole in the traditional confocal scanning device, which can reduce the cost and simplify the instrument structure. 【Background technique】: [0002] Plasma flames are commonly used in processes such as industrial welding, but how to measure the spatial temperature distribution of plasma flames has become the focus of plasma flame applications. The simple, easy-to-adjust, easy-to-use, miniaturized, and non-many accessories requirements of the measuring device are of great significance in the in-situ detection of plasma flames. [0003] The plasma flame is a field light source, and each point of the flame will constitute stray light interference to the detection of other adjacent points. The traditional optical scanning device is mainly composed of objective lens, lens group, ordinary optical fiber or beam row, etc. This dev...

AI Technical Summary

Problems solved by technology

The traditional optical scanning device is mainly composed of objective lens, lens group, ordinary optical fiber or beam row, etc. This device can realize scanning, but the existing problem is that the collected optical signal is the result of multi-level and multi-point synthesis.

The traditional confocal scanning device is mainly composed of an illumination pinhole (emission pinhole), an objective lens, a lens group, a detection pinhole, an ordinary optical fiber or a beam row, etc. The device can perform confocal scanning on every point on the focal plane, The optical signal of the focal point or focal plane can be collected, but the existing problems are that there are too many components and accessories, the adjustment is too complicated, the miniaturization is inconvenient, it is not conducive to on-site in-situ detection, and the cost is high

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