Photoelectric probe for detecting laser plasma and use method of photoelectric probe

Abstract

The invention discloses a photoelectric probe for detecting laser plasma. The photoelectric probe comprises photoconductive fiber, a sealed cavity and conductive wires; the photoconductive fiber is led out from the sealed cavity; an optical probe with a hollow tube is arranged at a centre position at the other end of the sealed cavity; an electric probe is arranged at the position parallel to theposition of the optical probe; the electric probe is a tungsten rod; a ceramic wrapping layer is arranged at the outer periphery of the tungsten rod; and the front end part of the tungsten rod is an exposed tungsten electrode of 2-5 mm. A use method of the photoelectric probe comprises the following steps of: processing the acquired spectral signals, labeling exciting elements of each exciting line of a spectrum chart, and calculating a plasma temperature by using a Boltzmann chart method or relative light intensity method; analyzing and calculating the plasma temperature according to a plasma sheath theory based on electric signals; and performing mutual comparison and confirmation. According to the photoelectric probe and the use methodprovided by the invention, an optical detection method and an electrical detection method can be organically combined, so that the multidimensional photoelectric information synchronous detection with high spatial and temporal revolution is carried out on the plasma in the laser welding process; moreover, the photoelectric probe can also be used for detecting a volatile plasma dynamic process and arc plasma.

Description

technical field [0001] The invention relates to a detection device for the laser welding detection process, in particular to a photoelectric probe for detecting the properties of laser plasma in the laser welding process and its application method. Background technique [0002] As an important branch of laser processing technology, laser welding technology has been paid more and more attention due to its advantages of high energy density, small welding heat input and high welding speed. In the laser welding process, photoinduced plasma, also known as laser plasma, will be generated, which has an important impact on the welding process and can even determine whether the welding is successful or not. Metal evaporation will occur inside the laser plasma, and energy radiation, scattering and absorption will have a shielding effect on the laser and directly affect the welding process. The application purpose of the present invention is to detect laser plasma, understand the inte...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that the laser plasma spectrum diagnosis in the prior art is affected by some factors, which is not conducive to real-time quality monitoring due to certain fluctuations in the laser plasma, and to provide a combination of optical probe and Probe-type photoelectric detection device with organic combination of electric probes, synchronous and real-time detection of photoelectric signals of laser plasma cloud (laser plasma outside molten pool) and its use method

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