Synchronous real-time scanning linear multichannel acquisition method for arc spectrum

Abstract

The invention discloses a synchronous real-time scanning linear multichannel acquisition method for an arc spectrum. The method comprises steps of planar dynamic arc scanning, linear multi-channel acquisition and synchronous real-time triggering. To be specific, at the step of synchronous real-time triggering, when movement of a spectral acquisition platform is stopped, a spectral time-sequence detection and trigger circuit detects an arc state, and a trigger program determines the arc state. At the step of planar dynamic arc scanning, after the spectral time-sequence detection and trigger circuit completes the operation of triggering a spectrograph to collect spectral information of the arc in different instantaneous states, the trigger program is terminated; an output movement control signal is pulled up to a high level; a movement controller is started to control a motion motor of the spectral acquisition platform; and thus a linear array fiber is driven to move to a new acquisition position. And at the step of linear multi-channel acquisition, the operation is realized by using the linear array fiber; an incident port of the linear array fiber is arranged at an imaging optical screen of a spectral imaging system and is fixed at a fiber support of the spectral acquisition platform; and an emergent port of the linear array fiber is fixed at the spectrograph.

Description

technical field [0001] The invention relates to the field of electronic measurement and control, in particular to an arc spectrum synchronous real-time scanning linear multi-channel acquisition method. Background technique [0002] Welding plasma contains rich information, so it is widely used to study plasma physics and monitor welding process in real time. The temperature and electron number density of the plasma are difficult to obtain by direct measurement methods, and it is often necessary to obtain spectral information through the diagnosis of the radiation spectrum. Therefore, it is very important to obtain reliable spectral information in the study of plasma. [0003] In the spectral diagnosis of the plasma in the welding process, the temperature and electron density of the arc plasma at different positions and at different times in space are also very important. Therefore, it is not only necessary to collect the frequency domain information of the plasma radiation...

AI Technical Summary

Problems solved by technology

However, this method is not programmable and has low flexibility, and cannot trigger spectrometer acquisition for any transient state of the pulsed arc plasma in the peak state and the base state

[0008] To sum up, the existing point-by-point acquisition method is slow in acquisition speed and takes a long time, and has large errors due to the fluctuation of plasma radiation

In addition, when collecting the time-domain information of the spectrum, only the spectral information of a certain point of plasma radiation can be collected, and it is impossible to simultaneously collect and study the plasma radiation of multiple points at the same time.

However, the existing imaging slit light-taking method requires too complex a set of mirrors, and the light intensity of the plasma radiation is seriously attenuated after being refracted by multiple sets of mirrors. The signal intensity of the radiation spectrum obtained in this way is often weak.

[0009] The existing technology only outputs triggers when the arc signal is in the peak state and the base value state when synchronously collecting the planar arc in real time, and cannot trigger the spectrometer for any transient state of the pulsed arc plasma in the peak state and the base value state collection, so this method has limitations

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