A linear multi-channel acquisition device for synchronous real-time scanning of arc spectrum

Abstract

The invention discloses an arc spectrum synchronous real-time scanning linear multichannel acquisition device. The arc spectrum synchronous real-time scanning linear multichannel acquisition device includes an arc current acquisition sensor, a spectrum imaging system, a spectrum acquisition platform, a motion controller, a spectrograph, a spectrum time sequence detection and triggering circuit, a linear array optical fiber and a computer; the arc current acquisition sensor is connected with the spectrum time sequence detection and triggering circuit through a signal line and acquires arc current signal; the spectrum time sequence detection and triggering circuit is connected with the external triggering interface of the spectrograph; the spectrum signal end of the spectrograph is connected with the computer through a signal line and inputs spectrum signals collected by the spectrograph to the computer; the spectrum time sequence detection and triggering circuit is connected with the motion controller; the motion controller is connected with the motion motor of the spectrum acquisition platform; one end of the linear array optical fiber is fixed onto the optical fiber support of the spectrum acquisition platform; and the other end of the linear array optical fiber is fixed onto the incoming slit entrance of 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 device. 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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