CN106568505A - Arc spectrum synchronous real-time scanning linear multichannel acquisition device - Google Patents

Abstract

The invention discloses an arc spectrum synchronous real-time scanning linear multi-channel acquisition device, which comprises an arc current acquisition sensor, a spectrum imaging system, a spectrum acquisition platform, a motion controller, a spectrometer, a spectrum timing detection and trigger circuit, a linear array optical fiber and a computer; Among them, the arc current acquisition sensor is connected with the spectrum timing detection and trigger circuit through the signal line, and collects the arc current signal, the spectrum timing detection and trigger circuit is connected with the external trigger interface of the spectrometer, and the spectrum signal terminal of the spectrometer is connected with the computer through the signal line Connected, and input the spectral signal collected by the spectrometer into the computer; the spectral timing detection and trigger circuit are respectively connected to the motion controller, the motion controller is connected to the motion motor of the spectrum acquisition platform, and one end of the linear array optical fiber is fixed on the spectrum acquisition platform The other end is fixed on the entrance of the entrance slit of the spectrometer.

Description

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

technical field

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

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.

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 spectrum, but also to obtain complete space and time domain information. In the prior art, some researchers regard the plasma as a uniform radiator, and collect the radiation spectrum through a single fixed single-core optical fiber for diagnosis. At this time, the collected spectrum cannot objectively reflect the spatial information of the plasma, and it is difficult to analyze In-depth study of the spatial distribution of plasma.

In order to study the spatial distribution of the plasma, the researchers drive the optical fiber probe through a motor, and use a single-core optical fiber to collect the radiation spectrum in the plasma plane point by point. This method of point-by-point collection is slow and takes a long time. Plasma radiation volatility has a large error. 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.

In another method, the arc plasma is projected onto the slit of a multi-channel spectrometer (MDA) by using an optical imaging mirror group, and the slit is used to collect light, thereby obtaining spectral information on one line at the same time. This method can obtain an in-plane plasma spectrum by driving the imaging mirror group. However, this method requires too complex mirror sets, and the light intensity of the plasma radiation is severely attenuated after being refracted by multiple sets of mirrors, so the signal intensity of the radiation spectrum obtained in this way is often weak.

When collecting the dynamic time domain information of the spectrum, the voltage signal is collected by an industrial computer equipped with a data acquisition card, and the Labview software is used to synchronously trigger the arc state that meets the conditions. This method of synchronous triggering requires a large investment in equipment and complicated methods. At the same time, the literature only output triggers when the arc signal is in the peak state and the base value state, so this method has limitations.

The document "Research on Plasma Behavior and Droplet Transition Control of CO ₂ Laser + Pulse GMAW Hybrid Welding" uses the method of logic judgment circuit to judge the arc state as peak state, base value state and negative current state, and automatically generates a trigger pulse signal, Get the corresponding spectral information. However, this method has no programmability and low flexibility, and cannot trigger spectrometer acquisition for any transient state of the pulsed arc plasma in the peak state and the base state.

To sum up, the existing point-by-point acquisition method has a slow acquisition speed, 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 extraction method requires too complex mirror sets, and the light intensity of the plasma radiation is severely attenuated after being refracted by multiple sets of mirrors. The signal intensity of the radiation spectrum obtained in this way is often weak.

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.

In the process of analyzing and researching the arc radiation, we hope to obtain the time-domain information at any time when the arc is in different states; at the same time, in order to study the distribution of the arc in space, we expect The arc spectral information is collected, compared and analyzed, and the dynamic scanning of the spectral information in the entire arc plane can be realized in the shortest possible time.

Therefore, those skilled in the art are committed to developing a linear multi-channel acquisition device for synchronous real-time scanning of arc spectra.

Contents of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to develop a linear multi-channel acquisition device for synchronous real-time scanning of the arc spectrum, so as to realize synchronous acquisition and research of the plasma radiation at multiple points of the planar arc distribution, and to The whole plane arc is scanned, and the dynamic arc information of the whole plane is obtained in a short time, so as to realize the real-time collection of the arc radiation spectrum information at any different time when it is in the peak or base value state.

In order to achieve the above object, the present invention provides a linear multi-channel acquisition device for synchronous real-time scanning of arc spectrum, including arc current acquisition sensor, spectrum imaging system, spectrum acquisition platform, motion controller, spectrometer, spectrum timing detection and trigger circuit, linear Array fiber optics and computers;

Wherein, the arc current acquisition sensor is connected with the first input terminal of the spectrum timing detection and trigger circuit through the signal line, and collects the arc current signal, and the output terminal of the spectrum timing detection and trigger circuit is connected with the external trigger interface of the spectrometer, and the spectrometer The spectrum signal terminal is connected with the computer through the signal line, and the spectrum signal collected by the spectrometer is input into the computer; the second input terminal and the second output terminal of the spectrum timing detection and trigger circuit are connected with the first output terminal and the first output terminal of the motion controller respectively. The input end is connected, the second output end of the motion controller is connected with the motion motor of the spectrum acquisition platform, the first end of the linear array fiber is embedded in the spectrum imaging system, and is fixed on the fiber holder of the spectrum acquisition platform at the same time, the linear array fiber The second end of the second end is fixed at the entrance of the incident slit of the spectrometer; the spectral imaging system includes an imaging light screen, and the spectral imaging system is connected with the spectrum acquisition platform through the imaging light screen to form a whole.

Further, the spectrum collection platform is a one-dimensional movable spectrum collection platform, and the spectrometer is a multi-channel spectrometer.

Further, the spectral imaging system includes an optical rail, a convex lens, a diaphragm and an imaging screen, the convex lens and the diaphragm are installed on the optical rail, and the center of the convex lens, the small hole of the diaphragm and the center of the imaging screen are on the same straight line.

Further, the convex lens and the aperture are arranged to be movable on the optical guide rail, and the length of the optical guide rail is 1.8-2.3 meters.

Further, the linear array optical fiber is arranged to be composed of a linear array of optical fiber cores, and the linear array of optical fiber cores at the incident end of the linear array optical fiber is embedded in the spectral imaging system, and is set to be on the optical fiber holder of the spectrum acquisition platform at the same time, and can be placed on the The spectrum collection platform moves vertically; the core of the output end of the linear array fiber is vertically arranged and fixed at the entrance of the entrance slit of the spectrometer.

Further, the imaging light screen is fixed on the fiber support of the one-dimensional movable spectrum collection platform.

Further, the core of the spectral timing detection and trigger circuit is composed of a system-level single-chip computer. The spectral timing detection and trigger circuit is set to start the trigger program in the single-chip microcomputer of the spectral timing detection and trigger circuit when the spectrum acquisition platform is in a stopped state. The state is detected and judged, and the spectrometer trigger signal is output when the arc is in the required instantaneous state.

Further, the motion motor of the one-dimensional movable spectrum acquisition platform outputs a low level to the spectrum timing detection and trigger circuit through the motion controller, which is used to stop the spectrum timing detection and trigger circuit.

Further, the motion motor of the one-dimensional movable spectrum acquisition platform outputs a high level to the spectrum timing detection and trigger circuit through the motion controller, which is used to trigger the spectrum timing detection and trigger circuit.

Further, when the motion state signal received by the motion controller is at a high level, the spectrum timing detection and trigger circuit detects and judges the state of the arc through the voltage signal of the arc current acquisition sensor, and outputs a trigger signal to the multi-channel spectrometer to synchronize The multi-channel spectrometer is triggered to acquire arc radiation spectra at multiple points on the same line transmitted through the linear array fiber into the entrance of the entrance slit.

The present invention also provides a linear multi-channel acquisition method for arc spectrum synchronous real-time scanning, including planar dynamic arc scanning, linear multi-channel acquisition and synchronous real-time triggering; wherein

Synchronous real-time triggering includes when the movement of the spectrum acquisition platform is stopped, the spectrum timing detection and trigger circuit trigger program detects and judges the state of the arc, and outputs the spectrometer trigger signal when the arc is in the required instantaneous state;

Planar dynamic arc scanning includes that when the spectral timing detection and trigger circuit triggers the spectrometer to collect the spectral information of the arc in different instantaneous states, the trigger program is terminated, the output motion control signal is pulled to high level, and then the motion controller is started to control the spectrum The motion motor of the collection platform drives the linear array fiber to move to a new collection position;

The linear multi-channel acquisition is realized through the linear array optical fiber. The input port of the linear array optical fiber is set at the center of the imaging light screen of the spectral imaging system, and is fixed on the optical fiber bracket of the spectral acquisition platform at the same time; the output port is fixed at the incident slit of the spectrometer Entrance.

Further, the spectrometer is a multi-channel spectrometer, and the spectrum acquisition platform is a one-dimensional movable spectrum acquisition platform.

Further, the incident port of the linear array fiber is set as the center position of the imaging light screen embedded in the spectral imaging system in which the cores are linearly arranged, and the exit port is set as the cores are vertically arranged and fixed at the entrance of the incident slit of the multi-channel spectrometer.

Furthermore, the dynamic arc is projected on the imaging light screen through the spectral imaging system, and the input port of the linear array optical fiber collects different radiations on the same line at the same time, and after being transposed in the optical fiber, it is transmitted from the output port to the input slit of the multi-channel spectrometer Entrance.

Further, the fiber holder can move vertically, and the alignment direction of the fiber cores at the incident end can be changed.

Furthermore, the core of the spectral timing detection and trigger circuit is composed of a system-level single-chip computer.

Further, the trigger program is set to start the trigger program of the single-chip microcomputer when the motion controller inputs a high level to the first input terminal of the single-chip microcomputer.

Further, the single-chip microcomputer pulls the output motion control signal to a low level, and converts the detected voltage analog signal of the arc current acquisition sensor into a digital signal, and compares the digital signal with the threshold set in the trigger program to obtain the corresponding The rising edge state and falling edge state.

Furthermore, when the single-chip microcomputer detects that the current of the arc reaches the threshold of the rising edge state, the single-chip microcomputer outputs a timing trigger signal to the multi-channel spectrometer to collect spectral radiation information at different instants when the arc is in the peak state.

Furthermore, when the single-chip microcomputer detects that the current of the arc reaches the threshold of the falling edge state, the single-chip microcomputer outputs a timing trigger signal to the multi-channel spectrometer to collect spectral radiation information at different instants when the arc is in the base value state.

technical effect

1. Use the on-chip analog-to-digital converter ADC of the system-level single-chip microcomputer to collect and convert the arc current signal obtained by the arc acquisition sensor, and use the high-speed CPU core of the single-chip microcomputer to perform fast comparison and calculation. By setting certain judgment conditions, it can quickly judge The state of the arc and output a trigger signal that meets the required conditions, so as to ensure that the spectrometer hardware trigger circuit can trigger the spectrometer synchronously no matter when the arc is at the peak value or the base value. The arc radiation spectrum information at each moment is collected in real time;

2. By using multi-core linear array optical fiber and multi-channel spectrometer, it can ensure that the arc radiation spectrum at different positions on the same straight line can be obtained at the same time, so as to analyze and study the linear distribution characteristics of the instantaneous arc spectrum at a certain moment;

3. The one-dimensional movable spectrum acquisition platform is controlled by the spectrum hardware trigger circuit, which can realize the progressive scanning of the entire plane arc and obtain the dynamic arc information of the entire plane in a short time;

4. The arc radiation at different points on the same straight line can be collected simultaneously through the optical fiber of the linear array, and the line scanning of the entire arc plane can be realized by this collection method. By adjusting the direction of the linear array to collect points on a straight line with different orientations, and does not require an overly complex imaging system, avoiding attenuation and errors caused by the optical imaging system;

5. The device of the present invention has programmability, and can trigger the spectrometer synchronously by programming the arc output trigger signal at any time when it is at the peak value or the base value. It is simpler and more flexible to program and control the single-chip microcomputer, the investment is also smaller, and the requirements for hardware and software platforms are very low.

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Description of drawings

Fig. 1 is a schematic structural diagram of an arc spectrum synchronous real-time scanning linear multi-channel acquisition device according to a preferred embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a spectrum acquisition platform device of an arc spectrum synchronous real-time scanning linear multi-channel acquisition device according to a preferred embodiment of the present invention.

Fig. 3 is a timing schematic diagram of a spectrum timing detection and trigger circuit of an arc spectrum synchronous real-time scanning linear multi-channel acquisition device according to a preferred embodiment of the present invention.

Fig. 4 is a schematic block diagram of a spectrum timing detection and trigger circuit of an arc spectrum synchronous real-time scanning linear multi-channel acquisition device according to a preferred embodiment of the present invention.

detailed description

As shown in Figure 1, a preferred embodiment of the present invention provides a linear multi-channel acquisition device for arc spectrum synchronous real-time scanning, including an arc current acquisition sensor 1, a spectral imaging system 2, a spectrum acquisition platform 3, and a motion controller 4 , a spectrometer 5, a spectrum timing detection and trigger circuit 6, a linear array optical fiber 7 and a computer 8; wherein the arc current acquisition sensor 1 is connected to the first input end of the spectrum timing detection and trigger circuit 6 through a signal line, and collects the arc current The arc current signal of the sensor 1, the output terminal of the spectral timing detection and trigger circuit 6 is connected with the external trigger interface of the spectrometer 5, the spectral signal terminal of the spectrometer 5 is connected with the computer 8 through a signal line, and the spectral signal collected by the spectrometer 5 Input computer 8; The second input end and the second output end of spectral timing detection and trigger circuit 6 are respectively connected with the first output end and the first input end of motion controller 4, and the second output end of motion controller 4 is connected with the first input end of motion controller 4. The movement motors of the spectrum collection platform are connected, the first end of the linear array fiber is fixed on the fiber holder of the spectrum collection platform, and the second end of the linear array fiber is fixed at the entrance of the incident slit of the spectrometer.

Wherein the first input end of the motion controller 4 is a control signal input end, and the first output end of the motion controller 4 is a state signal output end. As shown in Figure 1, the control signal input end and the state signal output end of the motion controller are on the same side of the motion controller, and are respectively connected to the second output end and the second input end of the acquisition spectrum timing detection and trigger circuit 6. connect.

The second input end of the spectral timing detection and trigger circuit 6 is connected to the first output end of the motion controller 4, which is used to feedback the start of the motion state control circuit trigger program, and the second output end of the spectral timing detection and trigger circuit 6 is connected to the motion control The first input terminal of the device 4 is used for the spectral timing detection and trigger circuit 6 to control the motion controller 4 to start moving, forming a pair of bidirectional control signals.

The spectral imaging system 2 includes an optical rail 21 , a convex lens 22 , a diaphragm 23 , and an imaging light screen 24 . The convex lens 22, the diaphragm 23 and the imaging light screen 24 are installed on the optical rail 21; the center of the convex lens 22, the aperture of the diaphragm 23 and the center of the imaging light screen 24 are located on the same straight line. The spectral imaging system 2 utilizes the principle of convex lens imaging, and the dynamic arc forms an image on the imaging light screen 24 through the convex lens 22 and the diaphragm 23 . Diaphragm 23 is installed at the rear focus position of convex lens 22 to ensure that only the arc radiation light emitted horizontally can be imaged on the light screen through the aperture of diaphragm 23; the image distance can be adjusted by changing the relative distance between convex lens 22 and imaging light screen 24 to obtain the desired The inverse image of an arc of size . Preferably, the convex lens 22 is a quartz convex lens.

The length of the optical rail in a preferred embodiment of the present invention is 1.8-2.3 meters, preferably 2 meters. The focal length of the convex lens used is 300mm. Through the imaging principle of the convex lens, it is easy to calculate the positions of the convex lens 22, the diaphragm 23, and the imaging light screen 24 on the optical guide rail. For example, when 1:1 imaging is required, the position of the arc is taken as At 0 o'clock, the positions of the convex lens 22, the diaphragm 23, and the imaging light screen 24 are 600mm, 900mm and 1200mm, and the object distance and distance are 600mm (1:1). By adjusting the positions of the convex lens 22, the aperture 23, and the imaging screen 24, the size of the image of the arc can be adjusted, so as to ensure that the arc radiation to be collected is projected into the collection range of the array fiber through the convex lens. In a preferred embodiment of the present invention, 20 220 μm fiber cores are included, and the collection range is 4.4 mm.

The arc current collection sensor 1 converts the collected arc current signal into a voltage signal of 0-3.3V and outputs it to the spectral timing detection and trigger circuit 6 .

When the motion motor of the spectrum acquisition platform 3 starts to move, the motion controller 4 outputs a low level to the spectrum timing detection and trigger circuit 6 to stop the spectrum timing detection and trigger circuit 6; when the motion motor of the spectrum acquisition platform 3 stops moving The motion controller 4 outputs a high level to the spectrum timing detection and trigger circuit 6 for triggering the spectrum timing detection and trigger circuit 6 . Preferably, the spectrum collection platform is a one-dimensional movable spectrum collection platform.

When the motion state signal output by the motion controller 4 is at a high level, the spectrum timing detection and trigger circuit 6 detects and judges the state of the arc through the voltage signal of the arc current acquisition sensor 1, and outputs a trigger signal to the spectrometer 5 for synchronous triggering The spectrometer 5 simultaneously collects the arc radiation spectra of multiple points on the same straight line entering the entrance of the incident slit through the linear array optical fiber transmission in real time.

After the spectrum timing detection and trigger circuit 6 triggers the spectrometer 5 to complete the spectrum acquisition at the position of the linear array optical fiber 7, it stops outputting the trigger signal, and outputs a motion control signal to the motion controller 4, and starts the motion controller to control the spectrum acquisition platform 3 The motion motor drives the linear array optical fiber 7 fixed on the acquisition platform to move in the vertical direction, and inputs a motion state signal to the first input end of the spectral timing detection and trigger circuit 6 . After the linear array fiber 7 moves to a new collection point, restart the spectrum timing detection and trigger circuit 6 to control the multi-channel spectrometer 5 to start a new round of spectrum collection, so as to realize the progressive scanning of the planar dynamic arc spectrum.

The linear array optical fiber 7 is composed of a group of optical fiber cores arranged linearly. In a preferred embodiment of the present invention, the linear array optical fiber 7 is composed of 20 ultraviolet silica cores of 220 microns in linear arrangement. The fiber cores of the incident ports of the linear array optical fiber 7 are linearly arranged and embedded in the center of the imaging light screen 24 of the spectral imaging system 2, and are fixed on the fiber holder of the one-dimensional movable spectrum acquisition platform 3 at the same time, and can be placed on the spectrum acquisition platform 3 Move vertically; the fiber core of the exit port is vertically arranged and fixed at the entrance of the entrance slit of the spectrometer 5 . The optical fiber support of the spectrum acquisition platform 3 is fixed at the center of the imaging light screen 24 of the spectrum imaging system 2 . The dynamic arc is projected on the center of the imaging light screen 24 through the spectral imaging system 2, and the incident ports of the linear array optical fiber 7 are linearly arranged in the core array to simultaneously collect radiation at different points on the same straight line, and are vertically arranged from the exit ports after being transposed in the optical fiber The fiber core array transmits into the longitudinal incidence slit of the spectrometer 5 . Spectra at different positions of the arc can be obtained by moving the fiber holder of the spectrum collection platform 3 vertically; by changing the direction of the fiber core arrangement at the incident end, the spectrum information of multiple points on the arc horizontally, vertically or in any other straight line can be collected.

As shown in FIG. 2 , the imaging light screen 24 is fixed on the fiber support on the one-dimensional movable spectrum collection platform 3 , and the center of the imaging light screen 24 is embedded in the linear array optical fiber 7 . The imaging light screen 24 is, on the one hand, the position of the real image formed by the spectral imaging system 2 , and on the other hand, the interface where the arc radiation light enters the core of the linear array optical fiber 7 . And the arc center, the center of the convex lens 22, the center of the diaphragm 23, the center of the imaging light screen 24 and the center of the linear array optical fiber 7 are all on the same straight line. The image is formed on the imaging light screen 24, and the arc radiation on the linear array to be collected can enter the core of the array fiber embedded in the center of the imaging light screen 24, and finally pass to the spectrometer. The imaging light screen connects the spectral imaging system 2, the spectral acquisition platform 3, and the linear array optical fiber 7 as a whole.

The core of the spectrum timing detection and trigger circuit 6 is composed of a system-level single-chip computer. When the movement of the spectrum acquisition platform 3 is in a stopped state, the trigger program in the single-chip computer is started to detect and judge the arc state, and when the arc is at the required instant output spectrometer trigger signal in the state. The trigger program of the spectral timing detection and trigger circuit 6 is: when the motion controller 4 inputs a high level to the first input terminal of the single-chip microcomputer, the single-chip microcomputer trigger program is started.

A system-level microcontroller (System on Chip, SoC), also known as a system on a chip, is a microcontroller system that integrates part or all of the electronic circuits of the system and contains embedded software. Adopted in the example of the present invention is the F8051 series system-level single-chip microcomputer that Silicon Labs company rolls out, has integrated high-precision analog-to-digital converter (ADC) and its Cygnal-51 core's order processing ability is powerful in its system, can guarantee to reach triggering When the conditions are met, the trigger signal is output in time.

The single-chip microcomputer pulls the output motion control signal to low level, and starts the first timer to control the on-chip analog-to-digital converter ADC to convert the detected voltage analog signal of the arc current acquisition sensor 1 into a digital signal at a sampling frequency of 100kHz , and stored in the register. The CPU of the single-chip microcomputer compares the collected voltage value with the threshold value set in the trigger program, and obtains the corresponding rising edge state and falling edge state. When the single-chip microcomputer detects that the electric current of the arc reaches the threshold value when the rising edge state or the falling edge state is reached, the second timer is successively delayed for different times, and the second input terminal of the single-chip microcomputer outputs a timing trigger signal to the multi-channel spectrometer 6, and the acquisition arc is located at Spectral radiance information at different instants of peak or base value states.

When the single-chip microcomputer triggers the multi-channel spectrometer 5 to collect the spectral information of the arcs in different instantaneous states, the CPU core of the single-chip microcomputer terminates the trigger program, and pulls the output motion control signal to a high level, and starts the motion controller 4 to control the spectrum acquisition platform 3 The motion motor drives the linear array optical fiber 7 to move vertically to a new collection position.

The arc state signal collected by the arc current acquisition sensor 1 , the trigger signal output by the spectral timing detection and trigger circuit 6 , and the spectral data information corresponding to the arc state collected by the multi-channel spectrometer 5 are all input into the computer 8 for storage.

An arc spectrum synchronous real-time scanning linear multi-channel acquisition device of the present invention uses the on-chip analog-to-digital converter ADC of the system-level single-chip microcomputer to collect and convert the arc current signal obtained by the arc acquisition sensor, and uses the high-speed CPU core of the single-chip microcomputer to perform fast Comparison and operation, by setting certain judgment conditions, the state of the arc can be quickly judged and a trigger signal that meets the required conditions can be output, so as to ensure that the spectrometer hardware trigger circuit can be triggered synchronously no matter when the arc is at its peak or at any time. The spectrometer can realize the real-time collection of the arc radiation spectral information at any different time when it is in the peak or base value state; and the use of multi-core linear array optical fiber and multi-channel spectrometer can ensure that different positions on the same line can be obtained at the same time The arc radiation spectrum can be used to analyze and study the linear distribution characteristics of the instantaneous arc spectrum at a certain moment; the one-dimensional movable spectrum acquisition platform can be controlled by the spectrum hardware trigger circuit, which can realize the line-by-line scanning of the entire plane arc and obtain the spectrum in a short time. Dynamic arc information for the entire plane.

The arc spectrum synchronous real-time scanning linear multi-channel acquisition device of the present invention can simultaneously collect arc radiation at different points on the same straight line through optical fibers in a linear array, and can realize line scanning of the entire arc plane through this acquisition method. By adjusting the direction of the linear array to collect points on a straight line with different orientations, and does not require an overly complicated imaging system, the attenuation and errors caused by the optical imaging system are avoided; the device of the present invention has programmability, and can be programmed to The arc output trigger signal synchronously triggers the spectrometer at any moment of peak value or base value. It is simpler and more flexible to program and control the single-chip microcomputer, the investment is also smaller, and the requirements for hardware and software platforms are very low.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (10)

1. An arc spectrum synchronous real-time scanning linear multi-channel acquisition device is characterized in that it comprises an arc current acquisition sensor, a spectrum imaging system, a spectrum acquisition platform, a motion controller, a spectrometer, a spectrum timing detection and trigger circuit, a linear array optical fiber and computer; Wherein, the arc current acquisition sensor is connected to the first input terminal of the spectrum timing detection and trigger circuit through a signal line, and collects the arc current signal, and the output terminal of the spectrum timing detection and trigger circuit is connected to the spectrometer The external trigger interface is connected, the spectral signal end of the spectrometer is connected with the computer through a signal line, and the spectral signal collected by the spectrometer is input into the computer; the second input terminal of the spectral timing detection and trigger circuit and the second output end are respectively connected with the first output end and the first input end of the motion controller; the second output end of the motion controller is connected with the motion motor of the spectrum acquisition platform; the linear The first end of the array fiber is embedded in the spectral imaging system, and is fixed on the fiber holder of the spectrum collection platform, and the second end of the linear array fiber is fixed at the entrance of the entrance slit of the spectrometer; The spectral imaging system includes an imaging light screen, and the spectral imaging system is connected with the spectrum acquisition platform through the imaging light screen to form a whole. 2. A linear multi-channel acquisition device for synchronous real-time scanning of arc spectrum as claimed in claim 1, wherein the spectrum acquisition platform is a one-dimensional movable spectrum acquisition platform, and the spectrometer is a multi-channel spectrometer. 3. a kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 2, is characterized in that, described spectrum imaging system also comprises optical rail, convex lens and diaphragm, and described convex lens and described diaphragm are installed on On the optical guide rail, the center of the convex lens, the small hole of the diaphragm and the center of the imaging screen are on the same straight line. 4. a kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 3, is characterized in that, described convex lens and described aperture are arranged to be movable on described optical rail, the length of optical rail It is 1.8-2.3 meters. 5. A kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 3, it is characterized in that, described linear array optical fiber is set to be made up of linear arrangement of optical fiber core, the fiber of the incident end of described linear array optical fiber The cores are linearly arranged and embedded in the center of the imaging light screen of the spectral imaging system, and can move vertically on the spectrum acquisition platform; the fiber cores of the output end of the linear array optical fiber are vertically arranged and fixed on the spectrometer The entrance of the entrance slit. 6 . A linear multi-channel acquisition device for synchronous real-time scanning of arc spectrum as claimed in claim 5 , wherein the imaging light screen is fixed on the optical fiber support of the one-dimensional movable spectrum acquisition platform. 7 . 7. A kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 6, characterized in that, the core of the spectrum timing detection and trigger circuit is composed of a system-level single-chip computer, and the spectrum timing detection and triggering The circuit is set to start the trigger program in the single-chip microcomputer of the spectrum timing detection and trigger circuit to detect and judge the arc state when the spectrum acquisition platform is in the stop state, and output the spectrometer trigger signal when the arc is in the required instantaneous state. 8. A kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 7, characterized in that, the motion motor of the one-dimensional movable spectrum acquisition platform is sent to the spectrum timing detection by the motion controller The output low level of the trigger circuit is used to stop the spectrum timing detection and trigger circuit. 9. A kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 7, characterized in that, the motion motor of the one-dimensional movable spectrum acquisition platform is sent to the spectrum timing detection by the motion controller The output high level of the trigger circuit is used to trigger the spectrum timing detection and trigger circuit. 10. A kind of arc spectrum synchronous real-time scanning linear multi-channel acquisition device as claimed in claim 9, characterized in that, when the motion state signal received by the motion controller is at a high level, the spectrum timing detection and trigger circuit After detecting and judging the state of the arc through the voltage signal of the arc current acquisition sensor, a trigger signal is output to the multi-channel spectrometer, and the multi-channel spectrometer is synchronously triggered to collect and transmit through the linear array optical fiber into the incident narrow The arc radiation spectrum of multiple points on the same line at the entrance of the slit.