Chapter 211 It has to be Director Gao! (3k)
On Wednesday, Gao Zhendong was correcting his thesis, and Yu Yuncheng came over: "Director Gao, we decided to borrow your help today and try pulling the ruby single crystal first. Come and sit down." "
Gao Zhendong put away his pen: "Let's go and have a look."
It seems that Yu Yuncheng saw that the ruby is very important to the matter in Gao Zhendong's hands. Speeded up the progress.
The two came to the single crystal furnace laboratory. All preparations had been completed. The alumina powder was piled into a steamed bun shape in the single crystal furnace.
People connected two lines from the computer room, one for the monitor and one for the keyboard. The only monitor and keyboard of Gao Zhendong's DJS-59 are here in the laboratory.
Although the distance is relatively long, fortunately the signal level of the equipment at this time is relatively high and the work is quite normal.
The program on the screen was written by Gao Zhendong, and he was very familiar with the interface.
Different from future configuration software and industrial control software where the interfaces are all graphical instruments, in order to save resources, this control program adopts the form of rolling output parameters, which requires the concentration of the staff when working. Slightly higher.
Although Gao Zhendong is not very satisfied with this, Yu Yuncheng and the others think it is very good. A few months ago, they would not have dared to use this thing.
"Director Gao, let's start." Yu Yuncheng smiled.
Gao Zhendong did not refuse and gave the starting command: "Melt!"
The members of the scientific research team pressed the power switch, and amid a "buzzing" sound of electricity, the heat wave Gradually spread out from the single crystal furnace body.
This process is very long and takes one to two hours.
During the process, Yu Yuncheng continued to issue instructions.
"Pay attention to the degree of vacuum."
"What is the furnace temperature?"
"The degree of vacuum is almost exceeding the standard, stop heating." Although the computer is automatically controlling it, Yu Yuncheng still can't bear it. I would like to remind the test personnel that after all, the reliability of machinery and equipment these days is not that good, and necessary human intervention or monitoring is still necessary.
Machine ensures control accuracy, and labor ensures reliability.
The method is crude, but it works.
"The molten material is almost ready. Lower the temperature, raise the crucible, and reduce the power to the seeding power."
The power of seeding is smaller than the power of the molten material, otherwise the fluidity of the material liquid will be too strong and it will not be aroused.
The specific value of this seeding power is different for different materials. They first calculated based on the experience and theory of thermal fields and crystallization given by Gao Zhendong to obtain a relatively small range, and then experimented little by little within this range to find the most appropriate specific values.
Yu Yuncheng and others have already tried out the appropriate value of alumina in their previous work.
"Okay, raise the pot to the seeding position, lower the seed crystal, pass argon gas, and the pressure is 0.Xkg."
Under the control of the seed arm, the clamped seed crystal drops to a few millimeters above the liquid level in the crucible.
“Plant seeds!”
“The temperature is ready, seeding.”
For this accurate seeding temperature, Yu Yuncheng even used Two cut seed crystals.
"Necking."
"Relax your shoulders, okay, let's heat up."
"The diameter is here, turn your shoulders and pull the crystal."
Following Yu Yuncheng's command, the seed arm began to slowly rotate and pull, one The column emitting this incandescent light slowly took shape.
This is not because Yu Yuncheng wants to be this conspicuous person and grab computer jobs, but many of these initial steps rely on human eyes and experience, and computers and control systems cannot do it. This job.
Or to put it another way, at this time, the computer can help control various parameters more accurately, but for a considerable number of nodes in the process, it cannot make decisions, it can only execute and make decisions. , and it has to be a human being.
The crystal begins to grow at a medium diameter by rotating and pulling. During the equal diameter growth process, the equal diameter control also relies on human decision-making, and the computer performs process control.
Seeing that the length is almost more than 10 centimeters, if you pull it further, problems such as polycrystalline and dislocation will appear.
Yu Yuncheng began to greet the staff to finish.
As the slender single crystal tail slowly left the liquid surface, Yu Yuncheng gave the order to stop the furnace.
The furnace shutdown command sounds simple, but it actually includes a series of actions such as turning off the heating power, turning off the atmosphere protection, shutting down the vacuum system, etc.
After a series of busy and orderly actions, the first step of the entire experiment was completed.
The rest will have to wait for an hour or two to cool down before sending it for inspection to see the test results. Although I don’t know the result yet, at least the whole process went smoothly.
Gao Zhendong smiled at Yu Yuncheng: "It looks good, at least there was no accident."
This is not Gao Zhendong's compliment when he has nothing to say. , the entire experimental process seemed to be basically within the control of the scientific research team, and nothing unexpected happened. For a preliminary test, it was actually a success.
Yu Yuncheng wiped his sweat. Although Gao Zhendong designed a camera to face the observation window for easy observation, the effect of these years' cameras is quite average.
In order to protect the safety device, he often had to go to the observation window to look. The heat wave in that place could not be exaggerated.
Yu Yuncheng was also very excited. It was a good sign that he had successfully completed the test process: "Well, it seems that it is right to ask Director Gao to take charge, haha."
Praise, just force it. Hold.
The testers around were all happy, the test went well, and they were naturally in a good mood. After listening to Yu Yuncheng's words, they all felt a bit like "I didn't expect it, I didn't expect it, you thick eyebrows and big eyes" in a future sketch The feeling of "my child can do it" makes me even happier.
While laughing, Gao Zhendong carefully recalled the entire experimental process, and suddenly thought of a question.
"Gong Yu, I have a problem."
Yu Yuncheng was delighted. It was a good thing that Director Gao could see the problem, which meant that the process flow could be optimized again: "Gao Director, you said. "
"I see that some of your other important process nodes rely on manual judgment at this stage. This is normal, because the indicators are not clear and the sensor capabilities are limited, but it is difficult for the machine to make decisions on equal diameters. At this stage of growth, is decision-making and control done manually? It is said that the diameter indicator is relatively clear and accurate."
Yu Yuncheng touched his head: "Director Gao, you are on to something. I am also troubled by this matter.”
"Diameter, you can say it is clear. It is true. But there is a problem. The machine has no way of knowing whether the diameter of the crystal in the furnace has reached the set value. These things are very different to the human eye, but The machine doesn't work."
"The machine doesn't work?" Gao Zhendong frowned, there was a bit of trouble.
“Yes, we can’t get a ruler and put it into the furnace to measure. Let’s not talk about the temperature issue. Once the ruler goes in, it will theoretically contaminate the raw materials. Even if it is cleaned cleanly, the ruler needs to be in contact with Measurement, as soon as you touch the crystal, everything is over.”
Gao Zhendong thought for a while, and it was really the problem he mentioned. To put it bluntly, this is a classic fuzzy control problem, and the current control system is too complicated for it. Or something that is difficult to describe accurately and appears very weak.
No matter how large the diameter needs to be controlled, it is very clear. How thick the crystal grows can also be seen with the naked eye.
But unlike people, machines are invisible, but there is no suitable means to measure the specific diameter data of this crystal.
This is just like whether the clothes are dirty or not. People can tell at a glance whether the clothes are dirty. However, for machines without fuzzy control capabilities, it is difficult to judge. You have to detect various relevant data on the clothes to judge.
This is not the future. In the future, a camera will be enough to draw a detection line in the camera surveillance screen, and there is no need to even use gimmicks like AI.
But the cameras at this time did not have this capability. This thing was purely analog, and there was no such thing as a video server.
Gao Zhendong glanced at the camera, then at the surveillance screen, and suddenly an idea flashed in his head.
Pull the detection line? Got it!
There are no various video tools in the video server, but I have my own way! What Gao Zhendong didn't know at this time was that the crude method he thought of was originally one of the means of controlling diameter in the future when technology was not so developed.
Gao Zhendong laughed: "There is a way!"
Yu Yuncheng and others were overjoyed when they heard this. This equal diameter control is the most labor-intensive in the entire crystal pulling process, but it is also very One of the key processes.
Even for the first few important nodes, the node time is actually relatively short, but this equal diameter control must be watched from the beginning of the shoulder turn to the end.
But in terms of conditions, it seems to be the most promising solution to the problem of switching from manual to automatic, which makes people feel very regretful.
When they heard that Gao Zhendong had a solution, everyone became excited, including Director Gao.
You can solve the small problems, but I will handle the general theoretical, design and technical difficulties!
Everyone looked at Gao Zhendong to see what he had in mind.
Gao Zhendong walked to the camera monitor and smiled: "From this monitor, we can see the diameter of the crystal, right?"
Everyone nodded. Although the camera effect at this time was very average, such a clearly defined image could still be seen clearly. Usually, they mainly performed equal diameter control by observing this monitor.
“But although we can see it, the monitor itself doesn’t know it.” Someone immediately raised his doubts.
Gao Zhendong smiled and said: "Then let's install an eye on the monitor."
"Eye?" No one knew what Gao Zhendong was talking about. Install another one. The camera is staring at this monitor?
Gao Zhendong pointed to the picture on the monitor and said: "On this, is it that the part of the crystal is dark, but the picture around the crystal appears bright because the molten liquid itself emits light?"
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Yu Yuncheng nodded: "Yes, the boundary between the two is very clear, one light and one dark, one can even be said to be one black and one white."
Gao Zhendong smiled: "Then let's install it on this monitor Photosensitive element."
Before he finished speaking, Yu Yuncheng was not engaged in automation, so he had not figured it out yet, but there was such a professional among the testers, and he suddenly realized it.
(End of this chapter)