Chapter 404: The Gyroscope That Cannot Be Built
Gao Zhendong received a call from Yu Yuncheng, in which he told him about the plan to change the sampling plan during the trial production of the third batch of mercury cadmium telluride crystals.

He agreed with this move: "Well, your consideration is very reasonable. Since the first two batches have shown the general relationship between crystal growth and time, your adjustment now is very appropriate and necessary. We must figure out the specific process during the period when the changes were most drastic."

With Gao Zhendong's affirmation, Yu Yuncheng continued his experiment with confidence.

Gao Zhendong, who had learned about Yu Yuncheng's current experimental progress and specific product conditions, was also very satisfied. Judging from the news and data he had received so far, the content of the paper in his previous life was still very detailed and reliable. As far as the mercury cadmium telluride crystal was concerned, everything was moving in the expected direction.

This matter involves several of his arrangements, and nothing can go wrong.

After hanging up the phone, a comrade from the third factory office came in with a few people and said someone was looking for him.

Gao Zhendong looked up and was surprised by the big job.

He asked the people from the factory office to leave, and they no longer had to make tea, as he was used to doing it himself anyway.

Then he made a phone call to the Internal Security Section 5. After serving as deputy section chief of the Internal Security Section 2 for a period of time, Xie Jianye was transferred to the newly established Internal Security Section 5 as deputy section chief. This section was responsible for the work of the third factory.

An old deputy section chief is the section chief, and Xie Jianye is the deputy section chief. This can be regarded as another way of the old leading the new. Xie Jianye does not have enough experience in internal security work and still needs someone to guide him.

The Internal Security Unit 5 immediately and quietly sealed off the perimeter of Gao Zhendong's office.

After doing all this, Gao Zhendong made tea and said to the visitor with a smile: "Brother Zhang, it's rare to see you."

The person who came was none other than Senior Brother Zhang who was working on the ballistic missile guidance system in the desert, so when Gao Zhendong saw him, he secretly thought that he was in for a big job.

In any case, it is impossible for Senior Brother Zhang to make a special trip to the capital just to play with him. There must be something important.

Senior Brother Zhang took the teacup and said, "It's rare to see you, but you have to see me. You know I wouldn't come to you to chat for no reason. This time, I came to consult you about something."

Senior Brother Zhang did not waste any time and directly stated his purpose.

Gao Zhendong waved his hand first without saying anything specific. Seeing him like this, Senior Brother Zhang didn't say anything either.

After a while, the phone rang. It was Gao Zhendong from the Internal Security Unit 5. Their work had already been arranged.

Gao Zhendong then said, "Well, Senior Brother Zhang, you can speak now."

Senior Brother Zhang was impressed by Gao Zhendong's move: "You are really careful."

Gao Zhendong smiled and said, "Brother Zhang, I may not show this courtesy to others, but you must be treated with the highest courtesy."

The two of them smiled knowingly, and then Senior Brother Zhang explained the purpose of his visit.

"Junior brother, you know about the first record of anti-ship missiles, right?"

Gao Zhendong nodded: "Yeah, I know." Not only did he know, he also took a sign.

"To be honest, I came here this time because I saw the battle examples and the information about strapdown inertial navigation in the internal scientific and technological intelligence bulletin. I was very interested. We have already asked the Anti-Ship Missile Research Institute for relevant information. I saw that you were the initiator and the principle came from you, so I came here."

Gao Zhendong was a little puzzled. "Brother Zhang, to be honest, I just gave the principle and provided the computer. The specific implementation work was done by the research institute on its own. If you come to me, it would definitely be better for you to digest their information directly."

Mr. Zhang shook his head. “Their research results are important, but as the initiator, your ideas are also important. After all, their environment and requirements are different from ours. Maybe your original ideas are richer, but it is also possible that they discarded some of them because they could not use them or could not achieve them.”

Information may be lost or erroneous during transmission. For a new technology, it is very important to listen to the opinions of the original creator, even if he or she does not personally do any specific implementation work.

Gao Zhendong also understood this truth: "Well, then what are you interested in?"

Mr. Zhang said: "The possible applications of this strapdown inertial navigation technology in our work, application prospects, key points, etc. Or in other words, you can say whatever you want to say, I am interested."

To be honest, Gao Zhendong was not very clear about such a specific thing. He thought about it and poured a bucket of cold water on it first.

"Brother Zhang, in my opinion, strapdown inertial navigation is a very promising inertial navigation technology for you now, but it is only a prospect now. There may still be some problems before you can use it."

On the way here, Mr. Zhang had already digested and absorbed the information he had received. He was obviously mentally prepared for this. He was not very frustrated when he heard this: "Well, can you be more specific?"

He discovered some problems, and now he wanted to see if he could generate any sparks from this originator. As for solving them directly, he did not have any high hopes, as things were not that easy.

Gao Zhendong did not answer directly, but asked a question: "Brother Zhang, you should have studied and digested the information you received. Do you think the strapdown inertial navigation system used in anti-ship missiles is suitable for your needs?"

That's the problem! It seems that Senior Brother Gao has already thought about this!

"To be honest, it is not applicable in the current situation because of the sensor itself. The cumulative error is too large." Gao Zhendong nodded: "Yes, the cumulative error of this system is quite large. The reason why anti-ship missiles can be used is because they have active radar seekers as terminal guidance, but you probably don't have this condition."

The two did not explain why there was no such condition. Mr. Zhang just nodded very honestly: "Yes, there is no such condition."

Don't say that we don't have this condition. The strategic ballistic missiles at that time did not have this condition. Although the original probability error of 1500 to 3000 meters of the later War Drum II seems very large, to put it another way, we can know that this is actually very rare.

Its deviation is only one to two thousandths of the range.

Doesn’t it feel much better when you look at it this way?

As for mechanical gyroscopes, even if we don't consider the inertial platform, apart from the requirements of manufacturing accuracy, there is actually a simple and plain truth - the bigger the size, the better the effect.

Under the same manufacturing precision, the larger the size, the smaller the relative error, not to mention the differences in rotational stability and so on.

But it is obvious that the size of a gyroscope cannot be increased infinitely. Considering the range of ballistic missiles and the required accuracy, the installation space for one set of gyroscopes is already a bit stretched, let alone three sets.

Therefore, although anti-ship missiles can be used, ballistic missiles may not be used at this stage.

Gao Zhendong listened to Senior Brother Zhang's affirmative answer and nodded: "So with the current technical conditions, the strapdown inertial navigation system of the mechanical gyroscope is of little significance to you. Instead of focusing your energy on this, you might as well work hard to develop a high-precision gyroscope."

For strapdown inertial navigation, it will only shine after the non-mechanical rotating gyroscope reaches a certain level.

Mr. Zhang nodded and keenly heard that there seemed to be something behind Gao Zhendong's words.

"Mechanical gyroscopes won't work, Senior Brother Gao, do you mean there are gyroscopes that are not mechanical structures?"

Gao Zhendong was stuck for a moment. He knew of one or two types of gyroscopes that were not mechanical in structure, but it was difficult for him to make them now.

He hesitated, but still spoke: "I have some theoretical considerations, but the conditions are not ripe now, and I don't think it can be built."

Mr. Zhang was very interested in his answer. Just the principle would be fine, at least he could see a way forward.

"You've thought this far? Great! Tell me about it. It doesn't matter if it's mature or not. The key is to point me in the direction of the next step."

I am not afraid of the difficult road, I am afraid of having no road to go.

Gao Zhendong said: "One is to consider MEMS gyroscopes and MEMS accelerometers, which are small in size and expected to have good accuracy, but this technology is very new. You can simply understand it as manufacturing mechanical parts with a size of microns and assembling them into gyroscopes."

The concept of MEMS was only proposed about a year ago, and Mr. Zhang was completely unaware of it. Gao Zhendong gave him a brief introduction to MEMS.

MEMS (Micro-Electro-Mechanical- Systems) is a technology that combines microelectronics technology with mechanical technology. Of course, it is not as abstract as directly building a bunch of gears inside the chip. Generally speaking, the number of mechanical parts in a MEMS chip is not large.

However, its few mechanical parts are indeed manufactured directly into the chip using semiconductor manufacturing technology.

"Hiss~~~~~~"

Upon hearing this, Mr. Zhang immediately took a breath of cold air. He was afraid that this thing would not be useful for the time being. Just hearing the principle made his scalp tingle. It was beyond the limit of his imagination.

Integrated circuit manufacturing is nowhere to be found right now, so it’s a bit too much to think about this.

Good stuff, but too good.

"Is there anything else?" Since what Gao Zhendong just said was some, maybe there are other ways?
Gao Zhendong didn’t quite understand the others, but he did know another one, mainly because it was too famous.

"Brother Zhang, you know the phenomenon of light interference, right?"

Mr. Zhang nodded: "Yes, I know."

Are you underestimating me? Who in Wudaokou doesn't understand this?
"You should also know another phenomenon, which is that when light travels along a closed channel, if the closed channel itself rotates, it will change the light's optical path."

Mr. Zhang thought about it and seemed to be in agreement, and nodded in confusion.

"Then by combining these two phenomena and observing the interference fringes, can we detect the rotation of this closed loop?"

Mr. Zhang was completely stunned when he heard this. I know nothing!
　Chapter 2 is around pm.

　　
　
(End of this chapter)