Chapter 405: This thing has to be done!
This is a high-tech product that Gao Zhendong was famous for in his previous life - laser gyroscope, which also includes fiber optic gyroscope.
What Senior Brother Zhang feels at this time is probably "A prime number is a number that cannot be divisible by other natural numbers except 1 and the number itself. Okay, now you understand what a prime number is, go and prove Riemann Just guess."
Why not prove Goldbach’s conjecture?
Because Goldbach's conjecture can at least understand the problem and know that it is related to prime numbers; while the Riemann hypothesis cannot even understand the problem, and it seems at first glance that it has nothing to do with prime numbers.
Mr. Zhang was in this state at this time, and he didn't even think about the connection between these people for the time being.
He shook his head, as if he wanted to get rid of the chaotic thoughts from his head, and then calmed down: "Junior brother, no, no, no, your span is too big, you have to deal with it carefully. "
Gao Zhendong is also a little confused. He has to think carefully before he can explain this matter clearly to his senior brother.
He thought through it carefully in his head before he started to draw and talk on the paper.
"Brother, first of all, when two beams of coherent light meet, interference will occur. The specific manifestation is the change of interference fringes, right? When the two beams of coherent light have an optical path difference , will be reflected in the interference fringes.”
Mr. Zhang: "Yes, I understand."
"Then we use the light emitted by the same light source to split the light, transmit it along the forward and reverse directions of a closed optical path, and finally enter the same detection device Can interference occur and interference fringes appear? "
The interference of light requires coherent light, that is, the two beams of light must have the same frequency and a fixed phase difference. This This determines that the light emitted by two different light sources cannot interfere, and must be emitted by the same light source.
This is why students who often do physical experiments, when doing light interference, can see interference fringes through a single light source, then through a single slit, and then through a double slit.
“Well, that’s what happened.”
"Then we put the closed loop of light and the detection mechanism on the rotating plane we want to detect. When the plane rotates, the optical path of one beam of light transmitted in the opposite direction will become shorter, and the optical path of the other beam will become longer. , the optical path difference is positively related to the rotation angle. At this time, by detecting the interference fringes, you will know the rotation angle, right? ”
“Oh, that seems to be the truth!”
Gao Zhendong smiled: "That's right, this thing doesn't need rotating parts like a mechanical gyroscope, and it also needs to maintain a huge moment of inertia to ensure accuracy. It itself does not move. And The startup is very fast. As long as the light path is established, it enters the detection state. Unlike a mechanical gyroscope, there is a startup process. "
How fast the light path is established, basically just turn on the light. ah.
Mr. Zhang looked at the picture drawn by Gao Zhendong, his head spinning wildly, and asked a question: "Then how do I count interference fringes?"
Anyone who often does physical experiments knows that it is a very effective method to convert small changes in physical quantities into interference and diffraction of light for amplification by some means, and to turn changes that are so small that they are difficult to measure into several circles or strips. means.
"Photosensitive element! This is relatively easy to do for photosensitive elements."
Senior Brother Zhang nodded, and a new question came up: "No, in this way , the wavelength range of the light must be very narrow, and the monochromaticity of the light must be very good. Where can I find this light source?”
If we just want to increase the light intensity, can it still be compared within a certain range? If it is easy to do, then improving monochromaticity will not be a miracle by relying on force.
Gao Zhendong smiled: "Brother, didn't we come up with a laser not long ago? The laser just meets this requirement."
Of course, there are many types of lasers, and not all of them are suitable for this job. The most important thing is that the coherence length should be good, that is, how long the transmission distance can still maintain a considerable degree of coherence.
Senior Brother Zhang patted his head: "Yes, yes! This thing is so new, I didn't expect it for a moment! Junior Brother Gao, you have done a good job in understanding and tracking cutting-edge technology."
No, people were following me at the beginning of this thing. Of course, I should have surpassed it now. After all, I just took the title of "No. 1 in the world" and ran away. It was very exciting, but the follow-up work There wasn't much follow up.
But in this matter, Gao Zhendong is not very proud and just said that he invented the laser, so he has to keep it in his heart.
Unable to pretend from this aspect, he decided to pretend in another direction.
"Brother Zhang, I have done preliminary theoretical calculations. This method can detect a very wide range, from 0.001 degrees/hour to 1500 degrees/second, and the response is very fast. In addition, there is no inertial platform, The servo mechanism, torque converter, angle sensor and other moving parts have no mass balance requirements, are not sensitive to the vibration and impact acceleration of the carrier, have a simple structure, and are low in cost. "If I use a word that will become more popular in the future to describe the laser gyroscope. , that is, it is an all-solid-state gyroscope. In theory, it can have no moving parts and anything. As long as the state is fixed, there are much fewer things to consider.
The laser gyroscope is not without its flaws, but those flaws disappear without a trace in the face of its huge benefits.
After hearing this, Senior Brother Zhang was so beautiful that snot bubbles almost came out of his nose: "Yes, yes, all the problems you mentioned can be easily solved because of its structure! Just this, just this. And it's light. Wavelength, optical path, etc. are not affected by temperature, and drift and stability are very good! This thing must be developed!”
Gao Zhendong still gave the senior brother a shot: “But there is a problem. Senior brother, even if you start working on this now, it will still be difficult. You probably won’t be able to use it in a short time.”
Regardless of the principle and design, the biggest trouble with ring lasers is processing. Every optical device involved has certain accuracy requirements.
But Mr. Zhang didn't care: "Haha, it's okay, it's okay, this thing is worth it even if it takes ten or twenty years."
That's not the case, Gao Zhendong thought to himself.
“That’s all I can think of for the time being, but the specific implementation is not what I’m good at. This is not my professional direction. Brother Zhang, you may need to find a relevant scientific research institute to do it. "
Having said that, Gao Zhendong thought about something, and he had to make this clear first: "In addition, interference fringes are just one of the measurement principles, including some of the structural examples I mentioned. The purpose is to obtain the rotation situation by measuring the optical path difference of coherent light emitted by the same light source. When you talk about this principle to specific researchers, you need to explain this matter clearly to them, so as not to limit the specific researchers' ideas. Complete Collection I am focusing on interferometry, maybe there is a better way.”
Mr. Zhang wrote it down truthfully and saw how humble his junior brother was. He did not think that he was the best in the world just because he was the first to propose this idea. Instead, he objectively pointed out that there might be a better way.
Senior Brother Zhang is very satisfied with today's harvest. Let's see, it is better to come to the birthplace of technology to solve the problem. He can be sure that even if the Anti-ship Missile Research Institute knows about his difficulties, they will not be able to solve the problem better. I can't come up with a solution, even if it's a principle-based solution like my junior brother's that can't yet be applied.
Senior Brother Zhang stayed in Gao Zhendong’s house for a long time. After giving Gao Zhendong a nice meal, he returned to the Defense Work Committee to report the situation. Due to the nature of their work, the person he reported to was directly Leader of the National Defense Work Committee.
After hearing what Mr. Zhang had learned from Gao Zhendong, the leader of the National Defense Working Committee was very happy. He had never heard of this thing before.
I turned around and thought, how many of the things in Gao Zhendong’s place have I heard of before?
"What are you going to do next?" He was happy. Although he knew that this technology might take a long time to be put into use, its broad prospects made him immediately decide that he had to do this!
National defense, aviation, aerospace, this thing can be used in a wide range of applications. Apart from anything else, according to the performance range described by Gao Zhendong, once this thing is installed on aircraft, ships and other vehicles, most of the problems of positioning these vehicles will be solved.
When there is no GPS, it does not mean that the vehicle does not know its own position. Technologies such as mechanical gyroscopes, radio navigation, and starlight navigation are all used. However, these technologies are affected by various environmental conditions. Influence.
Mechanical gyroscopes are greatly affected by manufacturing and the motion state of the carrier. They are expensive and cannot be used accurately. Well, according to the direction and speed of the vehicle's movement, determining its own position on the nautical and aeronautical charts is a kind of artificial inertial navigation.
Radio navigation requires the deployment of navigation stations. In these days when radio technology was not very developed, the effect was greatly affected by geographical factors.
As for starlight, guess why it is mostly used on long-range missiles or ships? For vehicles below the stratosphere, this thing depends on the sky. For ships, since the positioning response speed is not high, it is not impossible to use it.
By the way, using a theodolite to locate the sun or celestial body is strictly speaking a form of starlight navigation.
So around the time period of S2, we can often see the plane getting lost and the ship getting lost in various combat cases.
For example, those who have watched the famous Gallic comedy movie "Escape from the Tiger's Mouth" will never forget that at the beginning of the movie, the crew broke through the clouds and looked at the towering iconic Iron Tower. The navigator said jokingly: "Calais!!"
Hearing the leader's question, Brother Zhang wisely did not take over the job. This was not his professional direction. He was only responsible for using: " Leader, can you organize relevant units to study this thing? ”
Two chapters are completed today.
Two chapters will be updated at 6 a.m. tomorrow.
(End of this chapter)