Siheyuan: I eat melons while doing scientific research

Chapter 1111 How might the enemy improve? (Today I can only read it in 4k, please refer to the author's words at the end of the chapter for details)
"How do we prevent this?" This was the first question asked by the comrades from the relevant units. This was actually within Gao Zhendong's expectations. After all, we should first solve the problem and then talk about how to get out of it.

Gao Zhendong's answer is not complicated: "It's actually very simple. There should not be anything around that can obviously vibrate and directly respond to acoustic vibrations, and the object cannot be too smooth."

His words sounded somewhat professional, and his comrades were confused when they heard them. What was this response and what was this smooth?
Everyone understands this, but in this situation, we need to ask for clarification.

"Can you explain it in detail?"

Gao Zhendong nodded: "Yes, OK. Direct response to acoustic vibration means that according to the vibration of sound in the air, regular corresponding vibrations are generated. The principle of this thing is actually not complicated. Sound will produce corresponding vibrations on the window glass, and lasers can easily detect such vibrations."

"Why laser?" The comrades were very curious. They had to understand the principle behind this thing. They couldn't just go to such a big expert for trivial matters.

"With good monochromaticity and less energy dissipation, the feedback on vibration is most obvious. Of course, it is not necessarily laser, but mainly a matter of wavelength. A small enough wavelength can produce sufficiently accurate feedback on vibrations at this level on the glass. Theoretically, electromagnetic waves can also be used, but it is more difficult to capture and quantify electromagnetic waves than lasers because the energy dissipation is more serious. Let's put it this way, in terms of the output and feedback ratio, lasers are almost worth every penny, but radar waves may be worth every cent."

Although Gao Zhendong's words were a little bit unprofessional, his final example clearly explained the matter to his comrades.

Well, to put it simply, it is because of the characteristics of lasers that only lasers can be used. In theory, other electromagnetic waves can also be used, but electromagnetic waves are more difficult and the technical difficulty is high.

This made the comrades think about one thing, why Gao Zhendong could find this thing through a small light spot. This thing is now the best in the world. If Comrade Zhendong says he is second, few people dare to say they are first. This is not only a theoretical ability, but also has application.

Don't forget that laser ranging, laser gyroscope, laser guidance... all these applications were developed under the leadership of Comrade Zhendong. He can not only propose routes and theories in theory, but also solve problems in specific technical details. In the field of laser, if he says it is not possible, it may not necessarily be impossible, but if he says it is possible, then it is basically a done deal.

At least the comrades heard two most important points in Gao Zhendong's words.

First, laser is the most suitable one now, but others may not be suitable.

Second, in the long run, radar actually has theoretical potential.

These two sentences are simple to say, but people who know the business know that there are not many people in the world who can make these two statements.

"Well, Comrade Zhendong, we understand what can be done, so I would like to ask, how to prevent this technology?" Let's not talk about full-band protection, at least we can protect against the laser problem first.

Gao Zhendong thought for a moment: "This matter is actually very simple for a fixed place. Even if there is no way, as long as the place where we speak is deep enough and there is no place where we can be shot directly, we can protect ourselves."

"What about a place that is fixed but can't be hidden too deep?" After all, not every place can be hidden too deep.

"It's actually very simple. Just eliminate the vibration or prevent it from being transmitted. There are several ways..."

The leader of the Defense Work Committee laughed when he heard this. It was still Comrade Zhendong's habit to give you many options at once and let you choose. The key is that he has the ability to give so many options.

However, he did not interrupt Gao Zhendong as there was no need, and Gao Zhendong continued to explain.

"First, laminated glass and hollow double-layer glass. If it is a hollow double-layer, it is best to have separate double layers, or integrated broken bridge glass, or arrange a layer of isolation medium outside the glass."

Laminated glass and hollow double-layer glass are easy to explain, but thermally-insulated glass makes everyone a little confused. What the hell is this?
"Broken bridge glass?" A comrade from the relevant unit asked this question.

Gao Zhendong knew he was talking about his past life again. He thought about it and said with a smile, "This is something I named myself. Under the premise of integration, the outer layer and the inner layer are separated by a material with completely different physical properties."

In fact, broken bridge glass is mainly used for heat preservation and warmth retention, and appears in home decoration. In Gao Zhendong's previous life, this term mainly appeared on aluminum alloy windows. The aluminum alloy double-glazed windows are separated from the inside and outside by plastic components. The "bridge" here means "bridging", so that the heat will not be conducted away quickly, because the plastic component separating the middle is not a good conductor of heat.

But it doesn’t matter here, because he was the one who brought it up first, and he has the right to interpret it. If it can isolate heat, then can’t it isolate vibration?

The main thing is "break", as for what the "bridge" is, that is another matter.

"Oh, I see. Then the curtains inside are also useful, right?" The comrades from the relevant units were not completely ignorant and could draw inferences from one example.

Gao Zhendong nodded: "It is indeed useful, but if it is an internal curtain, then the curtain should preferably be connected to the ground."

The reason why he said this is very simple. The key is to isolate the vibration transmission medium. The curtain is grounded, so the curtain bears the first wave of vibration caused by the sound. Moreover, the toughness of the curtain means that very little of its vibration is transmitted to the glass.

"Yeah... I understand..." The leader of the relevant unit nodded, and the comrades around him took notes quickly.

This is all solid info, opinions from top experts in the field.

While they were taking notes, the leaders of the relevant units were also busy: "Comrade Zhendong, what if he is temporarily away from home?"

This question is very important. If you are away from home temporarily, you may not have the conditions for this and you may not even be able to find a curtain.

Gao Zhendong was confident: "Is that so? Actually, it's not that difficult. If there are curtains, find some. If there are no curtains, find some paper and use water as adhesive to stick it on the window glass."

So simple? The comrades were a little surprised.

"Is that enough?" This is the common voice of the comrades.

Gao Zhendong nodded: "Yes, that's fine. This paper is not actually used to block sound. Its main function is to hang water on the window. Don't underestimate it because it is just a thin layer of water. With the elasticity of this layer of water, it can basically ensure that the vibration will not be transmitted to the glass. The key is that the glass is uniform on this scale, while the paper hung with water is uneven, and the vibration pattern is not that strong. Let's put it this way, here, the water becomes a spring, and the paper is the skeleton of the spring."

In fact, as long as we analyze it from the principle, the problem can be easily solved.

Moreover, the examples Gao Zhendong gave were very intuitive and vivid, and everyone understood them.

As the comrades nodded, a comrade from the relevant unit asked a very interesting question.

"Comrade Zhendong, what if the enemy improves this technology?"

This is very interesting, especially when facing someone like Gao Zhendong.

Gao Zhendong laughed. Others might not be able to explain the improvement of technology, but he knew it, especially after he had just seen the pile of captured bits and pieces. "Well, this thing, let me use this captured equipment as an example."

His words were very interesting. The comrades all laughed and paid special attention to them.

Gao Zhendong did not stop talking: "First of all, this thing is too big. Based on the style of the equipment, I can tell where it came from. People with poor skills can't make it. There are not many companies with good skills that can make something this big and bulky."

The comrades laughed even harder. Comrade Zhendong's words were very profound.

But some people heard a lot from Gao Zhendong's words.

"Comrade Zhendong, if, if, based on the technology you have, how big should this thing be? How can it be realized?"

Haha, speaking of this, Gao Zhendong is no longer sleepy.

"If we follow the domestic technology, we can have one this big right away, but given half a year, it will only be a quarter the size at most!"

The comrades were very surprised. Where did this thing come from? Everyone knew that in the comrades' opinion, this thing was already top-notch. The key was that it could achieve remote monitoring with this size, which was already amazing.

However, some comrades had different ideas, such as the leader of the Defense Work Committee, who knew Gao Zhendong's abilities.

"How to achieve it?" the leader of the Defense Work Committee asked immediately.

"First, this laser has problems. It is too big and too obvious. If we use domestic technology, the laser body can be only about 1/10 of this laser if necessary. Moreover, the laser is invisible to the naked eye!"

"Can't see it?" This question made the comrades' emotions fluctuate. You know, this thing was discovered because Comrade Gao Zhendong found a very faint light spot on the window.

"Yes, lasers are not necessarily visible to the naked eye. I don't know why the other party chose colored lasers. It may be a technical problem, but the most important thing is that lasers can be colorless, and in this application, the effect is the same."

Ah, it turns out that there can be no color! The comrades became even more excited and no one raised any objections. In the country, Comrade Zhendong in front of them is the most authoritative in this regard.

So their problem has nothing to do with color. It’s enough to know that there is no color. The key lies in something else.

"Then why do you say it can be made very small?"

Gao Zhendong smiled and said, "Within this power and wavelength range, we can make lasers without color, and the laser head can be as small as a thumb."

Gao Zhendong gave a very vivid example. No matter how big other things are, even if you tell them the specific size, some people may not have a specific feeling, but when it comes to the thumb, everyone can feel it.

How big is a thumb? Even if people's thumbs are different in size, the overall size will not differ too much. It is said that the thumb is big. Even a big thumb is small compared to this thing that was seized.

"So small?" Some comrades even seemed a little unconvinced.

Gao Zhendong nodded: "Yes, it is that small. There is a kind of laser called semiconductor laser. This kind of laser is easy to use and very small in size. I have arranged for my colleagues to make similar lasers. They were not originally prepared for this purpose, but they can be used."

Semiconductor lasers. After starting optical fiber, Gao Zhendong simultaneously started research on semiconductor lasers, and has achieved certain results so far.

Hmm? You've already prepared this?
However, the leader of the Defense Work Committee was not surprised. He knew that Gao Zhendong was dealing with a lot of things, and they generally had a wide range of applications.

The comrades from the relevant units were very excited. They didn’t understand much else, but they understood one thing: according to domestic technical capabilities, they can now have equipment of the same size, and if they wait half a year, even more concealed equipment will appear.

It doesn’t matter how big or heavy it is, what matters is that it can be more concealed.

"Then how can the outside party improve this thing? Will it affect the response strategy you mentioned?"

This is a very interesting statement.

But Gao Zhendong understood: "In fact, if I were to improve it, there would be a lot of room for improvement. The details may not be conceivable now, but in theory, there are many areas that can be improved."

"How to change it?" The comrades were very direct. They didn't talk about anything else and asked directly.

Some do not need to be modified. The long receiver of this eavesdropping device has already taken certain issues into consideration. After all, the Russians are not stupid. This receiving device can eliminate certain interference from external light sources.

But for some things, based on the knowledge Gao Zhendong had from his previous life, there was a lot he could say.

Gao Zhendong said: "First, this thing will receive a lot of noise at the same time, which will reduce the reception effect."

All the comrades agreed with this statement. They also listened to the results of the confiscated recording equipment, which was really terrible.

They listened to Gao Zhendong's words very carefully, as he was the world's top expert in laser.

But they were wrong. What Gao Zhendong wanted to say actually had nothing to do with the laser itself.

"So, if it were me, the first thing I would do would be to add another receiving device and compare the signals received by the two receiving devices. By retaining the common signals, I could eliminate noise interference to a certain extent."

This is actually the method he used in his previous life, with noise-cancelling headphones and noise-cancelling calls. Two microphones are used to cancel out a certain amount of noise by receiving signals from the two microphones.

"What about the second one?" the comrades were very anxious.

"The second thing is to add polarizers to the optical windows of outgoing and incoming light, and use the polarization direction of the laser to establish a light screening mechanism."

Polarized light? Many comrades don’t even have this concept, but this does not prevent them from understanding Gao Zhendong’s words.

(End of this chapter)