Chapter 482 The Thermal Imager Getting Closer
"Why does our first generation of self-heating food for individual soldiers taste like Sichuan and Shandong cuisine?" This was a soul-searching question from a leader of a certain army unit that was devoted to eating light, delicious and original food.

"Commander, this way it can be stored for a longer time. Besides, Sichuan and Shandong cuisines tend to use high levels of oil and salt, and are more suitable for strenuous and high-intensity activities." This is the general answer.

The actual situation is that the person who does this is a chef with a double degree from Sichuan and Shandong.

After communicating all the ideas, Gao Zhendong instructed the comrade who was cooperating with him: "Don't write my name on this matter. You can do whatever you want. For the self-heating food, the last two positions will be left vacant. Let Comrade He Yuzhu choose the people at his discretion. You have to listen to him when it comes to cooking."

The comrades from the technical department nodded, thinking that Chief Engineer Gao probably wouldn't think much of these things.

Although Gao Zhendong didn't care, they thought it smelled good. He decided to ask two comrades to help him with the fireless self-heating patch and fill the hole.

"It's good that you understand. Well, go write something simple and hand it over to me for your signature." Gao Zhendong didn't waste time. It wasn't a big deal and he could get started right away. There was no need to hold a meeting or anything like that.

After the technical department comrades left, Gao Zhendong turned to Sha Zhu and said, "I'll call Deputy Director Li later. Then you go find him. Remember, you must tell him that I told you to go find him directly and tell him about this matter. After all, he is a transfer from the logistics system."

Although Gao Zhendong has the right to call on people from the entire factory without affecting production, he still has to give a heads-up.

"Why do you have to say that it was you who asked me to find him?" Sha Zhu was a little confused.

"Because without my words, it would be inconvenient for you to go to him. With this, your logistics director will have to ask you for help."

It's not that Gao Zhendong has to do Sha Zhu a favor, but if he doesn't do so, Sha Zhu will be the first to suffer.

Shazhu was not stupid. He went over the matter in his head, said "Oh~~~~~", and said to Gao Zhendong with a smile: "You guys in the upper echelons are smart and have strict rules."

If Gao Zhendong had not said this, then according to the rules, Sha Zhu would have to find the logistics director or even the canteen director first, and then go to Deputy Factory Director Li. That would be skipping levels and was quite taboo, and it was not in compliance with discipline.

With these words, it was easier for Sha Zhu to explain. This matter was brought to us by the Third Factory, and the initiative also lies in the Third Factory. So, I, Sha Zhu, have to cooperate with whatever the head of the Third Factory says. Otherwise, this good thing may not come to our logistics system. If you have any objections, you can go and talk to Chief Engineer Gao.

For the logistics system of the Third Rolling Mill, being able to truly host a "research project" is undoubtedly extremely rare and a once-in-a-millennium opportunity.

For them, this is a scarce resource, which can be used in any matter. Gao Zhendong directly sent Sha Zhu to Deputy Factory Director Li. His meaning was very clear: Old Li, you will be counted as a share, and for everything else, discuss it with Sha Zhu.

If the logistics director and the canteen director want to get involved, they have to find Deputy Director Li. Deputy Director Li will definitely say, "For this matter, you have to find Master He. He has a lot of say in this matter." And then they can get things done through Sha Zhu. Wouldn't Sha Zhu have gotten the favor?

They don't want to get involved? What a joke! No matter if they want to do practical things or take advantage of the situation, they are definitely looking forward to this matter and would like to replace Sha Zhu with himself.

Of course, Gao Zhendong could also say nothing and wait for Sha Zhu to report to the canteen director. If someone really wants to intercept or make some small moves during the process, Gao Zhendong will stand up for Sha Zhu and slap him in the face, staging a scene where "eight hundred comrades from the technical department outside the canteen shouting 'Welcome back the God of Cooking'."

But this kind of operation is actually quite stupid, it is purely asking for trouble, and it is unnecessary trouble. If you make your attitude clear first, others will understand and naturally know how to cooperate. Instead of having to stir up some trouble, inexplicably make a few enemies, and then run away to show off your cuckold spirit.

If that happens, Gao Zhendong himself will be fine, but Sha Zhu will be basically ruined.

After receiving instructions from Gao Zhendong, Sha Zhu turned around and went to find the comrades from the Technical Department of the Third Factory. Although he was not good at writing materials, there were some things that only he could understand. He was responsible for speaking, and the comrades from the Technical Department were responsible for writing.

Gao Zhendong started this matter and then let it go. He didn't have to worry about the rest.

That afternoon, Liu Rongguo came over.

"Boss Gao, the bismuth telluride matrix has been developed. Take a look."

After saying that, he handed Gao Zhendong a sample encapsulated in a glass tube and a test report.

Gao Zhendong read the test report carefully and found no problems.

"Rongguo, go ahead. Now that we have the substrate, you can make both P-type and N-type semiconductors based on this substrate."

After saying that, he opened the safe and took out some of the instruction materials about the semiconductor refrigerator extracted by the system.

P型半导体是Bi2Te3—Sb2Te3，N型是Bi2Te3—Bi2Se3，都是以碲化铋为基体的三元固溶合金，等到这两个东西都搞好，那剩下的事情就是1274厂的了。

P-type and N-type semiconductors also need to be doped to adjust their thermoelectric potential and thermal conductivity, especially the former.

The last step is the welding and assembly with the guide strips, cold and hot end base plates.

Liu Rongguo had experience in mercury telluride and cadmium, which is actually a ternary solid solution alloy. After getting the description of the two materials, he glanced at them and said confidently: "Mr. Gao, I will finish it as soon as possible." After Liu Rongguo left, Gao Zhendong turned around and called the Research Institute.

"Engineer Lu, how is the sensor that I asked Factory 1274 to process through you?"

"Mr. Gao, it has been made, but there is a problem."

"what is the problem?"

"The 64-unit linear sensor you requested doesn't seem to be a big problem now. The mercury cadmium telluride crystals you provided are all relatively large. But if they become popular, according to the statistical law of calculating the size distribution of mercury cadmium telluride crystals, most mercury cadmium telluride crystals may not be able to make 64 units. There are not enough of them."

Gao Zhendong hesitated for a moment on the phone: "What about Unit 96? What's going on?"

"It is basically impossible to make Unit 96. The comrades at Factory 1274 tried every possible way, but it was still difficult to cut out a sufficient number of mercury-cadmium-telluride particles."

It's like those jade sellers. The raw stone looks quite big, but after removing the cotton, eczema, and cracks on the stone, and leaving aside the ones with poor water content and color, there are not many left.

Fortunately, mercury cadmium telluride crystals are artificial, and their consistency from the outside to the inside and the quality of the crystal structure are far superior to things like jadeite raw stones, otherwise there would be nothing to do.

Gao Zhendong was not surprised: "Well, I expected this. Is there any problem in using two crystals to make a sensor?"

Gao Zhendong's idea is to use two crystals to make 96 infrared photodiodes, and then form a 1*96 linear array. As for the unevenness of the two crystals, he tries to compensate and adjust it through the back-end circuit.

This will add an extra process of calibrating deviations during manufacturing, and the back-end circuit of each infrared photodiode must be designed to be adjustable, because no one knows exactly how much the deviation will be, and corresponding adjustments must be made based on the output of the calibration process.

Although it was troublesome, Gao Zhendong just wanted to know two things.

First of all, he wanted to find out whether the 96*64 pixel thermal imager could be used.

Gao Zhendong had seen lossless high-definition, from 1080P to 4K, but he had never seen the 96*64 full-loss image quality output by this thermal imager.

The lowest-resolution picture he had ever seen was probably the one taken when he was a junior and working on his supervisor's project. In order to ensure low-speed satellite transmission, the 320*240 picture was deliberately compressed. But at least that thing was in color, not grayscale like a thermal imager.

The second is whether the consistency of this top-bottom combined line scan array can reach an acceptable level after back-end compensation.

Gao Zhendong had seen pictures that were destroyed during the transmission process before. The color parameters of the upper and lower halves were completely different. It was even possible that the upper half was black and white and the lower half was color. But if you think about it carefully, it seems that it can be used in tank fire control. The human brain's active rendering ability is super strong.

In response to Gao Zhendong's question about the two sensors combined into one, Engineer Lu responded very quickly.

"That's no problem, they've already done it."

That's fine, it's just an experiment after all.

But the line scan thermal imager also has a supporting device, which is made by the Institute of Directed Research, and that is the line array scanning system.

As a line scan that needs to output images continuously, it is impossible to control the line scan sensor to move back and forth, scanning from one end to the other.

This method either requires waiting for the scanning head to return to its original position before scanning the second frame, or requires processing and fusing the scanning data in two directions at the same time, both of which are unacceptable.

The most important thing is that line scan sensors are very expensive, and they also come with a lot of accessories such as refrigeration, parallel output lines, etc. If you drag this thing back and forth, then you can basically lose hope in the size, weight, reliability and usability of this thermal imager.

So actually, in the line scan thermal imager, what moves is the reflector in the optical system, which is much more convenient to move.

The line scan thermal imager that Gao Zhendong proposed from the system uses a rotating hexagonal prism reflection optical scanning system. It has a simple and lightweight structure and is relatively easy to manufacture and maintain. In mechanics, rotation is often easier to handle than reciprocating motion.

The supporting information for the thermal imager proposed in the system came with ready-made drawings, so Gao Zhendong did not go to look for units like the Northeast Institute of Optics. It was pointless to use an anti-aircraft gun to kill a mosquito.

On the contrary, the infrared air-to-air missile developed by the Institute of Missile Research has similar experience. The scanning of the orthogonal four-element detector is light cone scanning, which is also the reflection scanning of the rotating parts, but it is circular scanning instead of line scanning.

With this experience, it should be no problem to build an optical scanning system based on the existing drawings.

(End of this chapter)