Chapter 457 A world of difference
After spending some time arranging all matters related to the 6011 campaign and starting them all, Gao Zhendong decided to visit Factory 1274 and ask the th Ministry of Machine Building to inquire about the supporting conditions of some lithography machines.

Gao Zhendong walked outside the office building and greeted his colleagues from all levels.

"Hello, Mr. Gao..."

"Hello, Director Gao..."

"Lao Gao, are you going out?"

People who greet him use all kinds of names, and people who follow him at different times have different customary names for him.

It was not until I arrived outside the office building that I heard a rare sound.

"Hello, Director Gao."

Who the hell is this? It's rare to hear someone call me that, but the voice is familiar.

Gao Zhendong looked up and saw that it was Liu Haizhong.

He was with two comrades from the Security Department, both wearing red armbands, probably on patrol.

Liu Haizhong's identity was changed, but he still had no position. Every job has its own position, and it was impossible to vacate or create a position for him, so for the time being, he was still responsible for patrolling with two young comrades.

Gao Zhendong nodded, said hello, got in the car, and rushed to Factory 1274.

In the car, he turned to Xie Jianye who was going out with him and said, "Old Xie, keep an eye on this man. Don't let him enter the third factory."

Our comrade Xie Jianye is now the official section chief of the Internal Security Section 5 of the Security Department.

Hearing Gao Zhendong's words, his eyes flashed and he nodded in agreement. Although he didn't know why Gao Zhendong said this, it was always right to listen to him.

When he arrived at Factory 1274, he went straight to the workshop where Fang Yinghong was.

Fang Yinghong is here to support them in transforming the diffusion furnace, so where she is must be the location of integrated circuit process research.

I rushed all the way there and got stopped by the guard outside the workshop.

Gao Zhendong and Xie Jianye showed their work IDs. After the other party verified them, he smiled and said, "So you are Chief Engineer Gao from the Third Rolling Mill. Our factory director and chief engineer often mention you, and so does your comrade Fang Yinghong here. I am the deputy director of the Security Department of Factory 1274. My last name is Tang, and I happen to be on duty here today."

It seems that 1274 attaches great importance to this matter. The deputy director of the Security Department has been sent to the process workshop to guard the gate.

Although the duty is rotated, the fact that it was rotated to the deputy director shows that the standards here are very high. Maybe it is not the requirement of the factory but the deputy director’s own initiative. But that is more telling.

"Hello, Director Tang. We came here today to check out the progress of the process research and to express our regards to the comrades working here on behalf of our factory. Haha."

Director Tang was very talkative: "You came at the right time today. As it happens, there are quite a few people here today. Comrades from other units are also here. I heard that they were recommended by you. Our Chief Engineer Lu is also here."

Gao Zhendong was surprised. He even recommended someone himself? He would take a closer look.

Several people walked in while chatting and laughing.

When we walked into the workshop, we saw a busy scene. A group of people, including Mr. Lu and Fang Yinghong, were gathered together looking at something.

Director Tang walked up to Mr. Lu and said, "Mr. Lu, Mr. Gao from the Third Rolling Mill is here."

A group of people put down the materials in their hands and turned around with surprise.

"Mr. Gao, what brings you here? Did you know we have an experiment here today?" Mr. Lu said with a smile.

Gao Zhendong glanced over and saw several people who turned around who he had not expected to be here.

Lu Gong from the Institute of Advanced Studies, and his classmate Lin Lianwei.

Gao Zhendong knew that they were in charge of the guidance subsystem of the infrared air-to-air missile. It seemed that they came here because when he was instructing them to modify the guidance head of the Thunder-1, he mentioned that if there were any problems in the production of the infrared photodiode, they could ask Factory 1274 for help.

It seems that they are busy with this matter. No wonder Director Tang said that there are people recommended by himself in the workshop.

He quickly greeted them, and then said to Mr. Lu, "No, I just happened to be free today, so I came to see how the process research is going. I also came to visit Fang Jie and the others as a family member. I didn't expect that it would be better to come at the right time than to come early, and I just happened to run into you. What are you busy with?"

President Lu smiled and said, "President Lu and his team want to make a batch of diodes, and the process requirements are slightly special. It just so happens that the transformation of the diffusion furnace has reached a certain stage, so we will use this new furnace to trial-produce a batch for them."

President Lu also smiled and said, "President Gao, I really have to thank you for pointing the way. Otherwise, we really couldn't find a manufacturer that meets our process requirements for a while. This time they built this new diffusion furnace, and the range of process control just covers our needs."

He was called Mr. Gao, which was from the perspective of Gao Zhendong being the deputy chief designer of the Raiden-1 modification. Gao Zhendong did not expect this unexpected surprise, and he was very happy. He had just mentioned it casually but did not expect it to be useful. He did not expect to get this reward.

"That's great, how is it going now?"

President Lu smiled and said, "We have developed the infrared photodiode, and the preliminary results seem pretty good, but the most important sensitivity is still being tested, and that will take a long time, but the results should be out soon."

This is a single infrared photodiode, not something like a focal plane array, so parameters such as blind element rate do not exist, and there is no need to use technologies such as photolithography. Just use a suitable diffusion process to diffuse the specified elements to one side of the mercury cadmium telluride crystal, and then lead out the package.

"What is the consistency of the crystal composition?" Gao Zhendong asked casually.

"Very good. The composition unevenness of the main control elements is below 1%, which is sufficient for use." Engineer Lu said with a smile.

Neither of them said what kind of crystal it was specifically. This is something that needs attention. For 1274, the mercury cadmium telluride infrared photodiode is a supplied material for processing, and it only needs to be processed according to the process requirements proposed by the Research Institute. They don't know what the specific original material is, and they cannot inquire about it.

Gao Zhendong nodded: "That's good. Did you even bring your sensitivity testing equipment?"

The equipment at Factory 1274 itself cannot support this kind of professional testing, so it is usually sent back to the Research Institute for testing. But seeing them all gathered here, it seems like they can test it on-site.

President Lu smiled and said, "The comrades from the Institute of Guidance and Research have a high demand for time, so they brought their equipment and testers here. We have specially allocated an area in the workshop for them over there."

Engineer Lu also echoed: "Yes, I also want to thank the comrades of Factory 1274 for their great help and the various conditions they provided."

Gao Zhendong laughed out loud. He was very proud that the several projects he led could produce such a fantastic linkage.

"Then let's wait for the results. This is like killing rabbits by robbing haystacks. We have tested two subjects at once."

Everyone laughed together, discussing technical issues while waiting for the test results.

The reason why the sensitivity test is slow is that the sensitivity of most infrared photoelectric sensors is different under different ambient temperatures. The lower the temperature, the higher the sensitivity. This is why good infrared equipment generally uses refrigeration.

Therefore, in order to master this characteristic curve, its sensitivity needs to be tested at different temperatures.

At the same time, in order to verify the repeatability of the process, it is necessary to test the performance of multiple batches of multiple diodes, which takes even longer.

Gao Zhendong arrived at Factory 2 at around 1274:4 p.m. Even though they had already conducted some tests in the morning, Gao Zhendong did not receive the experimental results until around : p.m., almost : p.m.

Lin Lianwei rushed over with the data. At this time, only Gao Zhendong and General Manager Lu were present. Even General Manager Lu from Factory 1274 had retreated far away from the workshop with his men. They only had to wait for the qualitative judgment of the results and could not listen to the quantitative data.

"Mr. Lu, Lao Gao, the data is very good! So sensitive!!!"

Mr. Lu was delighted: "Quick, show me!"

After taking the analysis results, we can see a very beautiful curve. At a temperature of 140K, it rises slowly to 170K, and then the rise increases sharply to 200K.

“太好了！平均下来，140k的噪声等效温差15mk！180k时为19mk，200k时仍然保持在30.5mk！太好了！”

As for the temperature below 140K, they don't have such good refrigeration equipment and can't measure it, but this is enough. This data is much better than the lead sulfide refrigeration they have now. It is not a matter of slight improvement, but a world of difference.

If the noise equivalent temperature difference is maintained at 200mK at 30.5K, then theoretically this infrared photodiode can distinguish a temperature difference of 73 degrees Celsius at an operating temperature of minus 0.03 degrees.

As for 10 degrees or 20 degrees, that is very easy. An object that is 20 degrees Celsius higher than the background will be as bright as the sun in the eyes of a mercury cadmium telluride detector.

This temperature, or a higher temperature, can be easily achieved by missile-borne refrigeration equipment. For the Institute of Radiation Research, it can be said that it has solved the ultimate problem of all their infrared detection equipment at one stroke - the sensor.

Gao Zhendong was relieved. He knew that the performance of this detector was worse than that of the mercury cadmium telluride detector he had seen in his previous life. This was normal. What was the technical environment at that time? He was already very impressed with himself for being able to make this thing with what he had in his hands.

And although there is a slight difference, it is not too much, and the actual performance improvement is huge.

The new generation of technology is so powerful.

"Mr. Gao, the material you made is really amazing! I never dared to imagine the degree of improvement!" Engineer Lu looked at Gao Zhendong, extremely excited.

He could guess that since Gao Zhendong was so confident in this new material, there must be improvements, but he really didn't dare to imagine such a huge improvement.

"How's the consistency?" Gao Zhendong didn't open the champagne at halftime.

Lin Lianwei looked at the data analysis results and said, "Very good. The data deviations between different batches and different crystals are very small. If they are made from the same crystal, the deviations will be even smaller."

(End of this chapter)