Chapter 753 Slow Scan Camera
As soon as the leader's smile appeared, Gao Zhendong also spoke cheerfully.
"I have!"
What? ! Are you kidding me? I’ve never heard of us having this thing, and you suddenly have it? This kind of coincidence is really hard to believe.
"Really?" Some comrades couldn't help it.
"It's true! I can't say more specifics, but I can guarantee that this material can preserve photoelectrons for more than 20 seconds, and even for 1 hour if necessary."
This material was actually used in the camera tubes used by early meteorological satellites. In the era when CCD and CMOS photosensitive elements were not mature, this special camera tube was used to digitize images. The characteristics of this thing cannot capture videos, but Just fine for taking photos.
Slow scan camera tube, a special camera device used in early photography satellites and astronomical observations.
The principle is what Gao Zhendong said, which is to store photoelectrons on the target surface of the camera tube. This target surface is actually the photosensitive element, and then slowly read it out with the AD element. It is a strange element that goes in the opposite direction.
But don’t worry about whether it’s weird or not, just say whether it can be used.
20 seconds? At this time, it is indeed enough for the low-speed AD components to be read slowly one by one, and it is still plenty.
"Comrade Zhendong, are you sure you can do it?" Some comrades may have been frightened by the release of the fake satellite, but now that the real satellite has been released, they are afraid that Gao Zhendong will release the satellite without hesitation.
The leader of the National Defense Working Committee smiled: "Zhendong, tell me, be specific, it doesn't matter here."
But if you want me to tell you what, Gao Zhendong won’t be polite.
"Well, okay, let me introduce it in detail. I am engaged in materials..."
Are you not a computer person? This sentence came to everyone's mind.
But seeing that the leaders of the National Defense Working Committee didn't show any doubts at all, they realized that the young man working on computers in front of them didn't seem to be simple. Is he really a material guy? !
"... When working on certain optoelectronic materials, I have some intermediate by-products. Specifically, one of them is oxygen-doped antimony sulfide. After testing, its leakage current is extremely small, and the photoelectrons generated by the photoelectric effect remain for a very long time. Far beyond ordinary optoelectronic materials, such as Oxygen-doped antimony sulfide can be maintained for more than 20 seconds. This characteristic is unfavorable for my goal. Excessive photoelectron retention time will seriously reduce the imaging and detection performance, so I just recorded it, but did not study it in depth. "
These words confused everyone because they were too rich in information.
"Producing certain optoelectronic materials" means that he has successfully developed at least one new type of optoelectronic material.
"Some intermediate by-products", then when he was engaged in optoelectronic materials, there were many technical routes, which ordinary people could not do.
"One of them" means that he even has more than one high-resistivity optoelectronic material on hand.
"Without going deep", without going deep, how do you know you can even keep it going for more than 1 hour? It can only be said that his "in-depth" requirements may be higher than those of ordinary people.
Now the other comrades finally understood why the National Defense Working Committee invited him over temporarily. This young man really had the goods.
As for the National Defense Work Committee, after listening to Gao Zhendong's words, he was even more relieved, because Gao Zhendong was engaged in optoelectronic materials. This was a real thing. Although the final result was mercury cadmium telluride, during the preliminary tests, it was definitely Tried a lot of things.
After all, the earliest infrared photoelectric material we used was lead sulfide, so it was not surprising that he focused on antimony sulfide when he first started doing research.
The leader of the National Defense Work Committee even closed the loop on the research process of mercury cadmium telluride. Although he still couldn't figure out where Gao Zhendong got so much time, at least the process was completed in his mind.
Gao Zhendong had no idea that the leader had thought so much. He was now looking at the comrade who rushed to him with some confusion.
As soon as Gao Zhendong finished speaking, this comrade rushed over and held Gao Zhendong's hand: "Comrade Zhendong, I really need that material that can last for one hour. Astronomical observation is very useful."
It turns out that he is engaged in astronomy, so this is not surprising. It is completely normal to invite astronomers to study and discuss satellite matters.
Gao Zhendong was taken aback by him, and he was probably aware of this problem. The comrade explained: "There are many occasions in astronomical observations that require long exposures, or multiple exposures, such as deep space observations. Now we are suffering from no Digital similar exposure methods ”
Slow-scan camera tubes were originally used for astronomical observations, so this can be considered a return to their roots.
Gao Zhendong admires these comrades from all walks of life. They are very keen and can grasp the essence of new materials in the shortest possible time and find a suitable direction for their use.
This request is not difficult, and it is very easy for the third factory to meet it.
"Well, that's no problem. Send me a request later, and we'll customize a high-resistance photosensitive target for you."
When the comrade who was engaged in astronomy heard this, he happily sat back down, and the smile on his face never disappeared. He didn't expect that he could gain so much from holding a seminar, hehe. Looking at the scene in front of them, other comrades also laughed. Anyone would be excited to solve two scientific research problems on the spot, even if the problems may have nothing to do with his own work.
Some comrades engaged in radio and television communications have even calculated the transmission parameters.
"Hahaha, it doesn't take much. As long as there is a reliable holding time of 10 seconds, I can use the 31kHz signal bandwidth to transmit images of standard TV frame size at a frequency of 10 seconds/frame."
This signal bandwidth is different from the network bandwidth. They are two concepts. As for how low it is, simply put, it is 250 times lower than the TV signal.
Everyone else was in a commotion, and with this bandwidth, it was possible to jump up and do it.
No, I was worried about this and that just now, but now it’s even possible to take a picture every ten seconds? Although the TV picture size is a bit small, this speed at least means that it is no longer a dream to transmit a picture with a usable resolution in one minute?
No, no, many comrades feel that things are very unreal. Who am I, where am I, what meeting just happened, did I wake up?
"But it is difficult for the current C6108 to process pictures of this size? Even if the C6108 goes to the star, with the image compression algorithm mentioned by Comrade Gao Zhendong, it will not be able to process and compress such pictures very well."
Speaking of this, Gao Zhendong is not sleepy anymore. The C6108 is indeed almost boring, but the C6132 is not bad. According to its specifications, the speed of processing JPG images is acceptable.
"Don't worry about this, it's fine as a plan."
No one knows computers better than me—very reliable.
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The comrade who asked the question then remembered Gao Zhendong's other identity - the researcher of C6108. Comrade Gao Zhendong's identity is really annoying. He jumps around repeatedly and always makes people forget what he does.
With Gao Zhendong's words, everyone ignored this issue. In this regard, if Gao Zhendong said one, then others would not suspect the other. Although he did not explain it in detail, he understood everything.
"It seems that the conditions for taking camera satellites as the first choice for functional satellites are basically mature, and at least the prospects are bright." Some comrades made a concluding speech. Even if Gao Zhendong's words cannot be 100% believed, at least from the perspective of the route and prospects Say, there is nothing more reliable than this.
And this thing is really practical. Not to mention anything else, just as a weather satellite, it is tempting enough.
"Well, I agree with Comrade Gao Zhendong's suggestion."
"I agree."
"Me too."
"..."
Seeing that everyone had unanimous opinions, the leader of the National Defense Work Committee smiled and said: "Well, this matter, as the planning content of the payload on the satellite, is included in the overall planning plan for review. The third one is for test photography, and the second one is for test telemetry, Space environment, spaceborne power supply..."
Just as I said this, a comrade suddenly discovered that a question had been missed.
"Wait, leader, there is another question. Power supply! What to do with the power supply? What power supply will be tested on the second star?"
This sentence seems very abrupt, but it really reminds everyone of the power supply. If this is the case, then the third satellite must work continuously. How to adjust the power supply? In any case, the second star will have to test the power supply for the third star, but what power supply is used for the second one?
Gao Zhendong has never thought about this matter at all, power supply? Doesn’t that have solar panels?
But he soon realized that he had been spoiled by the photovoltaic industry in his previous life.
"Yes, you can't use batteries this way."
This sentence reminded Gao Zhendong that the reason why our first satellite was designed to have a lifespan of 20 days but actually worked for 28 days was because it had no solar cells at all. Our earliest space solar cells were originally developed in 1968. It was done, and it was not prepared for the first satellite, but for the second satellite.
In 1969, I discovered that I had chosen the wrong path, so I changed the technical route and started anew. Finally, I caught up with the second satellite to be launched into the sky. The effect was not bad and it was in orbit for 8 years.
Therefore, Gao Zhendong subconsciously felt that things that were logical and did not need to be mentioned were actually difficult at this time.
But there seems to be good news. He is not the only one who can prepare technology in advance.
"This is not a big problem. Some units have made solar cells using N-type substrates. The conversion efficiency is high. It can reach more than 7% in actual measurements. I believe that if it is further improved, it can reach about 10%."
This was the chief engineer of the National Defense Work Committee introducing the situation. In fact, he could only introduce it, because basically other comrades did not know about this matter. These solar cells were used in the desert.
It turns out that we have it, and everyone is relieved. As long as there is solar battery power, we can find a way to combine rechargeable batteries to ensure continuous power supply for satellites. The efficiency can even reach 10%, which can greatly reduce the weight of solar cells. Even Citigroup, Now it's only about 15%.
(End of chapter)