Chapter 1404 Selective Absorbing Metamaterials


    Institute 606 does not have the ability to develop aviation materials, so just like other general institutes responsible for system design, it will propose a series of key indicators based on model needs, and then assign or bid for a unit to undertake the development work.


    And just like other Party B, although the latter will attach a test report to the materials, it is just a task to complete after all, and the content in the report is obviously impossible to really cover everything.


    Generally speaking, it will only include various conventional attributes and relevant indicators proposed by Party A in the development requirements.


    Since the initial design of the turbofan 10G, we did not consider using this part of the coating to shield the infrared signal, in the subsequent acceptance stage, we only examined the thermal insulation performance and overall infrared emission characteristics of the new material according to convention.


    To some extent, these two indicators are actually the same thing.


    As for the results, although they are indeed slightly different from the old version, they are still on the same order of magnitude.


    Moreover, the test process just now has proved that the macro temperature shown by the engine is not much different from Liu Yongquan''s prediction, which means that it is not that something went wrong with the previous test process.


    It is simply that this material exhibits a certain nature that has not been noticed before.


    Liu Yongquan quickly followed Yang Wei to the confidential office of Factory 132 and contacted Researcher Peng Wenzhi, who was responsible for the development of new coatings at the Materials Research Institute.


    "Old Peng, it''s me, Liu Yongquan."


    After the phone was connected, he directly reported to his home and then opened it straight to the point:


    "There are some problems with the infrared emission characteristics of the HDK305 coating..."


    Although the test of the No. 2003 aircraft began early in the morning, everyone had been struggling in the workshop for several rounds. In addition, due to life and reliability considerations, it was impossible for the aircraft engine to start and stop too frequently, so it was actually time when the sun was about to set.


    Peng Wenzhi on the other side was about to get off work now, but suddenly he received a call from a party saying that there was something wrong with his product. In an instant, his blood pressure almost exploded. He asked quickly:


    "What''s the problem?"


    Liu Yongquan hesitated for a moment:


    "It''s not clear yet, but the result is that the thermal signal intensity is particularly low, which is about half to about one quarter of the calculated value, and it is not stable at a certain ratio, but like a gate..."


    “…”


    It took him about a few minutes to tell him what he had encountered on the previous day.


    Peng Wenzhi felt confused after listening:


    "How is that possible?"


    He quickly returned to the front of the computer, and after pressing the screen, he quickly found the test report:


    "Didn''t you test the optical and thermodynamic properties during the previous acceptance? If you really want to say, the thermal conductivity is several percentage points higher than the previous generation of products?"


    Speaking of this, I suddenly paused:


    "Wait, what you just said was not the temperature...so you have specifically measured the reflection... or absorption spectrum?"


    There was a little unhappiness in his tone.


    Logically speaking, if Party A wants the material to have certain optical characteristics, then it is enough to directly explain it in the task requirements.


    Even if you want to ensure that everything is foolproof, you can directly state it in the contract that a third party jointly recognized by both sides can issue a test report.


    Those who are silently looking for someone to test are generally manifestations of extreme distrust of Party B.


    It’s okay if you don’t trust it, but you still call it out?


    Everyone looks down in the same system, how can they work together in the future?


    However, Liu Yongquan''s mind was full of curiosity at this moment, and he did not pay attention to the subtle changes in the other party''s tone:


    "It''s not the spectra that was measured... I''m now in the 132 factory, using infrared imaging systems and stimulated interference to observe."


    Peng Wenzhi was stunned again, and immediately realized that it was a mistake during the communication process, so he turned his attention back to the abnormal situation mentioned by the other party.


    "Infrared imaging and stimulated interference are not strictly used as solid material detection methods. If you really want to obtain detailed infrared light characteristics, you still need to use the spectrum..."


    He spent his first half of his life working in the laboratory and was helpless about the wonderful ideas he occasionally made.


    But Liu Yongquan''s response also highlights a sense of confidence:


    "Even if the stimulated interference spectrum cannot keep up with the spectrum in terms of accuracy, it is impossible to have such a large error, right?"


    This sentence is reasonable and well-founded, which made Peng Wenzhi lose his paralysis for a moment.


    But it also gave him new inspiration:


    "Old Liu, when you are taking the measurement, is the target being tested exposed to an atmospheric environment?"


    Liu Yongquan was a little helpless:


    "We are testing a whole aircraft, and we can''t put it in a vacuum tank... the cost is too outrageous, and it doesn''t fit the actual working environment." "That''s right... there is indeed a theoretical possibility."


    Peng Wenzhi explained:


    "The atmospheric window bands of infrared detection are 3-5 microns and 8-14 microns. The other parts are easily absorbed by carbon dioxide and water vapor. Therefore, if one material accurately has a high absorption rate in these two window bands, or one of them has a high absorption rate and all other bands have a high transmittance, then it can achieve both low infrared signals and high heat dissipation capabilities at the macroscopic level, and our previous infrared emission characteristic test without frequency bands cannot find this..."


    At first, he still seemed to have a sudden realization.


    However, when it comes to the end, I am a little skeptical:


    "But the material with this characteristic is really ideal. In the past, we usually only dared to write some relevant content on the "Future Work Outlook" section at the end of the paper, otherwise it would be easy to be considered a bragging..."


    "Our hospital shouldn''t be that powerful... right?"


    Liu Yongquan was overjoyed at this time, so he didn''t care about these things:


    "As you say, just cover this coating on the entire surface of the object, can the target completely disappear in the field of view of the infrared imaging system?"


    As he said that, he subconsciously looked at Yang Wei who was waiting for the results of communication.


    And the latter''s eyes were also shining at this time.


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    If the dual stealth of infrared and radar signals can be achieved, then Project No. 20 will be no regrets for him.


    However, Peng Wenzhi is not as optimistic as the two of them:


    "This is indeed the case in principle... But first of all, the mechanical properties and coating properties of this material are average, and it requires a lot of additives to adhere to the surface of metal or composite materials. It is okay to use less now. If you really want to cover the entire aircraft, the cost and weight may be a problem."


    "Of course there is always a way to overcome this point. More importantly, we''d better first determine that this characteristic is not an isolated case..."


    Liu Yongquan frowned with difficulty:


    "When chemical composition is determined, can the material properties be an example?"


    Peng Wenzhi immediately laughed:


    "It''s hard to say... Although materials science has made great progress in many aspects, it is essentially a more efficient alchemy unless..."


    His words came to an abrupt end here.


    "Unless what?"


    Liu Yongquan couldn''t help asking.


    “Unless the macroscopic properties of the material can be predicted to some extent based on the microscopic particle arrangement.”


    This time, Peng Wenzhi''s tone was already full of seriousness:


    "So I''m going to contact Torch Laboratory. Academician Chang and others may be able to do it..."


    Hearing Chang Haonan''s name, Liu Yongquan suddenly felt like he was "passing around and then returning to the origin."


    He smiled bitterly and shook his head, then looked at the calendar on the table next to him.


    January 16, 2009.


    "Mr. Chang is not in the capital now."


    According to the plan, the "Xuanniao" hypersonic vehicle will conduct the fourth and fifth consecutive flight tests. At the same time, the "Thousand-Minute Sky Survey" radar network proposed by Chang Haonan has also been deployed, and will take this opportunity to verify its monitoring and early warning capabilities for hypersonic targets in adjacent space.


    Of course, these details must not be explained too clearly to Peng Wenzhi on the other side.


    "No more than that..."


    Peng Wenzhi''s speech speed is fast:


    “If this artificially designed metamaterial can come true, it can be disruptive for the entire material science…”


    (End of this chapter)