Chapter 1402: Explain me, what is surprise?
As the designer of the most important subsystem in an aircraft, Liu Yongquan had a little understanding of the overall design. In addition, he had been influenced by Chang Haonan for a long time and had deeply participated in several projects he cooperated with Dassault, so he is not unfamiliar with some basic concepts.
Looking at the infrared imaging image in front of him that was as dazzling as a small sun, he certainly knew that the other party's concerns made sense.
In this case, even a large piece of infrared bait will be difficult to catch the target of the missile.
But then again, infrared stealth is a major problem from the principle level.
Since infrared signals are actively emitted by the target and do not require electromagnetic echoes like radar signals, their essence is basically the same as visible light detection.
The difficulty of realization is comparable to optical stealth.
As long as the basic logic of the aircraft engine "acquiresponse force by injecting high-temperature and high-pressure gas backward" remains unchanged, it will be difficult to achieve the effect like radar stealth.
In fact, due to the continuous leap in power levels, the infrared signals of modern fighters are becoming more and more obvious.
On the other hand, infrared detection methods also have defects such as inability to measure ranging, and their application range in the air field is far less than that of radar.
In short, the attitudes of various countries in this regard basically highlight a Buddhist tradition -
The best thing to do, and just lie down if you can't do anything.
However, just as Liu Yongquan was about to say something, the countdown of the background system had already reached zero, and the prompt was to move to the next step.
He had to put the discussion on infrared characteristics aside for the time being and replaced Yang Wei to start commanding: "Start the tunable laser array and Mach-Zehnder interferometer to prepare to record the plasma distribution..."
The surface area of an aircraft is too huge, and it is impossible to use the invasive Langmuir probe directly as in Shengjing, but instead requires non-invasive measurement methods.
If it is a plasma in a nuclear fusion device, laser scattering will generally directly interact with the free electrons in the plasma, and the electron density and temperature will be directly measured through the scattering spectrum.
But the plasma energy generated by the aircraft engine on the surface of the aircraft is too low, and the error measured by Thomson scattering is higher than the electron density value itself, so we can only settle for the second best. Use a tunable laser to excite particles at specific energy levels, measure the relationship between fluorescence intensity and spatial position, and invert the electron density distribution in combination with interference fringes.
Although each scan is very slow, only a set of two-dimensional density distribution imaging can be obtained, but fortunately, the spatial resolution can reach the centimeter or even millimeter level and the trigger threshold is very low. A few more times can always give a very accurate result.
As the new command is sent to the front operating end, the robotic arm fixed to the ceiling is quickly lowered, and two bright green lines that are parallel and relatively moving are projected on the surface of the 2003 machine.
Wherever the light swept, the original lilac fluorescence immediately became rich and then gradually returned to its original state.
Like a layer of waves composed of fluorescent light that constantly advances from both sides to the middle.
Take this effort, Liu Yongquan continued the original topic again:
"I think the problem of infrared signals will not be very big... at least it will not be very big at this stage."
After feeling the other party's skeptical eyes, he further explained:
"When I helped Snekema improve the M88-3 and M88-4 engines, I came into contact with a large release bait in France that needs to be installed in the wingtip pod. It not only simulates the temperature of the fighter's tail nozzle, but also restores the complete fuselage signal to a certain extent. It also glides for a period of time after being launched, instead of falling freely. Dassault is planning to use this thing to deceive multi-component infrared seekers and even infrared imaging seekers..."
Yang Wei seemed to understand what he meant:
"You mean, even if the infrared characteristics are more obvious, you can use new models. The bait deceived the incoming weapons to a certain extent? "
However, Liu Yongquan shook his head decisively; "No... In fact, according to the test results of the French Air Force, even the Rafale F2 fighter with the infrared signal characteristics is not particularly obvious, it is difficult to use this bait to deceive the latest generation of infrared guided weapons... So I want to say that some differences in infrared signal characteristics should not be particularly obvious in actual combat. In contrast, by stealth ability, speed and maneuverability, it is reasonable to win. "
Yang Wei took off his work hat and rubbed his hair that was a little scattered because he had not taken care of for several days: "I understand what you said. Currently, the only ones that are Mika and R27T with a large number of equipment are Mika and R27T, which are not the main threat, but Party A made relevant requests at the beginning..."
In fact, in addition to the requirements of the aviation force, he himself also hopes that the fourth-generation fighter jet born from himself can be as close to perfect as possible -
Due to the particularity of the No. 10 Project, Yang Wei has been in charge of work as the deputy chief designer for a long time.
If nothing unexpected happens, when the fourth-generation fighter jet in front of him is completed, he will almost be at the age of leaving the front-line position and entering the management of the Aviation Industry Group.
In other words, this is most likely the finale of my career. However, Liu Yongquan did not realize this layer, and just replied: "Besides, the plasma generator is an accessory that can be selected by the pilot to choose whether to start. It is not a necessary equipment to maintain normal flight..."
"From the perspective of written specifications, it belongs to the same category as the bomb bay and the speed reduction plate. It will not be allowed to turn on when the indicators are approved during the acceptance process. From a practical perspective, currently infrared guidance is basically weapons within the range of sight. Even the range of Mika and R27T is terrible. Anyway, radar stealth is not required during the fighting process. Just turn it off before connecting to the enemy within the range of sight..."
"..."
"..."
Yang Wei took a deep breath and wanted to refute something, but he had to admit that what the other party said seemed to make some sense...
But if this matter was not resolved, it would be like a perfectionist being stuck in his throat.
I dare not say it for the rest of my life, at least I can't sleep well for the next year.
"Hu——"
Yang Wei shook his head, and did not directly give a positive or negative answer, but just raised his chin to the test station outside the glass:
"Let's not mention these for now, wait and see the data."
Liu Yongquan also noticed some abnormalities from the other party at this moment, but it was hard to say anything else, so he had to turn his gaze back to the verification machine with fluorescent all over his body.
The most new ⊥小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小小�
For a moment, the atmosphere in the whole room became a little subtle.
About twenty minutes later, the first set of data directly above the plane was finally inverted and entered into the system.
The data analyst had already felt the low pressure between the two big guys, but he could only whine his teeth and shouted: "Report, the result has been uploaded to the server terminal!"
This sentence was like turning on a switch, allowing Liu Yongquan and Yang Wei to take steps almost at the same time and come to the console.
From a qualitative perspective, only one-way control can be performed, and the plasma sheath distributed on the surface of the body in a semi-free form must be instable enough.
The result presented on the two-dimensional diagram is like intertwined, which is dazzling for a moment.
But it can still be seen that the overall trend of gradually weakening of electron density and infrared radiation intensity from behind to front.
It is basically consistent with the phenomenon observed before -
Except for an extremely subtle detail.
"Wait a minute."
Yang Wei's originally solemn expression instantly turned from Yin to Qing, pointing to a position on the curve close to the tail nozzle of the plane.
The corresponding electron density there is no different from other locations, but infrared radiation obviously shows abnormal depressions.
Even close to the value in the middle of the plane.
Although I don't know the specific principle, it is obvious that some kind of occlusion processing of infrared signals has been carried out.
The reason why I didn't see it on the infrared imaging diagram just now is probably because the spatial scale of this place is too small, about 10 cm, so it is blocked by the surrounding ultra-high-intensity infrared signals.
The results of excitation fluorescence inversion will not be subject to normal optical interference, and the real situation is still faithfully recorded.
"Old Liu, you can."
Yang Wei turned around and patted Liu Yongquan's shoulder heavily:
"This place probably corresponds to the transition from the engine outer box to the tail nozzle, which has been laid for so long just now. I am going to give me the whole surprise, right?"
However, Liu Yongquan was as confused as he was at this moment:
"I'm not, I don't..."
(This chapter ends)