J-10 Thread III (Closed to posting)

[crobato]

Two beams of flashlight don't make the experiment. White light consists of a myriad of spectral frequencies all mixed together to create the appearance of white. All these frequencies are being emitted in all sorts of random phases. Cancellation is impossible. For light to cancel, you would need to use lasers.

Here is an example of constructive and destructive interference on light, and its applications.

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[oringo]

Two beams of flashlight don't make the experiment. White light consists of a myriad of spectral frequencies all mixed together to create the appearance of white. All these frequencies are being emitted in all sorts of random phases. Cancellation is impossible. For light to cancel, you would need to use lasers.

Here is an example of constructive and destructive interference on light, and its applications.

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The point I'm trying to make is that interference of radio and EM waves does not cause energy transfer to heat like you described. Is it so hard to admit you were wrong?

 

[crobato]

The point I'm trying to make is that interference of radio and EM waves does not cause energy transfer to heat like you described. Is it so hard to admit you were wrong?

To be honest I don't really know. A lot of people are asking what truly happens to canceled radar waves and there appears to be no straight answer, other than dealing with quantum physics. There has to be some form of energy conversion that has to happen, likely somewhere along the EMF spectrum. Perhaps its not heat but somewhere along the radio spectrum also.

 

[challenge]

are you refering to radar cancellation technique?or RAM material/
I recalled a back issue of Miltech,reported that some RAM material and plasma convert RF signal into heat.
Radar cancellation technique remain highly confidential topic.during the bombing of serbia air defence,NBC news claim B-2 bomber carry new ECM technique to cancel out RF.it is possible that Israel F-16 may also use same technology to bomb syrian nuclear reactor near the turkish border.

 

[crobato]

are you refering to radar cancellation technique?or RAM material/
I recalled a back issue of Miltech,reported that some RAM material and plasma convert RF signal into heat.
Radar cancellation technique remain highly confidential topic.during the bombing of serbia air defence,NBC news claim B-2 bomber carry new ECM technique to cancel out RF.it is possible that Israel F-16 may also use same technology to bomb syrian nuclear reactor near the turkish border.

You can find radar cancellation technique in the Internet, or even in Wiki.

You can also find radio wave cancellation even in microwave ovens. Its not hard to explain how. In fact I already explained how radar cancellation works with the explanations above. The trick is to get the second wave be a clone of the first wave and time it to be completely out of phase. Meaning what is the peak or the crest of the first wave is the complete opposite on the second wave, being the trough or valley. The concept with structural RAM is that the second wave is not an emission but a reflection; you want to make a second reflection out of phase with the first reflection. If its an emission the topic moves to ECW.

Many RAM coatings are ferric, which is fancy word for iron fillings. If radio waves strike a magnetic material, they are absorbed and converted to heat. That's why effective antennas have to made with an iron material. If you notice why slotted arrays have this orange color, that's the color of iron oxide, or rust.

 

[williamhou]

Agree. Only in the infra-red region (and thereabout) does EM wave generate the kind of heat that we normally deal with. And, to make things clear, that only happens when the waves interact with another medium other than themselves. The waves' construction or destruction pattern does not by itself generate heat.

correct

 

[williamhou]

To be honest I don't really know. A lot of people are asking what truly happens to canceled radar waves and there appears to be no straight answer, other than dealing with quantum physics. There has to be some form of energy conversion that has to happen, likely somewhere along the EMF spectrum. Perhaps its not heat but somewhere along the radio spectrum also.

No need of quantum physics here, it's just Electromagnetism, 2 wave become 1 wave and the wave still carry the energy

 

[williamhou]

The point I'm trying to make is that interference of radio and EM waves does not cause energy transfer to heat like you described. Is it so hard to admit you were wrong?

correct

 

[Quickie]

Don't want to really drag on this discussion but, actually, using the words "cancellation" or "destructive" can be confusing since the energy states of the individual wave components remain the same during the interference whether it be destructive or constructive. This shouldn't be confused with the dissipation of EM wave energy as it interact with a medium, like for example the atmosphere or even a solid object.

No energy is actually lost during an EM waves' destructive interference as the same wave components would, in another instant of time, be involved in a constructive interference.

I think I have enough of this discussion even if I can't get the point across.

 

[challenge]

according to a chinese web site, adapting DSI inlet reduced the overall weight by 300 kg.
Although F-16 first tested flight with DSI inlet way back in 1995,is there any reason why it never adapted by USAF?