Defence Research and Development Organisation (DRDO) : News and Updates

Gautam said:
None taken. I wasn't commenting on how HPMs work(I don't know really) but what effect it has. My understanding of effects of microwave, however flawed it maybe, was from open source articles about the side effects of microwave exposure on metallic object and electronics.

Effects on electronics exposed to high-power microwaves on the basis of a relativistic backward-wave oscillator operating on the X-band : (Not S-band, I know. But close enough)
https://www.tandfonline.com/doi/abs/10.1080/09205071.2017.1354728

From the paper :
"The effects on electronic devices exposed to HPMs, the failure of information equipment, and modulation of and interference with the received signal through a theoretical model of the threshold power relative to the influence on the target were confirmed in a high-output microwave exposure environment. Particularly, information devices containing semiconductors can undergo serious failures and breakdowns due to the thermal secondary breakdown caused by the high-output transient electromagnetic waves, and it is a theoretical consideration that reverse voltage occurs due to the generation of surge current when caught in the PN-junction region."

What happens if you put metals in Microwave : (as in the cooking device, not weapons)
What’s Up With That: Metal in the Microwave Explodes—Or Does It?

From the paper :
"Well, at a microscopic level most metals are lattice arrangements of atoms with a bunch of electrons freely floating around between them. The microwave radiation will attract all these electrons as it bounces around inside your microwave oven, pulling them back and forth, and this generates heat inside the metal. A large sheet of very thin metal, like a big piece of aluminum foil, can in fact heat up extremely rapidly, becoming so hot that it could start to burn the microwave. So don’t do that.

But the real danger comes from having metal with kinks or dead ends in it. That’s because as the electrons get shuffled back and forth, they will meet up with other electrons. This can create concentrated spots of negative charge. Electrons will naturally be repelled from areas where there is too much charge. If these negative spots happen to find themselves in a place where they are near air, like in the tines of a fork or a kink in crumpled aluminum foil, the electrons will jump away, creating a spark and ionizing the air molecules into a plasma. Particularly awesome high-school physics teachers will demonstrate this effect to a classroom by placing a CD in the microwave and watching the sparks fly. The sparks themselves probably won't start a fire but if they hit something flammable, like wax paper that you also put inside the microwave, it can lead to a situation where you’re running for the extinguisher."

Now I fully understand if the effects of a S-band HPM is different then the ones mentioned here. But since I don't know anything of the specs of the weapon, all I could do was speculate using open source information.

But if you could enlighten me about the effects and possible uses of the HPM here. I'd be delighted.

I never said it was extra ordinary. I only said it was already in use.
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hellbent said:
If you want more info feel free to ask porky_kicker in his usual place,
I will be more than happy to answer your queries Gautam sarkar.

Bye
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Chill out Guys DEWs arent understood by majority of People. Let alone the sheer variety and environments where they are deployed, plus energy requirements and modes of operation. I think I'll Make a thread on it by end of this week.
 
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Old pic..........

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vingensys said:
After a trial of fire for long and being subjected to repeated tests to meet specific requirements that has been handed down only to this product, its heartening to see this missile coming of with flying colours... been folloing NAG for quite a long. Have seen many a false starts. Hope this time its different
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Anyone has the updated pic of the NAMICA?
 
DRDO and IIT-Madras are studying the use to composite tubes in making aircraft landing gear. Use of composites will significantly reduce the weight of the landing gear, if you recall the landing gear weight has been an issue for both Tejas and Rustom drones.

To this end the problem with composite landing gear is the tendency of buckling under load. To solve the problem DRDO and IIT-M are trying various combinations of materials and various winding patterns to make composites to see if any can actually hold its own under application of large pressure.

The results are starting to look pretty promising.

View of Effect of Helical Winding Angle on External Pressure based Buckling of Partially Filled Thin Composite Cylindrical Shells
 
I've a question guys. Do all submarines have CO2 absorbers ? I mean they should, right ?

Anyway, here is a schematic of CO2 absorber used by IN submarine(s). No idea which one(s). I was thinking, since all our subs are imported or license made, shouldn't all of them have CO2 absorbers of their own ? So why are we making CO2 absorbers ? Maybe for INS Arihant, maybe for other subs undergoing refitting.
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