'Robocop' gadget developed for police

[Ikhlaas]

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'Robocop' gadget developed for police

I'm not exactly knowledgeable on the subject, but is this not the same as them handheld security scanners they use in airports when the buckle in your shoe sets of the metal detectors?

Also,

The lightweight handheld unit uses high frequency microwaves to see through clothes and pick up "reflections" of concealed guns or knives from a distance of several metres.

I think I'm correct in thinking microwave ovens work by emitting microwaves at the resonant frequency of water. This causes the water to resonate and heats it up. Since the body is roughly 65% water, am I wrong in thinking this idea is fatally flawed?

[TVC_H4U]

Yeh, May give you cancer maybe... I see anouther flaw, which is a knife/gun disgise such as:

[Ikhlaas]

Lol.

I remember reading a couple of years back that there's a concern among those who use their mobile excessively. The mobile emits microwaves which heats up you brain. Extensive use could frazzle your brain!

I've just found this article from 1999 concerning the issue.

[Fishbone]

Microwave ovens do work by emitting microwaves at the resonant frequency of water, I'd assume they'd use a different frequency so they avoid cooking everyone they scan. There is a pretty large band of frequencies, 300MHz-300GHz, that are classed as microwaves. Just incase you're interested the resonant frequency of water is 2.45GHz, which is the frequency microwave ovens use.

A-Level physics has it's uses.

[RochdaleRed]

Fishbone is that what they are teaching now in A level Physics, how a microwave works lmao.
RR

[Ikhlaas]

Microwave ovens do work by emitting microwaves at the resonant frequency of water, I'd assume they'd use a different frequency so they avoid cooking everyone they scan. There is a pretty large band of frequencies, 300MHz-300GHz, that are classed as microwaves. Just incase you're interested the resonant frequency of water is 2.45GHz, which is the frequency microwave ovens use.

A-Level physics has it's uses.

From a bit of searching on wikipedia....

Resonant frequency of water = 2.45 GHz (As Fishbone said)
Microwave oven microwave frequency = 2.45 GHz (As you would expect)

Frequency of Wireless LAN/ Bluetooth = 2.40 GHz


Something to put worried minds at rest.

[Fishbone]

not exactly, you have to learn about waves etc. my teacher just threw in the microwave stuff because it's an everyday item that people are familiar with, plus it's also a good way to explain resonance.

[Ikhlaas]

Fishbone is that what they are teaching now in A level Physics, how a microwave works lmao.
RR

They do! It involves resonance which is important stuff!

It's better than what I had to learn at GCSE physics...
'Candidates are expected to understand and explain the moral and social implications of CCTV and streetlighting!'

Note: Not how the physics behind CCTV or streetlighting works!

[Fishbone]

From a bit of searching on wikipedia....

Resonant frequency of water = 2.45 GHz (As Fishbone said)
Microwave oven microwave frequency = 2.45 GHz (As you would expect)

Frequency of Wireless LAN/ Bluetooth = 2.40 GHz


Something to put worried minds at rest.

0.05GHz (50MHz) is quite a big difference, in fact it's a difference of 50 million oscillations per second, which is a lot.

[RochdaleRed]

Just remembered a story. I was travelling through a local airport and took my denim jacket off passed in on conveyor belt collected it other side and walked off. Only later when i was sat with my wife in departures had i remembered i had a knife in my top pocket which i use for fishing. I forgot it was there but they never picked me up on it. Scary

RR