Very far-fetched pre-project...

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Gary
Posts: 66
Joined: Wed Dec 05, 2001 1:01 am
Location: Modesto, CA
Contact:

Post by Gary » Fri Sep 15, 2006 12:54 pm

Sound is fairly useless in the audible range at least. For these purposes.

If I remember correctly, high frequency sound (in the audible range) is very directional, but can be stopped by a very light piece of material.

Low frequency sound (in the audible range) penetrates deeper and into heavier materials. This is why heavier walls, like brick or concrete, or special construction, are needed to get rid of heavy bass sounds, like rock and roll drums. On the other hand, these lower frequency sounds are less directional, and to some extent, go around corners etc.

I applaud anyone trying to look into the invisible however. There is so much we could learn by electronically looking into the earth, for purposes of archeology, mine detection, prospecting etc.

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Post by Chris Smith » Fri Sep 15, 2006 6:12 pm

They already have and use terra Hz scopes to look through walls.

These higher frequencies [not sound] go right through hard objects like cement walls and resolve object on the other side much like a starlight camera to make a real picture or image.

Much like the Hollywood SiFi flicks pretend, these devices have been around for more than 20 years.

Also they have and use 3D sonar for determining object behind walls.
[Interference]

Its much like Ultrasound in that there is no clear picture, but the object in question doesn’t need a face to tell the operators what’s happening.

VIRAND
Posts: 88
Joined: Tue Aug 23, 2005 1:01 am
Location: New York
Contact:

Post by VIRAND » Sat Sep 16, 2006 1:53 pm

Chris Smith wrote:Terra Hz usually sees through walls.
Which frequency sees through what depends on the material.

For example if a radio works inside something, it is on a frequency that goes thru those walls.

An Infrared TV remote uses TeraHz, but a cordless phone is around a GigaHz.
Which goes through walls better in your opinion?

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Post by Chris Smith » Sat Sep 16, 2006 8:49 pm

Radio waves go through most walls but don’t have the information necessary to decipher into a full video type screen display.

Ir remote’s don’t work anywhere near the THZ range cutting off very short as this is way past the giga Hz range and has soo many cycles quantitatively larger than a radio or general IR having hundreds of times if not thousands of time more saturation and information than most, leaving not only the penetration effects of these small waves but enough cycles to decipher it back into a actual resolution forming a picture.

Total IR goes from 100 ghz to 500 thz

Visible light goes from 500 thz to 900 thz but these waves are more concentrated like RF than a simple light source, making it better for the viewer on reflection.

These waves are concentrated in such a way to see past solid objects unlike most other RF and make a video into a resolution or picture as well.

Old attempts have been made and some have succeeded, as well as sound, but its all about the resolution of the screen, concentration and power levels.

All of the scopes I’ve seen are still in the early stages with most just being experimental.

VIRAND
Posts: 88
Joined: Tue Aug 23, 2005 1:01 am
Location: New York
Contact:

Post by VIRAND » Mon Sep 18, 2006 8:11 pm

Ir remote’s don’t work anywhere near the THZ range cutting off very short as this is way past the giga Hz range and has soo many cycles quantitatively larger than a radio or general IR having hundreds of times if not thousands of time more saturation and information than most, leaving not only the penetration effects of these small waves but enough cycles to decipher it back into a actual resolution forming a picture.

Total IR goes from 100 ghz to 500 thz
This statement contradicts itself i.e.
IR is nowhere near Thz (FALSE)
IR is from 100 GHz to 500 thz (seems to me nearly TRUE)

The simple and universal imaging device for all frequencies is a pinhole camera with a rectenna array. (diodes)
People really light up when they talk on their cell phones!
And everyone is noode at all these frequencies too! :cool:

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Post by Chris Smith » Tue Sep 19, 2006 9:24 am

Your IR transmitter is in a very narrow band of IR, not usable like the THZ transmitter in any way.

Yes, Ir and silk are transparent and even cotton to a degree.

Ir and cement bricks or wood are not.

The secrete of the THZ viewer is to find frequencies and power ranges that "go through" materials, not interfere naturally and cancel out the wave fronts.

Almost any frequency can penetrate a tiny distance of most materials, but then interference from the wave it self is canceled out.

Much like a bullet will dent a soft armor proof vest, some deep some shallow, while a sharp knife like object will slide effortlessly past a simple soft armor proof vest.

rshayes
Posts: 1286
Joined: Tue Mar 04, 2003 1:01 am
Contact:

Post by rshayes » Tue Sep 19, 2006 9:43 am

10 micron (Thermal IR) is about 30 Terahertz.
1 micron (Just below visible) is about 300 Terahertz.

Don't expect either of these to penetrate walls or soil.

Above 30 Gigahertz, absorbtion due to moisture will severely limit range and penetration.

Longer wavelengths may be usable, but are difficult to generate in short pulses.

VIRAND
Posts: 88
Joined: Tue Aug 23, 2005 1:01 am
Location: New York
Contact:

Post by VIRAND » Tue Sep 19, 2006 1:02 pm

Consider these effects...

Visible red light such as from a laser can be used like x-rays in pulses under the following
conditions when a camera shutter is open immediately after the pulse but then closed
before blurry photons scattered inside a body reaches the sensor.
We can all agree that red light travels through skin in a translucent manner
and imagine that the straight-line photons carry a good image.

Infrared can be used to detect indoor "weed gardens" because of the amount of
heat generated and slowly conducted through the walls which causes a useable
infrared image. 100'F or 37'C is typical body temperature which corresponds
to a wavelength of infrared, (in thz band) and can be "seen" through many kinds of
clothing as if someone was dunked in luminous paint.

As for increasing the resolution the phase of the wavefront contains far more
information than the wavelength of the illuminating pulse or carrier. An example
of that is that old phone lines cannot carry more than 3500 pulses per second
but yet it is still possible to send up to 56,000 bits per second using phase modulation
in a typical dial-up modem. That is, those 3500 pulses need not be periodic
and can be moved to many different points in time in between the peaks of
a 3500 hz tone. The result sounds noisy, I'm sure you've heard a modem.

The frequency of sonograms for prenatal images is optimum at 3500 Khz
inside the body. The imager (probably) focuses the echo onto an oily film surface,
transforming sound into a light-hologram... not a very good one IMO.
The speed of sound is somewhere around 1/4 kilometers or 1/5 mile per second in air
and around 1 unit per second in water, flesh is going to be different.
I estimate simple high resolution passive sonar in air be optimum at 400khz
in a pinhole camera using a condenser mic array. Anything that makes noise
lights up.

If you can not image using lightning, use the thunder. The wave front is
kind of playing the landscape like a groovy record and via slow sound,
the information comes slowly enough to analyze with primitive equipment.

Watch big brother watching you!
:shock: :!: :arrow: :idea: :cool:

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Post by Chris Smith » Tue Sep 19, 2006 2:33 pm

Your premises are in the right direction but incomplete.

Dope is sniffed not because of the weed, but rather the out gassing and often the color from certain plants, which makes the GAS [or color], not the actual plant detectable.

Quantitive wave lengths of the THZ signals don’t have to be single wave front.

Multiple over lapping waves, different frequencies, coherent waves, non coherent waves,.... all arrive at the same time all swamping the shore line [object] at the same time giving you penetration and resolution where normal resolution and strength are not available from a single mode.

Where a singe wave front hits and stops, reenforcement behind it can continue.

Much like a bullet half way through the job while the second one finishes it off.

THZ waves can be manipulate in ways common light of IR transmitter has never even been though of, combining the best of all the methods once never used.

Even sound can proceed a coherent light beam to reinforce the beam in ways never though of.

Coherent sound lasers are the new thing of tomorrow, and sound alone can change the properties of materials, as well as reinforced light.

Seeing through walls is not as simple as point a light and see everything behind the curtain.

A whole slew of techniques are used to get these waves to penetrate solid objects any way they can.

Post Reply

Who is online

Users browsing this forum: No registered users and 8 guests