PSN-L Email List Message
Subject: Re: Seismic Energy Source
From: Gordon Couger gcouger@..........
Date: Sat, 23 Jul 2005 20:28:26 -0500
When you put in the regular air freight part you eliminate any
explosives but on site generated oxygen and hydrogen.
When you set the cost limit at $2,000 you eliminate any drop
hammers or devices weighing at 500 to 1,000 pounds unless they
are extremely simple.
If you really want a device in that price range I think you
should reconsider using a 2 or 3 liter bottle with enough water
in it to discover a coating around a bit of calcium carbide and
generate C2H2 when it is dropped in the bottle after the bottles
is set in the ground and covered up to the cap by unskilled
labor. The Forman or Preston in charge loads the calcium carbide
pellet that is coated in something to keep it from generating
C2H2 for a few minutes and finish covering it up and wire it for
There needs to be a pressure sensor in the lid of the bottle to
let you know when it has enough C2H2 to give the desired results.
I think it can be done as safely but you can't ship calcium
carbide air freight. But it is a lot cheaper than you price range.
I don't think a kinetic device that put out and absorb the
energy of sledge hammer over and over can be made for $2,000
with out an explosive component. I have seen first hand what a
sledge hammer can do.
If you don't want explosives I think you may be suck with a
sledge hammer with a #2,000 cost limit.
Doug Crice wrote:
> Doug Crice http://www.geostuff.com
> Wireless Seismic http://www.wirelessSeismic.com
> 12996 Somerset Drive phone 1-530-274-4445
> Grass Valley, CA 95945 USA fax 1-530-274-4446
> I have greatly enjoyed this discourse on a better exploration
> source, and look forward to more ideas. To kind of remind
folks of the
> specifications, I would like to repeat and expand them.
> 1) A person ought to be able to carry it around (and be air
> regular air freight).
> 2) It needs reasonably high frequency output (ping instead of
> 3) Build it for $1000-$2000 (cost, not sales price) in lots
of 10 units,
> using commercially available and machined parts and normal
> 4) It should be safe, even when used by students
> 5) There should be no significant regulatory issues (a
> dynamite, the perfect source)
> 6) Operating supplies available in third world countries.
> 7) It needs to work better than a sledgehammer used with a
> can stack multiple impacts.
> 8) Because the source will probably be used in a repetitive
> needs a reasonably fast cycle time (many seconds, not many
> 9) The seismic signature should approximate a zero phase
wavelet, which as a
> practical matter; means the energy prior to impact should be
> 10) Good ground coupling is needed. In the case of a
sledgehammer, a metal
> plate is placed on the ground as a target. In the in-hole
shotgun, a hole is
> augured just big enough to hold the device below the soft
> preferably watered.
> The crossbow idea is equivalent to the "elastic wave
generator", powered by
> the large rubber band. Existing units weigh a couple of
hundred pounds, but
> it's got me thinking about a portable version.
> The variations on exploding bottles don't seem to meet the
> reasonably safe operation. Sure, a careful user would be
safe, but we are
> talking about students and third-world laborers.
> An earlier variation was the "vacuum assisted weight drop".
It had a 6 ft (2
> meter) long tube about 6 inches (15 cm) in diameter with a
100 pound steel
> bullet inside. The bullet was pushed up with air pressure,
> When the tube was full of vacuum, it was released and
accelerated by its
> weight and by atmospheric air pressure. At the bottom was a
100 pound anvil
> and plate combination pressed on the ground by the weight of
> mechanism. With equal weights for the piston and anvil, it
> (think of that ball bearing toy). The VAWD worked reasonably
> weighed 1000 pounds and cost over $10K 20 years ago. Using
air pressure as
> the accelerant provided a nice signature, since the force was
> the system, though when you released the piston, it instantly
> pounds of weight, providing the equivalent of a negative
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