Written by the TreasureGuide for the exclusive use of the Treasure Beaches Report.
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| Still Clip from American Valor: One Marine's Story Showing Joey Jones with Metal Detector in Afganistan. Source: American Valor: One Marine's Story |
I'm not sure what the metal detector is, but notice the Big Foot style elongated rectangular coil. In one quick view I thought it was a Garrett, but I don't know. Anyone know?
You might know the story. Joey later had his legs blown off and nearly died. You can view the story.
American Valor: One Marine's StoryI recently mentioned some of the changes I thought you might see in metal detectors of the future. I found some research on the changes I thought could be coming. One of the things I predicted was the integration of various forms of detecting such as thermal, and GPR to supplement current metal detector technology. Here are a few excerpts I just found in one report to add to that.
The most mature sensors for mine and IED detection include metal-detector coils, infrared (IR) cameras, and ground-penetrating radars (GPR). Depending on the type and depth of the target, each of these systems has advantages and limitations.
• Metal detectors can detect targets deeper than a GPR but cannot reliably detect low-metal targets.
• GPRs can detect metal and low-metal targets, but do not perform as well against deeply buried targets.
• IR cameras can provide contrast between targets and the surrounding soil, but are ineffective during thermal crossover points (dawn and dusk)...
... ROC curves show the trade-off between probability of detection (PD ) and false-alarm rate (FAR)....
As sensitivity is increased, systems usually have an increase in false alarms. You therefore need to make a strategic decision of how sensitive you want to go considering the likely increase in false positives. For most detectorists that means turning sensitivity or discrimination up or down.Here are a few excerpts from another article on research to develop more effective detecting technologies. This research is also concerned with military contexts but the developments apply equally well to the detection of buried treasures.
Here is the first excerpt.
Current state-of-the-art electromagnetic induction (EMI) metal detectors can detect small metal objects at shallow depths and large metal objects at greater depths under a wide range of environmental and soil conditions. However, nonlethal metal (clutter) objects commonly found in the environment are a major issue. Because these clutter objects represent false targets, they create a false alarm when detected by a conventional metal detector. Ideally, the detected metal targets should be classified as to their threat potential: landmine/UXO, weapon, or clutter. This article describes several current research projects at APL that focus on solving this metal target detection and classification problem...
[UXO = Unexploded Explosive Ordnance]It has been estimated that for every real land mine detected there are as many as 100 to 1000 metal clutter objects detected. Obviously, it is desirable to be able to discriminate the metal clutter from the real landmine...
Most EMI sensors designed for UXO detection and discrimination do not take advantage of the available information that is inherent in the metal target’s elec tromagnetic response to an external magnetic fi eld excitation. Rather, these sensors tend to measure only a single dimension of a target’s response or, in the case of a spatially scanned metal target, try to infer a multi dimensional response. Some experimental EMI sensors that do attempt to generate a three-dimensional (3D) magnetic field and measure a target’s 3D response do so with magnetic field antennas that have complex spatial magnetic fi eld distributions...
The prototype ETD sensor was constructed using commercial off the-shelf technology and was de- signed to demonstrate advanced detection and discrimination capabilities. It differs from conventional metal detectors in several aspects. First, the sensor’s high-speed data collection system accurately mea sures the time-decay signatures of the landmine signature. The prototype ETD sensor was constructed using commercial off the-shelf technology and was de- signed to demonstrate advanced detection and discrimination capabilities. It differs from conventional metal detectors in several aspects. First, the sensor’s high-speed data collection system accurately measures the time-decay signature of the metal object. Second, its bandwidth is about 10 times that of other metal detectors, thus allowing the sensor to detect small, fast-decaying metal objects not normally detectable with a conventional metal detector. And third, the sensor uses a differential or gradiometer coil antenna design that has several advantages over most conventional metal detector coil antenna designs: automatic ground balance, mineralized soil effect rejection, void detection, far-fi eld noise minimization, and cancellation of transmitter coil decay currents...
To read the rest of that article here is the link. untitled
SARASOTA, Fla. (WWSB) - All eyes are locked on the Atlantic tonight.A tropical system known as Invest 97L is showing all the signs of strengthening, and it likely to become the season’s first hurricane in the days ahead.
Some early computer models try to turn it north before it gets close to Florida, but it is simply too early to count on that. We’re tracking every update and will let you know the moment confidence grows in where this storm is headed.
The National Hurricane Center gives it a 90% chance of becoming a tropical depression or storm this week, and it could become a hurricane later. It would be named Erin...
Here is that link.Atlantic season’s first hurricane likely. What it means for Florida’s weather
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| Source: SurfGuru.com. |
As you can see, despite the possible formation of this year's first hurricane, SurfGuru is not showing much of any increase in surf for the Treasure Coast. The storms are a good ways off and there still could be an impact depending upon how things go.
We are going to have today some over three-foot hide tides and a slightly negative low tide.
Good hunting,
TreasureGuide@comcast.net