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Metal Detectors
General Metal Detector Discussion
Metal detector testing
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<blockquote data-quote="Heatho" data-source="post: 288564" data-attributes="member: 487"><p>You'll get a better signal if a metal object is in situ due the "halo effect", a small target that is just on the verge of detection can give a better signal when it is in the undisturbed ground, dig it out and it may not be detectable after being disturbed as the halo effect will disappear. </p><p></p><p>I've seen this happen a few times, last time it happened to me started up my SDC to find it but the batteries were dead and it kept shutting down.....</p><p></p><p>From the GPX5000 manual.</p><p></p><p>"A halo effect, which may be built up around a buried metal</p><p>object, makes the object appear to be larger to the detector</p><p>than it actually is. This will be reduced once the target is</p><p>disturbed from its position in the ground (e.g. a small object,</p><p>detected at a substantial depth, may be more difficult to</p><p>detect once disturbed from the ground and lying in the</p><p>loose dirt. If the object is re-buried the halo effect will not</p><p>be present).</p><p></p><p>Also.</p><p>Halo Effect</p><p>After a metal object has remained undisturbed</p><p>in the soil for a considerable amount of time</p><p>a diffusion occurs around the object. This</p><p>has the effect of the object appearing to the</p><p>detector to be a larger size.</p></blockquote><p></p>
[QUOTE="Heatho, post: 288564, member: 487"] You'll get a better signal if a metal object is in situ due the "halo effect", a small target that is just on the verge of detection can give a better signal when it is in the undisturbed ground, dig it out and it may not be detectable after being disturbed as the halo effect will disappear. I've seen this happen a few times, last time it happened to me started up my SDC to find it but the batteries were dead and it kept shutting down..... From the GPX5000 manual. "A halo effect, which may be built up around a buried metal object, makes the object appear to be larger to the detector than it actually is. This will be reduced once the target is disturbed from its position in the ground (e.g. a small object, detected at a substantial depth, may be more difficult to detect once disturbed from the ground and lying in the loose dirt. If the object is re-buried the halo effect will not be present). Also. Halo Effect After a metal object has remained undisturbed in the soil for a considerable amount of time a diffusion occurs around the object. This has the effect of the object appearing to the detector to be a larger size. [/QUOTE]
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Metal Detectors
General Metal Detector Discussion
Metal detector testing
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