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Basketware sensor detector 

Koschey-5I/IM 

Among the fans of pulse metal detectors basketware enjoy an excellent

reputation. With their help one can obtain a record depth of detection for small objects

the size of a coin. Design features of these sensors yield increase detection depth of

targets up to 20% compared to the comparable "normal" sensor.

Let us consider briefly the physical processes in place to achieve this growth. In a

typical sensor coil wound wire coil to coil. With such a sensor has a winding interturn

stray capacitance of the order of hundreds of picofarads. This capacitance transient

delays caused by the momentum of self-induction, approximately 10 30mks. It is within

such limits must exhibit a delay signal processing ( main delay in the foreign

terminology) in the pulse detector . Basketware sensor is wound in a special

way, minimizing the interturn capacitance. To do this, the coils are spread in space andat an angle to each other. A typical interturn capacitance sensor basket is in the range of

tens of picofarads. If this capacity does not exceed the transition units of microseconds,

which allows to make the instrument more "early" signal processing of the target and

the result - a gain in sensitivity.

In the past we have developed a couple of designs   basketware sensors to our earlier

 pulse detectors. In this article we want to offer another new design, which can be

mounted in a universal  plastic case , available for sale.

This case has only a limited cavity for the sensor coil, so the winding way "on a bed

of nails" as used in our previous developments, here is not very suitable. Here we need

to rewind a special bearing mandrel made of thin sheet material (0.7-1.5mm). It may be,

for example, glass fiber, getinaks or, in extreme cases, even thick cardboard. Patternmandrel to download here , then print the file at 1:1 and glue on a sheet of plastic. Then,

use the jigsaw (needle files, scissors, a drill) to cut the ring with the slots, according to

the figure . The width of grooves about 2 mm.

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Then proceed to the winding coil sensor. For this we need about 20 feet enameled

magnet wire diameter 0.63mm. For convenience, it is desirable to pre-wire winding

wound on a shuttle length 15-20cm, or a small coil of appropriate size. In the winding

wire to hook or coil - is necessary to make sure that the wire does not twist, wassubjected to strong bending, did not form small loops spanning. The principle of the

winding is shown in the figure below. Wire to wrap around the mandrel, putting it into

the grooves. The number of slots is chosen so that after five full turns and grooves are

filled with all the wire "comes" at the start point of the winding layer. In this case, you

need to make the transition to the adjacent groove and start to wind the next layer. All

you need to wind the 30 turns or 6 layers of 5 turns.

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The result is roughly the winding.

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 Next, mount the coil inside the sensor housing. Further assembly and wiring for the

same  procedure as for the conventional sensor. The only difference - for proper

recognition Koscheem-5I/IM basket sensor connector to solder resistor 30kOm. In this

case the profile will be activated 3.x, which by default are set to basketware and other

experimental probes. For more information on where there 

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After assembly, connect the probe to the detector Koschey-5I or Koschey-5IM and

check availability.

Findings 

In laboratory tests yielded the following parameters:

Inductance coil - 317mkGn.

Interturn capacitance - 80 pF.

Winding resistance - 1 ohm.Detection range of coins 5kop USSR - 31cm.

Thus, we see that by reducing the interturn capacitance and properly configuring a

metal detector (the ability to configure them - an important feature Koschey-5I/IM)

obtained a very real increase in the depth of detection of the target. However, it should

 be noted that this sensitivity is obtained for air. In the real ground winning basket sensor

may not be as significant. Everything will depend on the degree of mineralization in a

 particular area - for example, in sandy soil depth will be larger in the black soil - a

smaller one. The fact that a decrease in processing delays, unfortunately, but to improve

the overall sensitivity and increases the sensitivity to the ground.  

Separately, we want to draw your attention to the fact that the struggle forreducing interturn capacitance is not justified in each sensor. For example, we

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sometimes ask - and it would be nice to do "deep basketware sensor" size or 1h1m

2h2m . The answer - it is absolutely unjustified. The fact is that when working with

deep probes instrument specially configured to work with high-latency processing. This

is to reduce the sensitivity to the soil and shallow targets. Therefore, there is no reason

to fight for the reduction in the duration of the transition process, as well as delay its

 processing significantly exceeds.