Feb 16, 2017 - It goes over all the points, and as soon as one think that the. The induction sensor is not designed to search points in the XY plane. Point Sensors now have an area-of effect that lasts 2.5 seconds. Any player that enters the area of effect during that time will be tracked. The total amount of time a player will be tracked can change depending on when the player enters the point sensor's area of effect.
Click to expand.All the units I have seen are based on an internaloscillator (a few hundred kilohertz for he small ones) and ameans to measure the eddy current load on that oscillator,with a decision point to switch the output logic signal,indicating metal in the field at some specific magnitude ofeddy current load on the oscillator coil. The two maintypes are ones that spray field out all around the end ofthe coil, as well as in front of it, and those that havefield shaping cores that keep almost all of the field infront of the coil (concentric poles), so that the unit canbe flush mounted in a hole in metal without seeing thismetal, or close bedside other units, without interactingwith each other. The down side of the shielded form is thatit cuts the sensing range for a given diameter unit, aboutin half. Click to expand.You may want to get a large surface diameter type. All the units I have seen are based on an internal oscillator (a fewhundred kilohertz for the small ones) and a means to measure the eddycurrent load on that oscillator, with a decision point to switch theoutput logic signal, indicating metal in the field at some specificmagnitude of eddy current load on the oscillator coil. The two main typesare ones that spray field out all around the end of the coil, as well asin front of it, and those that have field shaping cores that keep almostall of the field in front of the coil (concentric poles), so that the unitcan be flush mounted in a hole in metal without seeing this metal, orclose bedside other units, without interacting with each other.
The downside of the shielded form is that it cuts the sensing range for a givendiameter unit, about in half. Click to expand.Man, it has been a long time since I last built a 1transistor oscillator. I plinked around a little andquickly discovered that I have the supply current situationbackwards.The oscillator is biased to draw a significant andcontinuous supply current, but once it gets going, therectification effect of the base junction kills the forwardbias for most of the cycle, greatly lowering the averagecollector current, concentrating it into narrow pulses atthe positive peak of the cycle.
Putting a piece of metal inthe inductor field not only lowers the inductance, but alsothe Q, so the oscillation tends to start and die out,rapidly, so that the transistor spends most of the time inan intermediate state between no oscillation (high current)and active positive feedback oscillation (class C lowcurrent operation). The hardest part for me to model is theeddy current losses in the target as the distance is varied.