Other Parts Discussed in Thread: LDC1614, TIDA-00509, LDC1101, TS3USB30E
Hi,
I'm developing a inductive sensor using LDC1314.
The sensor should be able to detect a coin type metal (10mm minimum diameter, steel, 2mm thickness) object presence on a flat surface (25x100mm shape).
The trouble is to increase the distance of detection up to 10-15mm.
I tried with a single coils rectangular 4 layers but the frequency shift is limited to few percentual points and the detection distance is few millimeters.; resonant frequency is around 400kHz.
I'd be grateful if you can send me some suggestions on coil design:
- frequency: does lowering the frequency increase the detection distance?
- number of coils to cover the surface: am I supposed to use more than one coil? I tried a single 4 layer 25mm diameter coil with limited but sufficient performance. 3 coils side aligned?
- multiplexing: I can use multiple multiplexed coils (other built-in channels are already used in my application); shall I switch off the current before switching the coils (external mux on a single LDC channel)
I refer to the example:
Thanks in advance