Hi guys,
I now have a need to mesure the axial distance between the target and the sensor, and the maximum distance is about 2mm, meanwhile, I want to have a resolution as good as 0.1um.
I opened the webench and had some possible solutions, but none of them are good enough for me, for because of the space limit, the diagram of the PCB coil has to be less than or equal to 7mm, also, the target size has to be less than 7mm*7mm. But the webench gives a miminum diagram of the PCB coil of about 8mm using 4-layer PCB.
The fact is that we can use PCB coil of with more layers such as 6 layers to shrink the diagram and also maintain coil inductance.
1. Can webench be used to help design a 6-layer PCB coil?
I noticed that when using the Webench tool to generate a LDC1000 design, the solutions are the diagram of the target is comparable to the diagram of the PCB coil, or the diagram of the PCB coil is bigger. But in our use case, we would like to have a bigger target and a small coil(because the whole parts have to be place in a 10mm diagram metal tube, and the PCB coil would be affected too much if the ratio of the coil diagram and the distance(between the coil and tube) is too small), such as a 7mm*7mm target with a 3mm in diagram PCB coil.
so we would like to know,
2. Can LDC1000 work using a PCB coil smaller than the target and still have a good resolution and linearity as good as the normal situation?
3. what is the suggested ratio of the coil diagram and the distance(between the coil and covering tube) if we want the affects of the metal cover is minimized?
Thank you very much!
