Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Where the coating acts as dielectric material. The thicker the coating, the thicker the dielectric, the more the distance between electrodes, the smaller the capacitance.
Where the coating acts as dielectric material. The thicker the coating, the thicker the dielectric, the more the distance between electrodes, the smaller the capacitance.
In your case some research will have to be undertaken. There are commercial instruments utilizing eddy currents for measuring coating thickness on flat steel or aluminum. For other shapes you will have to modify sensor shape and take several calibration steps with gradually increasing coating thickness. You can use simpler capacitive sensors but again, the sensor contact shape must be modified to your object shape and calibrated with growing coating thickness.
Without further details, it is hard to say much. What is the coating? and how large and consistent are the springs? I feel that a capacitive method could be very difficult to archive, as the parasitic shunt capacity would swamp the value you are trying to measure.
I fancy using the cross section(or part of it) to complete the magnetic path between the jaws of a pair of soft iron tweezers, which you plunge into the coil capturing part of one turn (needs a stop for constant insertion depth?). If a low frequency energised coil on one leg, the magnetic field goes down one leg through the crossection of the wire then up the other leg into the other end of the coil. Any shunt effects would be minimal.
Frank
thank you for the information. i need to know further how to take out ONLY the coating for different coating/base material combinations. if you have any experience in this field, pls help me.
Can't see the photo. Placing the link in address bar brings a photo but I guess it is not spring related.
Chemically removing the coating is easy and accurate. Google search with the words "[coating name] stripper", you will get many stripping chemicals. For example NISTRIP removes nickel coating from many different base materials and SUPERSTRIP MS removes many different coating materials from steel. Reference link: http://www.pcichemicals.com/electroplating-product.php?sid=273
If chemically removing the coating is not possible, then you can try with mechanical abrasion method. Repeatedly apply abrasion on a specific area of the sample and after each time compare it's color with neighbouring area. When a clear visual difference is found with exposed color of base material then coating removing is done.
You can also burn the coating and scrape off the residual.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
