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LDC3114: Inductive sensing can recognize metal target materials?

Ernest Cho
Expert 3111 points
Part Number: LDC3114
Other Parts Discussed in Thread: LDC1101, LDC0851,

Hi team,

Can our inductive sensor recognize metal materials differences?
I've seen material target graph which might recognize the materials on Figure 2-1 with below link.
https://www.ti.com/lit/an/snoaa76/snoaa76.pdf 

Customer application is induction range and they want to recognize like AL1100, Steal and Stainless steel.
Target distance from the pot coil is fixed (4~6mm) and target area is large enough (over 100mm radial).

If we could, then which device could be the best? (LDC3114, LDC211x, LDC161x, LDC0851 and LDC1101)

Or if we can't, then would you roughly explain the reason?

Best, 
Ernest

  • 0
    TI__Mastermind 18545 points

    Hello Ernest, 

    Changing the metal material with a fixed target distance can cause a different frequency shift on the sensor. (adding the graph you mention for ease of viewing)

    If you assume you have a low normalized distance, it would be easier to detect the difference between metals based on the frequency shift alone. But if there goal is mainly to determine the difference between metal types, then the LDC1101 might be a better choice. The LDC1101 has an Rp measurement that varies more with different metal materials and combining the inductance and Rp measurements can help distinguish between the different metals. 

    Best Regards, 

    Justin Beigel