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metal identification

Masaharu Takahashi
Expert 4170 points

Hi, All.

This is Masaharu Takahashi.

today I'd like to confirm 2 things

1. identification metal type by LDC

2.suitable LDC series for identification metal type.

to identify metal type.

LDC can identify which type of metal by its ρ(metal resistance).

each metal resistance have to be different right ?

to find which one is suitable for identification.

LDC1000 also can be working but LDC1100 is better than 1000 right ?

could you reply for me?

  • 0
    TI__Genius 13650 points

    Hello Takahashi-san,

    for metal identification, you can use the LDC1000, because it offers both L and RP measurements, and it can support the lowest sensor oscillation frequency.

    The metal to be identified needs to be at a fixed distance away from the sensor. Sensor oscillation frequency should be as low as possible; LDC1000 supports a minimum oscillation frequency of 5kHz. Please ensure that the metal to be measured is at least 3 skin depths thick at the oscillation frequency (6 skin depths is better).

    You will need to perform an L measurement and an RP measurement of the metal. This will give you information on permeability and conductivity, respectively. 

    You can map the RP vs L values of several metal types on a 2D map and store it in a look-up table in the MCU. This can be used to identify which metal is present. 

  • 0 in reply to Ben Kasemsadeh
    Prodigy 10 points
    I've tested the LDC1000 on various metal targets. By varying the distance I've observed that the slope dRp/dL is a constant and it's different for every metal.
  • 0 in reply to Oscar Gonzalez
    Prodigy 20 points

    Hie,

    Did u check by varying the size of metal target?