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LDC1101: Detecting small metall particles

Victor Kot
Prodigy 230 points
Part Number: LDC1101

Good afternoon friends!

I recently asked a question on the forum about detecting small particles. Unfortunately, as I was told, there is currently no information on what particles are able to uncover the LDC. It is necessary to compensate for this knowledge gap.
All the same, I want to understand this. We know that the LDTS1101 has some limitations in the construction of the sensor (the frequency should be from 500 kHz to 10 MHz, Q-factor from 10 to 400, etc.). Question: what parameters of the coil should be to detect the smallest particles?
I understand that the frequency needs to be increased (in order to achieve large losses in the eddy currents in the target), it may still be necessary to strive for greater inductance and lower capacitance, because the magnetic field in this case will be greater) ??
Or some more tips / comments?

  • 0
    TI__Genius 14270 points

    Hi Victor,

    I assume you are referring to detection of groups of granular conductive materials such as dust from milling out metal. There are many unknowns in what you are asking - the concentration, composition, size, and distance to the sensor. The only advice I can recommend is to use a higher sensor frequency. This will allow for shallower eddy currents that can "fit" into the small particles.

    Regards,

    ChrisO

  • 0 in reply to Chris Oberhauser66
    Prodigy 230 points
    Well thank you.
    In addition to high frequency, more tips?
    Let's assume that we use a high frequency of 1 MHz.
    But this frequency can be achieved with a circuit of 85 pF and 300 μH OR of 300 pF and 85 μH. In both cases, the frequency is about 1 MHz.
    Are there any tips about the inductance / capacitance / Q-factor except the frequency?
  • 0 in reply to Victor Kot
    TI__Genius 14270 points
    Hi Victor,

    I am thinking of a sensor frequency of >7MHz. You do not need a large amount of inductance with the LDC1101; consider reducing the inductance to <80uH by using less layers. Refer to the LDC sensor design application note ( http://www.ti.com/lit/snoa930 ).

    Regards,

    ChrisO
  • 0 in reply to Chris Oberhauser66
    Prodigy 230 points

    Thank's.
    Carried out experiments with a frequency of 0.7 MHz to 10 MHz. There are no differences in the detection of particles.

    I will be grateful if someone will give information / link where there is a rarity of discovery of the smallest metal particles