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LDC1000 application question

jjjj
Prodigy 190 points

We are considering using the LDC1000 in our sensor application. The sensor is going to detect openings in an aluminum construction (see attachment). The detector will move along the construction with a maximum speed at 3m/s. There will be two different distances between the sensor and the construction; 2.5mm and 12.5mm.

We are only interesting in the location to the gap in the construction, not the distance to the construction (ie if we have gap or not). Is it possible to detect the edges of the construction with a reasonable accuracy (1/10mm)?

How would you design the sensing coil to gain highest possible accuracy (could a squared shaped coil give a better reading?)

Drawing1.pdf
  • 0
    TI__Genius 9300 points

    Hello,

    The depth of the opening is given as 8mm in pdf, while you indicate that it is 10mm?

    Regarding the edges - are they well-defined, i.e. are they the same of shape/profile for all openings?

    If yes, I would plot LDC data vs x position, and correlate the curve to the actual edge position.

    If the size of the opening is always the same, then it's even easier, as the peak in LDC data will be easy to see.

    I would start with 1cm dia coil. Anything below will work as well, above 1cm coil dia you will start loosing resolution, but it still should be fine up to 2.5cm diameter.

  • 0 in reply to Evgeny Fomin
    Prodigy 190 points

    Hi,


    The depth of the profile is 8mm, the distance from the sensor to the top of the profile is for the first sensor 2.5mm and the second one 12.5mm this give a max depth of 10.5mm and 20.5mm.


    The edges are well defined and the size of the opening is always the same (off course there are some deviations). The distance between the edges/gaps are also the same.


    The purpose of the sensor is to update the x-position using the edges as references. So I have to detect these edges with a high degree of precision (if possible with a maximum error of 1/10mm),

  • 0 in reply to jjjj
    TI__Genius 9300 points

    Do you need to find the edge as the sensor moves over it, or can you go over the whole deep before you report edge position?