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LDC0851: Maximum sensing distance

Kamal Kannan
Prodigy 10 points
Part Number: LDC0851
Other Parts Discussed in Thread: LDC1614, LDCCOILEVM, LDC1612, LDC1614EVM

Hi, We need to design a inductive sensor using LDC0851. Kindly confirm whether this will support the maximum distance( >=45mm) between the target and the sensor...If Yes, What are the design recommendations to be followed...

  • 0
    TI__Mastermind 45225 points

    Hello Kamal,

    The typical max distance is about 40% of the coil diameter, but there will be a maximum coil size of about 50mm where the LDC0851 cannot properly drive a larger coil.  

    To achieve longer range, I suggest the LDC1614 device.  This is a high resolution device that is able to achieve sensing distance of 100% or greater than the coil diameter.  It is not a simple switch device like the LDC0851 though.  It requires I2C interface to read the data.

  • 0 in reply to Eddie LaCost
    Prodigy 10 points

    Dear Eddie, 

    Thank you for your response!

    The development is intended for train wheel axle detection. Is the suggested device suitable for this application?

  • 0 in reply to Kamal Kannan
    TI__Mastermind 45225 points

    Kamal,

    I would not be able to say if the device is suitable without more information about the use case. 

    What type of metal is the wheel axle?  I assume it is some type of steel.  While steel can be detected, the range will be shorter due to the lower conductivity of steeel.  Materials like copper or aluminum work best. 

    Can you share any drawings or pictures of where the coil would be located?  

  • 0 in reply to Eddie LaCost
    Prodigy 10 points

    Dear Eddie,

    Please find the link below for more information.

    https://railsystem.net/axle-counter/

    The metal of the Railway wheels and axles are made from high-strength, ferromagnetic carbon and low-alloy steels.

    The above image illustrates a conventional wheel detection sensor configuration, where the TX and RX sensors are mounted on either side of the rail.

     

    We propose to develop an inductive-based sensor for this application. In the proposed design, the wheel flange will be the detection target, and the inductive coil will be located on the receive side of the rail. The expected wheel flange thickness ranges from 22 mm to 30 mm.

     Please let us know if any additional details or clarifications are required from our side.

  • 0 in reply to Kamal Kannan
    TI__Mastermind 45225 points

    Hello Kamal,

    Yes, this seems pretty reasonable for an inductive sensing application.  The difficulty will be the distance from the coil to the wheel flange.  If this is ~45mm, you will need a large coil and it seems like you would not be able to center the coil over the wheel flange.  It may still work, but will require testing in your system.  I would recommend the LDC1612 or LDC1614(difference is number of channels) as these are the highest sensitivity devices.  To test it, the LDC1614EVM and LDCCOILEVM would be helpful.  The coil EVM provides many different form factor coils to test.   

  • 0 in reply to Kamal Kannan
    TI__Mastermind 45225 points

    Hello Kamal,

    Yes, this seems pretty reasonable for an inductive sensing application.  The difficulty will be the distance from the coil to the wheel flange.  If this is ~45mm, you will need a large coil and it seems like you would not be able to center the coil over the wheel flange.  It may still work, but will require testing in your system.  I would recommend the LDC1612 or LDC1614(difference is number of channels) as these are the highest sensitivity devices.  To test it, the LDC1614EVM and LDCCOILEVM would be helpful.  The coil EVM provides many different form factor coils to test.   

  • 0 in reply to Eddie LaCost
    Prodigy 10 points

    Dear Eddie,

    Thank you for your response.
    We will begin testing with the suggested device and request your support during the development phase.