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Looking for a solution for the given specifications. Guidance much appreciated.

Mitchell Bullock
Prodigy 10 points
Other Parts Discussed in Thread: LDC1612

I am currently a student at Texas A&M University.  I am seeking a solution for a problem I have encountered in the lab.

Basically, I am looking for a sensor capable of detecting whether a large steel object is or is not present.

The catch is that the sensor and target are separated by up to 2 inches of air.  

I would imagine that the most-likely solution would be an inductive sensor.  However, I have been unsuccessful in finding a capable sensor.  

Specifications are as follows:

  • The sensor & the target are separated by up to 2-inches of air.
  • No constraints on the sensor technology -- inductive, optical, RF, etc.
  • Sensor must work in an environment of periodic rain & dirt.
  • A 6.6VDC supply is available to power the sensor.

I would greatly appreciate any suggestions / direction for a solution on my project.

Thanks!
Mitchell

  • 0
    TI__Genius 13335 points
    Hello Mitchell,
    Inductive sensing can work well to detect steel objects as well as other conductive surfaces. There is a relationship between sensing range and the inductor coil diameter. For a 2inch sensing range you will likely need a coil diameter of >2inches to get the best sensitivity. For more information on the application of inductive sensors I would point you towards our technical collateral: www.ti.com/.../inductive-sensing-technical-documents.page
    Specifically take a look at the following application notes:
    LDC1xxx LDC Target Design - SNOA957 ( www.ti.com/.../snoa957)
    LDC Device Selection Guide - SNOA954 (www.ti.com/.../snoa954)
    LDC Sensor Design - SNOA930 (www.ti.com/.../snoa930)
    Regards,
    Luke
  • 0 in reply to Luke LaPointe
    Prodigy 90 points

    Hello,

       Can the LDC1612 drive a 2-inch coil?

  • 0 in reply to Hua59491
    TI__Genius 13335 points
    Hello,
    The LDC1612 is not limited to a specific diameter of coil. What is important is the RP and frequency of the sensor. You can use the LDC tools spreadsheet to determine if your specific coil parameters fall within the design space or not: www.ti.com/.../slyc137
    The "Spiral_Inductor_Designer" tab will allow you to check specifically for the LDC161x or other LDC product.
    Cheers,
    Luke