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TMP006 field of view

Greg Austic
Prodigy 40 points
Other Parts Discussed in Thread: TMP006

We recently purchased a TMP006 and I have a few questions:

1. I've read in TI's manual and on the forums about using a small metal plate with a hole in the middle to direct (or limit I guess) the field of view.  Does anyone know where these might be commercially available (like from mouser or digikey)?  It's a great idea, but a pain if we have to make it ourselves.

2. Is it possible to use a piece of smooth aluminum tubing (like this: http://www.mcmaster.com/#standard-aluminum-tubing/=p6l47h) to direct the IR onto a specific surface?  It's easier to place the tubing in our case because we can create a consistent hole in the device casing, slip in the tubing, line up the tmp006 and we're good to go.  The tubing would be <2'' long, and would sit up against the surface of the tmp006.  Has anyone done this, and if so have you had good results? 

3. We've also considered shiny, low emissivity coatings which we could coat a hole in the product case with to direct the signal.  This would potentially also be a simple solution.  Any thoughts/experiences on this?

 Thanks for the help -

Greg

  • 0
    TI__Intellectual 1811 points

    Greg,

       The small metal cans are not commercially available.  I designed some and had FotoFab make me some. The prototypes are flat and I have to bend them.  See the pictures below.  www.fotofab.com

       As for #2.  Keep in mind that you want to keep  any lid, tube, cover  as close to the die temp as possible so it does not become an ir emitter.  The shinnyer the better.  So we solder our lids to the ground plane that encompases our wcsp footprint.  Also keep in mind that any and I mean any field of view restriction gives you lower signal.  Which initially seems bad, but the quality of that lower signal is more of what you really want.  Also the fruther away from the device the target is the lower the signal will be. 2" will decrease your signal significatly.

     

    As for #3.  This is a good idea.  We have played with gold plating on the top side of the die and it definatly restricts the field of view.  The die are so small that i'd imagin it would be tough todo manually but if you have some type of micro screen printing operation, that might be a great solution. 

     

    If you tell me more about your application I may be able to help.  Is it a commercial application?  Are you using the recommended footprint from the TMP006 users guide?

    Hope this helps,

    Regards,

    Tommy Santoyo

    TI Sensing Apps