Thermal expansion/contraction of lens

Discussion in 'General Electronics Chat' started by deepak.midri, Sep 15, 2014.

  1. deepak.midri

    Thread Starter New Member

    Jun 2, 2014
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    Application:
    to measure the thermal strain of optical lens. Due to temperature variation the lens surface is expanding / contracting in radial direction with two extreme operating temperature. (-40C to +70C )
    Optical lens is SF56A (CTE - 7.9*e-6 per Kelvin)

    What to do:
    I need to measure this expansion/contraction of lens. I think I can do that by strain gauge. But I was looking for some earlier references on internet as bonding on gauge is very tricky. Even a small scratch on lens can deteriorate its performance. So I need to very careful while bonding gauge on it.

    Questions:
    1. Anyone have previous exp/suggestion on how to bond the gauge & its placement.
    2. Any references on internet.
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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