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
    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.

    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