[time-nuts] Capacitive temperature sensing

[Mike Monett]

  Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:

  >Hej Magnus

  > A capacitive sensing AC bridge can be very sensitive, one only has
  > to look  at the work of RV Jones at the university  of  Glasgow in
  > the 50's, 60's and 70's. He and his collaborators  used capacitive
  > sensors to  detect  (among   other   things)  the  extrusion  of a
  > micrometer shaft  as it was clamped to realise just  how sensitive
  > it can be.

  > They found  it  possible  to detect length  changes  of  less than
  > 1E-11m with a suitably designed sensor.

  > Even more  sensitive capacitance bridge displacement  sensors have
  > since been constructed.

  [...]

  >Bruce

  Bruce, very interesting. I didn't know capacitive sensors  went down
  that low. That could be useful in other areas.

  I searched google but found nothing. Do you have any urls?

  Regards,

  Mike Monett