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From: Dan Clingman
Subject: Re: non-contact temperature measurement
Sender: email@example.com (Boeing NNTP News Access)
Organization: The Boeing Company
Date: Wed, 4 Sep 2002 00:48:39 GMT
X-Mailer: Mozilla 4.73 [en]C-CCK-MCD Boeing Kit (Windows NT 5.0; U)
If you are after properties and not just performance with current
heating a better solution would be to use a water bath for cooling and
An other option is to build a thermal follower. That is construct a
device that monitors the heat flow from a section of wire then adjusts
the device's temprature to zero heat flow.
"Bill E. L." wrote:
> "Jonathan Kirwan" wrote in message
> > On Tue, 27 Aug 2002 14:37:52 -0700, "Bill E. L."
> > wrote:
> > >Appreciate any ideas/pointers.
> > Do you really want an optical solution?
> not sure really.
> the nitinol wire contacts 4% of it 'cold' length when heated. currently, we
> monitor force on and displacement of an airbearing stage in a spring-mass
> configuration. any contact (welding) to the nitinol would hider that
> contact-section's contraction as well as physically interfering with the
> free movement of the wire. I imagine non-contact would be teh way to go.
> >What kind of resolution and
> > accuracy?
> the temperature range should be 10 - 150 deg. Celsius (up to 600C if not too
> expensive) resolution & accuracy in the range of 0.5C is I think
> nitinol has a tendency to heat unevenly. it would be simply awesome to have
> a thermal image of the full length of the wire. but for now spot temperature
> is fine.
> > How much can you spend on the non-contact measurement
> > point?
> I have no idea how much these systems cost. but I think up to US$3000 might
> be ok with the PI. (I am a grad student at a university:)
> > What kind of deep IR have you tried? Sample rate? Have you
> > considered fluorescent methods?
> haven't tried any yet. all we measure now is force, current, voltage,
> displacement. the action happens over the period of one second. so a 1 kHz
> would be great (am I dreaming ?:)
> > Jon
> really appreciate it.. thanks
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