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Steve M. Taylor
12/11/05 10:16
Read: 645 times
State College

#105054 - LVDT
Responding to: Bruce Bailey's previous message
Hi Bruce,
My two-pennorth,

Go LVDT. Its relatively easy to get extremely good results, low drift etc. We use Schaevitz LVDTs. You can buy readout boards, or, I can supply you with a board with an analogue output if you are interested. We have 25 years of practice in making stable, low drift lVDT systems.

I'd mount your LVDT body on a un strained bracket just beneath your proving beam, so that you can eliminate thermal expansion in your systems. Bear in mind too that spring rate is ALSO temperature dependent, and you may or may not need to allow for that.

The capacitance method we used for our sensors would be even better, but takes a lot more setting up - it used my favourite technique of transformer bridges.We had a metal ring, with a ceramic plug in the centre perfectly suspended in the centre. On the plug are 4 capacitor plates, deposited by reduction firing silver oxide, which are wired to the bridge.


List of 17 messages in thread
electromagnetic force transducer      Rao Np      12/09/05 06:12      
   electromagnetic force transducer?      Russell Bull      12/09/05 18:31      
      Agree      Steve M. Taylor      12/10/05 04:37      
         load cells      Terry Lingle      12/10/05 07:29      
            Time constant      Steve M. Taylor      12/10/05 08:02      
               sensor      Terry Lingle      12/10/05 19:37      
                  Strain gauges ?      Steve M. Taylor      12/11/05 05:20      
                     LVDT?      Bruce Bailey      12/11/05 09:33      
                        LVDT      Steve M. Taylor      12/11/05 10:16      
            Strain gauge      Oliver Sedlacek      12/13/05 14:55      
               Hmm      Steve M. Taylor      12/13/05 15:13      
                  LVDT and Strain Gauge devices      Lee D Case      12/15/05 13:19      
                     Eh?      Andy Neil      12/15/05 14:12      
                     Singing wire      Steve M. Taylor      12/15/05 15:09      
                        LVDT      Robert Revens      12/16/05 10:04      
                           LVDT      Lee D Case      12/16/05 11:36      
                              Mine too      Steve M. Taylor      12/16/05 13:09      

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