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Steve M. Taylor
12/15/05 15:09
Read: 648 times
State College

#105307 - Singing wire
Responding to: Lee D Case's previous message
Lee D Case said:

Measurement of the change in quartz crystal resonance due to strain applied to the directly to the crytal itself. Big advantage would be all digital, no analog electronics involved !!.

Hi Lee,
There are methods of measuring torques in shafts by surface acoustic wave techniques that use similar ideas. There are also "singing wire" load cells, where a feedback loop maintains a suspension wire, carrying a current, in an oscillation, as the wire sits in a magnetic field. The resonant frequency is proportional to the square root of tension. They are exquisitely sensitive, but suprisingly narrow range in our experience.

Force feedback is the best way to go for sensitivity. And you can essentially eliminate parametric variation due to mechnical temperature effects using exotic Nickel alloys like NiSpan C.


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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