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???
09/19/12 13:52
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 		 #188400 - I do not know if this is relevant, but
Responding to: ???'s previous message
evidently there are "digital silicon pressure sensors" available

I became aware of the existence by seing the below (yes, I know you do not want to measure air pressure, but is that the only thing such things (or other "digital silicon pressure sensors"?) can be used for

World�s smallest digital silicon pressure sensor enters high-volume production

ST�s latest pressure sensor, the LPS331AP, allows mobile phones and other portable devices to calculate their vertical elevation relative to sea-level with very high accuracy - not just the floor of the building where it is located, but almost the step of the staircase. This kind of information is essential for location-based services and indoor navigation. Housed in a tiny 3 x 3 mm package, and offering low voltage operation and ultra-low power consumption, the LPS331AP measures air pressure from 260 to 1,260 mbar. Samples and evaluation kits are available to support design-in and shorten time-to-market. More


List of 49 messages in thread
TopicAuthorDate
How would you do this?            01/01/70 00:00      
   I have no idea if this would work, but ....            01/01/70 00:00      
      How would one actuate them?            01/01/70 00:00      
   strain guage            01/01/70 00:00      
      Yes, you might be onto something.            01/01/70 00:00      
         Computer-controlled?            01/01/70 00:00      
            computer controlled            01/01/70 00:00      
               Calibration + redundant force-limitation            01/01/70 00:00      
               Interesting problem            01/01/70 00:00      
                  Yes, it seemed coarse, at first.            01/01/70 00:00      
                     Precision is cheap ?            01/01/70 00:00      
                        I don't follow ...             01/01/70 00:00      
                           Precision            01/01/70 00:00      
                              other considerations            01/01/70 00:00      
         Tomographic imaging?            01/01/70 00:00      
            There's one major problem ... maybe two ...            01/01/70 00:00      
               $100 MRI unit            01/01/70 00:00      
                  I'm not sure ...             01/01/70 00:00      
         Voice coil and LVDT?            01/01/70 00:00      
            Not having a lot of experience with this sort of stuff ...            01/01/70 00:00      
               Danger/problems with hydraulic since no spring effect            01/01/70 00:00      
                  A few things puzzle me with this approach            01/01/70 00:00      
   Ultra Sound Probing            01/01/70 00:00      
      Ultra-sound is better for measuring surface or sub-surface            01/01/70 00:00      
   I would not use volumetric imaging            01/01/70 00:00      
      I'm not sure what you mean            01/01/70 00:00      
         another thought            01/01/70 00:00      
            I consider that one of the more "pregnant" approaches            01/01/70 00:00      
               Lots of options available            01/01/70 00:00      
                  You've got to consider cost            01/01/70 00:00      
                     Cost/safety            01/01/70 00:00      
                     Cost target?            01/01/70 00:00      
                        The price target comes from a few prosthetists            01/01/70 00:00      
   comercial CMM            01/01/70 00:00      
      This only received cursory examination             01/01/70 00:00      
         pneumatic actuator            01/01/70 00:00      
            Yes ... but what would this cost?            01/01/70 00:00      
               100 rods?            01/01/70 00:00      
                  Patient size ...            01/01/70 00:00      
                     That's what I'm considering            01/01/70 00:00      
                     AAACK! ... another double post ...             01/01/70 00:00      
                  it's not as big as you think!            01/01/70 00:00      
                     90% coverage            01/01/70 00:00      
                        So maybe vacuum pump for the too fat people            01/01/70 00:00      
   I do not know if this is relevant, but            01/01/70 00:00      
      I'll have to look into this.            01/01/70 00:00      
         Single air pressure sensor sensor for tip force guestimate            01/01/70 00:00      
   What about infrared?            01/01/70 00:00      
      How would you do this so it would retail for under $5k            01/01/70 00:00      

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