| ??? 09/16/12 01:09 Read: times |
#188345 - Precision Responding to: ???'s previous message |
Richard Erlacher said:
... I'd point out that the limitation on precision is imposed by the size of the probes. The size is limited by the fact that accidents could cause injury if the probes are very small, even if the pressure is quite limited.
I would not consider moving the probe set while pressure is applied, due to the risk of tearing skin. I'm not sure whether it's more important to measure the probes' deflection concurrently or one-at-a-time. I'm also not sure whether it's more beneficial to measure the probes on a horizontal plane or a vertical one. Both have potential benefit. I'm not even certain that it would be better to use one probe or many. I did mention a nylon wheel on the probe end, to control area, and allow some sideways compliance, and movement. I'd tend to favour one probe, but if you really need to measure fast it comes down to just how fast swelling occurs. A single probe would do a pressure contour sweep in a few seconds, but you would need multiple sweeps to get a full contour. If speed becomes vital, then that pushes you more to multiple probes, with full active pressure intelligence - and away from KISS. |
