); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi John,
Neon John wrote: > A somewhat related question. Can a quartz crystal be used as a pressure > (actually > medium to high vacuum) sensor? Specifically, over the range of perhaps 1 > Torr to > 1e-6 Torr. IOW, over about the same range as a thermocouple gauge. > > At first blush it would seem a natural application. Not knowing what the > second > blush is.... :-) First of all there would not be much frequency change compared to the undesired effects from temperature, aging, and probably hysteresis for a one Torr pressure difference, and the scale would not be logarithmic as desired by a vacuum meter. In principle such a sensor would work only, if you put the crystal into a box, which is sealed at a reference pressure, and a mechanical force proportional to the pressure difference is suitably applied to the crystal through a membrane. So such a sensor would be rather complex and would have very low sensitivity with a linear scale from 0 Torr to 1 Torr - which is probably not what you wanted to consider. Regards Bernd DK1AG www.qsl.net/dk1ag _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
