ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A small, multilayer capacitance sensor (∼70 mm3) for measuring pressure over a broad range at low temperatures is described. The dielectric material is a quantum ferroelectric in the (Cd, Pb)2(Nb, Ta)2 O7 ceramic system, and the reciprocal capacitance varies linearly with pressure into the kilobar region. The average sensitivity of the devices studied is 151 pF/kbar, and the sensor is essentially independent of both intense magnetic fields and temperature below 10 K. A calibration for the slight magnetic field effect is given, and the sensor is dielectrically stable at helium temperatures. A one-point pressure calibration is estimated to be reliable to 〈±0.1%, and pressure changes in the millibar range can be resolved if certain precautions are taken.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1138444
