On the improvement of the metrological properties of manganin sensors

The paper presents the recent progress made in the accuracy improvement of the manganin pressure sensors at the Warsaw University of Technology (WUT) and at the Institute of Nuclear Energy. The efforts of the authors were concentrated on three problems: (1) The improvement of the temperature characteristics by the design of a manganin sensor with the temperature compensation achieved by the application of two manganin coils with two different temperature characteristics; (2) The improvement of the calibration process by (a) using a high pressure deadweight piston gauge (with the correction of effective area versus pressure dependence, built at WUT), (b) measurements of the manganin resistance as a function of the temperature and of the pressure using a precise multimeter and (c) application of statistical methods for long series of measurements. (3) The modification of the thermal characteristic by implantation of bismuth and krypton ions.