PRECISE MASS AND VOLUME DETERMINATION OF THE SILICON SINKER FOR SEA WATER DENSIMETRY

Y. Kayukawa, Y. Fujita

Abstract

In order to improve measurement performance in sea water densimetry which is important in global environmental monitoring, a hydrostatic weighing system is under development in the NMIJ. A 100 g silicon sinker is used as a density reference and it is required to calibrate its mass and volume with higher accuracy that the conventional calibration procedures. In the present study, sub multiple mass measurement was conducted by using 1 kg silicon sphere and newly designed silicon disc weight set. The mass uncertainty was decreased to less than 0.01 mg for the silicon sinker. The volume of the sinker was measured by using a pressure-of-floatation method (PFM) to realize the relative uncertainty of the volume being 0.17 ppm.

Keywords

silicon single crystal, density, mass, submultiple, hydrostatic weighing

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IMEKO-TC3-2014-022.pdf

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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