<p class="Abstract">Mass standards with alternative shapes are difficult to design due to the number of complex parameters. An analytical model based on surface sorption experiments is presented to study adsorption. This model is based on an optimization algorithm that is conceptualized to help to design the best sorption artefacts. Experimental artefacts, cylinder-weight and stack-weight, were of the same volume but different surface areas. This algorithm in essence determines the optimum surface of the artefact. After machining the artefact, surface sorption measurements were carried out. A sorption experiment was done by transferring the artefact from air to a vacuum. Then the surface sorption model was set up which represented the relationship between sorption coefficient, time <em>t</em> and relative humidity <em>h. </em>Logarithmic models were used to fit the variation of sorption coefficient per relative humidity <em>h </em>with time <em>t</em>.</p>
The growing and evolving dynamics in mass and force measurements has inevitably necessitated the need for high precision and accurate results. As a result, measurements in micro-gram (s) and nanoNewtons levels have increasingly attracted potential research interests. In an effort to develop such solutions, the National Institute of Metrology (NIM) has set up a new robot system CCR10 (readability 0.1μg) for accurate measurements of weight (s) ( 1 mg). This system is based on computer controls and linear-drive trains, and is used for calibration/verification of weight (s) below 10 g. A detailed description of the robots metrological parameters and calibration results thereof is presented in the current paper. Keywords: Micro Weights; nanoForce; Automatic Mass Comparator; Robot System; Calibration
Microgram weights have a wide range of applications in the mechanical testing of bio-material sensors and nanotechnology market which typically involves the manufacture of objects with dimensions of less than 100 nanometers. Now it is available with a calibration certificate in National Institute of Metrology (China) that customers can be assured of full traceability to the national primary standard of mass, NO.60, which make allow customers with specialized nanotechnology applications to use the weight values range from 0.05 mg to 0.5 mg with standard uncertainty of just 0.3 μg to 0.08μg.In the paper, an effective method was developed to calibrate weights, along with new methods of calculating uncertainties that would satisfy OIML R111 requirements. This new calibration method involved comparing the weights with the 1 mg standard mass standards using a combination of subdivision and substitution weighing scheme.
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