Abstract
A novel sensor has been developed to measure the mass of very small amounts of powder that are manipulated by a unique dispensing device. The sensor quantifies the mass of the powder by detecting the change in resonant frequency of the dispensing device before and after the powder is released. The measured frequency shift is then correlated to the powder mass by a calibration curve. This paper presents the design and performance of the mass sensor tested with common pharmaceutical compounds. The sensor was demonstrated to measure powder mass between 30 to 70 μg with less than 2.9% standard deviation of error.
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