TY - JOUR
T1 - Diamagnetically levitating resonant weighing scale
AU - Chen, Xianfeng
AU - Kothari, Nimit
AU - Keşkekler, Ata
AU - Steeneken, Peter G.
AU - Alijani, Farbod
PY - 2021
Y1 - 2021
N2 - Diamagnetic levitation offers stable confinement of an object from its environment at zero power, and thus is a promising technique for developing next generation unclamped resonant sensors. In this work, we realize a resonant weighing scale using a graphite plate that is diamagnetically levitating over a checkerboard arrangement of permanent magnets. We characterize the bending vibrations of the levitating object using laser Doppler vibrometry and use microgram glass beads to calibrate the responsivity of the sensor's resonance frequency to mass changes. The sensor is used for real-time measurement of the evaporation rate of nano-litre droplets with high-accuracy. By analyzing the resonator's frequency stability, we show that the millimeter graphite sensor can reach mass resolutions down to 4.0 ng, relevant to biological and chemical sensing concepts.
AB - Diamagnetic levitation offers stable confinement of an object from its environment at zero power, and thus is a promising technique for developing next generation unclamped resonant sensors. In this work, we realize a resonant weighing scale using a graphite plate that is diamagnetically levitating over a checkerboard arrangement of permanent magnets. We characterize the bending vibrations of the levitating object using laser Doppler vibrometry and use microgram glass beads to calibrate the responsivity of the sensor's resonance frequency to mass changes. The sensor is used for real-time measurement of the evaporation rate of nano-litre droplets with high-accuracy. By analyzing the resonator's frequency stability, we show that the millimeter graphite sensor can reach mass resolutions down to 4.0 ng, relevant to biological and chemical sensing concepts.
KW - Diamagnetic levitation
KW - Liquid sensing
KW - Mass sensor
KW - Resonant sensor
UR - http://www.scopus.com/inward/record.url?scp=85107269052&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2021.112842
DO - 10.1016/j.sna.2021.112842
M3 - Article
AN - SCOPUS:85107269052
SN - 0924-4247
VL - 330
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
M1 - 112842
ER -