XIAO Qi-jun,LUO Zhong-hui,GUO Da-wei.column:Three-DoF weakly coupled resonator micro-balance for mass detection[J].Optics and Precision Engineering,2021,29(02):297-304.
XIAO Qi-jun,LUO Zhong-hui,GUO Da-wei.column:Three-DoF weakly coupled resonator micro-balance for mass detection[J].Optics and Precision Engineering,2021,29(02):297-304.DOI: 10.37188/OPE.20212902.0297.
column:Three-DoF weakly coupled resonator micro-balance for mass detection
To measure micro-masses effectively, a three degrees-of-freedom (3-DoF) mode localized weakly coupled resonator micro-mass sensor was proposed in this study. The equations of motion of three resonators were established, the system equations of mass disturbance were obtained, and a MATLAB/SIMULINK model of a 3-DoF coupled resonance system was established. The study determined that the variation in amplitude ratio has the highest normalized sensitivity compared with the variation in amplitude and frequency shift. The sensor was designed and fabricated using micro-electromechanical system (MEMS) technologies, and a mass measurement system was also developed. Experimental results reveal that the normalized sensitivity of the change in voltage amplitude ratio is approximately four times the change in amplitude. In addition, approximately two orders of magnitude of resonant frequency shift occurred, and the minimum detectable mass is 2 ng. Simulation and experimental results prove that the 3-DoF mode localized weakly coupled resonator can effectively measure micro-masses and thus has good prospects for bio-sensing applications.
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