Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (1): 114-119.DOI: 10.11944/j.issn.1000-0518.2019.01.180321

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A Least Square Estimation Based Quartz Crystal Microbalance Resonant Frequency Detection Method

LIU Zhenbangab,MA Yingminga,WANG Weia,HAN Dongxuea,BAO Yua,DONG Xianduia*()   

  1. aEngineering Laboratory for Modern Analytical Techniques,c/o State Key Laboratory of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry,Chinese Acdemy of Sciences,Changchun 130022,China
    bUniversity of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2018-09-29 Accepted:2018-10-10 Published:2019-01-01 Online:2019-01-04
  • Contact: DONG Xiandui

Abstract:

The impedance analysis quartz crystal microbalance has many advantages such as wide application range and more parameters, but the resonance frequency of the quartz crystal obtained by the impedance analysis method takes a long time and has poor real-time performance. In response to this problem, we analyzed the process of data fitting when using the least squares method and proposed a fast detection method for quartz crystal resonant frequency measurement. By adjusting the data coordinate system, the calculation time used for the fitting process reduced obviously. The new method was verified by experiments, compared with the traditional least squares method, the efficiency of the algorithm for calculating the resonant frequency was improved by four times, and the calculation accuracy was higher. It means the new method has high practical value.

Key words: quartz crystal microbalance, least squares, resonant frequency