Study of Series Piezoelectric Quartz Crystal system and Its Application on Conductivity Measurement

• Main Authors: Wen-Yiing Chang, 張文穎
• Other Authors: Hsien-Chang Chang
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/13816078328693564865

碩士 === 國立成功大學 === 醫學工程學系 === 84 === In this study, a reliable hardware was set up. According to the result from a simulated resistance model and conductivity adjusted by a various potassium chloride concentrations, we know it exists a critical point of oscillating frequency curve and can be controlled by some of altering parameters; (1)Oscillating frequency decreases by exponential as the height of solution increases. (2)Oscillating frequency increases as cell-constant decreases. (3)Viscosity contrary to conductivity was proven by the frequency response of conductivity and viscosity in SPQC system. The home-made SPQC system is also applied to the analysis of titration, the coagulation of blood and the detection of microbial growth, respectively. By the procedure of precipitation or neutralization of ion while titration, the ion concentration could be detected. The detecting limit could reach 0.1mM due to the deviation of conductivity in this system. In the investigation of blood coagulation, the plasma and whole blood reveal different behavior in conductivity. The mechanism of blood coagulation is not fully aware. The application of coagulation test still need further research. At the latest, we have been tracking on the growth of microbe. The wastage of metabolism would make changes in the component of solution, therefor lead to change the conductivity. According to the response of conductivity it reflect the numbers and the growth of microbes obviously. In this experiment of microbial growth by our home-made SPQC system. We found the fact that the frequency began to change obviously within two hours while the initial number of microbe was 10^7 could rapidly reflect the number of unknown solution. It could be achieved by a series of system handling in the future.