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根据两面电极浸入液体中的压电晶体等效电路模型和Pierce振荡器振荡方程的解,得到晶体在电解质溶液中的振荡频率(F_1)与溶液电导率(x)的关系式:F_1=(1/2π)(1/C_1+1/C_2)(1/X_e)[(R_e~2+X_e~2)x~2+2R_ex+1]。以自行设计的Pierce晶体振荡器。研究了晶体和主振电路参数、输入电压及检测池外壳屏蔽接地对AT切9MHz石英晶体在KCl、Na_2SO_4水溶液中的频率、相对于纯水频移随溶液电导率变化的影响规律,结果与上式相符。
The relationship between the oscillation frequency (F_1) and the solution conductivity (x) of the crystal in the electrolyte solution is obtained according to the piezoelectric crystal equivalent circuit model and the Pierce oscillator oscillation equation when the two electrodes are immersed in the liquid. F_1 = (1 / 2π) (1 / C_1 + 1 / C_2) (1 / X_e) [(R_e ~ 2 + X_e ~ 2) x ~ 2 + 2R_ex + 1]. To design their own Pierce crystal oscillator. The influence of crystal and main oscillator circuit parameters, input voltage and shield grounding of test cell shell on the frequency of AT cut 9MHz quartz crystal in KCl and Na_2SO_4 aqueous solution was studied. Matching.