| 摘要 |
PURPOSE: A pH measurement system using a glass pH sensor is provided to reduce the time constant of a measurement system and to calculate the inner resistance and power corresponding to the equivalent circuit of a glass pH sensor. CONSTITUTION: A pH measurement system(100) using a glass pH sensor comprises a power supply unit(110), a detecting unit(130-136) and a calculation unit(140). The power supply unit applies voltage to the glass pH sensor. The voltage has a resistance 10 times or more smaller than the equivalent inner resistance of the glass pH sensor. The detecting unit detects the output voltage of the glass pH sensor. The calculation unit calculates the pH value of the solution based on the detected output voltage. The detecting unit comprises an operational amplifier and a feedback capacitor.
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