THERMOELECTRIC BASED TEMPERATURE CONTROL BOX FOR QCM SENSOR MEASUREMENT CELL
Keywords:
Thermoelectric, temperature control, temperature distribution, QCM measurementAbstract
The QCM sensor has a sensitivity to the viscosity and density change of the liquid in contact with the sensor. As the viscosity and density of a liquid are usually temperature dependent, temperature stability of the liquid is an important point in the QCM measurement related to the liquid viscosity and density. In an application, the temperature needs to be maintained constant along with the measurement process. In the impedance-based measurement of the QCM sensor in contact with liquid, the temperature needs to be maintained in its constant value during the measurement process. A circulating water bath was commonly used. The disadvantages of the system were high energy consumption and slow response. In this work, the thermoelectric element was used to maintain the temperature of the sensor and the liquid being measured. Three thermoelectric modules were used and independently controlled to provide a temperature profile to the QCM sensor module. The chamber temperature was measured using a thermistor to be used as a feedback signal to control the thermoelectric current. The measurement showed that the temperature of the thermoelectric surface was inhomogeneous. Small temperature variation on the surface was observed. However, the results showed that the temperature stability of the QCM sensor chamber and liquid could be maintained with 0.2oC stability. Temperature control was done by controlling the pulsed DC current to the thermoelectric. This method allows the temperature change of the liquid sample on top of the QCM sensor by 5oC/min at still air.
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