| 초록 |
Quartz crystal resonators coated with PVA are utilized to determine water contents in ethanol. The PVA is easily dissolved in water, but is insoluble to ethanol. When the PVA coated quartz crystal resonator is dipped in the ethanol containing small amount of water, the water is absorbed in the PVA increasing the load on the PVA coating to result in frequency drop. The determination performance of PVA coated resonator is examined by measuring frequency decreases in 2 % to 10 % water contained ethanol. The measurements indicates that the higher water content is the more the frequency reduction is, though some variation in the measurement is observed. The blank test using the bare QCR yields the insignificant drop of frequency.
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