Capacitive sensor for quantity detection of known liquid present in distilled water

In this paper the possibility of detection presents of various liquids in distilled water by employing the interdigital capacitor was investigated. Quantity detection principle of known liquid in distilled water is based on immerging the interdigital capacitor in distilled water and observing changes of its capacity with quantity increment of known liquid. Experimental measurement were done with interdigital capacitor fabricated in LTCC technology immerged in distillated water with various quantity of known liquids. Good results were achieved. It was concluded that it is possible to detect changes of 0.1 ml of known liquid in 100 ml of distilled water.