Pengaruh Jumlah Elektroda Sensor Kapasitif terhadap Sensitivitas Pengukuran Kadar Air Tanah

Abstract

Telah dilakukan desain, pembuatan dan karakterisasi sensitivitas sensor kapasitif. Sensitivitas sensor merupakan parameter penting yang harus diperhatikan dalam pengukuran. Besarnya sensitivitas ditentukan berdasarkan perbandingan sinyal keluaran terhadap masukan sensor kapasitif. Masukan sensor kapasitif yang dimaksud adalah kadar air tanah. Penelitian ini memfokuskan pengaruh jumlah elektroda sensor kapasitif terhadap sensitivitas pengukuran kadar air tanah. Tahapan penelitian diawali desain sensor kapasitif dengan variasi jumlah elektroda, kemudian layout sensor kapasitif dicetak dalam PCB. Selanjutnya mempersiapkan sampel tanah dengan kadar air yang telah diukur. Pengujian dilakukan dengan mengukur nilai kapasitansi sensor untuk setiap variasi kadar air dan jumlah elektroda. Jumlah periodik elektroda yang divariasi adalah N= 50, 100, 150, 200, 250 dan 300. Hasil pengujian sensitivitas sensor kapasitif untuk jumlah periodik elektroda N= 50, 100, 150, 200, 250 dan 300 masing masing menunjukkan 2,023pF/%; 3,773 pF/%; 5,154 pF/%; 5,768 pF/%; 6,112 pF/%; 6,341pF/% kadar air.

Design, manufacture and characterization of sensitivity of capacitive sensors have been carried out. Sensitivity of the sensor is an important parameter that must be considered in the measurement. The amount of sensitivity is determined based on the comparison of the output signal to the capacitive sensor input. The capacitive sensor input in question is the soil water content. This study focuses on the effect of the number of capacitive sensor electrodes on the sensitivity of measuring soil water content. The research phase begins with the design of capacitive sensors with variations in the number of electrodes, then the capacitive sensor layout is printed in the PCB. Next, prepare soil samples with measured water content. Testing is done by measuring the sensor capacitance value for each variation in water content and number of electrodes. The periodic number of electrodes varied were N = 50, 100, 150, 200, 250 and 300. The results of testing the sensitivity of the capacitive sensors for the periodic number of electrodes N = 50, 100, 150, 200, 250 and 300 each showed 2.023pF/%; 3.773 pF/%; 5.154 pF/%; 5.768 pF/%; 6.112 pF /%; 6.341pF /% moisture content.