영신컨설턴트 (02) 529 8803 ystcha@naver.com 2021 5
부 간극수압
ceramic tip (tensiometer) 부간극수압 측정
Reading instantaneous profiles of soil water capillary pressure, moisture and salinity from arrays of the LP/p and LP/ms miniprobes
Features of LP/p probes:
Sensor:
o pressure diaphragm: a 15 mm long ceramic cup, 3 mm in diameter,
o pressure transducer: an integrated, fully active Wheatstone bridge with four piezoresistive strain gauge resistors diffused into a silicon diaphragm,
o air entry pressure: about 900 mbar (= 900cm=9m H2O),
offset drift: ± 20 mbar/month,
relative error: ± 15 %,
resolution: 1 mbar,
delay: 0 to 800 mbar in about 120 s, 800 to 0 mbar in about 3 s,
cable length: 2 m,
installation hole: 8 mm diameter,
tapped with 8x1 mm thread.
1mbar =1cm H2O = 0.001bar = 0.0102m H2O 1BAR =10.2 m H2O
66mbar = 66 x 0.0102 m H2O = 0.066m =60cm
설치 방법
실내시험 용 15 mm long ceramic cup, 3 mm in diameter
LP/p - laboratory probe for pressure of the soil capillary water
pressure diaphragm: a 15 mm long ceramic cup, 3 mm in diameter
air entry pressure: about 900 mbar
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