Electronic tensiometer for measuring the matric potential in porous media

摘要

"Electronic tensiometer for measuring the matric potential in porous media.Consisting of an electronic system and hydraulic pressure differential is composed of a sensor, a temperature sensor, resistors and capacitors, diode and a power supply.These devices are connected together in an electronic circuit board (3).The hydraulic device is composed of a rigid PVC pipe (7), a micro capsule (9) and a porous ceramic (2).The pressure sensor of the differential type connects a side directly to the atmosphere; while the opposite side connects to a micro porous and hence the capsule for measuring the tension with which the water isRetained in the soil or other medium added.The temperature sensor (12) aims to remove the effect of temperature on the physical properties of the water and the electronic system to produce a response that depends only on the voltage of theThe water in the soil.The sensors generate analog temperature and pressure responses are converted into the digital form through a system of data acquisition and control.Made by digital analog converter (14), the microcontroller (15), memory (16), (17) and a serial output display (18).