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Capacitance probe, or fringe capacitance sensor.Capacitance probes use capacitance to measure the dielectric permittivity of the soil. The volume of water in the total volume of soil most heavily influences the dielectric permittivity of the soil because the dielectric constant of water (80) is much greater than the other constituents of the soil (mineral soil: 4, organic matter: 4, air: 1).
The configuration is like the neutron probe where an access tube made of PVC is installed in the soil; probes can also be modular (comb-like) and connected to a logger. The sensing head consists of an oscillator circuit, the frequency is determined by an annular electrode, fringe-effect capacitor, and the dielectric constant of the soil. Each ...
Electronic tensiometer probe: (1) porous cup; (2) water-filled tube; (3) sensor-head; (4) pressure sensor. A tensiometer in soil science is a measuring instrument used to determine the matric water potential (soil moisture tension) in the vadose zone.
The Chang'e-6 probe used a scoop and drill to obtain about 4-1/4 pounds (1,935 grams) of soil. It then returned the material to Earth, landing in the Chinese region of Inner Mongolia.
SINGAPORE (Reuters) -China landed an uncrewed spacecraft on the far side of the moon on Sunday, a landmark mission aiming to retrieve the world's first rock and soil samples from the dark lunar ...
A TDR waveguide with exposed wires. In the waveform analysis a sensor (usually a probe) is placed in the material to be tested. The sensor contains a waveguide consisting of two, three, or more parallel wires which is connected via a coaxial cable to a voltage pulse generator which sends precisely defined voltage pulses into the sensor.
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