Apparatus for measurement of soil moisture content

Details Apparatus for measurement of soil moisture content Apparatus for measurement of soil moisture content

1978-12-26

1981-05-12

Corbin, John K.

Optics: measuring and testing

By shade or color

With color transmitting filter

250255, 250339, 356 51, G01J 338, G01N 2135

Patent

active

042668786

ABSTRACT:
An apparatus for measuring the moisture content of a soil sample at selected depths is disclosed. Light is conducted from a source via a fiber optical cable to a soil probe which is inserted at selected depths into a bore hole formed in the soil sample. Light from the source and reflected light from the soil sample is conducted via fiber optic cables to a reflectometer, which determines reflection factors of the soil sample at three selected infrared wavelengths of a water absorption band. Means are provided to compute the moisture content of the sample at the selected depths from the measured reflectance factors.

REFERENCES:
patent: 3814081 (1974-06-01), Mori
patent: 3890049 (1975-06-01), Collins et al.
patent: 3901220 (1975-08-01), Koyasu et al.
patent: 3910701 (1975-10-01), Henderson et al.
patent: 3940608 (1976-02-01), Kissinger et al.
Auer, Siegfried, "Soil Moisture Evaporation Experiments in a Controlled Environment", NASA Final Report under Contract NAS 5-23882, dated Sep. 30, 1977.

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