Device for measuring moisture content of soil and snow water sto

Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means

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2503581, G01N 2309

Patent

active

049926675

ABSTRACT:
A device for measuring moisture content of soil and snow water storage has a first detector of cosmic neutrons passed through the soil placed deep in the soil at a pre-set depth, a second cosmic-ray neutron detector placed above the soil at an altitude which is greater than maximum snow pack thickness or vegetation layer height and spaced from the first neutron detector at a distance which is not greater than the path length of thermal neutrons in the atomosphere, and a soil background gamma-quantum radiation detector placed on the soil surface and spaced from the first neutron detector at a distance which is not greater than the gamma-quantum path length in the soil. Outputs of the neutron detectors and gamma-quantum radiation detector, are coupled to a respective series circuit, including a unit for detecting pulses of a predetermined amplitude, a pulse counter to which is connected a timer, and a recorder.

REFERENCES:
patent: 4047042 (1977-09-01), Wada et al.
A. V. Dmitriev, Sh. D. Friedman. Fundamentals of Remote Methods for Measuring Snow Water Storage and Moisture Content of Soils, 1979, Gidrometeoizat Pub., Leningrad, pp. 281, 288.
E. V. Kolomeets, Sh. D. Fridman, Method for Determining Snow Water Storage and Soil Moisture, 1981, Gidrometeoizdat Pub., Leningrad, p. 3.

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