Soil moisture measuring instrument and its measuring method

Abstract

The invention relates to a soil moisture content tester and a testing method thereof. The soil moisture content tester comprises a main engine, a probe, a WIFI module and a hand-held terminal module, the main engine comprises a central processing unit, a signal transmitting-receiving system, a central digital signal processing unit and a connector. The testing method includes that combining an adjustable multi-frequency point signal source with a vector receiving technology, measuring electromagnetic wave transmission characteristics, converting acquired information into distance domain through arithmetical operation, and obtaining the dielectric constant and moisture content of the soil around parallel transmission lines through data analysis and inversion. The soil moisture content testing for various non-specific types of soil does not need advanced calibration, the speed is fast, the precision is high, the practicability is strong, the repeatability is high, and any influence on the tested soil is avoided. The hand-held terminal module can store a lot of data and images, and the hand-held terminal module supports data playback and comparison functions, supports WIFI, GPRS and GPS or Beidou system function and realizes the spot real-time display, storage, remote sharing, reprocessing and precise positioning of measured data.

Description

technical field [0001] The invention belongs to the field of soil moisture monitoring, and relates to a soil moisture measuring instrument and a measuring method thereof, and is especially suitable for measuring large-area soil moisture and performing real-time monitoring. Background technique [0002] There are many methods for measuring soil moisture. At present, the existing technologies in the market include drying method, neutron attenuation method, tensiometer method, near infrared method, frequency domain reflection, standing wave ratio method and time domain reflection method. The drying method is a classic method for measuring soil moisture content, but the drying method cannot realize online monitoring. It must be taken back to the laboratory for drying and weighing. And the measurement period is long. The neutron attenuation method uses neutron attenuation. If the shielding is not good, it is easy to cause radiation leakage, pollute the environment, and endanger...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a soil moisture measuring instrument and its measuring method. The measurement method adopts the combination of broadband signal transmission technology and vector receiving technology, which solves the problems of small frequency range, low frequency, slow measurement speed, calibration before measurement, large influence by external environment such as soil quality and soil type, practicability and repeatability, and Issues such as poor versatility

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