Method for determining soil moisture on basis of thermal pulse

A technology of soil moisture and heat pulse, applied in the direction of material moisture content, material thermal conductivity, preparation of test samples, etc., can solve troublesome, medium-influenced, complex problems, etc.

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A technology of soil moisture and heat pulse, applied in the direction of material moisture content, material thermal conductivity, preparation of test samples, etc., can solve troublesome, medium-influenced, complex problems, etc.

CN101598690AInactive Publication Date: 2009-12-09BEIJING NORMAL UNIVERSITY

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[0020] The present invention is a kind of soil moisture measurement method based on heat pulse, comprises nine steps, as figure 1 shown. Let’s take the soil in Tongzhou, Beijing as an example. The soil type is sandy loam. The water content of the air-dried soil is 0.08, and the water content of the saturated soil is 0.288. The soil bulk density is 1.40g / cm 3 , the steps of this method are described in detail below:

[0021] Step 1. Soil sample preparation: select about 200 kg of soil samples in the field to be tested, air-dry the soil samples indoors, then pass through a sieve with an aperture of 1 mm, and put the sieved air-dried soil samples in a storage container;

[0022] Step 2. Determination of water content of air-dried soil samples: Take 30.00 g of air-dried soil samples from the container described in Step 1, place them in an oven, and dry them at 105°C for about 24 hours until the weight of the soil remains unchanged. The weight is 27.78g, and then calculate the wa...

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Abstract

The invention discloses a method for determining soil moisture on the basis of thermal pulse. The method comprises the following steps: Step 1, preparing a soil sample; Step 2, determining the moisture content of the air-dried soil sample; Step 3, preparing a calibration soil sample; Step 4, calculating the weight of dry soil in each cylinder; Step 5, mounting a soil moisture sensor; Step 6, confirming the thermal diffusion time corresponding to the moisture content of the calibration soil sample which is not watered; Step 7, confirming the thermal diffusion time corresponding to different moisture contents of the watered calibration soil sample; Step 8, fitting the function relation between the moisture content of the calibration soil sample and the thermal diffusion time; Step 9, determining the soil moisture of the field to be determined. The method of the invention for determining the soil moisture on the basis of thermal pulse has the advantages of simple principle, high accuracy, easy operation and small destroy; the method with the function of continuous multipoint positioning or mobile determination is not subject to the internal media of the soil, therefore, the application range is wide; the method is free from electromagnetic radiation, thereby causing no harm to human bodies.

Description

technical field [0001] The invention is a method for measuring soil water content by heat pulse and heat diffusion principle. Background technique [0002] Soil moisture content is one of the basic data needed for scientific research in agricultural water and soil engineering, irrigation and drainage science, crop cultivation, hydrology, soil science and many other disciplines. Therefore, accurate determination of soil water content is of great significance for research in the above-mentioned fields and related fields. The existing soil water content measurement methods are mainly two methods of electromagnetic wave and electromagnetic radiation. These two methods are relatively complicated, greatly affected by the internal medium of the soil, and have large measurement errors. The damage to the soil is relatively large, and manual on-site operation is required when measuring, which is time-consuming, labor-intensive, and labor-intensive, which is very troublesome. The str...

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Application Information

Patent Timeline

09 Dec 2009

Publication

CN101598690A

IPC: G01N25/56; G01N25/18; G01N1/28; G01N5/04

Inventors: 刘海军