Portable soil water content ultrasonic testing device and testing method

Abstract

The invention discloses a portable soil water content ultrasonic testing device and a testing method. The device comprises a detection probe and a height-adjustable bracket, wherein the height-adjustable bracket comprises a screw rod, an optical axis guide rail, a square hole array oblique inserted metal plate, a horizontal base, a spring snap joint and a support platform; the detection probe is arranged on a slide block; the slide block is arranged on the support platform; the detection probe is capable of horizontally moving along the support platform; the horizontal base and the square hole array oblique inserted metal plate are formed into a fixed inclined angle and are connected with each other through the spring snap joint; the spring snap joint is matched with a square hole of the oblique inserted metal plate and is used for adjusting the depth of the oblique inserted metal plate inserted into the soil; and a temperature sensor is arranged on the oblique inserted metal plate. The portable soil water content ultrasonic testing device utilizes double parameters, namely, sound velocity and echo amplitude, to measure the water content of the soil, has the characteristics of high repeatability and complementary calibration, is low in cost and is high in precision.

Description

Technical field [0001] The invention relates to the field of soil moisture detection, in particular to a portable ultrasonic detection device and detection method for soil moisture. Background technique [0002] Soil moisture is the basic condition of crop growth and development and an important parameter in yield forecasting models. It is also an important indicator for agricultural drought and crop drought. Therefore, soil moisture is a frequently measured item in water-saving agriculture research. At present, the methods for measuring soil moisture content mainly include drying weighing method, ray method, time domain reflection method, remote sensing method, etc. The drying weighing method has high accuracy, but the sampling speed is slow and requires a lot of manpower and material resources. The radiation method has potential radiation hazards, and it is difficult to meet the application requirements of detecting soil moisture in actual production. Time domain reflectometr...

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Problems solved by technology

The ray method has potential radiation hazards, and it is difficult to meet the application requirements of soil moisture detection in actual production

The time domain reflectometry is to indirectly determine the soil moisture content by measuring the soil dielectric constant. This method is low in cost, but the error is large, and the salinity will affect the soil dielectric constant, so it cannot be applied to all soil samples.

The principle of remote sensing method is to measure the electromagnetic radiation energy emitted or reflected by the soil surface, which is suitable for large-area and multi-temporal soil moisture monitoring, but this method is expensive and has large measurement errors, and the current maximum detection depth is only 0.05m, which is limited. more sex

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