Soil moisture content ultrasonic measuring device and method

Abstract

The invention discloses a soil moisture content ultrasonic measuring device and method. The method comprises the following steps: measuring the soil moisture content theta through a moisture content probe; calculating the propagation velocity V[soil] of ultrasonic waves under the soil moisture content; repeating the operation multiple times, and establishing a database; placing a measuring device on to-be-measured soil; recording the time t1 when a second ultrasonic receiver receives a signal, and calculating the ultrasonic propagation speed V1 of the position; moving a sliding block downwards by delta h; recording the time t2 when the second ultrasonic receiver receives the signal; calculating the time t2 when the second ultrasonic receiver receives the signal, and judging whether the t2 is equal to the recorded time t2 record or not; recording the thickness and the moisture content of the layer in a background; and measuring according to the operation to obtain the moisture content and the thickness of each layer of soil, and constructing a change curve. According to the invention, the change curve of the soil moisture content in the soil depth direction can be obtained, and probe rusting and corrosion are avoided.

Description

technical field [0001] The invention relates to a soil moisture content measurement device and method, in particular to an ultrasonic measurement device and measurement method for soil moisture content. Background technique [0002] Soil moisture content is an indicator of soil moisture. Accurate measurement of soil moisture content plays a vital role in the growth of vegetation. In actual production operations, the probe of the humidity sensor is buried in the soil for the growth of crops and directly contacts with the soil in order to directly obtain real data. The probe buried in the soil is connected to the external sensor body through the data line to transmit in real time humidity information. [0003] Furthermore, when the probe is inserted into the soil and is in contact with the soil for a long time, it is easy to oxidize with the air, moisture and trace elements in the soil, which will lead to rust and corrosion, making the measured data inaccurate and affecting t...

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Problems solved by technology

[0003] Furthermore, when the probe is inserted into the soil and is in contact with the soil for a long time, it is easy to oxidize with the air, moisture and trace elements in the soil, which will lead to rust and corrosion, making the measured data inaccurate and affecting the probe’s performance. precision

Moreover, the existing methods and probes for measuring moisture content can only measure one point or a small range of moisture content, and cannot measure the change of moisture content along the soil depth, resulting in the inability to accurately irrigate, which has a negative impact on vegetation growth. great influence

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