CN204903528U - Soil physics multi -parameter sensor - Google Patents

Abstract

The utility model discloses a soil physical multi-parameter sensor, which comprises a sensor protection shell, a data acquisition control device and a sensor connected to the data acquisition control device are arranged in the sensor protection shell, and the data acquisition control device includes A solar cell, the solar cell is connected with a charge and discharge management circuit, the charge and discharge management circuit is respectively connected with a lithium battery and a single-chip microcomputer, the single-chip microcomputer is connected with a ZIgbee wireless transceiver, and the sensor includes a the probe circuit on which the PCB is connected? Board, PCB? The middle stainless steel pipe and several peripheral stainless steel pipes are arranged on the board. Beneficial effects of the utility model: it can simultaneously measure important physical parameters such as soil water content, heat capacity, thermal conductivity, evaporation, and soil water saturation at the same measured point, with high measurement accuracy, fast data transmission speed, and convenient use and maintenance. , low cost and broad application prospects.

Description

A soil physical multi-parameter sensor

technical field

The utility model relates to the technical field of design and application of soil physical parameter acquisition sensors, in particular to a soil physical multi-parameter sensor.

Background technique

For a long time, many devices and techniques have been used to measure different physical parameters of soil. These techniques can only measure one or two kinds of soil physical parameters, and it is difficult to analyze the information of multiple physical parameters on the same point of soil, because the prior measurement of any physical parameter will disturb the soil at that point and cause subsequent Interference with row data measurement conditions. Strict data comparison cannot be carried out if the measurement is near this point, which brings difficulties to the measurement of soil physical parameters, and some measurement techniques use laboratory methods after soil sampling. Soil sampling will not only disturb the soil, but also cannot realize the measurement data. At the same time, the existing soil physical parameter detection sensors are powered by DC power supply or batteries, which requires the arrangement of power lines for each sensor or regular battery replacement, resulting in high construction and maintenance costs.

Aiming at the problems described in the above-mentioned related technologies, no effective solution has been proposed yet.

Utility model content

Aiming at the above-mentioned problems in the related art, the utility model proposes a soil physical multi-parameter sensor, which can use solar energy to supply power to monitor important physical parameters such as soil water content, heat capacity, thermal conductivity, evaporation, and soil water saturation at the same measured point. Simultaneous measurement and wireless transmission of test results at the same time, stable and reliable work, high measurement accuracy, high data transmission efficiency, and no need to replace batteries regularly.

For realizing above-mentioned technical purpose, technical scheme of the present utility model is realized like this:

A soil physical multi-parameter sensor, comprising a sensor protection case, a data acquisition control device and a sensor connected to the data acquisition control device are arranged in the sensor protection case, the data acquisition control device includes a solar cell, the The solar cell is connected with a charging and discharging management circuit, and the charging and discharging management circuit is respectively connected with a lithium battery and a single-chip microcomputer, and the single-chip microcomputer is connected with a ZIgbee wireless transceiver device, and the sensor includes a probe circuit connected with the single-chip microcomputer, so The probe circuit is connected with a PCB board, and the PCB board is provided with an intermediate stainless steel pipe and several peripheral stainless steel pipes, wherein an epoxy resin gasket is provided between the PCB board and the intermediate stainless steel pipe, and the Thermocouples and heating wires are embedded in the middle stainless steel tube, and thermocouples are embedded in the surrounding stainless steel tubes.

Further, the protective shell of the sensor is a cylinder.

Further, the number of the surrounding stainless steel pipes is three.

Further, the radius of the intermediate stainless steel tube is 0.8 mm, the radius of the peripheral stainless steel tube is 0.7 mm, and the peripheral stainless steel tubes are evenly arranged on a circle with a radius of 7 mm centered on the intermediate stainless steel tube .

Further, the heating wire fills the entire length of the middle stainless steel tube, and the end of the thermocouple is arranged at a middle position between the middle stainless steel tube and the peripheral stainless steel tube.

The beneficial effects of the utility model:

1. It can simultaneously measure important physical parameters such as soil water content, heat capacity, thermal conductivity, evaporation, and soil water saturation at the same measured point. At the same time, due to the use of the dispersion frequency method for soil water content measurement, it can effectively reduce The soil moisture content measurement interference caused by factors such as soil temperature and salinity broadens the scope of use of the sensor and improves the measurement accuracy of soil moisture content;

2. The sensor head uses a specially designed PCB board, which effectively solves the connection and matching between the probe circuit and the probe, reduces the microwave reflection value, improves the measurement accuracy, and is also conducive to the maintenance of the sensor and the replacement of the probe;

3. Integrating short-distance wireless communication technology, solar battery and charge and discharge management technologies, it can realize wireless transmission of test results, so it can save a lot of communication cables, and does not need to replace batteries regularly, which can greatly save costs and has a wider range of applications. Application prospect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a schematic structural diagram of a soil physics multi-parameter sensor according to an embodiment of the present invention.

In the picture:

1. Sensor protective case; 2. Data acquisition control device; 3. Sensor; 4. Solar battery; 5. Charge and discharge management circuit; 6. Lithium battery; 7. Single-chip microcomputer; 8. ZIgbee wireless transceiver device; 9. Probe circuit; 10. PCB board; 11. Intermediate stainless steel tube; 12. Surrounding stainless steel tube; 13. Epoxy resin gasket; 14. Thermocouple; 15. Heating wire.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

As shown in Figure 1, a soil physical multi-parameter sensor according to an embodiment of the present invention includes a sensor protection shell 1, a data acquisition control device 2 is arranged in the sensor protection shell 1 and a data acquisition control device 2 connected to the data The sensor 3 on the acquisition control device 2, the data acquisition control device 2 includes a solar battery 4, the solar battery 4 is connected with a charge and discharge management circuit 5, and the charge and discharge management circuit 5 is respectively connected with a lithium battery 6 and a Single-chip microcomputer 7, is connected with ZIgbee wireless transceiver 8 on the single-chip microcomputer 7, and described sensor 3 comprises the probe circuit 9 that links to each other with described single-chip microcomputer 7, is connected with PCB board 10 on the described probe circuit 9, on the described PCB board 10 An intermediate stainless steel pipe 11 and several peripheral stainless steel pipes 12 are provided, wherein an epoxy resin gasket 13 is arranged between the PCB board 10 and the intermediate stainless steel pipe 11, and a thermoelectric couple 14 and heating wire 15, and thermocouples 14 are embedded in the surrounding stainless steel pipe 12.

In one embodiment, the sensor protection case 1 is a cylinder.

In one embodiment, the number of the peripheral stainless steel pipes 12 is three.

In one embodiment, the radius of the intermediate stainless steel pipe 11 is 0.8mm, the radius of the peripheral stainless steel pipe 12 is 0.7mm, and the peripheral stainless steel pipe 12 is evenly arranged on the center of the circle with the intermediate stainless steel pipe 11 on a circle of radius 7mm.

In one embodiment, the heating wire 15 fills the entire length of the middle stainless steel tube 11 , and the end of the thermocouple 14 is set at a middle position between the middle stainless steel tube 11 and the peripheral stainless steel tube 12 .

In order to facilitate the understanding of the above-mentioned technical solution of the present utility model, the above-mentioned technical solution of the present utility model will be described in detail below through specific usage modes.

In specific use, the heating wire is powered by a heat source and a constant current source, and the whole system is powered by a system stabilized voltage source. The middle stainless steel pipe 11 is insulated from the PCB board 10 with an epoxy resin spacer 13 , and plays a role of fixing the middle stainless steel pipe 11 . The scanning frequency is generated by the probe circuit 9, and the probe circuit 9 measures the dispersion frequency of the sample formed by the sensor 3 and the soil, and the soil moisture content is calculated from the dispersion frequency. The dispersion frequency is only related to the soil water content, and the soil salinity and temperature have little influence on the measurement of soil water content, which effectively solves the shortcomings of small measurement range and poor measurement accuracy of low-humidity soil when using fixed frequency sensors. The soil thermal parameter measurement part is composed of the heating wire 15 and the thermocouple 14, thereby measuring the change of the soil temperature, and performing automatic calculation of the heat capacity, thermal conductivity and water evaporation value based on this, and the soil heat capacity and water content can also be calculated. Estimate the soil bulk density, and obtain the equivalent value of air hole and soil saturation, so as to realize the soil temperature, volume water content, soil dielectric constant, heat capacity, thermal conductivity, evaporation, soil water, etc. Saturation, soil porosity "same point", multi-parameter, on-site, automatic measurement.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (5)

1. A multi-parameter sensor for soil physics, comprising a sensor protection case (1), characterized in that a data acquisition control device (2) is arranged in the sensor protection case (1) and is connected to the data acquisition control device ( 2) on the sensor (3), the data acquisition control device (2) includes a solar cell (4), the solar cell (4) is connected to a charging and discharging management circuit (5), and the charging and discharging management circuit ( 5) are respectively connected with a lithium battery (6) and a single-chip microcomputer (7), the single-chip microcomputer (7) is connected with a ZIgbee wireless transceiver (8), and the sensor (3) includes a sensor connected to the single-chip microcomputer (7). A probe circuit (9), the probe circuit (9) is connected with a PCB board (10), and the PCB board (10) is provided with an intermediate stainless steel tube (11) and several peripheral stainless steel tubes (12), wherein, the An epoxy resin gasket (13) is arranged between the PCB board (10) and the middle stainless steel pipe (11), and a thermocouple (14) and a heating wire ( 15), the surrounding stainless steel tubes (12) are embedded with thermocouples (14). 2. The soil physics multi-parameter sensor according to claim 1, characterized in that the sensor protection shell (1) is a cylinder. 3. The multi-parameter sensor for soil physics according to claim 1, characterized in that the number of said peripheral stainless steel pipes (12) is three. 4. The soil physics multi-parameter sensor according to claim 3, characterized in that, the radius of the middle stainless steel tube (11) is 0.8 mm, the radius of the peripheral stainless steel tube (12) is 0.7 mm, and the The surrounding stainless steel pipes (12) are evenly arranged on a circle with a radius of 7mm centered on the middle stainless steel pipe (11). 5. The soil physics multi-parameter sensor according to claim 4, characterized in that, the heating wire (15) fills the entire length of the middle stainless steel tube (11), and the end of the thermocouple (14) is set on the The middle stainless steel pipe (11) and the middle position of the peripheral stainless steel pipe (12).