CN112858222A - Visible light and near infrared soil moisture content sensor for detecting soil moisture content - Google Patents
Visible light and near infrared soil moisture content sensor for detecting soil moisture content Download PDFInfo
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- CN112858222A CN112858222A CN202110099036.XA CN202110099036A CN112858222A CN 112858222 A CN112858222 A CN 112858222A CN 202110099036 A CN202110099036 A CN 202110099036A CN 112858222 A CN112858222 A CN 112858222A
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- 239000002689 soil Substances 0.000 title claims abstract description 86
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims abstract description 17
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 17
- 239000010980 sapphire Substances 0.000 claims abstract description 17
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 6
- 238000007790 scraping Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000009434 installation Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C5/00—Making or covering furrows or holes for sowing, planting or manuring
- A01C5/06—Machines for making or covering drills or furrows for sowing or planting
- A01C5/062—Devices for making drills or furrows
- A01C5/064—Devices for making drills or furrows with rotating tools
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C7/00—Sowing
- A01C7/20—Parts of seeders for conducting and depositing seed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
- G01J2003/102—Plural sources
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J2003/425—Reflectance
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a visible light and near-infrared soil moisture content sensor for detecting soil moisture content, and belongs to the technical field of agricultural sensors. The soil moisture content sensor comprises an upper shell, a lower shell, a connecting screw, a connecting concave plate, a connecting bolt, an M-shaped fixing frame, a visible light source, a near-infrared light source, a light source driver, a sapphire wafer, an InGaAs photoelectric sensor, a signal amplification module, a storage and recording module, an analog-to-digital converter and a single chip microcomputer, and is arranged between double-disc furrow openers of a seeder, used for detecting the soil moisture content at the bottom of a furrow opened by the seeder and acquiring the moisture content of soil in real time. The seeder does not need to be modified. The light source or the photoelectric sensor is convenient to disassemble, assemble and replace. The visible light and near infrared combined light source meets the requirements of no contact and quick response while obtaining the water content of the soil, and the sensor has the advantages of small size, small volume, simple installation and convenient disassembly.
Description
Technical Field
The invention belongs to the technical field of agricultural sensors, and particularly relates to a visible light and near-infrared soil moisture content sensor for detecting soil moisture content.
Background
Accurate agriculture is the inevitable trend of modern agriculture development, and timely and accurate agricultural condition information acquisition is the prerequisite of accurate operation of agricultural machinery, and this step is realized through sensor technology usually. The water is one of the most basic requirements of crop growth, and not only directly influences the crop growth, but also indirectly influences the crop growth conditions and the soil environment. The real-time acquisition of the soil water content can provide a data base for operations such as seeding, fertilizing, harvesting and the like of agricultural implements, and corresponding adjustment is carried out in real time through the acquired data so as to achieve the most suitable water condition and make full use of soil resources. The field water content distribution map can be quickly acquired by acquiring the soil water content in real time, single-point acquisition through a static water sensor is avoided, and the labor intensity for acquiring field water content information can be greatly reduced.
The method for measuring the water content by the visible light-near infrared reflection method has the advantages of being high in speed, non-contact, high in repeatability and the like, the water content of the soil is determined by selecting the light sources of the appropriate visible light wave band and the appropriate near infrared wave band and integrating the reflectivity of the two kinds of soil to the two kinds of light, rapid and nondestructive water content detection can be achieved, the vehicle-mounted real-time detection requirement is met, and meanwhile the purposes of being small in size and low in cost can be achieved.
At present, the development of real-time soil moisture sensors by using visible light near infrared is developed to a certain extent abroad, but the problems of high price of a spectrometer, easy damage of a vehicle-mounted spectrometer, high cost due to the fact that a long-wave band near infrared light source is completely adopted and the like exist, and the popularization of the sensors is limited. Domestic development is limited to in-situ measurement of soil moisture, and visible light near infrared measurement of soil moisture has certain research, but reports are provided for real-time dynamic acquisition of soil moisture content.
The visible light and near infrared combined light source meets the requirements of no contact and quick response while obtaining the water content of the soil, and the cost is reduced by adopting the visible light source. The InGaAs photoelectric sensor has the advantages of high sensitivity and quick response when receiving reflected light. The bottom of the sensor adopts a sapphire wafer, so that the photoelectric sensor can be better ensured to receive reflected light, and the parallelism of light beams is improved. The sensor is installed on the U-shaped block through the bolt, so that the installation is simple and the disassembly is convenient. The bottom of the sensor is tightly attached to the bottom of the ditch, the front part of the sensor is designed into an arc shape, the tail part of the sensor is designed into a wedge shape and is close to the tail end of the seed guide pipe, the function of scraping the bottom of the ditch is achieved, and the falling of seeds is more stable. The sensor is small in size and small in size, and a seeder does not need to be improved. The sensor shell consists of a lower shell and an upper shell which are connected by screws, and the light source or the photoelectric sensor is convenient to disassemble, assemble and replace.
Disclosure of Invention
The invention aims to provide a visible light and near-infrared soil moisture content sensor for detecting the moisture content of soil, which comprises the following components: the soil moisture content sensor is arranged between double-disc furrow openers of the seeder and is used for detecting the soil moisture content of the bottom of a furrow opened by the seeder; the soil moisture content sensor is characterized by comprising an upper shell 101, an arc surface connecting screw 102, a side surface connecting screw 103, a lower shell 104, a connecting concave plate 105, a connecting bolt 106, an M-shaped fixing frame 107, a visible light source 108, a sapphire wafer 109, an InGaAs photoelectric sensor 110, a near infrared light source 111, a light source driver 112, a signal amplification module 113, a storage and recording module 114, an analog-to-digital converter 115 and a single chip microcomputer 116; the upper shell 101 and the lower shell 104 are attached through matching notches of the upper shell and the lower shell, and are tightly connected with the bottom cambered surface connecting screw 102 through side connecting screws 103 which are symmetrically arranged on two sides; the threaded holes on the two side surfaces of the connecting concave plate 105 are connected with the upper shell 101 through side connecting screws 103; the bottom surface of the connecting concave plate 105 is fixed with an M-shaped fixing frame 107 through a connecting bolt 106; the visible light source 108 and the near-infrared light source 111 are symmetrically arranged on two inclined planes of the M-shaped fixing frame 107 at an angle of 45 degrees; the light emitted by the two light sources is converged at the bottom surface of the lower shell 104, and a sapphire wafer 109 is arranged on the bottom surface of the lower shell 104 by taking the position as the center of a circle; the InGaAs photosensor 110 and the sapphire wafer 109 are concentrically arranged at the middle plane of the M-shaped fixing frame 107;
the soil moisture content sensor 1 is arranged between double-disc furrow openers 4 of the seeder; two disc furrow openers 4 are certain angle symmetry and install in frame riser 6 both sides, and the welding of U-shaped piece 2 is in the back below that frame riser 6 is located between two disc furrow openers 4, and soil moisture content sensor 1 passes through connecting bolt 3 to be installed on U-shaped piece 2, and seed guide 5 is installed in frame riser 6 rear, passes two disc furrow openers 4, and its end is terminal on a vertical line with soil moisture content sensor 1's wedge.
The visible light source 108, the InGaAs photoelectric sensor 110 and the near-infrared light source 111 are connected to the circuit processing module through conducting wires; the circuit processing module comprises a light source drive 112 and a series circuit consisting of a signal amplification module 113, an analog-to-digital converter 115, a singlechip 116 and a storage recording module 114; the InGaAs photoelectric sensor 110 is connected with the signal amplification module 113; the visible light source 108 and the near infrared light source 111 are connected to a light source driver 112.
The bottom of the soil moisture content sensor is provided with a sapphire wafer, so that the photoelectric sensor can be well ensured to receive reflected light, and the parallelism of light beams is improved.
The bottom of the soil moisture content sensor is tightly attached to the bottom of the ditch, the front part of the soil moisture content sensor is designed into an arc shape, the tail part of the soil moisture content sensor is designed into a wedge shape, the tail part of the soil moisture content sensor is close to the tail end of the seed guide pipe, the effect of scraping the bottom of the ditch is achieved, and the falling of seeds is more stable.
The invention has the advantages that the visible light and near infrared soil moisture content sensor can accurately detect soil moisture in real time, has rapid response speed, small volume and convenient installation, and can meet the requirements of vehicle-mounted sensors. (2) The InGaAs photoelectric sensor has the advantages of high sensitivity and quick response when being used for receiving the reflected light. (3) The bottom of the sensor adopts a sapphire wafer, so that the photoelectric sensor can be better ensured to receive reflected light, and the parallelism of light beams is improved. (4) The invention has simple installation and convenient disassembly, and does not need to transform the seeder. (5) The bottom of the sensor is tightly attached to the bottom of the ditch, the front part of the sensor is designed into an arc shape, the tail part of the sensor is designed into a wedge shape and is close to the tail end of the seed guide pipe, the function of scraping the bottom of the ditch is achieved, and the falling of seeds is more stable. (6) The sensor has the advantages of compact internal structure installation, small volume and small occupied space.
Drawings
FIG. 1 is a schematic diagram of a soil moisture content sensor.
Fig. 2 is a schematic view of the overall structure of the soil moisture content sensor mounted on the single body of the seeding machine.
FIG. 3 is a right side view of the soil moisture content sensor mounted on the single body of the seeding machine
Detailed Description
The invention provides a visible light and near-infrared soil moisture content sensor for detecting the moisture content of soil, which comprises the following components: the soil moisture content sensor is arranged between double-disc furrow openers of the seeder and is used for detecting the soil moisture content of the bottom of a furrow opened by the seeder; the present invention will be described in further detail with reference to the following examples and the accompanying drawings.
FIG. 1 is a schematic structural diagram of a soil moisture content sensor. The soil moisture content sensor shown in the figure is a visible light and near infrared based soil moisture content sensor, and the soil moisture content sensor is composed of an upper shell 101, an arc surface connecting screw 102, a side surface connecting screw 103, a lower shell 104, a connecting concave plate 105, a connecting bolt 106, an M-shaped fixing frame 107, a visible light source 108, a sapphire wafer 109, an InGaAs photoelectric sensor 110, a near infrared light source 111, a light source drive 112, a signal amplification module 113, a storage and recording module 114, an analog-to-digital converter 115 and a single chip microcomputer 116; the upper shell 101 and the lower shell 104 are attached through matching notches of the upper shell and the lower shell, and are tightly connected with the bottom cambered surface connecting screw 102 through side connecting screws 103 which are symmetrically arranged on two sides; the threaded holes on the two side surfaces of the connecting concave plate 105 are connected with the upper shell 101 through side connecting screws 103; the bottom surface of the connecting concave plate 105 is fixed with an M-shaped fixing frame 107 through a connecting bolt 106; the bottom of the soil moisture content sensor is provided with a sapphire wafer, so that the photoelectric sensor can be well ensured to receive reflected light, and the parallelism of light beams is improved. The bottom of the soil moisture content sensor is tightly attached to the bottom of the ditch, the front part of the soil moisture content sensor is designed into an arc shape, the tail part of the soil moisture content sensor is designed into a wedge shape, the tail part of the soil moisture content sensor is close to the tail end of the seed guide pipe, the effect of scraping the bottom of the ditch is achieved, and the falling of seeds is more stable. The visible light source 108 and the near-infrared light source 111 are symmetrically arranged on two inclined planes of the M-shaped fixing frame 107 at an angle of 45 degrees; the light emitted by the two light sources is converged at the bottom surface of the lower shell 104, and a sapphire wafer 109 is arranged on the bottom surface of the lower shell 104 by taking the position as the center of a circle; an InGaAs photosensor 110 is mounted concentrically with the sapphire wafer 109 at the mid-plane of the M-shaped mount 107.
The visible light source 108, the InGaAs photoelectric sensor 110 and the near-infrared light source 111 are connected to the circuit processing module through conducting wires; the circuit processing module comprises a light source drive 112 and a series circuit consisting of a signal amplification module 113, an analog-to-digital converter 115, a singlechip 116 and a storage recording module 114; the InGaAs photoelectric sensor 110 is connected with the signal amplification module 113; the visible light source 108 and the near infrared light source 111 are connected to a light source driver 112.
Examples
The general structural schematic diagram of the wu soil moisture content sensor shown in fig. 2 and 3 is installed on the single seeder. Wherein, the soil moisture content sensor 1 is arranged between the double-disc furrow openers 4 of the seeder; two disc furrow openers 4 are certain angle symmetry and install in frame riser 6 both sides, and the welding of U-shaped piece 2 is in the back below that frame riser 6 is located between two disc furrow openers 4, and soil moisture content sensor 1 passes through connecting bolt 3 to be installed on U-shaped piece 2, and seed guide 5 is installed in frame riser 6 rear, passes two disc furrow openers 4, and its end is terminal on a vertical line with soil moisture content sensor 1's wedge.
During operation, the double-disc furrow opener 4 opens a narrow furrow, the cambered surface of the lower shell 104 of the soil moisture content sensor 1 pushes away soil which is dug and fallen back, the wedge-shaped tail part of the lower shell 104 of the soil moisture content sensor 1 scrapes the bottom of the furrow, and seeds fall to the scraped bottom of the furrow from the seed guide pipe 5.
The bottom plane of the soil moisture content sensor 1 is tightly attached to the bottom of the ditch, and the light source driver 112 drives the visible light source 108 and the near infrared light source 111 at a certain frequency, so that the two light sources alternately emit light. The visible light source 108 emits light, which is incident on the trench bottom soil through the sapphire wafer 109, and the reflected light is received by the InGaAs photosensor 110 through the sapphire wafer 109. The InGaAs photosensor 110 converts the received optical signal into an electrical signal, and transmits the electrical signal to the signal amplification module 113 through a wire for electrical signal amplification. The amplified electrical signal is transmitted to the analog-to-digital converter 115, which converts the electrical signal into a readable digital signal voltage value. Similarly, the voltage value obtained after the near-infrared light source 111 is reflected by the soil at the bottom of the trench can be obtained. The single chip microcomputer 116 synthesizes digital signals obtained by the visible light source 108 and the near infrared light source 111 after being reflected by the soil respectively according to a mathematical relationship obtained in a previous laboratory, obtains a moisture content value of the soil, and sends the value to the storage and recording module 114 for storage and recording.
Claims (4)
1. A visible light, near-infrared soil moisture content sensor for detecting soil moisture content: the soil moisture content sensor is arranged between double-disc furrow openers of the seeder and is used for detecting the soil moisture content of the bottom of a furrow opened by the seeder; the soil moisture content sensor is characterized by comprising an upper shell (101), an arc surface connecting screw (102), a side surface connecting screw (103), a lower shell (104), a connecting concave plate (105), a connecting bolt (106), an M-shaped fixing frame (107), a visible light source (108), a sapphire wafer (109), an InGaAs photoelectric sensor (110), a near infrared light source (111), a light source driver (112), a signal amplification module (113), a storage and recording module (114), an analog-to-digital converter (115) and a single chip microcomputer (116); the upper shell (101) and the lower shell (104) are attached through matching notches of the upper shell and the lower shell, and are tightly connected with the bottom cambered surface connecting screw (102) through side connecting screws (103) which are symmetrically arranged on two sides; the threaded holes on the two side surfaces of the connecting concave plate (105) are connected with the upper shell (101) through side connecting screws (103); the bottom surface of the connecting concave plate (105) is fixed with an M-shaped fixing frame (107) through a connecting bolt (106); the visible light source (108) and the near infrared light source (111) are symmetrically arranged on two inclined planes of the M-shaped fixing frame (107) at an angle of 45 degrees; the light emitted by the two light sources is converged at the bottom surface of the lower shell (104), and a sapphire wafer (109) is arranged on the bottom surface of the lower shell (104) by taking the position as the center of a circle; the InGaAs photoelectric sensor (110) and the sapphire wafer (109) are concentrically arranged at the middle plane of the M-shaped fixing frame (107);
the soil moisture content sensor (1) is arranged between double-disc furrow openers (4) of the seeder; two disc furrow openers (4) are certain angle symmetry and install in frame riser (6) both sides, the welding of U-shaped piece (2) is located the back below between two disc furrow opener (4) in frame riser (6), soil moisture content sensor (1) is installed on U-shaped piece (2) through connecting bolt (3), seed guide pipe (5) are installed at frame riser (6) rear, pass two disc furrow openers (4), its end is terminal on a vertical line with the wedge of soil moisture content sensor (1).
2. The visible light, near-infrared soil moisture content sensor for detecting soil moisture content of claim 1: the infrared photoelectric sensor is characterized in that the visible light source (108), the InGaAs photoelectric sensor (110) and the near infrared light source (111) are connected to the circuit processing module through leads; the circuit processing module comprises a light source drive (112) and a series circuit consisting of a signal amplification module (113), an analog-to-digital converter (115), a singlechip (116) and a storage recording module (114); the InGaAs photoelectric sensor (110) is connected with the signal amplification module (113); the visible light source (108) and the near infrared light source (111) are connected to a light source driver (112).
3. The visible light, near-infrared soil moisture content sensor for detecting soil moisture content of claim 1: the soil moisture content sensor is characterized in that a sapphire wafer is adopted at the bottom of the soil moisture content sensor, so that the photoelectric sensor can be better ensured to receive reflected light, and the parallelism of light beams is improved.
4. The visible light, near-infrared soil moisture content sensor for detecting soil moisture content of claim 1: the soil moisture content sensor is characterized in that the bottom of the soil moisture content sensor is tightly attached to the bottom of the groove, the front part of the soil moisture content sensor is designed into an arc shape, the tail part of the soil moisture content sensor is designed into a wedge shape and is close to the tail end of the seed guide pipe, the effect of scraping the bottom of the groove is achieved, and the seeds fall more stably.
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| CN202110099036.XA CN112858222B (en) | 2021-01-25 | 2021-01-25 | Visible light and near infrared soil moisture content sensor for detecting soil moisture content |
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| CN202110099036.XA CN112858222B (en) | 2021-01-25 | 2021-01-25 | Visible light and near infrared soil moisture content sensor for detecting soil moisture content |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5044756A (en) * | 1989-03-13 | 1991-09-03 | Purdue Research Foundation | Real-time soil organic matter sensor |
| JP2003139765A (en) * | 2001-07-06 | 2003-05-14 | Sakae Shibusawa | Device for observing characteristic of soil |
| CN104132903A (en) * | 2014-05-23 | 2014-11-05 | 中国农业大学 | Soil moisture content measuring system and measuring method using the same |
| CN204630922U (en) * | 2015-05-22 | 2015-09-09 | 中国农业大学 | Based on the soil organism and the MOISTURE MEASUREMENT SYSTEM of near-infrared spectrum technique |
| CN105510239A (en) * | 2014-10-09 | 2016-04-20 | 江苏金秆农业装备有限公司 | Soil multispectral information collecting device |
| CN214374292U (en) * | 2021-01-25 | 2021-10-08 | 中国农业大学 | Soil moisture content sensor based on visible light and near infrared |
-
2021
- 2021-01-25 CN CN202110099036.XA patent/CN112858222B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5044756A (en) * | 1989-03-13 | 1991-09-03 | Purdue Research Foundation | Real-time soil organic matter sensor |
| JP2003139765A (en) * | 2001-07-06 | 2003-05-14 | Sakae Shibusawa | Device for observing characteristic of soil |
| CN104132903A (en) * | 2014-05-23 | 2014-11-05 | 中国农业大学 | Soil moisture content measuring system and measuring method using the same |
| CN105510239A (en) * | 2014-10-09 | 2016-04-20 | 江苏金秆农业装备有限公司 | Soil multispectral information collecting device |
| CN204630922U (en) * | 2015-05-22 | 2015-09-09 | 中国农业大学 | Based on the soil organism and the MOISTURE MEASUREMENT SYSTEM of near-infrared spectrum technique |
| CN214374292U (en) * | 2021-01-25 | 2021-10-08 | 中国农业大学 | Soil moisture content sensor based on visible light and near infrared |
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