CN111678872A - Vehicle-mounted crop nitrogen detection device based on laser detection analysis technology and detection method thereof - Google Patents
Vehicle-mounted crop nitrogen detection device based on laser detection analysis technology and detection method thereof Download PDFInfo
- Publication number
- CN111678872A CN111678872A CN202010553759.8A CN202010553759A CN111678872A CN 111678872 A CN111678872 A CN 111678872A CN 202010553759 A CN202010553759 A CN 202010553759A CN 111678872 A CN111678872 A CN 111678872A
- Authority
- CN
- China
- Prior art keywords
- laser
- laser diode
- detection
- crop
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06804—Stabilisation of laser output parameters by monitoring an external parameter, e.g. temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Automation & Control Theory (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a vehicle-mounted crop nitrogen detection device based on a laser detection analysis technology and a detection method thereof. The laser probe assembly comprises a laser emitting module and a light receiving module, wherein the laser emitting module comprises a first laser diode and a second laser diode, the first laser diode and the second laser diode are parallel, and extension lines of emitting ports of the first laser diode and the second laser diode are at 45-degree included angles with a horizontal plane at the top of a cab of an agricultural vehicle body. The invention adopts the high-power laser as the light source, and irradiates crops in an inclined mode, thereby enlarging the measurement area of the crop nitrogen detection device and improving the utilization rate of the crop nitrogen detection device; the received modulated diffuse reflection optical signal is demodulated by adopting a high-frequency modulation digital phase-locked demodulation technology, the influence of external environment light on measurement and the interference generated by vibration during vehicle-mounted operation are further eliminated, and the detection limit and the detection sensitivity of the crop nitrogen detection device are improved.
Description
Technical Field
The invention relates to the technical field of crop nitrogen detection, in particular to a vehicle-mounted crop nitrogen detection device based on a laser detection analysis technology and a detection method thereof.
Background
The nitrogen is an essential element for the growth and development of crops, and the content of the nitrogen in crops is about 2 to 4 percent. Nitrogen is the component of important compounds such as protein, nucleic acid, chlorophyll a, chlorophyll b, enzyme and the like in crops. In the growth process of crops, the increase of the use amount of the nitrogen fertilizer can obviously promote the metabolism and growth in the crops. In recent years, nitrogen fertilizers are used in large quantities in order to improve crop yield, and excessive application of nitrogen fertilizers not only increases production cost, but also directly or indirectly pollutes the environment. The nitrogen fertilizer is scientifically and reasonably used, so that the yield and the quality of crops can be ensured, the utilization rate of the nitrogen fertilizer can be improved, the growth cost is reduced, and the environmental pollution is reduced.
The conventional method for detecting crop nitrogen is laboratory chemical quantitative analysis. Although this method is highly accurate, it requires destructive sampling, is time consuming, costly to analyze, and has poor real-time performance, limiting its widespread use and failing to achieve high-throughput detection. The crop nitrogen detection method based on the optical technology is focused on widely due to the real-time, rapid, accurate, large-range, nondestructive and low cost. Through the search of the prior art documents, a two-band crop canopy nitrogen measurement sensor is introduced in the U.S. patent (U.S. Pat. No. 6596996B1), and an optical sensing device for modulating a multicolor light source is introduced in the U.S. patent (U.S. Pat. No. 7408145B2), wherein the light source is vertically irradiated, so that the measurement range is limited; the united states patent (US 7910876B2) describes a crop nitrogen sensor based on pulsed laser, which can be used for measuring a large area of canopy, but it adopts a detector to collect the reflected light of different lasers of the crop canopy in a time-sharing way, and the detected data is directly sampled and processed, so that the measuring precision is limited.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a vehicle-mounted crop nitrogen detection device based on a laser detection analysis technology and a detection method thereof to solve the problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a vehicle-mounted crop nitrogen detection device based on a laser detection analysis technology comprises an agricultural machinery vehicle body, wherein a laser probe assembly is installed at the top of a cab of the agricultural machinery vehicle body, the output end of the laser probe assembly is connected with the input end of an industrial display screen through a CAN bus,
the laser probe assembly comprises a laser emitting module and a light receiving module, the laser emitting module comprises a first laser diode and a second laser diode, the first laser diode and the second laser diode are parallel, and extension lines of emitting ports of the first laser diode and the second laser diode are at 45-degree included angles with the horizontal plane of the top of a cab of the agricultural vehicle body.
The light receiving module comprises a first flat lens, a second flat lens, a first narrow-band filter, a second narrow-band filter, a first photodiode, a second photodiode, a first preamplifier and a second preamplifier, wherein the first flat lens and the second flat lens collect crop diffuse reflection light and focus the crop diffuse reflection light on the corresponding first laser diode and the second laser diode respectively.
The wavelength of the first laser diode is 730nm, the wavelength of the second laser diode is 808nm, and the power of the first laser diode and the power of the second laser diode are both 1 watt.
The wavelengths of the first narrow-band optical filter and the second narrow-band optical filter are 730nm and 808nm respectively, and the bandwidths are 10 nm; the focal lengths of the first flat lens and the second flat lens are both 30 mm.
The laser emission module further comprises a first laser driver, a second laser driver, a first temperature sensor, a second temperature sensor, a first temperature controller, a second temperature controller, a first beam splitter, a second beam splitter, a first photodiode, a first amplifying circuit, a first feedback circuit, a second photodiode, a second amplifying circuit and a second feedback circuit; the first preamplifier and the second preamplifier respectively amplify corresponding photodiode signals, the amplification factors of the first preamplifier and the second preamplifier are automatically adjusted, the digital phase-locked amplifier is connected with the light receiving module and is double-channel, a signal generating module is integrated in the digital phase-locked amplifier and outputs a first square wave and a second square wave which are respectively modulated by the first laser diode and the second laser diode, the frequencies of the two square waves are the same, the second square wave passes through an inverter circuit, the phase of the second square wave is 180 degrees different from that of the first square wave, the digital phase-locked amplifier demodulates the signals from the light receiving module, the signal output end of the digital phase-locked amplifier is connected with an analog-to-digital conversion module, the microprocessor controls the temperature controller, the digital phase-locked amplifier and the analog-to-digital conversion module and calculates normalized vegetation indexes NDVI, the microprocessor is an ARM or a DSP, the temperature controller, The digital phase-locked amplifier, the analog-to-digital conversion module and the temperature sensor are all connected with the microprocessor, the CAN bus interface is used for communicating with an upper computer, and the power module supplies power to the whole device.
A detection method of a vehicle-mounted crop nitrogen detection device based on a laser detection analysis technology comprises the following steps:
and (3) stable control of laser output power: the temperature feedback and power feedback dual-control strategy is characterized in that the temperature of the two lasers is measured through the first temperature sensor and the second temperature sensor, and the first temperature controller and the second temperature controller are adjusted according to the measurement result of the temperature sensors so as to achieve the temperature stability of the two lasers and further stabilize the output power of the two lasers; the laser comprises a first laser driving circuit, a second laser driving circuit, a first beam splitter, a second beam splitter, a first photodiode, a second photodiode, a first amplifying circuit and a second amplifying circuit, wherein the first laser driving circuit, the second laser driving circuit and the first feedback circuit are connected in series;
emission of laser detection signals: the laser detection signal is output by high-frequency modulation, two channels of the digital phase-locked amplifier respectively output square waves, the frequencies of the square waves of the two channels are the same, and the two channels respectively modulate a first laser diode and a second laser diode; the square wave of the second laser diode is modulated to pass through an inverter circuit, so that the phase difference between the square wave and the first square wave is 1800, the first laser diode and the second laser diode are periodically switched and triggered, and laser is emitted at a certain inclination angle;
receiving a laser detection feedback signal: the laser feedback signal double-light-path detection is carried out, emitted laser irradiates crops to generate diffuse reflection light, and the diffuse reflection light is collected by a first light receiving module and a second light receiving module in a light receiving module;
preprocessing a laser signal: the laser feedback signal is demodulated in a digital phase-locked mode, collected signals are subjected to signal amplification processing through a first preamplifier circuit and a second preamplifier circuit and are demodulated through a double-channel independent digital phase-locked amplifier, and the amplification ratio of the first preamplifier circuit and the second preamplifier circuit is automatically adjusted according to the size of the received signals;
calculation of normalized vegetation index: the microprocessor carries out calculation processing to calculate a normalized vegetation index NDVI, and the normalized vegetation index NDVI is calculated according to the following formula:
wherein R is808、R730Respectively 808nm laser diode and 730nm laser diode diffuse reflection light reflectivity;
constructing a crop nitrogen inversion model: and (3) constructing a crop nitrogen inversion model by using the crop normalized vegetation index NDVI measured in real time and crop nitrogen data measured by a corresponding crop laboratory method through a partial least square method.
Detecting nitrogen of crops with unknown samples: and detecting the nitrogen of the undetected crops by utilizing a crop nitrogen inversion model.
Advantageous effects
Compared with the prior art, the vehicle-mounted crop nitrogen detection device based on the laser detection analysis technology and the detection method thereof have the advantages that:
1. the high-power laser is used as a light source, and the crop is irradiated in an inclined mode, so that the measurement area of the crop nitrogen detection device is enlarged, and the utilization rate of the crop nitrogen detection device is improved;
2. for two laser diodes, a double-detector structure is adopted to combine with a narrow-band optical filter to filter and receive diffuse reflection light of a crop canopy, so that the influence of external environment light is reduced, and the measurement precision is improved;
3. the received modulated diffuse reflection optical signal is demodulated by adopting a high-frequency modulation digital phase-locked demodulation technology, the influence of external environment light on measurement and the interference generated by vibration during vehicle-mounted operation are further eliminated, and the detection limit and the detection sensitivity of the crop nitrogen detection device are improved.
Drawings
FIG. 1 is a schematic diagram of the connection of the on-board crop nitrogen detection device of the present invention;
FIG. 2 is a schematic diagram of the connection of the laser probe of the vehicle-mounted crop nitrogen detection device according to the present invention;
FIG. 3 is a schematic diagram of the laser diode optical power stability control of the vehicle-mounted crop nitrogen detection device according to the present invention;
FIG. 4 is a schematic diagram of a probe light receiving module of the vehicle-mounted crop nitrogen detection device according to the present invention;
FIG. 5 is a schematic diagram of the laser diode optical power operation of the vehicle-mounted crop nitrogen detection device of the present invention;
FIG. 6 is a sequence chart of the detection method of the present invention.
Detailed Description
So that the manner in which the above recited features of the present invention can be understood and readily understood, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings, wherein:
as shown in figure 1, the vehicle-mounted crop nitrogen detection device based on the laser detection and analysis technology comprises an agricultural machinery vehicle body, wherein a laser probe assembly is mounted at the top of a cab of the agricultural machinery vehicle body, and the output end of the laser probe assembly is connected with the input end of an industrial display screen through a CAN bus.
As shown in fig. 2 and 5, the laser probe assembly comprises a laser emitting module and a light receiving module, the laser emitting module comprises a first laser diode and a second laser diode, the first laser diode and the second laser diode are parallel, and extension lines of emitting ports of the first laser diode and the second laser diode are respectively parallel to each other and form an included angle of 45 degrees with a horizontal plane at the top of a cab of the agricultural vehicle body.
As shown in fig. 3 and 4, the light receiving module includes a first flat lens, a second flat lens, a first narrow band filter, a second narrow band filter, a first photodiode, a second photodiode, a first preamplifier, and a second preamplifier, and the first flat lens and the second flat lens collect diffuse reflection light of crops and focus the light on the corresponding first laser diode and the second laser diode respectively. The wavelength of the first laser diode is 730nm, the wavelength of the second laser diode is 808nm, and the power of the first laser diode and the power of the second laser diode are both 1 watt.
The wavelengths of the first narrow-band optical filter and the second narrow-band optical filter are 730nm and 808nm respectively, and the bandwidths are 10 nm; the focal lengths of the first flat lens and the second flat lens are both 30 mm.
The laser emission module further comprises a first laser driver, a second laser driver, a first temperature sensor, a second temperature sensor, a first temperature controller, a second temperature controller, a first beam splitter, a second beam splitter, a first photodiode, a first amplifying circuit, a first feedback circuit, a second photodiode, a second amplifying circuit and a second feedback circuit;
the first preamplifier and the second preamplifier respectively amplify corresponding photodiode signals, the amplification factors of the first preamplifier and the second preamplifier are automatically adjusted, the digital phase-locked amplifier is connected with the light receiving module and is double-channel, a signal generating module is integrated in the digital phase-locked amplifier and outputs a first square wave and a second square wave which are respectively modulated by the first laser diode and the second laser diode, the frequencies of the two square waves are the same, the second square wave passes through an inverter circuit and is different from the first square wave by 1800, the digital phase-locked amplifier demodulates the signals from the light receiving module, the signal output end of the digital phase-locked amplifier is connected with an analog-to-digital conversion module, the microprocessor controls the temperature controller, the digital phase-locked amplifier and the analog-to-digital conversion module and calculates normalized vegetation indexes NDVI, the microprocessor is an ARM or a DSP, the temperature controller, The digital phase-locked amplifier, the analog-to-digital conversion module and the temperature sensor are all connected with the microprocessor, the CAN bus interface is used for communicating with an upper computer, and the power module supplies power to the whole device.
As shown in fig. 6, there is also provided a detection method of a vehicle-mounted crop nitrogen detection device based on a laser detection analysis technology, which is characterized by comprising the following steps:
in the first step, the output power of the laser is stably controlled.
The temperature feedback and power feedback dual-control strategy is characterized in that the temperature of the two lasers is measured through the first temperature sensor and the second temperature sensor, and the first temperature controller and the second temperature controller are adjusted according to the measurement result of the temperature sensors so as to achieve the temperature stability of the two lasers and further stabilize the output power of the two lasers; the first and second feedback circuits compare the amplified signal with a set value and adjust the two laser driving circuits to achieve stable output power of the laser.
And secondly, sending out a laser detection signal.
The laser detection signal is output by high-frequency modulation, two channels of the digital phase-locked amplifier respectively output square waves, the frequencies of the square waves of the two channels are the same, and the two channels respectively modulate a first laser diode and a second laser diode; the square wave of the second laser diode is modulated to pass through the phase inversion circuit, so that the phase difference between the square wave and the first square wave is 1800, the first laser diode and the second laser diode are periodically switched and triggered, and laser is emitted at a certain inclination angle.
And thirdly, receiving the laser detection feedback signal.
The laser feedback signal double-light-path detection is carried out, emitted laser irradiates on crops to generate diffuse reflection light, and the diffuse reflection light is collected by a first light receiving module and a second light receiving module in the light receiving module.
And fourthly, preprocessing the laser signal.
The laser feedback signal is demodulated in a digital phase-locked mode, collected signals are subjected to signal amplification processing through a first preamplifier circuit and a second preamplifier circuit and are demodulated through a double-channel independent digital phase-locked amplifier, and the amplification ratio of the first preamplifier circuit and the second preamplifier circuit is automatically adjusted according to the size of the received signals.
And fifthly, calculating the normalized vegetation index.
The microprocessor carries out calculation processing to calculate a normalized vegetation index NDVI, and the normalized vegetation index NDVI is calculated according to the following formula:
wherein R is808、R730Respectively 808nm laser diode and 730nm laser diode diffuse reflection light reflectivity.
And sixthly, constructing a crop nitrogen inversion model. And (3) constructing a crop nitrogen inversion model by using the crop normalized vegetation index NDVI measured in real time and crop nitrogen data measured by a corresponding crop laboratory method through a partial least square method.
Seventhly, detecting the nitrogen of the crops with unknown samples: and detecting the nitrogen of the undetected crops by utilizing a crop nitrogen inversion model.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an on-vehicle crops nitrogen detection device based on laser detection analytical technique, includes the agricultural machinery automobile body, agricultural machinery automobile body driver's cabin top install the laser probe subassembly, the output of laser probe subassembly pass through the input of CAN bus and industrial display screen and link to each other its characterized in that:
the laser probe assembly comprises a laser emitting module and a light receiving module, the laser emitting module comprises a first laser diode and a second laser diode, the first laser diode and the second laser diode are parallel, and extension lines of emitting ports of the first laser diode and the second laser diode are at 45-degree included angles with the horizontal plane of the top of a cab of the agricultural vehicle body.
2. The vehicle-mounted crop nitrogen detection device based on the laser detection analysis technology as claimed in claim 1, characterized in that: the light receiving module comprises a first flat lens, a second flat lens, a first narrow-band filter, a second narrow-band filter, a first photodiode, a second photodiode, a first preamplifier and a second preamplifier, wherein the first flat lens and the second flat lens collect crop diffuse reflection light and focus the crop diffuse reflection light on the corresponding first laser diode and the second laser diode respectively.
3. The vehicle-mounted crop nitrogen detection device based on the laser detection analysis technology as claimed in claim 1, characterized in that: the wavelength of the first laser diode is 730nm, the wavelength of the second laser diode is 808nm, and the power of the first laser diode and the power of the second laser diode are both 1 watt.
4. The vehicle-mounted crop nitrogen detection device based on the laser detection analysis technology as claimed in claim 2, characterized in that: the wavelengths of the first narrow-band optical filter and the second narrow-band optical filter are 730nm and 808nm respectively, and the bandwidths are 10 nm; the focal lengths of the first flat lens and the second flat lens are both 30 mm.
5. The vehicle-mounted crop nitrogen detection device based on the laser detection analysis technology as claimed in claim 1, characterized in that: the laser emission module further comprises a first laser driver, a second laser driver, a first temperature sensor, a second temperature sensor, a first temperature controller, a second temperature controller, a first beam splitter, a second beam splitter, a first photodiode, a first amplifying circuit, a first feedback circuit, a second photodiode, a second amplifying circuit and a second feedback circuit; the first preamplifier and the second preamplifier respectively amplify corresponding photodiode signals, the amplification factors of the first preamplifier and the second preamplifier are automatically adjusted, the digital phase-locked amplifier is connected with the light receiving module and is double-channel, a signal generating module is integrated in the digital phase-locked amplifier and outputs a first square wave and a second square wave which are respectively modulated by the first laser diode and the second laser diode, the frequencies of the two square waves are the same, the second square wave passes through an inverter circuit, the phase of the second square wave is 180 degrees different from that of the first square wave, the digital phase-locked amplifier demodulates the signals from the light receiving module, the signal output end of the digital phase-locked amplifier is connected with an analog-to-digital conversion module, the microprocessor controls the temperature controller, the digital phase-locked amplifier and the analog-to-digital conversion module and calculates normalized vegetation indexes NDVI, the microprocessor is an ARM or a DSP, the temperature controller, The digital phase-locked amplifier, the analog-to-digital conversion module and the temperature sensor are all connected with the microprocessor, the CAN bus interface is used for communicating with an upper computer, and the power module supplies power to the whole device.
6. The detection method of the vehicle-mounted crop nitrogen detection device based on the laser detection analysis technology as claimed in claim 1, characterized by comprising the following steps:
61) and (3) stable control of laser output power: the temperature feedback and power feedback dual-control strategy is characterized in that the temperature of the two lasers is measured through the first temperature sensor and the second temperature sensor, and the first temperature controller and the second temperature controller are adjusted according to the measurement result of the temperature sensors so as to achieve the temperature stability of the two lasers and further stabilize the output power of the two lasers; the laser comprises a first laser driving circuit, a second laser driving circuit, a first beam splitter, a second beam splitter, a first photodiode, a second photodiode, a first amplifying circuit and a second amplifying circuit, wherein the first laser driving circuit, the second laser driving circuit and the first feedback circuit are connected in series;
62) emission of laser detection signals: the laser detection signal is output by high-frequency modulation, two channels of the digital phase-locked amplifier respectively output square waves, the frequencies of the square waves of the two channels are the same, and the two channels respectively modulate a first laser diode and a second laser diode; the square wave of the second laser diode is modulated to pass through the phase reversal circuit, so that the phase difference between the square wave and the first square wave is 180 degrees, the first laser diode and the second laser diode are periodically switched and triggered, and the laser is emitted at a certain inclination angle;
63) receiving a laser detection feedback signal: the laser feedback signal double-light-path detection is carried out, emitted laser irradiates crops to generate diffuse reflection light, and the diffuse reflection light is collected by a first light receiving module and a second light receiving module in a light receiving module;
64) preprocessing a laser signal: the laser feedback signal is demodulated in a digital phase-locked mode, collected signals are subjected to signal amplification processing through a first preamplifier circuit and a second preamplifier circuit and are demodulated through a double-channel independent digital phase-locked amplifier, and the amplification ratio of the first preamplifier circuit and the second preamplifier circuit is automatically adjusted according to the size of the received signals;
65) calculation of normalized vegetation index: the microprocessor carries out calculation processing to calculate a normalized vegetation index NDVI, and the normalized vegetation index NDVI is calculated according to the following formula:
wherein R is808、R730Respectively 808nm laser diode and 730nm laser diode diffuse reflection light reflectivity;
66) constructing a crop nitrogen inversion model: and (3) constructing a crop nitrogen inversion model by using the crop normalized vegetation index NDVI measured in real time and crop nitrogen data measured by a corresponding crop laboratory method through a partial least square method.
67) Detecting nitrogen of crops with unknown samples: and detecting the nitrogen of the undetected crops by utilizing a crop nitrogen inversion model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553759.8A CN111678872B (en) | 2020-06-17 | 2020-06-17 | Vehicle-mounted crop nitrogen detection device based on laser detection analysis technology and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553759.8A CN111678872B (en) | 2020-06-17 | 2020-06-17 | Vehicle-mounted crop nitrogen detection device based on laser detection analysis technology and detection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111678872A true CN111678872A (en) | 2020-09-18 |
| CN111678872B CN111678872B (en) | 2023-02-28 |
Family
ID=72436068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010553759.8A Active CN111678872B (en) | 2020-06-17 | 2020-06-17 | Vehicle-mounted crop nitrogen detection device based on laser detection analysis technology and detection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111678872B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539392A (en) * | 2011-12-21 | 2012-07-04 | 北京农业信息技术研究中心 | System and method for on-line detection of nitrogen in farmland soil |
| US20150254800A1 (en) * | 2014-03-06 | 2015-09-10 | F12 Solutions, Llc | Nitrogen status determination in growing crops |
| CN110579447A (en) * | 2019-09-28 | 2019-12-17 | 中国科学院合肥物质科学研究院 | Crop nitrogen detection device and detection method thereof |
-
2020
- 2020-06-17 CN CN202010553759.8A patent/CN111678872B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539392A (en) * | 2011-12-21 | 2012-07-04 | 北京农业信息技术研究中心 | System and method for on-line detection of nitrogen in farmland soil |
| US20150254800A1 (en) * | 2014-03-06 | 2015-09-10 | F12 Solutions, Llc | Nitrogen status determination in growing crops |
| CN110579447A (en) * | 2019-09-28 | 2019-12-17 | 中国科学院合肥物质科学研究院 | Crop nitrogen detection device and detection method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 周光华等: "激光技术在农作物检测中的应用进展", 《安徽农业科学》 * |
| 夏慧;张玉钧;王晓梅;李宏斌;刘建国;李季;刘文清;: "植物氮素含量双波长光学遥测系统的研制" * |
| 梁留锁;马旭;乔欣;: "大豆叶片氮素含量检测装置的研究" * |
| 梁留锁等: "大豆叶片氮素含量检测装置的研究", 《农机化研究》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111678872B (en) | 2023-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101435773B (en) | Gas monitoring method and apparatus based on quasi continuous diode laser modulated spectrum | |
| KR101224976B1 (en) | Fluorescence detecting device and fluorescence detecting method | |
| CN104535530B (en) | High-precision gas concentration detection method and detection apparatus thereof | |
| US6664533B1 (en) | Apparatus and method of remote gas trace detection | |
| JP4634374B2 (en) | Active remote sensing using spectrum lock-in technology | |
| CN201063022Y (en) | Device for laser telemetry of double sensitiveness vehicle vent gas | |
| CN204556499U (en) | The multi-channel high-speed data acquisition and processing system of tuning diode absorption spectrum | |
| CN111829982A (en) | Multi-component gas concentration detection and temperature error correction method | |
| CN100495070C (en) | Microwave windfinding laser radar apparatus | |
| CN102253015A (en) | Embedded immunochromatography fluorescence detection system and detection method | |
| CN107462900B (en) | Gas component detection laser radar based on wavelength tunable laser source | |
| CN105928902A (en) | High-spectrum-resolution total atmospheric spectral transmittance measuring method | |
| US20120183440A1 (en) | Fret measurement method and device | |
| CN107064084A (en) | Microminiature laser fluorescence spectrum instrument and spectral method of detection | |
| CN109724948A (en) | A kind of diesel emission test device and method based on single longitudinal mode frequency stabilized carbon dioxide laser | |
| CN207730661U (en) | Gas component detection device | |
| CN105388125A (en) | Optical detection system for carbon monoxide concentration | |
| CN106556580A (en) | A kind of chlorophyll fluorescence detects circuit | |
| CN110579447A (en) | Crop nitrogen detection device and detection method thereof | |
| CN111678872B (en) | Vehicle-mounted crop nitrogen detection device based on laser detection analysis technology and detection method thereof | |
| CN100575949C (en) | One kind of plant normalizing index remote sensor | |
| JPH08101123A (en) | Method and device for sensing gas concentration | |
| CN111208084A (en) | Optical fiber gas concentration remote sensing detection device and method based on coherent detection method | |
| CN206862883U (en) | Detection means based on TDLAS trace CO gas concentrations | |
| CN106483098A (en) | The alcohol gas concentration method of telemetering based on tunable laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |