Mobile crop growth monitoring station

1、 Instrument Introduction:

Mobile crop growth monitoring stationJN-YPZ100， Also known as crop growth and health monitoring equipment. Used for research on plant canopies of various heights, using fisheye lenses and CCD image sensors to obtain plant canopy images, and using specialized analysis software to obtain relevant indicators and parameters of the plant canopy. By using fisheye lens imaging to measure plant canopy data, only one operation is required, simplifying the complex work of traditional measurement methods that require multiple measurements at fixed points per day. Moreover, using image method to measure canopy can actively avoid canopy gaps that do not comply with the calculated canopy structure parameters, as well as obstacles that do not comply with measurement calculations.

2、 Measurement parameters:

Leaf Area Index

• Average inclination angle of blades

Scattering radiation transmittance

Direct radiation transmittance at different solar altitude angles

• Extinction coefficient at different solar altitude angles

• Directional distribution of leaf area density

3、 Purpose and Scope of Application:

• Can measure the direct sunlight transmittance, scattered light transmittance, extinction coefficient, leaf area index, and average leaf inclination angle of the plant canopy

• Can be used for measuring and analyzing the light exposure status of crop, fruit tree, and forest canopy

• Can be used for comparing the structures of different plant populations

• Can dynamically monitor the growth process of crop populations in farmland

Research and teaching applicable to the dynamic monitoring of plant populations in ecological fields

Suitable for research and teaching in agriculture, horticulture, and forestry related to cultivation, breeding, plant population comparison, and development

4、 Principles and Methods:

The plant canopy image analyzer adopts the principle of correlation between canopy porosity and canopy structure. It is based on the Beer's law of attenuation of light passing through a medium, and defines a series of assumptions for the plant canopy. Using a semi theoretical and semi empirical formula, the canopy structure parameters are calculated by measuring the canopy porosity. This is the principle unanimously adopted by various canopy analyzers around the world. Under the above principle, the plant canopy image analyzer adopts the method of analyzing and measuring the canopy porosity of the hemisphere image under the canopy. This method is accurate, labor-saving, time-saving, fast and convenient among various methods.

5、 Structural features:

A small fisheye camera lens specially designed for measuring plant canopy structure is installed on a universal balance joint, which can automatically maintain the lens in a horizontal state

The lens is installed at one end of the measuring rod, which can easily extend horizontally forward or vertically upward into the dense canopy. The communication line at one end of the measuring rod can be connected to a computer for easy image taking operation

Due to its compact size and the presence of measuring rods, it can be extended into different heights of the canopy to quickly perform layered measurements, measuring the vertical distribution of light transmittance and leaf area index within the population

The measuring rod is equipped with a linear PAR probe, which can also measure the photon flux density (μ mol/㎡• S) inside and outside the canopy. This value can be used as a reference for energy analysis inside the canopy

6、 Functional features:

Non destructive measurement of canopy structure

• Can measure photosynthetically active radiation (PAR) inside and outside the canopy

Handheld universal joint with automatic horizontal adjustment probe, no need for tripod

The use of the instrument is not affected by cloudy or windy conditions

A portable laptop can help you select sampling points correctly and make real-time decisions on image selection

Powered by an external lithium battery pack, it is convenient for observation and long-term measurement, especially suitable for completing heavy field observation tasks

Image analysis software can define any image analysis area (zenith angle can be divided into 10 areas, azimuth angle can be divided into 10 areas). When conducting regional analysis on canopies in different directions, it is possible to arbitrarily shield ground scenery and unreasonable canopy parts (such as missing plants, edge row problems, etc.). The selection of starting and ending angles for different zenith angles can avoid canopy pore conditions that do not comply with the calculation of canopy structure parameters. By manually adjusting the threshold, parameters such as leaf area index can be measured more accurately

7、 Main technical parameters:

• Camera angle: 150 °

• Resolution: 768 × 494pix

• Measurement range: The zenith angle can be divided into ten regions from 0 ° to 75 ° (150 ° fisheye lens), and the azimuth angle of 360 ° can also be divided into ten regions

PAR sensing range: sensing spectrum from 400nm to 700nm

• Measurement range: 0-2000 μ mol/㎡ • S

PAR light quantum sensors: 25

Lens diameter: 6cm, height: 10cm, measuring rod length: 300mm

Total weight: 500 grams (excluding laptop)

• Transmission interface: USB

• Working temperature: 0-55 ℃

• Power supply: 8.4V rechargeable lithium battery pack

The above is aboutMobile crop growth monitoring stationDetailed introduction of JN-YPZ100.