GD51-KGHPhotosynthetic active radiation transmitter IoT sensor

The spectral components of solar radiation that are effective for plant photosynthesis are called photosynthetically active radiation (PAR), with a wavelength range400~700 nanometers, which basically overlaps with visible light. The proportion of photosynthetically active radiation to direct solar radiation increases with the increase of solar altitude angle, reaching up to 45%. In scattered radiation, the proportion of photosynthetically active radiation can reach as high as 60-70%, so cloudy days actually increase the proportion of PAR. The average photosynthetically active radiation accounts for about 50% of the total solar radiation.

The portion of spectral energy absorbed by green plants during photosynthesis that excites chlorophyll molecules from solar radiation. The wavelength is represented by the symbol Qp, and the unit isμmol/m2·sPhotosynthetically active radiation isplantThe fundamental energy source for generating biomass、Organic substance synthesis，It directly affects the growth, development, yield, and product quality of plants.

The photosynthetically active radiation sensor is mainly used to measure photosynthetically active radiation in the wavelength range of 400-700nm in sunlight. Measure the photosynthetically active radiation within the wavelength range of 400-700nm using optical filters. When illuminated, a voltage signal is generated that is proportional to the intensity of the incident radiation, and its sensitivity is proportional to the cosine of the angle of incidence of the incident light. And provide accurate, real-time, and effective data on photosynthetically active radiation.

GD51-KGHPhotosynthetic active radiation transmitter IoT sensor application area

1. Solar energy research

Since radiation recorders are instruments for measuring light, it is also very suitable to use them for solar energy research.

2. Experimental research institutions
The improvement of agricultural production yield and quality cannot be achieved without various agricultural research experiments, and light runs through the process of plant growth. Therefore, when conducting research on photosynthesis, radiation recorders are naturally needed.
3. Tourism environmental protection and ecology
In many regions of China, modern agricultural park construction is carried out by utilizing local advantages to provide projects such as farm picking. Therefore, in order to develop the tourism industry, it is necessary to provide tourists with beautiful agricultural park environments and high-quality agricultural products. Photosynthetic effective radiation is the energy source of plant photosynthesis, which affects the yield and product quality formed during the photosynthesis process. Therefore, radiation recorders are also needed for tourism environmental protection and ecological construction.
4. Research on photosynthetic potential
The use of radiation recorders to study photosynthetic potential is mainly focused on the research field, with the aim of improving crop production potential through the utilization of light energy and contributing to human development.

5. Research on plant growth, photosynthesis, and vegetation index

Photosynthetically active radiation has a regulatory effect on plant photosynthesis, growth and development, morphogenesis, and metabolism. Different wavelengths of light irradiated on plants have different physiological effects, and therefore the weight of light in photosynthesis varies with the variety and growth stage of the plant.

6. Greenhouse

Measuring the photosynthetically active radiation inside the greenhouse can grasp the internal light intensity of the greenhouse, evaluate the lighting environment inside the greenhouse, and provide a basis for selecting suitable crop varieties for planting in the greenhouse. The greenhouse automatic rolling shutter device can also be controlled based on the effective photosynthetic rate.

7. Facility agriculture

It can also be applied in facility agriculture, especially in plant factories equipped with plant fill lights. By using photosynthetically active radiation measurement, the lighting environment in the entire greenhouse can be monitored and adjusted, and the light data of plants during their growth cycle can be accumulated. Artificial supplementary lighting in facility agriculture must follow the photophysiological characteristics of plants in order to achieve the best non light effect. Therefore, it is necessary to accurately measure the spectral composition and irradiation intensity of supplementary lighting sources; On the other hand, the study of the photophysical characteristics of plants also requires accurate measurement of incident light.

GD51-KGHPhotosynthetic active radiation transmitter IoT sensor Technical Parameter