Photosynthetically active radiation is the basic energy source for the formation of biomass, which controls the rate of effective photosynthesis in terrestrial organisms and directly affects the growth, development, yield and quality of plants. At the same time, photosynthetically active radiation is also an important climate resource, affecting the exchange of material and energy between the surface and the atmosphere. Measurement and estimation of photosynthetically active radiation is of great significance in estimating plant photosynthesis, exploring the origin of green vegetation, the mechanism of biological utilization of solar energy, etc., and is directly related to the formation of agricultural yields and is the basis for further improvement of agricultural yields.


The PAR Sensor adopts the principle of photoelectric sensing and can be used to measure PAR in the spectral range of 400~700nm. The sensor adopts high-precision photoelectric sensing element with wide spectral absorption, high absorption in the range of 400-700nm and good stability; when there is light, it generates a voltage signal proportional to the intensity of the incident radiation and its sensitivity is proportional to the cosine of the angle of direct incidence of the incident light. The dust cover adopts special treatment to reduce dust adsorption and effectively prevent the interference of environmental factors on the internal components, which can measure the photosynthetically active radiation more accurately.


Plant Photosynthesis Studies, Vegetation Index Studies, etc.

PAR regulates photosynthesis, growth and development, morphogenesis and plant metabolism. Different wavelengths of light irradiated on plants have different physiological effects on plants, thus the weight of different wavelengths of light involved in photosynthesis is different and varies with plant species and growth stages. The data of photosynthetically active radiation measured by the PAR sensor are of great significance to the study of plant growth, plant photosynthesis and vegetation index.



Measurement of photosynthetically active radiation in the greenhouse can grasp the intensity of light in the greenhouse, the light environment in the greenhouse to assess the greenhouse so as to provide a basis for the selection of suitable crop varieties for planting in the greenhouse, but also according to the amount of photosynthetically active radiation to control the greenhouse automatic shuttering device, and so on.


Facility Agriculture

PAR sensors can be used in facility agriculture, especially in plant factories where supplemental plant lighting has been added. Measurement of the photosynthetically active radiation can be used to monitor and regulate the light environment in the entire greenhouse, as well as to accumulate data on the light exposure of the plants during their growth cycle. Artificial light supplementation in facility agriculture must follow the photophysiological characteristics of plants in order to achieve a better light supplementation effect, so it is necessary to accurately measure the spectral composition and irradiation intensity of the supplemental light source; on the other hand, research on the photophysiological characteristics of plants also needs to accurately determine the incident light.