The total solar radiation sensor also called pyranometer, which can be used to measure the total radiation value under sunlight.
What is total solar radiation?
The total solar radiation refers to the energy that the sun transmits outward in the form of electromagnetic waves, and the electromagnetic waves and particle streams that the sun emits to the universe. The energy transferred by solar radiation is called total solar radiation energy.
The working principle of total radiation sensor
The working principle of the total radiation sensor is based on the thermoelectric effect. The sensing element is composed of a sensing surface and a thermopile. The sensing element is a fast-response wire-wound electroplating thermopile, and the sensing surface is coated with 3M matt black paint. When the black-painted sensing surface receives radiation heating, it is called a hot junction, and the unpainted side is called a cold junction. When there is sunlight, a thermoelectric potential is generated. Illumination is proportional.
What is the structure of the total radiation sensor?
For example, the composition of the pyranometer is as follows: the induction core of the pyranometer is composed of high-precision thermopile elements, and the induction element is coated with an inorganic carbon film with high stability and high absorption rate. The sensing element is equipped with a two-layer quartz glass (corresponding wavelength range 0.3-3μm) cover made of precision optical cold processing to prevent the influence of the environment on its performance. Sensor integrated level reference, reusable dryer, white visor.
Thermoelectric solar radiation sensor VS Photoelectric solar radiation sensor
Thermoelectric solar radiation sensor
Using the thermoelectric principle, it can be used to measure solar radiation in the spectral range of 0.3~3μm. The induction element adopts a wire-wound electroplating thermopile, and the induction surface is a black layer with high absorption rate. Using the thermal effect of radiation, solar radiation is absorbed and converted into thermoelectric potential. And it has temperature compensation function, which can measure the amount of solar radiation more accurately.
Photoelectric solar radiation sensor
The photoelectric solar radiation sensor adopts the photoelectric principle and can be used to measure the solar radiation in the spectral range of 0.3~3μm. High-precision photosensitive element, wide spectral absorption, high absorption in the full spectral range, and good stability.
Total solar radiation sensor application
Since the energy emitted and transmitted by the sun is mainly concentrated in the radiation in the wavelength range shorter than 4 μm, the sensor used to measure the solar radiation energy of this wavelength is called the total solar radiation sensor.
The total solar radiation sensor can be used to measure the total solar radiation in the spectral range of 0.3 to 3 μm. If the sensing surface is downward, it can measure the reflected radiation, and it can also be used to measure the solar radiation incident on the inclined surface. For example, adding a shading ring can measure the scattered radiation.
It is widely used in meteorology, solar energy utilization, agriculture, building material aging and air pollution to measure solar radiation energy.
