Net radiometer

1.Net radiometer product overview

Net Radiometers are instruments used to measure net radiation, primarily for energy balance and surface flux studies.A Net radiometer is used to measure the net difference in the full-band radiation projected downward from the sky and upward from the Earth's surface.The measurement range is shortwave radiation from 0.3 to 3 microns and earth radiation from 3 to 100 microns.It is applied to the calculation of soil moisture evapotranspiration and the study of building mechanisms related to heat balance.

Net radiometer is widely used in agricultural meteorology, total soil water evapotranspiration loss calculation, crop disaster prevention and thermal balance-related construction mechanism research.

2.Net radiometer product features

1.Low cost and high cost performance.

2.Suitable for various harsh environments.

3.Passive accurate measurement.

4.High sensitivity.

5.Dual output signals of analog and digital quantities.

6.Easy to use, operate and maintain.

3.Application occasions of Net radiometer

1.Agricultural and forestry ecological research.

2.Calculation of total soil water evapotranspiration loss.

3.Crop disaster prevention.

4.Research on building mechanisms related to thermal balance.

4.Working principle of Net radiometer

The working principle of the Net radiometer is the thermoelectric effect.The sensing part is a thermopile composed of copper-plated constantan wire.The thermopile is coated with an imported high-absorption matte black coating.The two thermopiles receive solar radiation and terrestrial radiation respectively.Due to the different radiance absorbed by the upper and lower sensing surfaces, a temperature difference occurs at both ends of the thermopile, and its output electromotive force is proportional to the difference in irradiance received by the sensing surface.

The Net radiometer is equipped with a hemispherical special polyethylene film cover that can transmit short-wave radiation (0.3 to 3 microns) and long-wave radiation (3 to 100 microns) to prevent the influence of wind and rain on the output of the radiometer and protect the sensing surface to output radiation.Quantity (W/m2) = measured output voltage signal value (μV) ÷ sensitivity coefficient (μV/W·m-2).Each sensor gives a calibrated sensitivity coefficient.

5.Net radiometer technical indicators