Net radiometer

1.Net radiometer product overview

Net radiometers are used for routine measurements of net radiation, accurately measuring the difference between the radiation at the Earth's surface and the radiation reflected from the ground.Net radiometer is used to measure the net difference between the amount of radiation projected from the sky and the earth's surface projected upward.The measurement range is 0.3 to 3 microns short-wave radiation and 3 to 100 microns earth radiation.It is applied to the calculation of soil moisture evaporation and transpiration and the study of building mechanisms related to thermal equilibrium.

Net radiometer is widely used in agricultural meteorology, calculation of total soil moisture evaporation and transpiration losses, crop disaster prevention and thermal balance related construction mechanisms.

2.Net radiometer product features

1.Low cost and high cost performance.

2.Suitable for all kinds of harsh environments.

3.Passive accurate measurement.

4.High sensitivity.

5.Dual output signals of analog and digital quantities.

6.Convenient use and operation and maintenance.

3.Net radiometer application occasions

1.Research on agricultural and forestry ecology.

2.Calculate the total amount of soil moisture evaporation and transpiration loss.

3.Crop disaster prevention.

4.Research on building mechanisms related to thermal equilibrium.

4.Net radiometer working principle

The working principle of Net radiometer is the thermoelectric effect.The induction part is a thermopile composed of copper-plated Conco copper wire.The thermopile is coated with imported high-absorbent matte black coating.The two thermopiles receive solar radiation and earth radiation respectively.Due to the different radiation absorbed by the upper and lower induction surfaces, temperature differences occur at both ends of the thermopile, and its output electromotive force is proportional to the irradiance difference received by the induction surface.

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 wind and rain from affecting the output of the radiation meter and protect the sensing surface.The output radiation amount (W/m2) = measurement output voltage signal value (μV) ÷ sensitivity coefficient (μV/W•m-2).Each sensor gives the calibrated sensitivity coefficient respectively.

5.Net radiometer technical indicators