FS-J1 four-component radiation sensor

发布时间：2024-05-15

Product introduction

The FS-J1 four-component radiation sensor (also known as the four-component net radiation sensor) is used for research level energy balance studies. FS-J1 uses a thermocouple as a sensor to measure solar radiation (short-wave radiation) and far-infrared radiation (long-wave radiation) respectively, and measures net radiation through four sub-radiation sensors, which is a passive sensor. The four output voltage values correspond to the incident and reflected amounts of long wave and short wave respectively, namely, the total incident short wave radiation, the reflected short wave radiation, the downward long wave radiation and the upward long wave radiation.

Based on the above parameters, the short-wave radiation albedo, sky temperature, surface temperature and net radiation can also be calculated indirectly.

The short-wave radiometer is also called the total radiometer, and the long-wave radiometer is also called the Earth radiometer. To calculate sky and surface temperatures, a Pt100 temperature sensor is installed in the Earth radiometer body. To prevent condensation, the Earth radiometer can be heated by a heater connected to the surface body.

The FS-J1 is simple to use, requiring only a four-channel precision voltmeter to obtain readings. The value of the Pt100 temperature sensor needs to be read out only when the sky and surface temperature are required. If a power source is available, users are advised to heat the Earth radiometer at sunrise and sunset.

The FS-J1 four-component radiation sensor is composed of four radiation sensors with independent sensitivity coefficients. In order to calculate the radiation value, it is necessary to divide the voltage U of the sensor output by the respective sensitivity E. We provide the sensitivity E of each sensor.

The FS-J1 requires only simple maintenance to ensure accurate measurements.

Principle of instrument

The most important use of the FS-J1 four-component radiation sensor is to measure the net radiation, which is calculated by measuring the radiation value of the four

components:

Note: The temperature in the following formula uses Kelvin temperature (K), and the conversion relationship between Celsius degree t and Kelvin temperature T is: T≈t+273

SWin=Upyrano,up/Epyrano,up

SWout=Upyrano,down/Epyrano,down

LWin=(Upyrgeo,up/Epyrgeo,up)+5.67 x 10-8 (Tpyrgeo) 4

LWout = (Upyrgeo, down/Epyrgeo, down) + 5.67 x 10-8 (Tpyrgeo) 4

LWnet=Upyrggeo,up/Epyrgeo,up -(Upyrgeo,down/Epyrgeo,down)

SWnet= Upyrano,up/Epyrano,up -(Upyrano,down/Epyrano,down)

NR= SWnet+ LWnet

SW albedo = SWin/ SWout

Tsurface=(LWout/5.67×10-8) ¼

Tsky=(LWin/5.67×10-8) ¼

Instrument structure diagram

Fig.1 FS-J1 four-component net radiation sensor

Total Radiometers (1 & 9), Georadiometers (2 & 7), Protective Cover (3), Biaxial Horizontal Adjustment Bracket (4, 5, 8), Connector (6)

Install

  Technical parameter