Knowledge

Solar Radiation Measurement: Solarimeters and Pyranometers

Solar Radiation Measurement: Solarimeters and Pyranometers

An overview on solar radiation measurement sensors The Sun’s surface, called the photosphere, is at a temperature of about 6000K and its behavior approximates that of a “black body” . Considering this, it is possible to calculate the total power emitted by the Sun : it is approximately 9.5×10^25W. The total power emitted by the Sun […]

Difference between “Calibration” and “Adjustment”

Difference between “Calibration” and “Adjustment”

The National Physical Laboratory give a clear definition about these differences: Calibration is defined as a set of operations that establish, under specified conditions, the relationship between the values of quantities indicated by a measuring instrument or measuring system … and the corresponding values realised by standards. Sometimes, however, the word calibration is misused to […]

A comparison between PV Cell and Thermopile Pyranometers on field measures

A comparison between PV Cell and Thermopile Pyranometers on field measures

The Thermopile Pyranometer A thermopile pyranometer is capable of picking up the whole of the solar spectrum that arrives on Earth’s surface, from the ultra-violet (UV) to the far infra-red (FIR). This can be seen in Fig. 1, where the yellow area represents the reference solar spectrum. This peculiarity allows the pyranometer to carry out […]

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