Solar energy is transformed into heat energy and induces a variation of the temperature of the sensor that allows evaluating the heat flow and the amount of incident energy that causes it. They are based on the thermomechanical properties of a bimetallic tape that is stretched according to the incident solar energy. Depending on the process of conversion of the received energy it is possible to distinguish the following categories: -īimetal sensors. They all include a sensor that converts the received radiant energy into an easily recordable electrical signal. The meteorological instruments designed to measure solar radiation are generally called solar radiometers.
There are no moving parts and it thus requires very little maintenance. The major advantage of this instrument is its simplicity and ease of use. The bands are different for each period of the year.
Each card is marked as to the hour, with local noon being in the center, and is read in tenths. The recording of each day goes onto one card. The sphere is set on a stand and the card is held in place by grooves of which there are three overlapping sets, to allow for the altitude of the Sun during different seasons of the year. It consists of a glass sphere with a diameter of 10 cm designed to focus the sun's rays onto a black card mounted at the back. The simplest of the devices devoted to solar records is the heliograph (Campbell-Stokes recorder). In general, the most detailed information available is beam and diffuse solar radiation on a horizontal surface and, sometimes, the normal beam component can be also found. The best alternative for the design, sizing, and performance evaluation of a solar facility is using registered data. Amaya Martinez-GraciaInmaculada ArauzoJavier Uche, in Solar Hydrogen Production, 2019 5.4 Measurement of solar radiation
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