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The PMA1144 Class II Pyranometer is an ISO-classified second class pyranometer. It is based on the thermopile technology assuring ve broad spectral sensitivity with exceptional flatness and very good long term stability.
The precision optical glass dome on the PMA1144 Analog Class II Pyranometer acts as a filter, with the spectral bandpass that permits the full solar spectrum to pass through to the sensor. The glass dome also protects the sensor from the elements.
The sensor is a high quality blackened thermopile. Heating of the sensor by incoming solar radiation produces a signal in the µvolt range. Each Class II pyranometer has its own calibration factor. Along with the processing algorithm, it is programmed into a memory chip embedded into the sensor.
Thermopile type radiation sensors exhibit the widest and most uniform spectral response. It is limited mostly by the spectral transmission of the dome. They are useful to monitor the total radiant power or solar radiation as well as artificial sources. The sensitivity of these types of sensors is somewhat limited and measurements of radiant flux below 10 W/m2 are difficult.
Due to almost ideal flatness of the spectral response the Class II pyranometer is often used with a set of low wavelength blocking filters in order to measure radiant power distribution in various bands. The difference between the total power and the power measured with the filter is the radiant power in the band blocked by the filter. A correction that accounts for energy reflected from the filter’s surface is necessary.
In solar radiation studies the diffuse component of the total radiant flux can be measured by using a shadow-band casting a shadow on the pyranometer’s entrance. The difference between the total power and the diffuse power measured with shadow-band is the direct component. For better accuracy a correction should be made for the part of diffuse radiation obstructed by the shadow-band itself.
Measuring full spectrum radiation from 280-2800nm for atmospheric, PV cell research and laboratory studies
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