Pyranometer, Solar Radiation Sensor for Weather Station
thingiverse
Photodiode-based pyranometer with pole mount is inspired by David Brooks' design from Instesre.org. The sensor comprises a photodiode (Advanced Photonics PDB-C139), 470 ohm shunt resistor, and 1mm Teflon diffuser. ABS printed parts are made using an Airwolf3d printer with a 0.5mm nozzle and 0.2mm layer height. A 1mm-thick self-adhesive Teflon sheet is used for the diffuser, avoiding adhesive installation. The sensor's bubble level is 14mm in diameter, sourced from eBay. 6-32 machine screws mount the sensor to a lower plate, while a 1-3/8" inner spacing u-bolt is used for pipe mounting. When calibrated against Apogee and Li-Cor commercial pyranometers, calibration multipliers range between 3.3 and 3.6 W/m2 per mV. However, it shows cosine error at large zenith angles, underestimating global irradiance in winter and northern latitudes. Further designs are in development.
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