Design and fabrication of a silicon photodiode-based pyranometer

Date

7-2016

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Electronics Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Adrian Augusto M. Sumalde

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The study was focused on the design and fabrication of a silicon photodiole-based pyranometer which measures irradiance data. A BPW21-R photodiode sensor was used for light metering which was enclosed in a black polypropylene case and attentuated by a polytetrafluoroethylene (Teflon) diffuser. An LM35 temperature sensor was incorporated to monitor the photodiode temperature. The output of the pyranometer was recorded using a GizDuino 5 microcontroller. The constructed silicon-photodiode-based pyranometer was calibrated against a LI-COR 200SA reference pyranometer using the International Standard 9847:1992. The calibration factor obtained was 0.770 with a 4% error and it can be concluded that the obtained irradiance values using this factor are precise since they do not have a significant mean difference with the LI-200SA irradiance values. The fabricated pyranometer was then subjected into performance error teests, namely, cosine error test, responsivity and nonlinearity error test. Based on the test results, two Teflon diffusion layers can be used to have a cosine error up to 75° zenith angle. The nonlinearity error of fabricated pyranometer does not exceed the limit of 1% with a responsivity of approximately 50 μA at 1000 W/m². In general, it can be concluded that the performance of the constructed pyranometer is comparable to that of the LI-200SA pyranometer. However, other tests (e.g. stability, tilt response, etc.) are still recommended to further improve device and precision.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2016 E64 /D45

Document Type

Thesis

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