Rotating shadowband pyranometer

Details Rotating shadowband pyranometer Rotating shadowband pyranometer

2005-02-01

2005-02-01

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C356S218000, C126S573000

Reexamination Certificate

active

06849842

ABSTRACT:
A pyranometer for measuring solar irradiance at a selected site comprises a light detector adapted to produce an output signal in response to incident solar radiation, a reversible motor having a curved shadowband attached to its output shaft, means for mounting the light detector and motor so that the shadowband is at a fixed distance from the light detector; and a motor controller that is adapted to periodically cause the motor to rotate the shadowband from one to the other of two limit positions, with the shadowband acting to momentarily shadow the light detector during its movement between its two limit positions. A datalogger stores and processes the light detector's signal output to provide a measure of total horizontal, direct normal and horizontal diffuse solar irradiance.

REFERENCES:
patent: 4168124 (1979-09-01), Pizzi
patent: 4218139 (1980-08-01), Sheffield
patent: 4253764 (1981-03-01), Morrill
patent: 4320288 (1982-03-01), Schlarlack
patent: 4430000 (1984-02-01), Eldering et al.
patent: 4491727 (1985-01-01), Appelbaum et al.
patent: 4588295 (1986-05-01), Eldering et al.

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