Apogee Instruments S2-431 Owner's Manual - Page 8

Browse online or download pdf Owner's Manual for Accessories Apogee Instruments S2-431. Apogee Instruments S2-431 18 pages. Red - far-red sensors

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Cosine Response

Spectral Response

Directional, or cosine, response is

defined as the measurement error at a

specific angle of radiation incidence.

Directional error for Apogee S2 series red

- far-red sensors is approximately ± 2 %

and ± 5 % at solar zenith angles of 45°

and 75°, respectively.

Mean spectral response

measurements of six replicate red -

far-red sensors (red sensor is centered

near 655 nm, far-red sensor is

centered near 730 nm). Spectral

response measurements were made

at 2 nm increments across a

wavelength range of 600 to 800 nm in

a monochromator with an attached

electric light source. Measured

spectral data from each sensor were

normalized by the measured spectral

response of the

monochromator/electric light

combination, which was measured

with a spectroradiometer.