The Middleton ASR-02 Absolute Spectral Radiometer is a portable reference standard for the field calibration of sunphometers such as the Middleton Solar SP02 and SP02-L. The ASR-02 contains three types of pyrheliometer sensors axially aligned in a sealed enclosure. The three sensors operate simultaneously, in conjunction with a selection of filters, to allow an absolute measurement of solar spectral irradiance. The sensors can also operate independently, or in any combination, for spectrometer, sunphotometer, or pyrheliometer type measurements.

 

Sensor Specification

Sensor type 1	fiber-optic spectrometer (CCD Spectro-Pyrheliometer).
Sensor type 2	wide-band thermopile (DN5-S Pyrheliometer).
Sensor type 3	narrow-band photodiode (Photodiode Pyrheliometer).

 

PORTABLE REFERENCE FOR SUNPHOTOMETER CALIBRATION

Temperature outputs for thermal response correction.

Eight-position filter wheel (open; aureole; five filters; blocked).

Marine-grade aluminium body, hard anodised & powdercoated.