The TEL301 is used for making radiance and radiant intensity (or luminance and luminous intensity) measurements from displays and reflecting surfaces. The optics in the TEL301 telescope produce an image of the source at a mirrored surface. The user, looking into the eyepiece, sees the image with a black spot corresponding to a hole in the mirrored surface.
The light which passes through the hole is transmitted either directly to a monochromator or into a flexible light guide. The fact that the source is imaged at the hole ensures that only light from the area covered by the spot seen by the viewer is measured.

The direct entrance optic is a special designed telescope which allows the study of the direct irradiance of the solar radiation. It has a weatherproof housing and is designed for use with a quartz fibre. The optic has a field of view of about 1.5°. The outer dimensions allow easy mounting on common solar trackers.
The calibration can be done by applying the KS-J1011 portable spectral irradiance source and the appropriate adapters (KS-J1011-ADAPT-GLO + KS-J1011-ADAPT-DIR).

Direct entrance optic like J1004 with an internal SMA light guide for easy mounting to user defined systems. The optic has a field of view of about 1.5°. The outer dimesion of the optic allows the fitting to common used solar trackers.

Direct entrance optic like J1004 with an internal narrowand detector. The optic has a field of view of about 1.5°. The outer dimesion of the optic allows the fitting to common used solar trackers.