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Spectro-Radiometer

Gonio-photometer | Integrating sphere | Power analyzer | Spectro-radiometer

The spectro-radiometer is used to measure the light output of a light source at each wavelength. The part that looks like a video camera (to the far right in the picture) can look at each wavelength separately. The spectro-radiometer can also be used as a standard light meter and measure all visible wavelengths at once to obtain the total light output of a source.

The console portion of the spectro-radiometer is used to display the meter readings and also to adjust measurement settings like the sensitivity.

The computer is interfaced with the spectro-radiometer and is used to send commands to the machine and receive, store, and analyze the data.

We usually use the spectro-radiometer in conjunction with an integrating sphere. We put the lens of the camera portion of the spectro-radiometer in place of where a light meter's sensor head usually goes (see the topic on integrating spheres). The spectro-radiometer can also be used without an integrating sphere. In this case, we just point the camera lens at the light source and take a measurement.

The picture below shows the sort of output we can obtain from the spectro-radiometer. The graph shows the illuminance level at each visible wavelength. The spectro-radiometer can also measure a limited range of near-IR and UV wavelengths.