A light amount control technique in absolute spectroradiometry

<正> It is demonstrated that by making use of the excellent stability and broad dynamic range of silicon photodiodes the influence of instability of light sources on the intercalibration of detectors can be greatly minimized with the light amount control technique. In consequence, different kinds of unstable light source and various absolute types of detector can.be applied to spectroradiometry and the accuracy of the measurements will not be affected by instability of light sources.