Description

This Technical Report outlines procedures for determining the spectral responsivity function of photodetectors. It contains two parts: 

1. Determination of the relative spectral responsivity function
Various methods are presented and instrumental details are discussed. Sources of errors are listed together with diagnostic tests and proposals for remedial action.

2. Absolute calibration
Three different methods are presented for transforming relative spectral data into absolute values. 

The report is intended to serve as a guide in assembling, testing, or modifying new or existing instruments. Its purpose is to describe options in the development of instrumentation, not to present solutions for individual cases. 

The report consists of 73 pages and 10 figures.

Description

The CIE and other organizations have conducted international comparisons of measurements of the spectral power distribution of light sources, including fluorescent tubes. In these comparisons, some unexpectedly large differences were found between the results reported by different laboratories. CIE specialists concluded that before further large-scale international comparisons of measurements are organized, a method (or a few basic methods) should be agreed upon that would result in better accuracy and, hence, closer agreement between the measurements of participating laboratories. International agreement on such methods would also serve as a guide in setting up new spectroradiometric laboratories. 

The first part of the report covers, in a general way, the use of a spectroradiometer for measuring the spectral power distribution of light sources, with particular reference to the determination of photometric and colorimetric properties. 

The second part relates to the measurement of individual lamp types, particularly tubular fluorescent lamps. The report is designed to assist workers in industrial standards laboratories, but is not intended for use as a textbook. 

The report consists of 61 pages and 8 figures.