一、前言在《照度计检定规程》中,规定余弦修正器的角度响应误差是照度计的一项重要技术指标,但只是简单地提到了测试原理。本文就如何保证照度计测试面的垂直中心转轴与转台转轴一致,同时又要保证测试面和标准灯的灯丝平面都垂直于光轨等问题作了如下探讨,供参考。二、测量原理当光以不同的角度照射到照度计的光接收表面时,其照度值读数应与入射角的余弦成比 I. Preface In the Verification of Illuminance Meter, the angle error of the cosine corrector is an important technical indicator of the meter. However, it simply refers to the test principle. This article on how to ensure that the test surface of the illuminometer vertical center axis of rotation consistent with the turntable, but also to ensure that the test surface and the standard lamp filament plane perpendicular to the track and other issues are discussed below for reference. Second, the measurement principle When light at different angles to illuminate the light receiving surface of the meter, its illumination readings should be proportional to the cosine of the incident angle