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一、引言通常用充气型白炽卷丝钨灯作为光强标准灯。为了使它体现标准光 A,一般都在2856开分布温度下点燃。用这样的光强标准灯做成的标准器有下述缺点:1.在测光方向的光分布不好;
I. INTRODUCTION Inflatable incandescent tungsten filament lamp is usually used as light intensity standard lamp. In order to make it reflect the standard light A, are generally 2856 open distribution temperature ignition. Standard light made with such a light intensity standard has the following disadvantages: 1. The light distribution in the metering direction is not good;