发光二极管（LED）的光强空间分布特性决定了它能否满足特定场合的应用。大功率LED 由于发热量大，其绝对光强空间分布(LISD)的测试也必须在特定热沉温度下进行才能得到准确可靠的结果。设计了一个可对大功率LED 进行热沉温度控制且快速实现LISD 自动测试的系统。该自动测试系统基于LEDGON-100 测角光度计及其高精度的二维旋转台，配合测试适配器、温度控制器、光度探头、Keithley 2400 源表和测试软件组成。测试软件基于Delphi 程序语言开发。在控温条件下，该LISD 自动测试系统稳定可靠，测试时间大大缩短，测试结果实时直观。利用该自动测试系统对具有朗伯型和蝙蝠翼型两大LISD 类型的LED 进行测试,获得它们的二维LISD 和三维LISD。实验结果表明：随着热沉温度的增加，光强绝对值下降，而相对LISD 却不变。

Characteristics of the luminous intensity spatial distribution (LISD) of light emitting diodes (LEDs) are capable of determining whether these devices can be applied on specific occasions. The absolute LISD of high power LED can be accurately measured only when LED is fixed at a specific heat- sink temperature because of the LED′s large heat-generating capacity. In this study, an automatic test system based on LEDGON-100 goniophotometer and the meter′ s high- precision two- dimensional (2D) revolving platform, is designed. In addition, it comprises of a test adapter, a temperature controller, a photometer head, a Keithley 2400 source meter, and an in- house- developed software package. This assembly can both control heat- sink temperatures and measure the LISD characteristics rapidly for high- power LEDs. The software is developed using Delphi programming language. The test system is stable and reliable. The test time is greatly reduced and measurements are instantly displayed.Two general types of LEDs, Lambertian type and batwing type, are measured by the system to obtain their 2D and three- dimensional (3D) LISDs. Experimental results show that the absolute luminous intensity decreases as the heat- sink temperature increases. However, the relative LISDs are the same under different heat-sink temperatures.