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An examination of a prototype LED fire alarm signaling appliance

机译：检查原型LED火警信号装置

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Since the introduction of the Americans With Disabilities Act in 1990, the number of visual fire alarm signals installed in the United States has grown exponentially. Virtually all of these fire alarm visual signals consist of the Xenon gas fiashtube type. This technology offers high intensity along with moderate cost in a relatively small package. Typical intensities offered range from 15cd (candela) up to 185cd. With the recent advances in solid state LEDs (Light Emitting Diodes) the possibility exists to develop visual fire signals using this technology. When used in lower intensity visual appliances, LEDs offer comparable light output with much smaller optical footprints (albeit at somewhat higher estimated costs). This paper will examine the optical performance of a prototype LED visual fire signaling appliance as compared to a more conventional device. It will also evaluate a series of tests, which were run in an office environment to compare the response time of workers for both the conventional Xenon fire signal appliance as well as the prototype LED device. Measurements for each test subject were taken over a two to three day period. Parameters measured included time of day, size of office and general ambient lighting. Results of these experiments indicate that the general response times of the test subjects were similar for the two types of fire signals. The paper concludes with a discussion of the potential for LED-type fire signaling devices as well as some of the potential technology obstacles still to be overcome.
机译：自1990年实施《美国残疾人法案》以来，在美国安装的可视火灾报警信号的数量呈指数增长。实际上，所有这些火灾报警视觉信号都由氙气灯管组成。该技术以相对较小的封装提供高强度以及适中的成本。提供的典型强度范围从15cd（坎德拉）到185cd。随着固态LED（发光二极管）的最新发展，存在使用这种技术产生视觉火警信号的可能性。当用于强度较低的视觉设备时，LED可提供可比的光输出，且具有较小的光学足迹（尽管估算成本略高）。本文将研究与更常规的设备相比，原型LED视觉火灾信号装置的光学性能。它还将评估一系列测试，这些测试在办公室环境中进行，以比较工人对传统氙气火警信号设备以及原型LED设备的响应时间。在两到三天内对每个测试对象进行测量。测量的参数包括一天中的时间，办公室的大小和一般环境照明。这些实验的结果表明，对于两种类型的火灾信号，测试对象的总体响应时间是相似的。本文最后讨论了LED型火警信号装置的潜力以及一些尚待克服的潜在技术障碍。

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