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An aspirating smoke detector (ASD), consists of a central detection unit which draws air through a network of pipes to detect smoke.〔(【引用サイトリンク】title=Aspirating Smoke Detectors (ASD) )〕 The sampling chamber is based on a nephelometer that detects the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber. ASDs can typically detect smoke before it is visible to the naked eye. In most cases aspirating smoke detectors require a fan unit to draw in a sample of air from the protected area through its network of pipes, such as is the case for Wagner, Safe Fire Detection's ProSeries and Xtralis ASD systems.〔(【引用サイトリンク】title=VESDA Systems ) 〕 ==History== In 1970 the Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO) used a nephelometer to carry out research into forest fires. Subsequently, the Australian Postmaster-General's Department (later becoming Australia Post and Telstra) engaged the CSIRO to investigate technologies that could prevent service interruption due to fire. After selecting a sample site to carry out research, the CSIRO suggested that the nephelometer should be used as the benchmark for the APO fire tests. This was installed to monitor smoke levels within the return-air ducts of the mechanical ventilation system, utilising a chart-recorder output display. At the conclusion of several weeks of testing, it was discovered that there no commercially available fire detection technology suitable for preventing damage to telephone equipment. One technology that did show great promise however was the nephelometer itself.〔(【引用サイトリンク】title=The HISTORY of VESDA and MONITAIR )〕 In 1979, Xtralis, then IEI Pty Ltd., produced and sold an air sampling device they called VESDA (Very Early Smoke Detection Apparatus). The company redesigned the detector in 1982 to provide the reliability, features, size and reduced cost for export markets. There are more than 1.5 million fires annually in the USA, according to the Society for Fire Protection Engineers. Fires result in an estimated $10 billion in property loss each year, the organization reports. ASD systems have gained popularity due to their ability to sense smoke long before a catastrophic incident. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aspirating smoke detector」の詳細全文を読む スポンサード リンク
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