Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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J.G. Boswell基金会，1947年由J.G. Boswell公司创始人James Griffin Boswell创立，这家公司是全球最大的私营农场之一，主营皮马棉花、西红柿等作物，耕地面积达13.5万英亩。基金会的使命涵盖农业、教育、健康等多个领域，1960年代的120万美元匹配赠款，不仅帮Sun City建成了第一家医院，还通过“居民匹配资金”的模式，增强了社区的归属感。