Low Cost Active End-of-Service-Life Indicator for Respirator Cartridges

项目摘要 在职业环境中佩戴空气净化呼吸器是为了防止呼吸危害，包括有毒的。 蒸汽和气体。不幸的是，在此之前，用户通常不知道何时更换盒 突破就会发生。因此，必须集成使用寿命终止指标(ESLI)系统 使用呼吸器滤芯，在需要更换滤芯时向使用者发出警告。当前面临的挑战 正在开发的ESLI系统包括湿度以及选择性、大小、重量和功率的影响 限制。此外，制造商倾向于将传感器成本限制在每个墨盒1美元左右，每个墨盒20-50美元 与传感器相关的夹具和电子产品。只有有限数量的色度型无源ESLI在商业上 可用，并且它们依赖于颜色变化的主观视觉识别。用户必须定期监控 颜色变化传感器，这会分散他们的工作注意力。没有活动的ESLI是NIOSH批准的。智能光纤 系统公司(IOS)建议通过结合敏感光纤来开发低成本的有源ESLI系统 进入呼吸盒以监测污染物；当发生以下情况时将触发声音/视觉警报 墨盒达到90%的饱和度。

Project Summary Air-purifying respirators are worn in occupational settings to protect against respiratory hazards, including toxic vapors and gases. Unfortunately, the user generally does not know when to change the cartridge before breakthrough occurs. It is therefore essential to have an end-of-service-life indicator (ESLI) system integrated with the respirator cartridge to warn the user when it is time to change cartridges. Current challenges in developing ESLI systems include the effects of humidity, as well as selectivity, size, weight, and power restrictions. Additionally, manufacturers prefer to limit sensor costs to about $1 per cartridge, and $20–$50 for sensor-related fixtures and electronics. Only a limited number of colorimetric passive ESLIs are commercially available, and they rely on subjective visual identification of a color change. Users must routinely monitor the sensor for color change, which distracts from their work. No active ESLI is NIOSH-approved. Intelligent Optical Systems, Inc. (IOS) proposes to develop a low cost active ESLI system by incorporating sensitive optical fibers into the respiratory cartridge to monitor for contaminants; an audible/visual alarm will be triggered when the cartridge reaches 90% saturation.