MULTIPLE VELOCITY AEROSOL SAMPLING INLETS TO CONFORM

多速气溶胶采样入口以符合要求

• 批准号: 2424401
• 负责人: Judy Qiuju Xiong
• 金额: $ 9.7万
• 依托单位: JQX LAB
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-30 至 1999-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2424401
• 关键词: aerosols; air sampling /monitoring; biomedical equipment development; occupational hazard

The primary objective of the current proposal is to develop new aerosol sampling inlets. These inlets, using an entirely new concept, will comply with size-selective aerosol sampling criteria better than the inlets currently being used. It is recognized that a better evaluation of the hazard is possible if particles which do not contribute to the hazard are excluded from the airborne mass concentration analysis. The criteria for inhalable, thoracic and respirable fractions of airborne particles, proposed by Soderholm (1989) for this purpose, have recently been adopted by ACGIH, CEN and ISO. However, it is difficult to sample aerosols in the workplace according to the revised criteria because of unsatisfactory performance characteristics of existing sampling inlets. The proposed inlets for both personal and stationary sampling will be developed using well established aerosol inertial impaction theory and unconventional structure. A prototype array of single stage impactors with different jet velocities will be developed in the Phase I study. The new inlets will not only provide much better overall cut-characteristics to comply with the revised criteria, but also will be simple, inexpensive, and easy to operate. Furthermore, the final modification and optimization of the inlet design using experimental results will lead to compact products which can be operated in a very dusty environment over a full work shift without degradation of performance due to overloading.

当前提案的主要目标是开发新的气雾剂 取样入口 这些进气道采用了全新的概念， 尺寸选择性气溶胶采样标准优于入口 目前正在使用。 人们认识到，更好地评价 如果不造成危害的颗粒 从空气质量浓度分析中排除。 的标准 可吸入、胸腔和可呼吸的空气中颗粒物， Soderholm（1989）为此目的提出的，最近被 ACGIH、CEN和ISO采用。 但是，很难抽样 根据修订后的标准， 现有取样入口的性能特征不令人满意。 个人和固定采样的拟议入口将是 使用完善的气溶胶惯性碰撞理论开发， 非常规结构。 具有不同射流速度的单级冲击器原型阵列 将在I期研究中开发。 新的入口不仅将 提供更好的整体切割特性， 修订后的标准，但也将是简单的，廉价的，易于 手术。 最后对进气道进行了改进和优化 使用实验结果的设计将导致紧凑的产品， 可以在满负荷工作的灰尘环境中操作 而不会由于过载而降低性能。