The Use of Hypodermic Needles as Critical Orifices in Air Sampling
The Use of Hypodermic Needles as Critical Orifices in Air Sampling
复制标题
使用皮下注射针作为空气采样中的关键孔口
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
G. A. Swanson
中科院分区：
文献类型：
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作者：
J. Lodge;J. B. Pate;B. E. Ammons;G. A. Swanson
皮下注射针是有用的，作为方便的低成本的关键孔，以控制空气采样中的流速。对于41种针标距长度组合，流速变化小于5%。为了提供最大的准确度，一个简单的校准程序。如果有保护措施，针头可重复使用6次以上。描述了保护器的类型。电阻的保护器，收集器，和预过滤器组合影响临界在9升/分钟。简单的采样装置使用针作为孔进行说明。
Hypodermic needles are useful as convenient low-cost critical orifices to control the flow rate in air sampling. Variations in flow rate were less than five per cent for 41 needle gauge-length combinations. To provide maximum accuracy, a simple calibration procedure is described. Needles may be reused more than six times, if protected. Types of protectors are described. Resistances of protector, collector, and prefilter combinations affect criticality at nine liters/min. Simple sampling devices using needles as orifices are described.