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Aerosol particle sensor with axial fan

一种传感器、风扇的技术，应用在气流系统领域，能够解决没有成本优势、不可能所有采样位置实时监测等问题，达到降低成本、系统装置简化的效果

Inactive Publication Date: 2009-05-13
PARTICLE MEASURING SYST
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Problems solved by technology

Another major disadvantage of this method is that only one sampling point can be evaluated at a time; therefore, real-time monitoring of all sampling locations is not possible
[0003] The second common method requires the use of dedicated particle counters at each required sampling point
So, although these systems provide continuous monitoring and do not require massive airflow systems, there is still no cost advantage to utilizing these types of blowers in a multiparticle sensor system

Method used

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  • Aerosol particle sensor with axial fan
  • Aerosol particle sensor with axial fan
  • Aerosol particle sensor with axial fan

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Embodiment Construction

[0028] In this disclosure, the term "light" is not limited to visible radiation, but is used in a broad sense to refer to any electromagnetic radiation, including infrared, ultraviolet, extreme ultraviolet and x-ray radiation. It should be noted that the particle sensors and particle counters disclosed in this specification are designed to detect free single particles in a flowing gas, which distinguishes them from the detection and analysis of particles in the gas itself, in a cloud of particles suspended in a gas, or in a gas In other systems such as confined particles that are constrained to flow in a line through a beam of light. Those of ordinary skill in the art will recognize that detecting and determining the size of free-flowing single particles in gases is a much more difficult task, especially for particles less than 1 micron in size; Different technologies than analysis systems.

[0029] Aerosol counter or sensor instruments utilize high static pressure fans or co...

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Abstract

A particle sensor (106) for optically detecting an unconstrained particle suspended in a flowing gas includes a sample chamber (135) having a gas inlet (115) and a gas outlet (162); a gas flow system (120) for flowing said gas from said gas inlet through said sample chamber to said gas outlet, a source (134) of light; an optical system (310, 319) directing said light through said sample chamber, an optical collection system (330) located to collect light scattered by said particles in the gas, and a detection system (340) located to detect the collected light. The total pressure drop through said gas flow system is 3 inches of water or less. The gas flow system includes an axial fan (128), which may be a high static pressure fan or a counter-rotating fan. In a 1.0 CFM system, the gas inlet nozzle (130) has an area of 25 square millimeters or more.

Description

technical field [0001] The present invention relates generally to systems for detecting unwanted single particles in gases using the principle of light scattering, which systems are commonly referred to in the art as optical particle counters, and more particularly to gas flow systems in such particle counters . Background technique [0002] It is well known that in industries such as high-tech electronics and pharmaceutical manufacturing, it is necessary to prevent contamination by small particles. This need has led to the development of optical particle counters in which a fluid flows through an optical sensor that detects the presence of contamination particles. Particle counters that detect particles in air or other gases are sometimes referred to as "aerosol counters." Standards generally require that an aerosol counter monitor the total volume of gas flowing through the sensor. Particle counters that monitor the total volume of gas flowing through the sensor are kno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
CPCG01N2001/245G01N2001/2223G01N15/1459G01N2015/1493G01N1/2273G01N2015/1486G01N2001/244G01N15/0205
Inventor T·贝茨
Owner PARTICLE MEASURING SYST
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