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Test method for sheath flow device performance

A test method and sheath flow device technology, applied in the field of sheath flow devices, can solve the problems of high difficulty in performance testing and inability to directly capture tiny particles, and achieve the effect of easy implementation and low cost

Inactive Publication Date: 2019-09-06
上海镭慎光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the sheath flow device is used in a gas flow path such as a dust particle counter, the performance test is more difficult. The main reason is that the particles pass through the light-sensitive area at a relatively fast speed, and the time to pass through the light-sensitive area is about 4 microseconds. The resolution of CCD is thousands of Fps, and it cannot directly capture tiny particles running at high speed, so it cannot directly observe the sheath flow effect with a high-speed camera CCD like a liquid sheath flow device.

Method used

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  • Test method for sheath flow device performance
  • Test method for sheath flow device performance
  • Test method for sheath flow device performance

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Embodiment Construction

[0021] Taking the light scattering dust particle counter as an example, the present invention will be further described in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited by this.

[0022] figure 1 It is a light-scattering particle counter optical sensor with a common air nozzle as the intake channel. Its working process is that the parallel light emitted by the light source component is converged by the cylindrical mirror, focused in the center of the light-sensitive area, passes through the sample gas, and then enters the light trap. When the aerosol particles in the sample gas pass through the photosensitive area, elastically scattered light is generated under the irradiation of excitation light. The scattered light converges to the detection surface of the detector under the action of the collection optical path and is converted into an electrical pulse signal. The pulse amplitude reflects the particle T...

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Abstract

The invention relates to a test method for sheath flow device performance. In the method, particle size distribution errors and highest concentration limits of light scattering particle counters of ato-be-tested sheath flow device, an ordinary air tap with inner diameter of D1 and an ordinary air tap with inner diameter of d are tested, wherein sample flow inner diameter of the to-be-tested sheath flow device is D1, sheath flow inner diameter thereof is D2, and the diameter of a smallest cross section of compressed sheath flow is d; then the performance of the to-be-tested sheath flow deviceis acquired through comparison and analysis. The method has the characteristics of being easy to realize and being low in cost.

Description

technical field [0001] The invention relates to a sheath flow device, in particular to a method for testing the performance of the sheath flow device. Background technique [0002] Sheath flow technology is widely used in flow cytometers, laser dust analyzers, particle size spectrometers and other instruments. It can not only effectively protect the optical components from the contamination of the flow path, but also effectively prevent the overlap of the measured particles in the detection sensitive area. please see Figure 4 , the left picture shows the normal flow path without sheath flow, and the right picture shows the sheath flow flow path. [0003] The sheath flow device was first used in flow cytometry, and the performance test of the sheath flow device is generally observed by a high-speed camera CCD. When the sheath flow device is used in a gas flow path such as a dust particle counter, the performance test is more difficult. The main reason is that the particles ...

Claims

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Application Information

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IPC IPC(8): G01N15/10G01N15/14
CPCG01N15/10G01N15/14
Inventor 张佩鲁晨阳王光辉朱菁黄惠杰
Owner 上海镭慎光电科技有限公司