Detecting method and detecting device for thickness of filter membrane

Abstract

The invention provides a detection method and a detection device for the thickness of a filter membrane. The detecting method comprises the following steps: firstly, obtaining an initial light source exposure picture, and processing acquired image information by LabVIEW software to obtain a grey value of an image; secondly, exposing a standard acquisition filter membrane with known thickness to obtain a light source exposure picture penetrating through the filter membrane; processing by the LabVIEW software to obtain a grey value of an image; obtaining light transmittance of the acquisition filter membrane according to a ratio of the grey values of the two pictures, and further obtaining the relationship between the thickness of the acquisition filter membrane and the light transmittance; changing the color of a light source, selecting the color of a light emitting diode with an optimal effect, calculating the relationship between the standard acquisition filter membrane and the light transmittance, and then judging the thicknesses of other unknown filter membranes according to the relationship. According to the detecting method and the detecting device provided by the invention, by using a photoelectric detection principle, the thickness of the filter membrane can be conveniently and accurately detected, quality management and control by quality inspection personnel are facilitated, and further the quality of a filter membrane product is further improved.

Description

technical field [0001] The invention belongs to the technical field of filter membrane thickness detection, and in particular relates to a detection device and a detection method for particle matter collection filter membrane thickness. Background technique [0002] The main function of the filter membrane is to intercept the particulate matter in the aerosol or solution, and play the role of material separation. The interception and permeation of particulate matter will be directly affected by the thickness of the filter membrane. However, under the influence of filter membrane material, process level and production capacity, there are large differences among filter membranes of various types and manufacturers, and there is no such filter membrane in my country so far. A complete set of technical specifications for filter membrane performance evaluation. At present, commonly used methods for measuring filter membrane thickness include spiral micrometer, scanning electron mic...

AI Technical Summary

Problems solved by technology

The interception and permeation of particulate matter will be directly affected by the thickness of the filter membrane. However, under the influence of filter membrane material, process level and production capacity, there are large differences among filter membranes of various types and manufacturers, and there is no such filter membrane in my country so far. A complete set of technical specifications for filter membrane performance evaluation. Currently, commonly used methods for measuring filter membrane thickness include spiral micrometer, scanning electron microscope, and photometric method.

The advantage of the spiral micrometer is that it can be directly measured and read and the price is low, but the error is large

Using a scanning electron microscope has high measurement accuracy, but the integrity of the filter membrane must be destroyed and the instrument is expensive

For photometric methods so far there is no one that can characterize the relationship between data

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