MADlink 100 Micro Pore Diameter Rapid Measuring Instrument

MADlink 100 Micro Pore Diameter Rapid Measuring InstrumentIt is an optical instrument specifically designed for rapid measurement of the diameter of micropores on thin films, effectively solving the technical problem of traditional optical methods that cannot achieve full inspection of the pore size of thin films using microscopic image processing technology and electron microscopy. Its feature is that all micropores within the entire range of the thin film (maximum area 5.0x4.5mm) can be captured once to output the pore size characteristics, pore size distribution, and pore position distribution map of all micropores on the thin film.

Figure 1: Sample image of microporous sheet

The micro pore diameter of a thin sheet refers to the diameter of small pores on a flat sheet that can reach micrometer or even submicron sizes.

Ordinary optical microscopes are limited by the phenomenon of optical diffraction, and their maximum resolution can only reach around 0.5 μ m. Therefore, measuring micropores of around 1 μ m with ordinary optical microscopes results in significant errors; Moreover, at this time, only microscope objectives with a magnification of 40 times or more can be used, and the field of view size can only reach 0.2mm or smaller. For microporous films made on thin sheets with a distribution range of several millimeters, it is impossible to capture the entire area at once. Even though measuring through partition scanning may take a lot of time and inevitably result in missed detections. If a low magnification microscope objective is used for global imaging measurement, such as 2x, due to the small numerical aperture of the low magnification objective (the numerical aperture of the 2x objective is only 0.06), the diffraction spot (Airy spot) diameter caused by aperture limitation can reach about 10 μ m. Observing micro pores on the order of tens of micrometers with such a lens will produce significant blurring, while for micro pores on the order of 1 μ m, ordinary optical microscope images can no longer reflect the size of the pores. Therefore, measurement systems based on optical microscopy amplification and digital image processing techniques are difficult to achieve rapid and comprehensive measurement of such micro apertures. Although electron microscopes have better depth of field and resolution, they have a smaller field of view for a single measurement and are also very expensive to use, making them less suitable for rapid measurement of micro pore diameter in thin films.

Figure 2: Working principle diagram

MADlink 100 Micro Pore Diameter Rapid Measuring InstrumentThe light flux micro aperture measurement method developed by the Truth Optics team utilizes the proportional relationship between the light flux passing through micropores and the pore area, as shown in the figure below. This effectively avoids the limitation of optical diffraction in optical microscopy imaging methods on the accuracy of micropore size measurement.

Figure 3: Relationship between luminous flux and aperture curve

Based on the light flux values detected by the image sensor for each hole, the micro hole aperture is calculated. At the same time, the light energy loss caused by the optical diffraction of the micro hole itself is corrected to achieve a rapid measurement of all micro hole apertures in the area by capturing the entire micro hole diameter in one go. Finally, the micro hole diameter distribution curve and spatial position distribution map are output.

Figure 4: Typical Analysis Test Report