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MONITORING CONCENTRATION OF THE SOLUTION BY REFRACTOMETER MEASUREMENT

1/ DIGITAL MEASUREMENT PRINCIPLE The light source sends light to the interface between a prism and the process solution, where the rays meet the surface at different angles. Depending on the angle, some rays reflex a total internal reflection, while the rest of the light is refracted during processing stage. Thus, an optical image with …

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(Tiếng Việt) Van chân không (Vacuum Isolation Valve), tại sao lại gọi là van chân không ?

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What is a clean room? Clean room system according to standards

In 1963, for the first time, “clean room standards” were regulated in the US. Since then, this standard has been gradually improved, perfected and become a common standard for the whole world, applied in many different fields. Cleanrooms are usually specified and classified according to Federal Standard 209 E, ISO 14644-1 and national standards TCVN …

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