Drop shape analysis is based on image analytical technology, which is used for measurement of sessile drop (captive bubble method) based contact angle or pendant drop/sessile drop method based surface/interfacial tension. So, camera is obligate for contact angle measuring in drop shape analytical method based interfacial tensiometer. There are a variety of cameras with different resolutions on the market, such as 0.4 Megapixels (756*576), 1.3 Megapixels (1280*1024) and 10.1 Megapixels (3840*2748) , etc.. But which resolution do we really need for measurement of contact angle and surface tension?
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