Patent ID: 8390815
Filing Date: 2013-03-05
Classification: G01N

Abstract:
1. An surface tension measuring device, comprising: an optical fiber probe having a first end face, at least part of which being inclined with respect to a direction perpendicular to a fiber axis; light-supplying means for supplying light from a second end face on the side opposite the first end face of the optical fiber probe; reflected light amount measuring means for measuring the reflected light amount when the light supplied by the light-supplying means is reflected by the first end face and returned to the second end face; and moving means for moving at least one of the optical fiber probe and an object to be measured so that the first end face of the optical fiber probe passes at a constant speed through an interface of the object to be measured, wherein the surface tension of the object to be measured is acquired based on the time change of the reflected light amount when the first end face of the optical fiber probe passes through the interface of the object to be measured.