Patent ID: 8735856
Filing Date: 2014-05-27
Classification: G01F

Abstract:
1. A hollow prism for detecting liquid level in the presence of an optical beam, comprising; a hollow member with a suitable geometry, a first planar surface disposed at proximal end of said hollow member, wherein said first planar surface disposed normal to geometrical axis of said hollow member, a second planar surface disposed at distal end of said hollow member and at an inclined angle ‘α’ to said first planar surface, a first dielectric member sealed to said first planar surface, a second dielectric member sealed to said second planar surface, a sealed hollow space disposed between said first and second dielectric members and, wherein an incident optical beam enters through said first dielectric member and exits as an emergent optical beam through said second dielectric member, and wherein said emergent beam remains undeviated when said hollow member not immersed in a liquid medium and said emergent beam suffers deviation when immersed in said liquid medium.