Patent ID: 9116029
Filing Date: 2015-08-25
Classification: B64D,G01F

Abstract:
1. An optical level sensor for detection of a current liquid level inside a tank, the sensor being mounted to the tank, the sensor comprising: a light source, a light detector with a processing unit, and optical fibers, the optical fibers comprising each at least one input side, assigned to the light source and reaching from the light source into the tank, and at least one output side, assigned to the processing unit via the light detector and reaching from inside the container or tank to the light detector, wherein the optical level sensor also includes: mounting means for mounting the sensor to a ceiling of the tank; and a sensor tube attached to the tank and having a housing sealed by sealing means to the tank above the liquid level and a bottom surface below the liquid level; the sensor tube being provided with support and guidance elements extending with at least three radially distributed positions inside the tank and which collect support and guide optical fibers to different heights of the tank, with each optical fiber having a number of input sides and a number of turns forming sensor heads between two input sides, for a different level; each optical fiber being guided in its half-length through a corresponding support and guidance element, with the corresponding support and guidance element bending the fiber in turns forming the sensor heads of a small radius r around at least one corresponding guideway of the corresponding support and guidance element.