空中の水滴および氷晶の機内検出のための装置および方法

• Format: Patent
• Language: Japanese
• Published: 30.04.2015
• Subjects: AIRCRAFT; ALARM SYSTEMS; ANALOGOUS ARRANGEMENTS USING OTHER WAVES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSIONTRANSMISSIONS IN AIRCRAFT; AVIATION; COSMONAUTICS; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLYING SUITS; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; METEOROLOGY; ORDER TELEGRAPHS; PARACHUTES; PERFORMING OPERATIONS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SIGNALLING; SIGNALLING OR CALLING SYSTEMS; TESTING; TRANSPORTING

A device for optically detecting and distinguishing airborne liquid water droplets and ice crystals includes an illumination portion and a detection portion. The illumination portion (312) outputs a circularly polarized illuminating beam (318). The detection portion receives circularly polarized backscattered light from moisture in the cloud, in response to the illuminating beam. The circularly polarized backscattered light (322) is passed through a circular polarizer (333) to convert it into linearly polarized backscattered light, which is split into two components. Each of the two components is optionally subject to further linear polarization to filter out any leakage-type orthogonal polarization. The two components are then optically detected and the resulting detection signals are used to calculate one or more parameters reflective of the presence or absence of airborne ice crystals and/or water droplets.