[특허]Ice detector and deicing fluid effectiveness monitoring system

Ice detector and deicing fluid effectiveness monitoring system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08B-019/02 B64D-015/20
출원번호	US-0233676 (1994-04-25)
발명자 / 주소	Seegmiller H. Lee B. (Los Gatos CA)
출원인 / 주소	The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (Washington DC 06)
인용정보	피인용 횟수 : 36 인용 특허 : 0

초록 ▼

An ice detector and deicing fluid effectiveness monitoring system for an aircraft is disclosed. The ice detection portion is particularly suited for use in flight to notify the flight crew of an accumulation of ice on an aircraft lifting and control surfaces, or helicopter rotors, whereas the deicing fluid effectiveness monitoring portion is particularly suited for use on the ground to notify the flight crew of the possible loss of the effectiveness of the deicing fluid. The ice detection portion comprises a temperature sensor and a parallel arrangement of electrodes whose coefficient of coupling is indicative of the formation of the ice, as well as the thickness of the formed ice. The fluid effectiveness monitoring portion comprises a temperature sensor and an ionic-conduction cell array that measures the conductivity of the deicing fluid which is indicative of its concentration and, thus, its freezing point. By measuring the temperature and having knowledge of the freezing point of the deicing fluid, the fluid effectiveness monitoring portion predicts when the deicing fluid may lose its effectiveness because its freezing point may correspond to the temperature of the ambient.

대표청구항 ▼

An ice detecting and deicing fluid effectiveness monitoring system comprising: (a) an inductive ice-sensing electrode array flush mounted onto a first surface of interest and comprising a transmitting electrode and at least one receiving electrode spaced apart from each other, said inductive ice-sensing electrode array having a coefficient of coupling between the spaced-apart transmitting and receiving electrodes that is determined by two factors with the first being a predetermined geometry and spacing between the spaced-apart transmitting and receiving electrodes and the second being an inductive coupling response to a water, frost, or ice substance in a general region of the spaced-apart transmitting and receiving electrodes, said inductive coupling response being indicative of a quantity of the substance in said general region; (b) a first means for measuring a first temperature and being flush mounted onto said first surface of interest and providing a signal indicative of said first measured temperature; (c) an ionic-conduction cell array mounted onto a second surface of interest, said ionic-conduction cell array having a common electrode and a selectable electrode for each cell of said ionic-conduction cell array; (d) a second means for measuring a second temperature and being flush mounted onto said second surface of interest and providing a signal indicative of said second measured temperature; (e) a frequency generator for supplying a first excitation signal and having means for being connected to said transmitting electrode; (f) a voltage detector means having means for being connected to said at least one receiving electrode and detecting a proportion of said first supplied excitation signal to said transmitting electrode, said proportion being determined by said coefficient of coupling, said voltage detector means generating an output signal of an inductive coupling response representative of a quantity of said water, frost, or ice substance in said general region of said spaced-apart transmitting and receiving electrodes; (g) means for individually selecting said cells of said ionic-conduction cell array, said selecting means applying a first polarity of a second excitation signal to said common electrode and a second polarity of said second excitation signal to said individually selected cell of said ionic-conduction cell array, said application of said first and second polarities of said second excitation signal causing said individually selected cell to generate a signal indicative of a conductivity of a deicing substance that spans between the individually selected cell and said common electrode; (h) bridge means connected to receive said signal indicative of the conductivity of said deicing substance, said bridge means generating an output signal representative of an ionic conductivity of said deicing substance in contact with said individually selected cell of said ionic-conduction cell array; and (i) processing means having means for receiving said first measured temperature signal of said first means, said second measured temperature signal of said second means, said inductive coupling response indicative of said quantity of the water, frost, or ice substance in said general region, and said output signal indicative of the ionic conductivity of said deicing substance, said processing means examining (1) said first measured temperature signal of sad first means and said inductive coupling response indicative of said quantity of the water, frost, or ice substance in said general region, and determining if ice is formed on said first surface of interest, and (2) said second measured temperature signal of said second means and said output signal representative of said ionic conductivity of the deicing substance determining a freezing point of said deicing substance on said second surface of interest.

이 특허를 인용한 특허 (36)

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