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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0978709 (1993-02-05) |
우선권정보 | IT-0001729 (1991-06-24) |
국제출원번호 | PCT/EP92/01244 (1992-06-04) |
§371/§102 date | 19930205 (19930205) |
국제공개번호 | WO-9300577 (1993-01-07) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 276 인용 특허 : 0 |
A system for measuring the “time of flight”or transfer time of a sound wave in a gas by using the relation between the gas temperature and the velocity of the sound wave in the gas, and calculating therefrom the temperature of the gas. The system comprises an emitter, which generates a sound which i
A system for measuring the “time of flight”or transfer time of a sound wave in a gas by using the relation between the gas temperature and the velocity of the sound wave in the gas, and calculating therefrom the temperature of the gas. The system comprises an emitter, which generates a sound which is coherent in phase, at one frequency or a group of frequencies; a self-correlating decoder and a receiver, which is associated with the emitter, and which sends the sound to a filter system and to an assembly controlled by a microprocessor, which processes the signal coming out of the filter system in a shape similar to a Hamming wave shape in order to determine the absolute maximum value and therefrom determine the transfer time. With this knowledge, it is easy to relate the transfer time to the distance traveled between the emitter and receiver and the known properties of the gas, in order to arrive at the temperature of the gas through which the sound has been sent.
A system for measuring the transfer time of a sound wave in a gas, the velocity of said sound wave in the gas and thus the temperature of the gas using the relation between the temperature of the gas and the velocity at which said sound wave propagates through the gas, and, to this purpose, consisti
A system for measuring the transfer time of a sound wave in a gas, the velocity of said sound wave in the gas and thus the temperature of the gas using the relation between the temperature of the gas and the velocity at which said sound wave propagates through the gas, and, to this purpose, consisting of a current controlled emitter (T2) stimulated by a first electric signal to generate sound at a specific point in the gas, a receiver (T1) to receive said sound after the sound has traveled a given distance through the gas, a transducer for converting said sound into a second electric signal, a means of comparing said first and second electrical signals by means of a suitable algorithm and thus defining the transfer time of said sound, an indicator of the temperature of said gas being a function of the transfer time, wherein: the current controlled emitter (T2), generates a sound of coherent phase and substantially of a single or a group of frequencies; the receiver (T1) is followed by a self-correlating decoder, both associated to said emitter in order to send the sound received to a band-pass filter system with narrow band and extremely high stability FI; said system further comprising an electronic circuit breaker (K), that acts on the signal entering the filter system FI and which is driven by a microprocessor (MP) by means of an iterating algorithm so as to allow always a pre-set number of n first waves of the signal entering the filter system (FI); and wherein the signal out-going from the filter system FI forms a Hamming wave shape within a Time-Amplitude diagram, which is processed by said microprocessor (MP) in order to find the absolute maximum of the oscillations making up said Hamming wave shape, so as to determine therefrom the transfer time and, by reference to known characteristics of the gas, calculate the temperature of the gas.
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