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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0087052 (1987-08-19) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 291 인용 특허 : 6 |
An apparatus and method for measuring high temperatures in a boiler transmits pulses of acoustic waves, from one side wall of the boiler to an opposite side wall thereof. Acoustic noise within the boiler, as well as the transmitted pulses of acoustic waves are received at the opposite side of the bo
An apparatus and method for measuring high temperatures in a boiler transmits pulses of acoustic waves, from one side wall of the boiler to an opposite side wall thereof. Acoustic noise within the boiler, as well as the transmitted pulses of acoustic waves are received at the opposite side of the boiler. The received signal is digitized and compared to a digitized sample of the pulses during a time period which is more than the maximum transit time for the pulses between the side walls. A point of maximum correlation between the sample and the signal is taken as the arrival time for the pulse and is used to calculate the transit time of the pulse across the boiler. This transit time is used in turn to calculate the velocity of the pulses. The temperature can then be calculated as a function of the velocity, the molecular weight of the medium and the specific heat ratio of the medium. Each pulse has a modulated frequency between 500 and 3,000 Hz.
An apparatus for measuring high temperatures of a medium in a space containing acoustic noise and bounded by side walls at a known distance from each other, comprising: an acoustic transmitter having a wave guide connected to a horn in one side wall for transmitting frequency modulated non-periodic
An apparatus for measuring high temperatures of a medium in a space containing acoustic noise and bounded by side walls at a known distance from each other, comprising: an acoustic transmitter having a wave guide connected to a horn in one side wall for transmitting frequency modulated non-periodic pulses of acoustic waves toward the other side wall, the pulses of acoustic waves having a selected waveform defined by a start frequency, a stop frequency, and a duration controlled by the number of cycles required to linearly sweep between the start and stop frequencies, and being transmitted at selected transmission times; an acoustic receiver having a wave guide connected to a horn in the other side wall for receiving the pulses, plus the acoustic noise in the space, to form a received signal; means for storing a sample of the waveform; means for comparing the sample to the received signal in a cross-correlation operation during a time period which is greater than a maximum transit time of the pulses between the side walls, for determining a point of maximum correlation between the sample and the signal which is taken as the arrival time for the pulses, the amount of time between the transmission time and the arrival time being the actual transit time of pulses between the transmitter and the receiver; means for calculating an offset time, based on the surface temperature of said wave guides, to correct said actual transit time for the temperature of the medium within the wave guides and horns; and means for calculating the temperature of the medium as a function of the actual transit time, said offset time, and the known distance between the side walls which yields a velocity of the pulses through the medium, as well as a function of the molecular weight and the specific heat ratio of the medium.
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