초록 ▼

Method and apparatus for measuring the surface temperature/emissivity of coated steel strip during a coating (e.g., galvannealing) process. The apparatus includes first and second radiation sensors each having a response exponentially related to the reciprocal of absolute temperature when viewing a

Method and apparatus for measuring the surface temperature/emissivity of coated steel strip during a coating (e.g., galvannealing) process. The apparatus includes first and second radiation sensors each having a response exponentially related to the reciprocal of absolute temperature when viewing a blackbody source, and each positioned to receive focused radiation from the surface to be measured to provide first and second signals indicative of the radiation received by the sensor, respectively. To provide the focused radiation, the apparatus includes an optical system for gathering thermal radiation emitted by the surface to be measured and focusing it onto the sensors after a first common filter and second individual filters of differing wavelengths such that the first sensor is responsive to shorter wavelengths, the second sensor is responsive to longer wavelengths, and both sensors view the same area simultaneously. Finally, a processing means is provided for processing the two sensor signals to determine temperature/emissivity. Several variations of the processing means are provided including one which uses a Ratio Correction Factor (RCF) and an apparent emissivity (ECA) for determining temperature/emissivity while another one uses a Black Body Deviation Factor (BBDF).

대표청구항 ▼

An apparatus for measuring the surface temperature and emissivity of coated steel strip during a coating process comprising: a first radiation sensor for receiving radiation from an area on the surface of the coated steel strip and for providing a first signal indicative of the radiation received; a

An apparatus for measuring the surface temperature and emissivity of coated steel strip during a coating process comprising: a first radiation sensor for receiving radiation from an area on the surface of the coated steel strip and for providing a first signal indicative of the radiation received; a second radiation sensor, separate from said first radiation sensor, for receiving radiation from the same area on the surface of the coated steel strip and for providing a second signal indicative of the radiation received, said radiation received by said second radiation sensor is from the exact same area on the surface of the coated steel strip and simultaneous with the radiation received by said first radiation sensor; means for passing differing wavelengths of the received radiation to the first and second sensors such that the first sensor is responsive to shorter wavelengths than the second sensor; and processing means for processing the two signals indicative of radiation to determine at least one of temperature and emissivity.