15 Result(s)
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Article
Z. Yuan
Industrial Chemistry/Chemical Engineering
Physical Chemistry
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Article
Calibration of Pyrometers by Using Extrapolation and Interpolation Methods at NIM
High-temperature fixed points (HTFPs) have been thoroughly investigated, and the performance of variable temperature blackbodies (VTBB) has also improved rapidly. These two are beginning to be used in the cali...
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\(-30\,^{\circ }\hbox {C}\) to \(960\,^{\circ }\hbox {C}\) Variable Temperature Blackbody (VTBB) Radiance Temperature Calibration Facility
A blackbody radiance temperature calibration facility (RTCF) has recently been established at the National Institute of Metrology, China, offering calibration and verification services for variable temperature...
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Generalized Effective Radiance Temperature
Radiance temperature is one of the most important and widely used concepts in radiation thermometry. The usual definition of radiance temperature does not strictly apply for complex situations, such as when su...
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A \({-}30\,^{\circ }\hbox {C}\) to \(80\,^{\circ }\hbox {C}\) Stirred-Liquid-Bath-Based Blackbody Source
At the national facility for blackbody source radiance temperature calibration of the National Institute of Metrology, China, a stirred liquid bath blackbody was developed for use as a radiance temperature ref...
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Study on Reducing the Size-of-Source Effect of Pyrometers
The size-of-source effect (SSE) is an important uncertainty source in radiation thermometry when radiation targets with different sizes are measured. In this article, a test pyrometer was established to study ...
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Spectral Radiation Drift of LEDs Under Step-Mode Operation and Its Effect on the Measurement of the Non-Linearity of Radiation Thermometers
The non-linearity (NL) of radiation thermometers is critically involved when realizing ITS-90 above the silver point. It has to be corrected for, and its uncertainty should be adequately specified. In this art...
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Size-of-Source Effect Difference Between Direct and Indirect Methods of Radiation Thermometers
The size-of-source effect (SSE) of radiation thermometers is generally determined using direct and indirect methods. The present paper describes the difference in the SSE obtained using the two methods. Three ...
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Realization of ITS-90 Above the Silver Point at the NIM
The high-temperature primary standard system was gradually improved at the National Institute of Metrology (NIM) in China after 2004. A new primary standard pyrometer (PSP) was developed, one with a size-of-so...
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T 90 Measurement of Co-C, Pt-C, and Re-C High-Temperature Fixed Points at the NIM
The blackbodies of high-temperature fixed points (HTFPs), namely, Co-C, Pt-C, and Re-C eutectic points, were gradually established at the National Institute of Metrology (NIM) of China after 2007, and their ch...
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Results of Long-Term Stability Tests Performed for the Eutectics Co–C and Pt–C
The stability of the Co–C and Pt–C eutectic fixed points is investigated in this article. Six cells were employed for the testing. Two existing cells, a Co–C cell with a C/C sheet incorporated and a Pt–C cell ...
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Calibration of the Irradiance Responsivity of a Filter Radiometer for T Measurement at NIM
At the National Institute of Metrology of China (NIM), silicon photodiode-based narrow-band interference filter radiometers (FRs) have been designed for the radiometric determination of the thermodynamic tempe...
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A Comparison of the ITS-90 Among NPL, NIM, and CEM, Above the Silver Point Using High-Temperature Fixed Points
A prototype comparison of the ITS-90, as realized by NPL, NIM, and CEM, using high-temperature fixed points (HTFPs) of Co-C (1324 °C), Pt-C (1738 °C), and Re-C (2474 °C), is reported. The local realizations of...
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Influence of Non-ideal Blackbody Radiator Emissivity and a Method for its Correction
Demands for accurate temperature measurement and calibration are increasing along with the wider use of radiation thermometry in industry. However, the deviation of a ‘blackbody’ radiator emissivity from the e...
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Linearity Study of a Spectral Emissivity Measurement Facility
Linearity is one of the important characteristics of a spectral radiation measurement facility. Basically, it depends on the linearity of the spectral responsivity of the detector and amplifier at different wa...
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Uncertainty Budgets for Calibration of Radiation Thermometers below the Silver Point
Below the freezing point of silver, radiation thermometers are generally calibrated by implementing the multi-point interpolation method using blackbody measurements at three or more calibration points, rather...
