Thermal radiation effect measurement in enclosure calibration
نویسندگان
چکیده
Abstract The effect of thermal radiation could be the biggest issue in enclosure calibration. Reducing it by taking accurate measurements can improve calibration uncertainty or measurement capability (CMC). However, there is still less information related to procedure that taken from references such as DKD-R 5-7: Calibration Climatic Chambers, 5-8: Hygrometers for Direct Measurement Relative Humidity, and KAN Pd-02.04: Pedoman Kalibrasi Enklosur Suhu. Moreover, one those reference documents suggests a value 0.35 °C standard contributed temperatures up about 30 above ambient. This large understood an attempt produce secure since not measured directly. Therefore, this study describes detailed radiation. Two enclosures, which are oven climatic chamber, used samples. represents with natural convection while chamber flowing air at certain relative humidity. two small PRTs class A diameter 3 mm length 15 mm. Those wrapped aluminum foil have low emissivity (ɛ=0.4) them then painted Nextel 811-21 high (ɛ=0.97). resistance outputs 34401A 6½ Digital Multimeter manufactured Keysight. Before being used, were calibrated stirred bath having U=0.06 confidence level 95 % coverage factor k=2. temperature range 60 140 40 %rh 90 20 25 °C. mathematical model proposed results presented graphically where higher effect, ranging ±0.1 ±0.4 Variation humidity inside does change difference 0.05 within
منابع مشابه
Effect of Variable Thermal Expansion Coefficient and Nanofluid Properties on Steady Natural Convection in an Enclosure
Steady state natural convection is numerically investigated in an enclosure using variable thermal conductivity, viscosity and thermal expansion coefficient of Al2O3–water nanofluid. This study has been conducted for a wide range of Rayleigh numbers (103≤ Ra ≤ 106), concentrations of nanoparticles (0% ≤ Φ ≤ 7%), enclosure aspect ratios (0.5 ≤ AR ≤ 2) and temperature differences between the cold...
متن کاملCalibration and Measurement Procedures for a High Magnification Thermal Camera
Infrared thermography is a relatively mature measurement technology, however systematic evaluation of measurement uncertainty for multi-point measurement (an infrared focal plane array) is very limited, or, does not follow uncertainty evaluation guidelines outlined in the Bureau International des Poids et Mesures Guide to the Expression of Uncertainty in Measurement (BIPM-GUM). In order to appr...
متن کاملThermal Diffusivity Measurement of CadmiumSulphide Nanoparticles Prepared byγ-Radiation Technique
In this study we applied thermal lens (TL) technique to study the effect of size on thermal diffusivity of cadmium sulphide (CdS) nanofluid prepared by using γ-radiation method containing particles with different sizes. In TL experimental set up a diode laser of wavelength 514 nm and intensity stabilized He-Ne laser were used as the excitation source and the probe beam respectively, respectivel...
متن کاملMeasurement of the radiation from thermal and nonthermal radio sources
The widespread use of the internet has enabled complex instrumentation to be available remotely and made it possible for students to use facilities to which they might otherwise not have access. Internet access to radio astronomical observatories, including the 37 m radio telescope at the Massachusetts Institute of Technology Haystack Observatory, has opened up new possibilities for undergradua...
متن کاملThe Proficiency Testing for The Calibration of Radiation Measurement Instrument with Photon Radiation
Radiation monitoring and inspecting instruments are important tools for the measurement of radiation dose rate or radioactivity. Now in Taiwan, there are five laboratories (processors) capable of providing calibrations for radiation monitoring and inspecting instruments. All these five laboratories have been accredited by the Chinese National Laboratory Accreditation (CNLA). In the past, there ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of physics
سال: 2023
ISSN: ['0022-3700', '1747-3721', '0368-3508', '1747-3713']
DOI: https://doi.org/10.1088/1742-6596/2498/1/012022