TAILIEUCHUNG - Evaluation of average directional effective emissivities of isothermal cylindrical-inner-cone cavities using monte carlo method

The algorithm developed by us has an advantage in simplicity and time saving of calculations. It can be used in blackbody cavity design considerations, especially in the cylindrical-inner-cone cases. | Communications in Physics, Vol. 27, No. 4 (2017), pp. 357-367 DOI: EVALUATION OF AVERAGE DIRECTIONAL EFFECTIVE EMISSIVITIES OF ISOTHERMAL CYLINDRICAL-INNER-CONE CAVITIES USING MONTE CARLO METHOD MINH NGUYEN QUANG † AND BINH NGUYEN VAN Center for System Engineering and Integration - CSEi, National Center for Technological Progress-NACENTECH, Vietnam † E-mail: Received 12 September 2017 Accepted for publication 9 October 2017 Published 22 December 2017 Abstract. We have used the Monte Carlo method based on successive reflections and ray tracing to calculate the average normal directional effective emissivities of isothermal cylindrical-innercone cavities for various geometrical parameters. A simplified specular-directional diffuse reflection model was applied in our calculations for cavities working in the infrared spectral range. Our results are in good agreement comparing with what obtained by other authors. The algorithm developed by us has an advantage in simplicity and time saving of calculations. It can be used in blackbody cavity design considerations, especially in the cylindrical-inner-cone cases. Keywords: blackbody, isothermal cavity, effective emissivity, specular-diffuse reflection model, Monte Carlo method, pseudo-random number, ray tracing. Classification numbers: ; ; . c 2017 Vietnam Academy of Science and Technology 358 MINH NGUYEN QUANG AND BINH NGUYEN VAN I. INTRODUCTION The blackbody cavities as artificial sources of radiation are often used for the calibration of radiation thermometers, thermal imagers and radiometers. In case of on-field operating instruments, limited size and weight of cavities are important requirements of a radiation source [1]. Cavities having cylindrical - inner - cone geometry are usually considered in practice. They provide moderately collimated beam with high and uniform effective emissivities with compact geometrical dimensions [1, .

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