Radiant Flux of Near Field in Temperature Measurements
- Instituto Tecnologico de Queretaro, Av. Tecnologico SN, esq. Escobedo, Centro, Queretaro, Qro. 76000. MEXICO (Mexico)
- Centro de Ingenieria y Desarrollo Industrial, Av. Playa Pie de la Cuesta 702, Desarrollo San Pablo, Queretaro, Qro. 76130 (Mexico)
In this work we present a calculation of the radiant flux exiting from an object which is at a constant temperature. The flux calculation is based in the propagation model of irradiance and it permit to predict the small variations in measurements of infrared radiation sources when the pyrometer is going far from the source, this variation is known as distance effect. The classical radiometry defines the quantity radiance, which is used in temperature measurements of objects through the infrared radiation they emit. Unfortunately the radiance does not permit to take into account the variations of the radiant flux measured by the pyrometer due to the wave propagation of the radiation given that the radiance definition is based in ray propagation, the geometrical model. Due to the anterior in this work we present a radiant flux calculation using wave model and considering the approximation of the near field or Fresnel approximation. We show experimental results that confirm our proposal.
- OSTI ID:
- 21137086
- Journal Information:
- AIP Conference Proceedings, Vol. 992, Issue 1; Conference: RIAO/OPTILAS 2007: RIAO: 6. Ibero-American conference on optics; OPTILAS: 9. Latin-American meeting on optics, lasers and applications, Campinas, Sao Paulo (Brazil), 21-26 Oct 2007; Other Information: DOI: 10.1063/1.2927013; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sensitivity of blackbody effective emissivity to wavelength and temperature: By genetic algorithm
Spectral emissivity of tungsten: analytic expressions for the 340-nm to 2. 6-. mu. m spectral region