Estimation of rib waveguide radiation losses

An improved analytical model for the description of the anode contraction zone of a high intensity arc takes radiation effects into account. The conservation equations for the anode contraction zone and the adjacent undisturbed arc column are solved numerically with a relaxation method. Results for atmospheric pressure argon arcs at three different currents demonstrate that radiation losses reduce temperature peaks substantially and, at the same time, provide a smooth matching of arc column and contraction zone solutions. Although the model seems to be adequate for a large portion of the anode contraction zone, the results indicate that refinements of the model are necessary for the region close to the anode, in particular, deviations from LTE have to be taken into account.

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Far-detuned mid-IR wavelength conversion at 4.05 µm in a tellurium oxide rib waveguide pumped at 1550 nm: Design and analysis

AIP Advances ◽

10.1063/5.0049865 ◽

2021 ◽

Vol 11 (5) ◽

pp. 055110

Author(s):

Than Singh Saini ◽

Shilpi Arora ◽

V. R. Supradeepa

Keyword(s):

Wavelength Conversion ◽

Tellurium Oxide ◽

Rib Waveguide

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Complete Characterization of Thermoelectric Materials by a Combined van der Pauw Approach and the Effect of Radiation Losses

MRS Proceedings ◽

10.1557/opl.2011.514 ◽

2011 ◽

Vol 1314 ◽

Cited By ~ 2

Author(s):

Johannes de Boor ◽

Volker Schmidt

Keyword(s):

Thermal Conductivity ◽

Measurement Errors ◽

Conductivity Measurement ◽

Short Review ◽

Complete Characterization ◽

Radiative Heat Loss ◽

Radiation Losses ◽

Novel Method ◽

Simple Estimation ◽

Van Der Pauw

AbstractWe have recently presented a novel method for a complete thermoelectric characterization [J. de Boor, V. Schmidt. Adv. Mater. 22:4303, (2010)]. This method is based on the well-known electrical van der Pauw method and allows measurement of the electrical and thermal conductivity, the Seebeck coefficient and the thermoelectric figure of merit. After a short review of this method we will discuss the systematic measurement errors of the method. It turns out that radiative heat loss can affect the thermal conductivity measurement significantly. We will give a simple estimation for the relative error due to radiation losses and discuss error minimizing strategies.

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