The Stefan–Boltzmann constant obtained from the
                    <i>I–V</i>
                    curve of a bulb

Abellán, Francisco J.; Ibáñez, J. A.; Valerdi, Ramón P; García, Juan Gómez

doi:10.1088/0143-0807/34/5/1221

Cited by 7 publications

(5 citation statements)

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“…An analysis of the I-V curves of a light bulb aimed at measuring the Stefan-Boltzmann constant has previously appeared in [16]; here we present results for small resistance perturbations of the Wien bridge circuit. The resistance of a wire is to a good approximation a linear function of its temperature.…”

Section: Filament Resistancementioning

confidence: 97%

The dynamics of a stabilised Wien bridge oscillator

Lerner

2016

Eur. J. Phys.

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We present for the first time analytic solutions for the nonlinear dynamics of a Wien bridge oscillator stabilised by three common methods: an incandescent lamp, signal diodes, and the field effect transistor. The results can be used to optimise oscillator design, and agree well with measurements. The effect of operational amplifier marginal nonlinearity on oscillator performance at high frequencies is clarified. The oscillator circuits and their analysis can be used to demonstrate nonlinear dynamics in the undergraduate laboratory.

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Section: Filament Resistancementioning

confidence: 97%

The dynamics of a stabilised Wien bridge oscillator

Lerner

2016

Eur. J. Phys.

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“…Infrared thermography is based on the fundamental principle that all objects emit nonvisible light from the infrared spectra [38]. According to Stefan-Boltzmann's law, the power emitted per unit area is directly related to the temperature of the object, depending on the emissivity of the surface, with the Stefan-Boltzmann constant being the proportionality factor that relates the energy flux (heat radiation per unit area and time) to thermodynamic temperature [38,39]. Moreover, Planck's law states that an object's spectral radiance is a direct relation of power output per steradian per unit area (W/sr/m 2 ) [38].…”

Section: Converting Infrared Radiation To Nozzle Surface Temperaturementioning

confidence: 99%

High-Speed Infrared Measurement of Injector Tip Temperature during Diesel Engine Operation

et al. 2021

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Pre-catalyst engine emissions and detrimental injector deposits have been widely associated with the near-nozzle fluid dynamics during and after the injection events. Although the heating and evaporation of fuel films on the nozzle surface directly affects some of these processes, there are no experimental data for the transient evolution of nozzle surface temperature during typical engine conditions. In order to address this gap in knowledge, we present a non-intrusive approach for the full-cycle time resolved measurement of the surface temperature of production nozzles in an optical engine. A mid-wave infrared high-speed camera was calibrated against controlled conditions, both out of engine and in-engine to account for non-ideal in surface emissivity and optical transmissivity. A custom-modified injector with a thermocouple embedded below the nozzle surface was used to validate the approach under running engine conditions. Calibrated infrared thermography was then applied to characterise the nozzle temperature at 1200 frames per second, during motored and fired engine operation, thus revealing for the first time the effect of transient operating conditions on the temperature of the injector nozzle’s surface.

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“…Desde há várias décadas que foi reconhecido que o filamento de tungsténio de uma lâmpada de incandescência poderia ser utilizado como radiador sendo usado em experiências de verificação da lei de StefanBoltzmann [3][4][5][6][7][8]. Uma das principais vantagens da sua utilizaçãoé a possibilidade de controlo e medida da temperatura do filamento a partir das medidas…”

Section: O Fio De Tungsténio Como Radiadorunclassified

“…em que αé o coeficiente térmico de resistência, e ρ a resistividadeà temperatura T. Para o tungsténiò a temperatura ambiente α = 0, 0053 K −1 [4,8]. Para variações da ordem das dezenas ou centenas de kelvin, esta lei nãoé válida sendo necessário recorrer a tabelas de valores medidos ou a expressões empíricas ajustadas a esses dados [9].…”

Section: O Fio De Tungsténio Como Radiadorunclassified