Evaluation of the Keitz Method for Quantifying the UV Output of Medium Pressure Mercury Lamps

Daynouri, Farnaz; Robinson, Jim

doi:10.1080/01919512.2012.694327

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The pulsed xenon lamp can be regarded as a linear light source, so the radiant flux (radiant power) P r1 can be calculated using the Keitz formula [ 29 ], as shown in Equation (3), in which E 1 is the measured irradiance, L is the length of the lamp, D is the distance between the lamp axis and the probe of the energy meter, and the half apex angle α can be derived in Equation (4). Subsequently, the radiant efficiency η can be obtained using Equation (5).…”

Section: Methodsmentioning

confidence: 99%

Effects of Electrical Pulse Width and Output Irradiance on Intense Pulse Light Inactivation

et al. 2022

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The effects of electrical pulse width and output irradiance on the inactivation effect of intense pulse light (IPL) are studied in this paper. The measured radiant efficiency of pulsed xenon lamp can be more than 50%, and its irradiance can reach levels 100-times greater than that of a low-pressure mercury lamp. Staphylococcus aureus is used in inactivation experiments. When the irradiance and dose are both constant, there is no significant difference in inactivation efficiency when the pulse width is changed. However, a narrow pulse width corresponding to high irradiance at the same single-pulsed dose displays better inactivation effect. Experimental results are compared between the xenon lamp and low-pressure mercury lamp. The reduction factor (RF) value of the xenon lamp is more than 1.0 higher under the condition of both the same dose and irradiance. In order to achieve the same RF value, the dose of continuous-wave light must be at least three-times greater than that of pulsed light. The spectral action of the pulsed light is also studied. It is confirmed that UVC plays a major role across the whole spectrum. The experimental results show that extreme high-pulsed irradiance presents the main contributing factor behind the excellent bactericidal effect of IPL.

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Section: Methodsmentioning

confidence: 99%

Effects of Electrical Pulse Width and Output Irradiance on Intense Pulse Light Inactivation

et al. 2022

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Two-dimensional Keitz method for the radiant power measurement of planar ultraviolet excilamps

Zhu,

Li,

Han

et al. 2024

Appl. Opt.

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Planar XeBr∗ and XeCl∗ excilamps emitting noncoherent narrowband UVB light (280–315 nm) are now widely used to cure psoriasis and vitiligo as well as to improve vitamin D synthesis. The two-dimensional integral formula has been deducted in this study, which is a good method and has great practical significance to calculate the total radiant power and assess the energy efficiency of a planar UV lamp. The measured radiant power of planar white LED lamps through a two-dimensional Keitz formula has been compared to that of gonio-photometer, verifying the applicability of the formula. The optimum measurement distance is dependent on the lamp length (1.5L≤D≤3.5L) for which the derivation from the two methods can be controlled within 10%. The planar XeBr∗ excilamps have been measured and compared to coaxial excilamps, which show similar patterns of change for the radiant characteristics. Since the planar radiant power formula only needs to measure normal illuminance at a certain distance from the symmetric center of the lamp, it is more convenient to use and is a low-cost method to promote the development of large-sized planar ultraviolet lamps.

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Evaluation of the Keitz Method for Quantifying the UV Output of Medium Pressure Mercury Lamps

Cited by 2 publications

References 4 publications

Effects of Electrical Pulse Width and Output Irradiance on Intense Pulse Light Inactivation

Effects of Electrical Pulse Width and Output Irradiance on Intense Pulse Light Inactivation

Two-dimensional Keitz method for the radiant power measurement of planar ultraviolet excilamps

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