Translator Disclaimer
1 August 2002 Mapping the Light Field of the Waldmann PDT 1200 Lamp: Potential for Wide-field Low Light Irradiance Aminolevulinic Acid Photodynamic Therapy
Author Affiliations +
Abstract

A quantitative assessment of the light field produced by a Waldmann PDT 1200 lamp is presented. A photodiode detector array capable of measuring a beam diameter of 30 cm was used to map the light field. The irradiance was measured as a function of voltage. For lamp–detector distances of 10 cm (central axis irradiance = 250 mW/cm2), the spatial profile of irradiance was typically Gaussian. For lamp–detector distances of 30 cm (central axis irradiance = 79 mW/cm2), the spatial profile appeared more hemispherical in shape but with some asymmetry. The relative percentage variation between the maximum and minimum irradiance with respect to the central axis irradiance was approximately 13% and 3%, respectively, for a beam width of 12 cm. Beyond a lamp–detector distance of 50 cm (central axis irradiance = 32 mW/cm2), the spatial profile of irradiance was observed to become more crater-like in structure, with a minimum on the central axis and an approximately symmetric peak at a radial distance of 9 cm from the center. The relative percentage variation of this peak irradiance with respect to the central axis irradiance was approximately 17%. At lamp–detector distances of 70 and 90 cm (central axis irradiance = 19 and 13 mW/cm2, respectively), the beam's profile was asymmetric, and the irradiance was observed to increase from the center to a radial distance of 15 cm (beam width 30 cm). For a lamp–detector distance of 70 and 90 cm, the relative percentage variation between the maximum irradiance and the central axis irradiance was approximately 25% and 35%, respectively.

Jeffrey Crosbie, Kenneth Winser, and Paul Collins "Mapping the Light Field of the Waldmann PDT 1200 Lamp: Potential for Wide-field Low Light Irradiance Aminolevulinic Acid Photodynamic Therapy," Photochemistry and Photobiology 76(2), 204-207, (1 August 2002). https://doi.org/10.1562/0031-8655(2002)076<0204:MTLFOT>2.0.CO;2
Received: 18 December 2001; Accepted: 1 May 2002; Published: 1 August 2002
JOURNAL ARTICLE
4 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top