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Proceedings Paper

Absolute fluorescence calibration
Author(s): I. T. Young; Y. Garini; B. Vermolen; G. Liqui Lung; G. Brouwer; S. Hendrichs; M. el Morabit; J. Spoelstra; E. Wilhelm; M. Zaal
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Paper Abstract

While fluorescence microscope systems remains an essential tool in modern biology and medical work, no compact instrumentation has been developed for the rapid calibration of such systems. Almost invariably results are presented in terms of the [AU], "arbitrary units". To remedy this situation we have developed a small, portable instrument - the size of a microscope slide - that uses low-power LEDs at different wavelengths to produce calibrated amounts of light. A computer controls the instrument--through a USB connector--so that the current to the selected LED can be swept through an increasing range of values. The amount of light measured by the microscope's total imaging system (lenses, filters, EO sensor, and digitizer) is then recorded to provide a "current in, digital value out" calibration. Further, the current can be translated easily to optical power and thus photons per second at the chosen LED wavelength. We have built and programmed such a system, tested it for accuracy and precision, and used it to calibrate several microscopes and microscope/lens combinations. The results will be presented.

Paper Details

Date Published: 21 February 2006
PDF: 9 pages
Proc. SPIE 6088, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV, 60880U (21 February 2006); doi: 10.1117/12.638559
Show Author Affiliations
I. T. Young, Delft Univ. of Technology (Netherlands)
Y. Garini, Delft Univ. of Technology (Netherlands)
B. Vermolen, Delft Univ. of Technology (Netherlands)
G. Liqui Lung, Delft Univ. of Technology (Netherlands)
G. Brouwer, Delft Univ. of Technology (Netherlands)
S. Hendrichs, Delft Univ. of Technology (Netherlands)
M. el Morabit, Delft Univ. of Technology (Netherlands)
J. Spoelstra, Delft Univ. of Technology (Netherlands)
E. Wilhelm, Delft Univ. of Technology (Netherlands)
M. Zaal, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 6088:
Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV
Daniel L. Farkas; Dan V. Nicolau; Robert C. Leif, Editor(s)

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