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Related Experiment Video

Updated: Feb 20, 2026

Single Plane Illumination Module and Micro-capillary Approach for a Wide-field Microscope
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Programmable LED-based integrating sphere light source for wide-field fluorescence microscopy.

Aziz Ul Rehman1, Ayad G Anwer2, Ewa M Goldys2

  • 1ARC Centre of Excellence in Nanoscale Biophotonics, Macquarie University, Sydney, 2109, New South Wales, Australia; Department of Physics and Astronomy Macquarie University, Sydney, 2109, New South Wales, Australia; Biophotonics Laboratory, National Institute of Lasers and Optronics, Lehtrar Road, Islamabad 45650, Pakistan.

Photodiagnosis and Photodynamic Therapy
|October 19, 2017
PubMed
Summary

Researchers developed a programmable integrating sphere light (PISL) source for fluorescence microscopy. This LED-based system offers tuneable wavelengths for enhanced spectral imaging of live cells.

Keywords:
BV2CellsFluorescence microscopyIntegrating sphereLow noise CMOS cameraSpectral spatial profile

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Area of Science:

  • Biophotonics
  • Microscopy
  • Cell Biology

Background:

  • Traditional mercury lamps in fluorescence microscopy have limited spectral tuning capabilities.
  • Advanced spectral imaging requires light sources with precise wavelength control and uniform illumination.

Purpose of the Study:

  • To design and construct a novel programmable integrating sphere light (PISL) source for fluorescence microscopy.
  • To overcome the spectral limitations of mercury lamps and enable advanced spectral imaging applications.

Main Methods:

  • Developed a PISL source utilizing nine LEDs, light-collecting optics, an integrating sphere, and a baffle.
  • Integrated the PISL source with a Leica DM IRB inverted microscope and a high-sensitivity CMOS camera.
  • Demonstrated the system's capability through multispectral autofluorescence imaging of live BV2 cells.

Main Results:

  • The PISL source provides tuneable illumination in the 365-490nm range.
  • The light source exhibits a uniform spatial profile and sufficient power at the objective.
  • Successful multispectral autofluorescence imaging of live BV2 cells was achieved.

Conclusions:

  • The developed PISL source is a viable alternative to mercury lamps for fluorescence microscopy.
  • This system enables advanced spectral imaging, particularly for live-cell autofluorescence studies.
  • The PISL source enhances the spectral capabilities of standard fluorescence microscopes.