What question did this study set out to answer?

To design and characterize a compact photometer for measuring transmittance, fluorescence, and scattering simultaneously.

Compact, Multipurpose, Diode-Laser-Based Photometer

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This instrument demonstrates accurate signal collection in undergraduate research projects, suggesting effective teaching tools.

To design and characterize a compact photometer for measuring transmittance, fluorescence, and scattering simultaneously.
Designed and constructed a compact photometer using a diode laser as the excitation source.
Employed PIN photodiodes as detectors; utilized various lenses and filters for optical arrangements.
Developed simple DC electronics to collect multiple signals at once.
Characterized the instrument with dyes and scattering agents.
Achieved fluorescence limits of detection (LOD) for methylene blue and Nile blue A at 2 ppb.
Compared to standard spectrophotometers, the LOD for methylene blue by absorption is five times higher.
Successfully applied the instrument in undergraduate research projects.

Leach et al. (2003) studied this question.

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