HANDHELD FLUOROMETER

摘要

A fluorometer for measuring fluorescence of a sample includes an excitation source for emitting electromagnetic radiation along a first beam path to induce fluorescence in the sample. An excitation filter transmits electromagnetic radiation from the excitation source toward the sample. An excitation filter holder supports the excitation filter and defines an aperture for passage of electromagnetic radiation from the excitation source. The aperture is positioned asymmetrically relative to the first beam path such that the aperture allows an asymmetrical portion of the electromagnetic radiation in the first beam path to pass toward the sample and the excitation filter holder blocks passage of a corresponding asymmetrical portion of the electromagnetic radiation in the first beam path. The blocked passage of the corresponding asymmetrical portion of the electromagnetic radiation in the first beam path reduces the amount of electromagnetic radiation oriented directly from the emitter module to the detector module.

主权项

1. A fluorometer for measuring fluorescence of a sample comprising dipicolinic acid, the fluorometer comprising:
a housing; a controller supported by the housing, the controller configured for determining a concentration of a substance in the sample based on a detected fluorescent emission; and a sensor head comprising:
an emitter module operatively coupled to the controller and including:
an excitation source configured for emitting electromagnetic radiation at one or more wavelengths to induce fluorescence in the sample, the emission of the electromagnetic radiation being directed along a first beam path,an excitation filter configured for transmitting electromagnetic radiation within a first wavelength range toward the sample, andan excitation filter holder supported by the housing and defining an aperture for passage of electromagnetic radiation, the excitation filter holder adapted to support the excitation filter such that the excitation filter filters electromagnetic radiation emitted by the excitation source to within the first wavelength range and permits passage of such filtered electromagnetic radiation through the aperture and towards the sample such that the first beam path defines a trajectory of electromagnetic radiation from the excitation source to the excitation filter, via the aperture and toward the sample, anda detector module operatively coupled to the controller, the detector module configured for detecting fluorescence emitted by the sample, wherein the fluorometer displays the concentration of the substance in the sample determined by the controller,the aperture being positioned asymmetrically relative to the first beam path such that the aperture passes an asymmetrical portion of the electromagnetic radiation in the first beam path and the excitation filter holder blocks passage of a corresponding asymmetrical portion of the electromagnetic radiation in the first beam path, the blocked passage of the corresponding asymmetrical portion of the electromagnetic radiation in the first beam path reducing the amount of electromagnetic radiation oriented directly from the emitter module to the detector module.