The light source in spectrophotometer must contain all spectral lines of visible light and have strong enough power in
entire visible light spectrum range, so it calls for composition of several light sources. In order to reduce light source
error and improve test accuracy, the light source was divided into reference light and test light. The reference light goes into inference path directly to get electrical signals; the test light falls on testing sample after perfect diffuse reflected by integrating sphere, then carries information of testing sample ,and passes through emitting hole, falls on photovoltaic cell to get corresponding electrical signals. Several projects of realizing perfect diffuse reflection of test light from both light source design and structure design are put forward in the essay, and simulated by Tracepro and other optical software. Then analyze and evaluate these several projects to get optimization design.
A fiber-optic evanescent wave (EW) fluorescence sensor is often selected for its excellent performance, to detect the
surface-specific event that takes place within a wavelength thickness of the immediate surface layer of the fiber core
outside. In this paper, we describe a specific fiber-optic EW fluorescence sensor with a naturally built-in high signal to
noise ratio, including a novel sensing architecture. It includes two identical, low hydroxyl content, large core, multimode
plastic-clad silica fibers that are set perpendicular to one another, with a fiber for delivering incident exciting light and
the other for receiving fluorescent light. An assay on the fiber-optic fluorescence sensor capable of simultaneously
enhancing fluorescent signal and eliminating stray excitation light was examined. Such a capability can be achieved by
reshaping a fluorescent sample fluid droplet and regulating the distance between the light exit of incident fiber and the
bare core segment of receiving fiber. The prime significance of this work lies in its revelation of the outstanding
influence of end-face total internal reflection (end-face-TIR) on enhancing signal intensity of fiber-optic EW
fluorescence sensor, which reroutes the trajectories of the end-face-TIR capable rays and causes some of them to be
detectable at the receiving end.
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