Abstract:
A laser-induced fluorescence analysis device (1), comprising a tube (2) including a channel, elements projecting an excitation light (13), optical collecting member (7), optical measurement elements (8) and a processing member (9) for producing an analysis result, the collecting member being mechanically coupled to one end of the channel, the tube being integrally made of a material with refractive index either lower than that of water, or higher than both that of water and that of ambient air so as to guide the fluorescence light along the channel in the channel and/or its wall up to the collecting member, which is designed to collect the fluorescence light propagated along the longitudinal direction of the channel.
Abstract:
A multi-channel, reconfigurable fiber-coupled Raman instrument uses fiber optic switches for laser and calibration light routing to facilitate automated calibration, diagnosis and operational safety. The system allows wavelength axis calibration on all channels; laser wavelength calibration (including multiple and/or backup laser options); fiber coupling optimization; fault detection/diagnosis; and CCD camera binning setup. In the preferred embodiment, dedicated calibration channels surround data channels on a 2-dimensional CCD dispersed slit image implemented using a unique cabling architecture. This “over/under” calibration interpolation approach facilitates quasi-simultaneous or sequential calibration/data acquisitions. CCD binning between sequential calibration and data acquisitions enables higher density multi-channel operation with tilted images based upon a multiplexed grating configuration. A diamond sample is used as a Raman shift reference for laser calibration, preferably in the form of a small disc sampled with an edge-illuminating probe using two unfiltered fibers.