Enhanced collection efficiency fiber-optic probe

Details Enhanced collection efficiency fiber-optic probe Enhanced collection efficiency fiber-optic probe

1998-02-06

1999-10-26

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 42, 385 37, 385115, 385119, G02B 632

Patent

active

059742119

ABSTRACT:
A fiber-optic probe uses imaging optics between the remote ends of the excitation and collection fibers and the sample under investigation to enhance working distance and efficiency. In one embodiment a plurality of collection fibers are disposed circumferentially around a central excitation fiber, enabling a conventional focussing lens arrangement to be used for imaging purposes. The assembly may optionally include a rotationally symmetric diffraction grating to cause the excitation energy to assume an annulus superimposed over the image of the collection fibers. The excitation and collection fiber may alternatively be physically spaced apart from one another sufficient to permit one or more optical elements to be disposed in either or both of the excitation and collection paths, depending upon the application.

REFERENCES:
patent: 4573761 (1986-03-01), McLachlan et al.
patent: 5402508 (1995-03-01), O'Rourke et al.
B. Marquardt, S. Goode, S. Angel, In Situ Determination of Lead in Paint Laser-Induced Breakdown Spectroscopy Using a Fiber-Optic Probe, Anal. Chem. 1996, 68, pp. 977-981.

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