Spectrograph with multiplexing of different wavelength regions o

Details Spectrograph with multiplexing of different wavelength regions o Spectrograph with multiplexing of different wavelength regions o

1993-04-21

1995-08-15

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01J 328

Patent

active

054424399

ABSTRACT:
An optical spectrograph utilizes a plurality of holographic transmission optical gratings operative to receive an incoming source of light to be analyzed and diffract the light such that different spectral components impinge upon spatially separated regions of an opto-electronic detector. Various grating configurations are disclosed, including a physical stack of gratings conducive to extreme compactness, as well as a spaced-apart configuration used to preclude spectral cross talk in certain configurations. Diverging light emerging from a fiber-optic bundle is collimated by a first lens assembly prior to passing through the gratings, and a second lens assembly is used to focus the diffracted light onto the detectors, preferably in the form of a two-dimensional CCD array.

REFERENCES:
patent: 3578845 (1971-05-01), Brooks et al.
patent: 4729658 (1988-03-01), Poultney
patent: 5011284 (1991-04-01), Tedesco et al.
patent: 5042893 (1991-08-01), Ong
Lerner et al, "Direct Reading Spectrometer Optimization Using Two Complementary Concave Holographic Gratings", SPIE, vol. 503 1984 pp. 53-58.
Sweedler et al, "High . . . Detectors," Analytical Chemistry, vol. 60, No. 4, Feb. 15, 1988 pp. 282-292.
Kaiser Optical Systems, Inc. Brochure "HoloSpec f/1.8i" VPT System.

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