Integrated test target assembly and compact collimator

Details Integrated test target assembly and compact collimator Integrated test target assembly and compact collimator

1993-10-01

1995-05-16

Hannaher, Constantine

Radiant energy

Radiant energy generation and sources

Plural radiation sources

2504941, G01D 1800

Patent

active

054163323

ABSTRACT:
An improved wide-spectrum test target assembly, with visual and near IR (infrared) targets integrated with a long wavelength emissivity target. A single relatively thick optical fiber (78) is used to receive target signals emitting from several thinner fibers (72, 74, 76), each carrying a signal of different wavelength. The integrated signal is then relayed to an aperture (108) of an emissivity target through a gradient index lens (88) to further combine with the long wavelength target signal emitted from the emissivity target assembly (100). By selecting appropriate numerical apertures and diameters of the fibers, relatively high power output is achieved. A light collimator (200) is also disclosed for collimating light generated by the test target assembly to simulate targets at infinity. The collimator includes a primary mirror (220) which is an off-axis section of a paraboloidal mirror, a secondary mirror (230) which is an off-axis section of a hyperboloidal mirror, and a support structure/baffle (210) which supports the mirrors in proper relation and also includes an integrated light baffle surface to prevent light from the test target assembly from passing directly to an image plane.

REFERENCES:
patent: 4387301 (1993-06-01), Wirick et al.
patent: 5083034 (1992-01-01), Frank et al.

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