Coded aperture imaging spectrometer

Details Coded aperture imaging spectrometer Coded aperture imaging spectrometer

1995-06-06

1997-05-06

Hantis, K.

Optics: measuring and testing

By dispersed light spectroscopy

With aperture mask

G01J 304

Patent

active

056276397

ABSTRACT:
An imaging spectrometer that includes a mask (214) that has an array of n rows (302) and n columns (304) of transmissive elements (306) for transmitting the light from a plurality of locations of an image and of opaque elements (308) for blocking light from a plurality of locations of the image. The transmissive and opaque elements are arranged in a Hadamard pattern having rows (and columns) that are different cyclic iterations of an m-sequence. A grating (110) disperses the transmitted light from the transmissive elements (306) in a linear spatial relationship in a predetermined relationship to the wavelength of the transmitted light. A detector array (406) has a plurality of detector elements (408) arranged in a row to receive the dispersed transmitted light from the grating (110). Each detector element (408) provides an intensity signal indicative of the intensity of the light impinging thereon. A computer (410) generates a spectrum matrix having elements indicative of the frequency spectrum of the plurality of locations of the image. The spectrum matrix is produced by matrix multiplication of an inverse mask pattern matrix and a data matrix. Each element of the mask pattern matrix is either a 0 for opaque elements (308) or a 1 for transmissive elements (306). The inverse mask pattern matrix is generated by replacing each 0 of the pattern by -1, taking the transpose, and multiplying by 2/(n+1). Each row of the data matrix represents data taken from the same location of the image and through a corresponding row of the mask (214).

REFERENCES:
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patent: 4435838 (1984-03-01), Gourlay
patent: 5050989 (1991-09-01), Tassel et al.
Mende et al., "Ultraviolet Imaging Spectrometer for Monitoring High-Latitude Precipitating Patterns", Optical Engineering, Dec. 1993, vol. 32, No. 12, pp. 3139-3146.
Mende et al., "Hadamard Spectroscopy With a Two-Dimensional Detecting Array", Applied Optics, 1 Dec. 1993, vol. 32, No. 34, pp. 7095-7105.
Sloane et al; "Codes for Multiplex Spectrometry" Applied Optics, vol. 8, No. 10, Oct. 1969, pp. 2103-2106.

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