Hadamard phasing in a multisource array

Details Hadamard phasing in a multisource array Hadamard phasing in a multisource array

1994-05-06

1996-01-30

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356328, G01J 328

Patent

active

054884748

ABSTRACT:
An apparatus and method for minimizing the amplitude range in a time domain signal incorporating a plurality of periodic electromagnetic waves. One embodiment of the invention is a spectrophotometer or polychromatic light transmitter including an array of light emitting diodes or lasers configured for activation in successive encodement patterns, a diffraction grating, an optical slit, a detector and electronic controls including a computer. In operation, the periodic waves driving the diodes or lasers and their phases are adjusted in accordance with Hadamard mathematics in order to minimize constructive and destructive interference between the electromagnetic waves generated by the diodes array. The resulting time domain signal received at the detector is Fourier transformed to the desired spectral space. The invention effectively eliminates centerbursts in the resulting interferogram.

REFERENCES:
patent: 5257086 (1993-10-01), Fateley et al.
Trutna, Jr. et al.; Research on External-Cavity-Lasers; Feb. 1993; Hewlett-Packard Journal.
Fallahi et al.; Grating Demultiplexer Integrated with MSM Detector Array in InGaAs/AlGaAs/GaAs For WDM; IEEE Photonics Technology Letters, vol. 5, No. 7, Jul. 1993.
Jungerman et al.; Dual-Output Laser Model for a Tunable Laser Source; Feb. 1993, Hewlett-Packard Journal; pp. 32-34.
Ishak et al.; Photonic Technology for Lightwave Communications Test Applications; Feb. 1993, Hewlett-Packard Journal, pp. 6-10.
Muller et al.; External-Cavity Laser Design and Wavelength Calibration; Feb. 1993; Hewlett-Packard Journal; pp. 20-27.

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