Apparatus for the optical measurement of spectra distribution

Details Apparatus for the optical measurement of spectra distribution Apparatus for the optical measurement of spectra distribution

1988-05-16

1990-05-29

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, G01B 902

Patent

active

049290800

ABSTRACT:
An optical double-balanced quadrature mixer for analysis of optical spectra, particularly asymmetric optical spectra. Beam splitting means are used in conjunction with a quarter wavelength retardation plate to enable highly stable, accurate and precise spectral analysis. The invention is illustrated in the context of a generic light scattering test setup.

REFERENCES:
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patent: 4671657 (1987-06-01), Calvani et al.
patent: 4798468 (1989-01-01), Ohuchi
Glance, Bernard S., "An Optical Heterodyne Mixer Providing Image-Frequency Rejection," Journal of Lightwave Technology, Nov. 1986.
Walker, N. G., et al. "Simultaneous Phase and Amplitude Measurements on Optical Signals Using a Multiport Junction," Electronics Letters, Oct. 4, 1984.
Travis, A. R. L., Carroll, J. E., "Possible Fused Fibre In-Phase/Quadrature Measuring Multiport," Electronics Letters, Oct. 10, 1985.
Asada, O, et al. "Homodyne Method for Detecting Asymmetric Spectra", Rev. Sci. Instrum. 51(10) Oct. 1980.
Machida, Susumu, et al. "Quantum-Limited Operation of Balanced Mixer Homodyne and Heterodyne Receivers," IEEE Journal of Quantum Electronics, May 1986.
Goldman, Stan, "Understanding the Limits of Quadrature Detection," Microwaves & RF, Dec. 1986.
Jackson, D. A. et al., "Fibre Gyroscope with Passive Quadrature Detection", Electronics Letters, May 10, 1984.

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