Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1993-03-22
1995-09-19
Hille, Rolf
Optics: measuring and testing
By particle light scattering
With photocell detection
356350, 356346, 25022712, G01B 902, G01C 1964
Patent
active
054520860
ABSTRACT:
An interferometer amplitude modulation reduction circuit coupled to receive an interferometer output signal from the output of a fiber optic interferometer sensor. The interferometer sensor is excited by a frequency modulated input light signal from a light source having an unwanted amplitude modulation and intensity noise signal component. The interferometer output signal has both wanted interference induced intensity modulation and also unwanted amplitude modulation and intensity noise from the unwanted amplitude modulation and intensity noise signal components present on the frequency modulated input light signal. The invention circuit has a sampling means for sampling a sample portion of the frequency modulated input light signal from the output of the light source. The sampling means detects and the sample portion signal to provide a detected sample intensity signal having a detected unwanted amplitude modulation and intensity noise signal component. A detector detects the interferometer output signal from the output of the fiber optic interferometer sensor and converts the interferometer output signal into a detected AM modulated phase-generated carrier signal containing a detected unwanted amplitude modulation and intensity noise signal component. A divider scales and divides the detected AM modulated phase-generated carrier signal by the detected sample intensity signal to provide a corrected interferometer output signal. The detected unwanted amplitude modulation and intensity noise signal components common to both the detected sample intensity signal and the detected AM modulated phase-generated carrier signal are substantially canceled by the division process.
REFERENCES:
patent: 3699463 (1972-10-01), Stone
patent: 4872754 (1989-10-01), Ensley
patent: 4883358 (1989-11-01), Okada
patent: 4998295 (1991-03-01), Siegel
patent: 5062153 (1991-10-01), Turpin et al.
patent: 5166988 (1992-11-01), Bobb et al.
patent: 5245461 (1993-09-01), Fitzmartin
patent: 5283625 (1994-02-01), Bunn, Jr.
patent: 5321503 (1994-06-01), Bramson
IEEE, "Homodyne Demodulation Scheme for Fiber Optic Sensors Using Phase Generated Carrier" Dandridge et al. Apr. 1, 1982.
Hille Rolf
Kirk James F.
Litton Systems Inc.
Martine, Jr. Chester E.
Williams Alexander Oscar
LandOfFree
Interferometer amplitude modulation reduction circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Interferometer amplitude modulation reduction circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interferometer amplitude modulation reduction circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1832546