Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1994-03-28
1996-04-16
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
256 355, G01B 902
Patent
active
055088040
ABSTRACT:
An interferometer strain sensor or gauge comprises a laser diode coupled to an interferometer with an opto-electric output converter, the output of which is supplied via a differentiating unit to an interference-fringe counter and via a feedback amplifier to the current supply of the laser diode to vary the wavelength thereof, the interference signal being in the form of a saw-tooth pattern with steep edges to produce rapid transitions for the differentiating unit.
REFERENCES:
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patent: 5066128 (1991-11-01), Lu
patent: 5117471 (1992-05-01), Furstenau
patent: 5402230 (1995-03-01), Tian et al.
"Laser Diode Feedback Interferometer for Stabilization and Diplacement Measurements"; By: Toshihiko Yoshino; M. Nara; Sergay Mnatzakanian; Byron S. Lee; and Timothy C. Strand; Applied Optics; 1st Mar. 1987; pp. 892p14 897.
"Bistable Fiber-Optic Michelson Interferometer That Uses Wavelength Control"; By: Norbert Furstenau; Optic Letters; 1991; pp. 1896-1898, 1029 (1992).
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"Interrogation of a Remote Elliptical-Core Dual-Mode Fiber Strain Sensor by Using a Tandem Interferometer Configuration"; By: K. Bohnert; G. de Wit; and J. Nehring; Optic Letters; 1992; pp. 694-696.
"Remote Temperature Sensing Using Polarisation-Preserving Fibre"; By: M. Corke; A. D. Kersey; K. Liu; and D. A. Jackson; Electronic Letters Jan. 19, 1984 vol. 20 No. 2; pp. 68-69.
"Interferometric Optical Fibre Strain Measurement"; By: D. Uttam; B. Culshaw; J. D. Ward and D. Carter; J. Phys. E. Sci. Instrum. vol. 18, 1985; pp. 290-293.
"Elliptical Core Two-Mode Fiber Strain Gauge With Heterodyne Detection" By: J. N. Blake; Q. Li; and B. Y. Kim; Optical Fiber Sensors 1988 Technical Digest Series, vol. 2, Part. 1; Jan. 27-29, 1988; pp. 416-419.
Deutsche Forschungsanstatt fur Luft- und Raumfahrt e.V.
Kim Robert
Turner Samuel A.
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