Patent
Fiber optic sensor array and method
TLDR
In this article, a fiber optic sensor array (10) comprises a single transmit optical fiber (14) for guiding an incident optical signal through a plurality of sensing segments (20A, 20B, 20C) arranged in a series array.Abstract:
A fiber optic sensor array (10) comprises a single transmit optical fiber (14) for guiding an incident optical signal through a plurality of sensing segments (20A, 20B, 20C) in the transmit optical fiber (14) arranged in a series array. The sensor array (10) may include a single return optical fiber (16), or the sensors may be arranged in groups (20A, 202B, 202C) with all the member of one group (202A) being connected to a corresponding return fiber (212). Optical couplers (18A, 18B, 18C) formed between the transmit (14) and return optical fibers (16) couple a portion of the incident signal into the return fiber (16) after the signal propagates through each sensing segment (20A, 20B, 20C). A loop (100A, 100B, 100C) is formed in the transmit fiber at each optical coupler (18A, 18B, 18C) so that the incident signal travels through the sensing segments in one direction and through the return fiber in the opposite direction. The couplers may be identical and may be have either symmetrical or asymmetrical coupling coefficients. Asymmetrical couplers (290, 308, 310) may be used to attenuate the intensities of undesired signals that recirculate in the loops of the array.read more
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References
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Patent
Optical sensing apparatus and method
TL;DR: A sensor for measuring stress, temperature, pressure, sound, etc. as mentioned in this paper is composed of a light source which injects light into one end of a waveguide, a deformer contacting and deforming the waveguide to cause light to couple from originally excited modes to other modes, and an optical detector to detect the change in light coupling caused by deformation.
Patent
Device for coupling radiation into an optical waveguide
TL;DR: In this paper, an optical device coupling light between a first-light waveguide and either a second light waveguide or a radiation source characterized by the first waveguide having a core of a predetermined cross-sectional area, a reflective layer or mirror of a high reflectance being disposed on an angle to the axis of the waveguide, so that only a small portion of the light traveling in the core will be blocked by the presence of the mirror.
Journal ArticleDOI
Phase compensation in interferometric fiber-optic sensors
Anthony Dandridge,Alan B. Tveten +1 more
TL;DR: A new method of keeping interferometric fiber-optic sensor systems in quadrature by tuning the emission frequency of the laser-diode source is described, which has a better than 10-rad sensitivity and a usable tracking range.
PatentDOI
Stable fiber-optic hydrophone
TL;DR: In this article, the authors describe an optical fiber hydrophone system in which a single optical fiber is used for all of the acoustical sensors in the system, each sensor is in the form of a sensing portion of the single optical fibre.
Patent
Optical fiber launch coupler
John P. Palmer,Phillip B. Ward +1 more
TL;DR: In this paper, a low-loss unidirectional optical coupler utilizing monofilament fibers of different diameters is provided by mounting each fiber on a curved surface, lapping the smaller (launch) fiber substantially tangentially to the curved surface until the core of the launch fiber has been lapped through to produce two elliptical flat surfaces, independently lapping other (throughput) fiber tangentially on its surface to produce a fiber surface of substantially the same size as one of those produced on the launch fibre, aligning the throughput fiber surface with one of the