Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1995-06-02
1997-06-03
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
G01B 902
Patent
active
056360215
ABSTRACT:
A Sagnac/Michelson distributed sensor is described that is capable of locating the position and amplitude of a time varying environmental signal as well as measuring locally and regionally slowly varying environmental signals. The sensor consists of a Sagnac interferometric loop into which spectrally reflective elements that may be fiber gratings have been placed. A Sagnac interferometric signal derived from counterpropagating beams in the Sagnac loop is used in combination with signals derived from reflected light beams off the spectrally reflective elements in the Sagnac loop which are combined in Michelson interferometer readouts to allow the measurement of environmental signals. Applications of the Sagnac/Michelson sensor include the measurement strains and acoustic sources in buildings, bridges, dams and aerospace platforms. Other applications include the localization of insect infestations in grain storage areas and termites in wooden structures.
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Dakin et al, SPIE, 1997, pp 325-328.
Finch George W.
Turner Samuel A.
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