Optics: measuring and testing – By polarized light examination – With polariscopes
Patent
1982-12-22
1986-01-07
Willis, Davis L.
Optics: measuring and testing
By polarized light examination
With polariscopes
324 96, G01J 400
Patent
active
045630933
ABSTRACT:
A voltage and electric field measuring device is disclosed. The device uses light, including a polarizer, an electro-optic crystal consisting of a material having an optical rotatory power, and an analyzer arranged in the stated order in the direction of advancement of applied light, with a quarter-wave plate being disposed between the polarizer and crystal or between the crystal and analyzer. The angle of orientation .psi. of the analyzer, relative to the optical axis of the crystal, is set to the product of .theta. and l, where .theta. represents the optical rotatory power, with respect to the applied light, of the crystal near a point at the center of a range of varying temperatures at the installation environment, and l represents the thickness of the crystal measured in the direction of advancement of light. The specified relation between .psi. and .theta..multidot.l maximizes the temperature stability of the device.
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patent: 4465969 (1984-08-01), Tada et al.
Hamasaki et al., "Optical Fiber Sensor for the Measurement of Electric Field Intensity and Voltage (OPSEF)", Fiber and Integrated Optics, vol. 3, No. 4, pp. 383-389, 1981.
IEEE Transaction on Power Apparatus and Systems, vol. PAS-99, No. 3, May/Jun. 1980 The Use of Fiber Optics for Communications, Measurement and Control Within High Voltage Substantiations".
Nissin Denkigiho, vol. 24, No. 2, (Apr. 1979), "Voltage Measuring Device Using Laser".
Electrical Review, vol. 201, No. 11, Sep. 16, 1977, Optical Methods for Measurement of Current and Voltage at High Voltage.
Electronics Letters, 4-15-82, vol. 18, No. 8, pp. 327-328, Electric Field Sensitive Optical Fibre Using Piezoelectric Polymer Coating.
Kawakami Akihiko
Kuhara Yoshiki
Tada Kohji
Tatsumi Masami
Koren Matthew W.
Sumitomo Electric Industries Ltd.
Willis Davis L.
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