Automatic testing device and method of phase delay of quarter-wave plate for all-fiber current transformer
A technology of automatic testing device and current transformer, which is applied in measuring devices, instruments, measuring electrical variables, etc., can solve problems such as the inability to establish an accurate temperature model of sensing optical fiber, achieve good optical path reciprocity, improve testing efficiency, and improve The effect of test accuracy
Active Publication Date: 2019-02-22
ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER +3
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Problems solved by technology
[0005] In order to solve the problem that there is no practical method for testing the phase delay of the optical fiber 1 / 4 wave plate at present, and it is impossible to establish an accurate temperature model for mutual compensation with the sensing optical fiber Verdet coefficient, the present invention proposes a 1 / 4 4 wave plate phase delay automatic test device, which can automatically test the phase delay of 1 / 4 wave plate
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[0041] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0042] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0043] Explanation of terms:
[0044] MZI: Mach-Zehnder interferometer, Mach-Zehnder interference.
[0045] Ve...
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The invention discloses an automatic testing device and method of phase delay of a quarter-wave plate for an all-fiber current transformer. The device comprises a broad spectrum light source connectedwith a first coupler. One output tail fiber of the first coupler is fused with one input tail fiber of a second coupler by a Mach-Zehnder interference reference phase arm; the other output tail fiberof the first coupler is in a 45-dgree-countershaft fusing relationship with one end of a to-be-tested quarter-wave plate; and the other end of the to-be-tested quarter-wave plate is in a 45-dgree-countershaft fusing relationship with the other input tail fiber of the second coupler. The to-be-tested quarter-wave plate and a connected fusing point are arranged in space with the adjustable and stable temperature. Two beams of light outputted by the first coupler enter the second coupler after different phase delays and make the interference in the second coupler; and the light under the interference is outputted to corresponding detectors respectively through two output tail fibers of the second coupler; and the detector transmits the light to a processor to calculate a phase delay of the quarter-wave plate under a current temperature.
Description
technical field [0001] The invention belongs to the field of optical fiber current transformers, in particular to a 1 / 4 wave plate phase delay automatic testing device and method for all optical fiber current transformers. Background technique [0002] The transformer is an important device for monitoring the operation status of the power grid. The measurement, monitoring and protection control in the substation rely on it to obtain the current, voltage and other information required for measurement, measurement and protection. Traditional electromagnetic transformers have problems such as weak electrical insulation, bulky volume, small dynamic range, and ferroresonant overvoltage to maintain certain accuracy and linearity in a wide range. With the continuous development and advancement of digital substation smart grids, all-fiber current transformers are increasingly favored by smart grid construction due to their unique advantages that are different from traditional electr...
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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 袁志军靳俊杰林海丹钱文晓肖冰秘立鹏敖明孙友群司磊王利清
Owner ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER