High-sensitivity fiber grating electric field sensor

Abstract

The invention discloses a high-sensitivity fiber grating electric field sensor. The high-sensitivity fiber grating electric field sensor comprises an upper metal hemisphere and a lower metal hemisphere; a sensitization amplification mechanism, an optical fiber and an insulating plate are arranged between the upper and lower metal hemispheres; through the two metal hemispheres, electric field signals are sensed; and the design of the sensitization amplification mechanism uses an inverse piezoelectric effect and amplification type sensitization combined method, so that the sensitization effect is more obvious. Voltage signals are transferred to the sensitization amplification mechanism through a lead, so that the sensitization amplification mechanism deforms mechanically; through amplification of the sensitization amplification mechanism, a relatively large deformation amount is output and acts on the optical fiber, so that the central wavelength of the optical fiber changes; and throughdetecting wavelength drift distance, to-be-detected electric field intensity is obtained. The fiber grating sensor is remarkably in sensitization effect, small in volume, wide in application range and suitable for micro strain measurement of structures.

Description

technical field [0001] The invention belongs to the technical field of electric field sensors, and in particular relates to a high-sensitivity optical fiber grating electric field sensor. Background technique [0002] Fiber Bragg grating sensor is an important direction of current sensor research. With the rapid development of the world's military industry, aerospace and other fields, the sensitivity of electric field detection sensors is getting higher and higher. There are various electric fields in space, and the radiation generated by various electrical equipment also constitutes background noise for the detection of sensors. But the target electric field is often very weak, which requires the sensor to respond to the weak electric field. At present, electronic electric field sensor devices are all hand-held single-point measurements, or need to use optical fiber after photoelectric conversion to transmit the measurement data to the monitoring center. [0003] Compared...

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Problems solved by technology

[0004] In many fiber grating electric field sensor structures, most of them directly use piezoelectric material as the sensitive unit. The piezoelectric material deforms under the action of the electric field, and then the deformation directly acts on the fiber grating. However, the deformation of the piezoelectric material is small, and its electric field poor resolution

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