A miniature three-dimensional optical electric field sensing system

Abstract

The invention discloses a miniature three-dimensional optical electric field sensing system, comprising a tunable fiber laser, a 1×3 fiber coupler, a three-dimensional electric field probe, a photodetector and an oscilloscope; wherein the tunable fiber laser is connected to the 1×3 fiber coupler through an optical fiber, the 1×3 fiber coupler is connected to the three-dimensional electric field probe through an optical fiber, the three-dimensional electric field probe is connected to the photodetector through an optical fiber, and the photodetector is connected to the oscilloscope through a cable; wherein the three-dimensional electric field probe comprises an x / y / z direction electric field sensor and a shell for packaging; the x / y / z direction electric field sensor comprises a pair of fiber self-focusing lenses and an electric field sensing probe arranged between the two fiber self-focusing lenses, the x / y / z direction electric field sensors have the same posture in the shell, and the electric field sensitive directions of the electric field sensing probe of the x / y / z direction electric field sensor are respectively in the x direction, the y direction and the z direction. The three-dimensional electric field probe of the system has a small volume, is not affected by electromagnetics in measurement, has a wide frequency response range and a large dynamic range.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic field measurement, and in particular to a miniature three-dimensional optical electric field sensing system. Background Art

[0002] Pulse electric field sensing technology is an important means of quantitatively evaluating the anti-interference test research of various electronic devices, and it is also the basis for studying the mechanism of electromagnetic damage and protective measures. The commonly used electric field measurement sensor is the D-dot pulse electric field sensor, also known as the electric small pole antenna, which is a direct antenna induction pulse electric field sensor. Its measurement principle is to use the antenna to induce a charge or voltage signal in the electric field of the measured space, and obtain the measured field strength value by detecting the voltage. This type of electric field sensor has a simple structure and is a relatively mature electric field measurement method. The disadvantage is that the D-dot sensor probe and the transmission cable are both metal conductors, which are not only susceptible to electromagnetic interference, but also have poor electrical safety. At the same time, due to the inherent bandwidth defects of the antenna structure, it is impossible to simultaneously meet the measurement of low-frequency (several Hz) and ultra-high-frequency (above GHz) pulse electric field signals. Finally, due to the directivity of conventional antennas, most electric field sensors can only perform one-dimensional directional electric field measurements. In the prior art, three-dimensional electric field measurement is generally composed of three mutually perpendicular and orthogonal electric field sensors, which are not only large in size, but also the placement of the sensor device will have a great influence on the electric field distribution, thereby causing large measurement errors. Summary of the invention

[0003] The object of the present invention is to provide a miniature three-dimensional optical electric field sensing system to reduce the volume of an electric field sensing probe.

[0004] In order to solve the above technical problems, the present invention provides a technical solution: a miniature three-dimensional optical electric field sensing system, comprising a tunable fiber laser, a 1×3 fiber coupler, a three-dimensional electric field probe, a photodetector and an oscilloscope; wherein the tunable fiber laser is connected to the 1×3 fiber coupler through an optical fiber, the 1×3 fiber coupler is connected to the three-dimensional electric field probe through an optical fiber, the three-dimensional electric field probe is connected to the photodetector through an optical fiber, and the photodetector is connected to the oscilloscope through a cable;

[0005] The three-dimensional electric field probe includes an x-direction electric field sensor, a y-direction electric field sensor, a z-direction electric field sensor and a shell for packaging; the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor each include a pair of optical fiber self-focusing lenses and an electric field sensing probe arranged between the two optical fiber self-focusing lenses, the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor have the same posture in the shell, and the electric field sensitive directions of the electric field sensing probes of the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor are respectively in the x-direction, the y-direction and the z-direction.

[0006] According to the above scheme, the optical path propagation direction in the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor is parallel to the z-direction, and the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor are evenly distributed along the y-direction.

[0007] According to the above solution, the shell is a polytetrafluoroethylene rectangular box.

[0008] According to the above scheme, the electric field sensing probe is formed by combining a titanium dioxide film, a magnesium fluoride film and an electro-optic polymer film in a certain manner and stacking them on a glass substrate.

[0009] According to the above scheme, the structure of the electric field sensing probe is that a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, an electro-optic polymer film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, and a magnesium chloride film are sequentially arranged on a glass substrate.

[0010] A method for preparing an electro-optic polymer film in the micro three-dimensional optical electric field sensing system described above comprises the following steps:

[0011] S1, doping AJ-CKL1 electro-optical chromophore molecules into polycarbonate at a certain doping concentration;

[0012] S2, dissolving the polycarbonate doped with the AJ-CKL1 electro-optical chromophore molecule in a cyclopentanone solvent;

[0013] S3, using a coating machine to spin-coat the solution obtained in S2 to obtain an electro-optic polymer film;

[0014] S4. The electro-optic polymer film is heated to a certain temperature, and at the same time, the electro-optic polymer film is placed in an electric field environment with a certain electric field strength for polarization.

[0015] The beneficial effects of the present invention are as follows: since the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor in the system are arranged in the same posture and the electric field sensitive directions are perpendicular to each other, compared with the prior art method of arranging electric field sensors with the same electric field sensitive directions in different postures, the three-dimensional electric field probe of the present invention can have a smaller volume, and since optical fiber is used for signal transmission, the three-dimensional electric field probe does not contain metal components, the test results of the system are not affected by electromagnetic interference, and the frequency response range is wide and the dynamic range is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a micro three-dimensional optical electric field sensing system according to an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of a three-dimensional electric field probe according to an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of an electric field sensor according to an embodiment of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of an electric field sensor probe according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0021] See also Figure 1 to Figure 4 A miniature three-dimensional optical electric field sensing system, comprising a tunable fiber laser, a 1×3 fiber coupler, a three-dimensional electric field probe, a photodetector and an oscilloscope; wherein the tunable fiber laser is connected to the 1×3 fiber coupler via an optical fiber, the 1×3 fiber coupler is connected to the three-dimensional electric field probe via an optical fiber, the three-dimensional electric field probe is connected to the photodetector via an optical fiber, and the photodetector is connected to the oscilloscope via a cable;

[0022] The three-dimensional electric field probe includes an x-direction electric field sensor, a y-direction electric field sensor, a z-direction electric field sensor and a shell for packaging; the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor each include a pair of optical fiber self-focusing lenses and an electric field sensing probe arranged between the two optical fiber self-focusing lenses, the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor have the same posture in the shell, and the electric field sensitive directions of the electric field sensing probes of the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor are respectively in the x-direction, the y-direction and the z-direction.

[0023] Further, the propagation direction of the light paths in the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor is parallel to the z-direction, and the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor are evenly distributed along the y-direction.

[0024] Furthermore, the shell is a polytetrafluoroethylene rectangular box with an outer dimension of 1mm×1mm×30mm.

[0025] Furthermore, the electric field sensing probe is formed by combining a titanium dioxide film, a magnesium fluoride film and an electro-optic polymer film in a certain manner and stacking them on a glass substrate.

[0026] Furthermore, the structure of the electric field sensing probe is that a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, an electro-optical polymer film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, and a magnesium chloride film are sequentially arranged on a glass substrate; wherein the thickness of the titanium dioxide film is 149 nm, the thickness of the magnesium chloride film is 281 nm, the thickness of the electro-optical polymer film is 387.5 nm, and the size of the glass substrate is 1 mm×1 mm×0.2 mm.

[0027] The process of measuring the electric field using the above-mentioned micro three-dimensional optical electric field sensing system is as follows: first, turn on the tunable laser, observe the output value of the photodetector displayed on the oscilloscope, and fix the output wavelength of the laser within the linear coupling region of the output spectrum of the three-dimensional electric field probe; then, place the three-dimensional electric field probe in the electric field to be measured. At this time, the change in the output waveform on the oscilloscope reflects the time domain waveform of the electric field to be measured.

[0028] A method for preparing an electro-optic polymer film in the micro three-dimensional optical electric field sensing system described above comprises the following steps:

[0029] S1, doping AJ-CKL1 electro-optical chromophore molecules into polycarbonate at a doping concentration of 25%;

[0030] S2, dissolving the polycarbonate doped with the AJ-CKL1 electro-optical chromophore molecule in a cyclopentanone solvent;

[0031] S3, using a coating machine to spin-coat the solution obtained in S2 to obtain an electro-optic polymer film;

[0032] S4, heating the electro-optic polymer film to 110°C, and placing the electro-optic polymer film in an electric field environment of 100V / μm for polarization; the polarization direction is set to x, y, and z according to the electric field sensitive direction required by the electric field sensor.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A miniature three-dimensional optical electric field sensing system, Features: It includes a tunable fiber laser, a 1×3 fiber coupler, a three-dimensional electric field probe, a photodetector and an oscilloscope; wherein the tunable fiber laser is connected to the 1×3 fiber coupler through an optical fiber, the 1×3 fiber coupler is connected to the three-dimensional electric field probe through an optical fiber, the three-dimensional electric field probe is connected to the photodetector through an optical fiber, and the photodetector is connected to the oscilloscope through a cable; The three-dimensional electric field probe comprises an x-direction electric field sensor, a y-direction electric field sensor, a z-direction electric field sensor and a shell for packaging; the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor each comprise a pair of optical fiber self-focusing lenses and an electric field sensing probe disposed between the two optical fiber self-focusing lenses; the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor have the same posture in the shell; the electric field sensitive directions of the electric field sensing probes of the x-direction electric field sensor, the y-direction electric field sensor and the z-direction electric field sensor are respectively in the x-direction, the y-direction and the z-direction; The propagation direction of the optical paths in the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor is parallel to the z-direction, and the x-direction electric field sensor, the y-direction electric field sensor, and the z-direction electric field sensor are evenly distributed along the y-direction; The shell is a polytetrafluoroethylene rectangular box.

2. The micro three-dimensional optical electric field sensing system according to claim 1, Features: The electric field sensing probe is formed by combining a titanium dioxide film, a magnesium fluoride film and an electro-optic polymer film in a certain way and stacking them on a glass substrate.

3. The micro three-dimensional optical electric field sensing system according to claim 2, Features: The structure of the electric field sensing probe is that a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, an electro-optic polymer film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, a magnesium chloride film, a titanium dioxide film, and a magnesium chloride film are sequentially arranged on a glass substrate.

4. A method for preparing an electro-optic polymer film in a micro three-dimensional optical electric field sensing system according to any one of claims 2 or 3, Features: The following steps are included: S1, doping AJ-CKL1 electro-optical chromophore molecules into polycarbonate at a certain doping concentration; S2, dissolving the polycarbonate doped with the AJ-CKL1 electro-optical chromophore molecule in a cyclopentanone solvent; S3, using a coating machine to spin-coat the solution obtained in S2 to obtain an electro-optic polymer film; S4. The electro-optic polymer film is heated to a certain temperature, and at the same time, the electro-optic polymer film is placed in an electric field environment with a certain electric field strength for polarization.

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