CN202066892U

CN202066892U - Novel polarized photon crystal current probe

Info

Publication number: CN202066892U
Application number: CN201120155059XU
Authority: CN
Inventors: 张振一
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2011-05-16
Filing date: 2011-05-16
Publication date: 2011-12-07
Anticipated expiration: 2021-05-16

Abstract

The utility model discloses a novel polarized photon crystal current probe which comprises a sealed mechanical capsulation structure, wherein a photon crystal, a polarization detector, an MCU (microcontroller unit), a polarization controller and an AD/DA (analog-digital/digital-analog) conversion module are sealed in the mechanical capsulation structure and are mutually connected in sequence. The novel polarized photon crystal current probe mainly adopts a novel crystal which has excellent magnetic-optic effect; and according to the maxwell equation, the current generates a magnetic field. The magnetic field lead the internal structure to directly act on the magneto-optic crystal, and finally, the polarization state change of the light is measured so as to test the current.

Description

Novel polarized photon crystal current probe

Technical field

The utility model belongs to the forceful electric power technical field, relates to a kind of current probe, relates in particular to a kind of novel polarized photon crystal current probe.

Background technology

In the forceful electric power industry, along with the fast development of civilian power system, the main line capacity is increasing, and transmission network voltage is more and more higher; In the light current industry, the design level of circuit board is more and more higher, and message transmission rate is more and more faster, needs to carry out strict various tests in measurement at ordinary times, to guarantee reaching expectation index in design is produced.

Current probe is to be used for current value on measuring circuit plate and the circuit.Present electronic industry high speed development has proposed stern challenge for traditional testing current scheme, also more and more needs high bandwidth, high sensitivity, current with high accuracy testing scheme in the industry.

Present most current test method is for using the reometer test, and this method need be cut off test cable, and two ends is inserted on the two poles of the earth of reometer, shows real-time current value by reading.But this method also has very big shortcoming.Owing to the inner structure reason of reometer, make its electric current of surveying have tangible error, so can not reach high precision, in addition because the reometer corresponding speed is slow, can't test the continually varying electric current,, can not reach very high test bandwidth even can test.

The utility model content

Technical problem to be solved in the utility model is: a kind of novel polarized photon crystal current probe is provided, has good magneto-optic effect.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of novel polarized photon crystal current probe, described current probe comprises the mechanical encapsulation structure of sealing, is sealed with photonic crystal, Polarization Detection device, MCU, Polarization Controller, AD/DA modular converter in this mechanical encapsulation structure; Described photonic crystal, Polarization Detection device, MCU, Polarization Controller, AD/DA modular converter connect successively.

As a kind of preferred version of the present utility model, described photonic crystal is near an end setting of mechanical encapsulation structure; Described mechanical encapsulation structure comprises a hook, and this hook is arranged on the end near photonic crystal.

As a kind of preferred version of the present utility model, described mechanical encapsulation structure is a hollow housing.

As a kind of preferred version of the present utility model, described current probe further comprises light source drive, and photonic crystal, Polarization Detection device, MCU, light source drive, Polarization Controller, AD/DA modular converter connect successively.

The beneficial effects of the utility model are: the novel polarized photon crystal current probe that the utility model proposes, mainly used a kind of novel crystal, and this crystal has good magneto-optic effect, and according to Maxwell equation, electric current will produce magnetic field.Magnetic field causes inner structure to directly act on magneto-optical crystal, thereby by measuring the polarization state of light variation electric current is tested at last.

Description of drawings

Fig. 1 is the use synoptic diagram of polarized photon crystal probe.

Fig. 2 is a polarized photon crystal probe inner structure synoptic diagram.

Fig. 3 is polarized photon crystal probe principle and module diagram.

Fig. 4 is the outer portion connecting structure figure of polarized photon crystal probe.

The accompanying drawing mark is as follows:

21: lead, direction of current is shown in the figure direction of arrow;

22: mechanical encapsulation structure (probe body shell);

23:DA capture card circuit board;

24: the Polarization Control drive circuit board;

25: photonic crystal.

41: the photonic crystal probe;

42: light source output polarization maintaining optical fibre and driving power input cable;

43: concentric cable;

44: oscillograph;

45: light source and driving power.

Embodiment

Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Embodiment one

See also Fig. 1, Fig. 2, Fig. 3, the utility model has disclosed a kind of novel polarized photon crystal current probe, described current probe comprises the mechanical encapsulation structure 22 of sealing, is sealed with AD/DA modular converter 23, Polarization Control drive circuit board 24, photonic crystal 25 in this mechanical encapsulation structure 22 and connects successively.

Integrated Polarization Detection device, MCU, light source drive, Polarization Controller in the Polarization Control drive circuit board 24; Described photonic crystal, Polarization Detection device, MCU, light source drive, Polarization Controller, AD/DA modular converter connect successively.

Described mechanical encapsulation structure is a hollow housing.Described photonic crystal is near an end setting of mechanical encapsulation structure; Described mechanical encapsulation structure comprises a hook, and this hook is arranged on the end near photonic crystal.

Embodiment two

Present embodiment has disclosed a kind of novel polarized photon crystal current probe, and the composition and the principle of current probe are as follows:

[the Lights section]

The Lights section adopts the communication light source module of 1550nm wavelength, and this module has advantages such as volume is little, relative power is big, can drive by simple circuit module, and by the adjusting watt level, range that can the Control current table.

[light path part]

Inside at current probe, all Transmission Fibers all adopt panda protecting polarized light fiber, because in the interferometric optical fiber sensor based on the optical polarization detection, use polarization maintaining optical fibre can guarantee that linear polarization is constant, improve relevant signal to noise ratio, to realize high-acruracy survey to electric current.

[physical construction]

Through Machine Design, optical fiber is encapsulated fully, be convenient outdoor measurement, adopt IP66 waterproof specification.Adopt insulating material, to prevent interference such as EMI.This physical construction can make magneto-optical crystal press close to transmission line most probably electric wire outer ring parcel, can farthest reduce error.

[principle design]

Core sensor of the present utility model is the inner magneto-optical crystal of probe, this crystal by adopting Yttrium iron garnet material, this material has good magneto-optic effect at the 1550nm wave band, be Faraday effect: when linearly polarized light sees through the material of placing in the magnetic field, when magnetic direction is propagated, the phenomenon that polarization surface rotates is noted by abridging and is MCB.Faraday's rotation (representing with rotation angle θ F) and sample length 1, magnetic induction density B have the following θ of relation F=VlB, and V is and physical property, the relevant constant of light frequency, is called Verdet constant.

And there is the H=nI/L relation in electric current in magnetic field, and wherein H is a magnetic field intensity, and n is a coil turn, and I is a strength of current, and L is a loop length.Hence one can see that, and there is proportional relation in θ F in strength of current, can measure strength of current by monitoring faraday rotation angle thus.

[data processing section]

Can again faraday's rotation angle be converted into voltage quantities by elements such as analyzers, link to each other in oscillograph by BNC connector, because oscillograph is based on voltage measurement, therefore the signal bandwidth of this probe will be determined by oscillograph.

1. direction of current such as Fig. 1 arrow direction.The user can be with probe sheath on electric wire 21, because light also is electromagnetic wave, can learn the magnetic field that the electric current of variation changes according to Maxwell equation, constant electric current produces constant magnetic field, so electric current excitation electromagnetic field, the electric field excitation photonic crystal produces Faraday effect, makes light signal generating faraday swing angle.

2. light signal is through the Polarization Detection device, and the Polarization Detection device detects polarization state, through relatively obtaining faraday's swing angle, thereby obtains the value of magnetic field intensity, behind the MCU acquisition module, is converted into digital voltage signal output, enters oscillograph inside.

3. because light source power is bigger, and oscillograph 44 active probes can not drive, as shown in Figure 4, so adopt external connection module, it is inner to enter probe through polarization maintaining optical fibre, and then passes through photonic crystal.Photonic crystal probe 41, concentric cable 43, oscillograph 44, light source and driving power 45, light source output polarization maintaining optical fibre and driving power input cable 42 connect successively.

In sum, the novel polarized photon crystal current probe that the utility model proposes has mainly been used a kind of novel crystal, and this crystal has good magneto-optic effect, and according to Maxwell equation, electric current will produce magnetic field.Magnetic field causes inner structure to directly act on magneto-optical crystal, thereby by measuring the polarization state of light variation electric current is tested at last.

Here description of the present utility model and application are illustrative, are not to want with scope restriction of the present utility model in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present utility model or essential characteristic, and the utility model can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the utility model scope and spirit, can carry out other distortion and change here to disclosed embodiment.

Claims

1. a novel polarized photon crystal current probe is characterized in that described current probe comprises the mechanical encapsulation structure of sealing;

Be sealed with photonic crystal, Polarization Detection device, MCU, Polarization Controller, AD/DA modular converter in this mechanical encapsulation structure;

Described photonic crystal, Polarization Detection device, MCU, Polarization Controller, AD/DA modular converter connect successively.

2. novel polarized photon crystal current probe according to claim 1 is characterized in that:

Described photonic crystal is near an end setting of mechanical encapsulation structure; Described mechanical encapsulation structure comprises a hook, and this hook is arranged on the end near photonic crystal.

3. novel polarized photon crystal current probe according to claim 1 is characterized in that:

Described mechanical encapsulation structure is a hollow housing.

4. novel polarized photon crystal current probe according to claim 1 is characterized in that:

Described current probe further comprises light source drive, and photonic crystal, Polarization Detection device, MCU, light source drive, Polarization Controller, AD/DA modular converter connect successively.