CN205539130U - High sensitivity optic fiber current sensing device based on circulation circuit - Google Patents
High sensitivity optic fiber current sensing device based on circulation circuit Download PDFInfo
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- CN205539130U CN205539130U CN201620357946.8U CN201620357946U CN205539130U CN 205539130 U CN205539130 U CN 205539130U CN 201620357946 U CN201620357946 U CN 201620357946U CN 205539130 U CN205539130 U CN 205539130U
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- optical fiber
- closed circuit
- photoswitch
- linear polarization
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Abstract
The utility model provides a high sensitivity optic fiber current sensing device based on circulation circuit, includes: mechanism, 22 photoswitch and sensing fiber take place for linear polarization pulse light generation mechanism, control impuls, wherein: the mechanism takes place with linear polarization pulse light generation mechanism and control impuls respectively and links to each other with receiving line polarization pulse light sum control impuls for the first input end of photoswitch and first output, and control impuls takes place the mechanism and links to each other and export modulating pulse, second input and the second output and the sensing fiber constitution circulation circuit of photoswitch with linear polarization pulse light generation mechanism. The utility model discloses can realize faraday effect accumulation many times, the accumulation number of times exceedes and the loss of system's loop is less more than 10 times, is consequently showing improvement system sensitivity and stability.
Description
Technical field
The utility model relates to the technology of a kind of field of photodetection, specifically one and can apply to electric power transmission, intelligence
Electrical network, the high-performance of power transformation control, the high sensitivity optical fiber current sensor device based on closed circuit of high reliability.
Background technology
Fibre optic current sensor (Fiber-Optic Current Sensors, FOCS), utilizes magneto-optic effect (Faraday effect) to measure
Electric current, due to the advantage of its uniqueness, such as intrinsic insulating properties, lightweight and to the immunity of degeneration magnetic field.But limit at present its actual should
Include with the two of technology main obstacles: this sensor is for variations in temperature and the sensitivity of vibration, and is determined by Verdet constant
The insensitivity in fixed silicon materials magnetic field.Many researchs are improved to system design aspect from improving optical fiber medium.Grind
Study carefully and report that using circular brief-ringence to spin fiber reduces its sensitivity environment, uses specialty fibers such as flint glass, rear-earth-doped glass fibre
Sensitivity is improved with big Fil moral New Magnetic Field Controlled fluid content.But, these special fibres are the most much more expensive, extremely difficult fabricate.
On the other hand, sensor-based system utilize Sagnac or circulus also to have been reported that the interaction by being effectively improved optical fiber and magnetic field is long
Degree, improves sensitivity.
Utility model content
This utility model uses for prior art and declines that to swing structure therefore circulation losses higher, can only realize the faraday of a small amount of number of times
Effect accumulates thus causes the deficiency such as limited grade of the raising to sensing sensitivity, proposes a kind of high sensitivity optical fiber based on closed circuit electricity
Spread induction device, use closed circuit based on fast optical switch, can repeatedly realize Faraday effect accumulation, and system loop
Loss less, it is possible to achieve accumulation number of times more than more than 10 times, therefore significantly improve system sensitivity and stability.
This utility model is achieved through the following technical solutions:
This utility model includes: linear polarization pulsed light generating mechanism, control impulse mechanism, the photoswitch of 2 × 2 and biography
Photosensitive fibre, wherein: the first input end of photoswitch and the first outfan are sent out with linear polarization pulsed light generating mechanism and control pulse respectively
Life structure is connected to receive linear polarization pulsed light and controls pulse, controls impulse mechanism and is connected with linear polarization pulsed light generating mechanism
And exporting modulation pulse, the second input of photoswitch and the second outfan form closed circuit with sensor fibre.
Described linear polarization pulsed light generating mechanism includes: light source, manipulator and the polarizer being sequentially connected, wherein: the polarizer
Output lead polarized pulses light receives from the modulation pulse controlling impulse mechanism to the first input end of photoswitch, manipulator.
Described control impulse mechanism includes: analyzer, photodetector, signal processing unit and the pulse being sequentially connected
Generator, wherein: the voltage signal that photodetector is obtained by signal processing unit is acquired and processes, analytic signal amplitude
Change obtains the pulse polarization variations information caused affected by magnetic fields and exports to pulse generator, and pulse generator is respectively to linear polarization
The output modulation pulse of pulsed light generating mechanism is to produce light pulse, to photoswitch output control pulse to control light pulse at closed circuit
In circulation time.
Technique effect
Compared with prior art, this utility model employs 2 × 2 photoswitches to build loop, has used special control arteries and veins simultaneously
Rushing generating mechanism and be respectively used to signal processing and Pulse Width Control, in terms of inspection data, this utility model sensitivity and stability are more
Have technology to compare to have a distinct increment.
This utility model realizes repeatedly Faraday effect circulation accumulation by innovative design, thus effectively reduces the use of sensor fibre
Length, owing to sensor fibre is expensive, high Fidel's constant sensor fibre of particularly extraordinary doping.Therefore, this utility model is permissible
Cost is indirectly reduced on the basis of improving performance.
Accompanying drawing explanation
Fig. 1 is this utility model structural representation；
Fig. 2 is photoswitch break-make schematic diagram；
In figure: low level is 1 → 4,2 → 3；High level is 1 → 3,2 → 4；
Fig. 3 is pulse control signal schematic diagram；
Fig. 4 is deflection angle and cycle-index graph of a relation；
Fig. 5 be this utility model when selecting the 8th subpulse circulation the time domain impulse that obtains with the change of electric current；
Fig. 6 is that sensitivity is with cycle-index graph of a relation.
Detailed description of the invention
As it is shown in figure 1, the present embodiment includes: linear polarization pulsed light generating mechanism, control impulse mechanism, the light of 2 × 2
Switch and sensor fibre, wherein: the first input end of photoswitch and the first outfan respectively with linear polarization pulsed light generating mechanism and
Control impulse mechanism be connected to receive linear polarization pulsed light and control pulse, control impulse mechanism and send out with linear polarization pulsed light
Life structure is connected and exports modulation pulse, and the second input of photoswitch and the second outfan form closed circuit with sensor fibre.
Described linear polarization pulsed light generating mechanism includes: light source, manipulator and the polarizer being sequentially connected, wherein: the polarizer
Output lead polarized pulses light receives from the modulation pulse controlling impulse mechanism to the first input end of photoswitch, manipulator.
Described control impulse mechanism includes: analyzer, photodetector, signal processing unit and the pulse being sequentially connected
Generator, wherein: the voltage signal that photodetector is obtained by signal processing unit is acquired and processes, analytic signal amplitude
Change obtains the pulse polarization variations information caused affected by magnetic fields and exports to pulse generator, and pulse generator is respectively to linear polarization
The output modulation pulse of pulsed light generating mechanism is to produce light pulse, to photoswitch output control pulse to control light pulse at closed circuit
In circulation time.
Described polarization variations information includes: control pulse and synchronizing information.
Described sensor fibre is arranged in closed circuit, and the length of this sensor fibre is more than or equal to the length of modulation pulse.
Described signal processing unit includes: random waveform generation module and data acquisition module.
As shown in Figure 2 to 4, the present embodiment relates to the fiber-optic current sensor method of said apparatus, specifically includes following steps:
Step 1) system assembles:
Laser instrument is connected to manipulator by optical fiber by 1.1, and by optical fiber, manipulator is connected to the polarizer, is passed through by the polarizer
Optical fiber is connected to one input port of photoswitch, builds closed circuit system based on photoswitch；
1.2 for closed circuit system: the first input end of photoswitch and the first outfan respectively with linear polarization pulsed light generation machine
Structure is connected with controlling impulse mechanism, and the second input of photoswitch and the second outfan composition closed circuit, sensor fibre is arranged
In closed circuit；
1.3 use the optical fiber of 1km length to be arranged at closed circuit system, simultaneously as postponing optical fiber and sensor fibre, as prolonging
Slow effect refers to that pulse length is whole and is comprised in closed circuit, thus ensures system stability；
Closed circuit outfan is connected to analyzer by optical fiber by 1.4, by optical fiber, analyzer is connected to photodetector,
Data acquisition module photodetector being connected in signal processing unit by electric connection line.
Step 2) system initialization:
2.1 pairs of laser instrument arrange bias voltage and electric current, and in the present embodiment, Output of laser power is 25mW.To photodetector
Bias voltage and electric current are set so that the optical signal received can be converted to voltage amplitude signal output.
2.2 by the modulation pulse needed for the random waveform generation module generation in command-control signal processing unit and control pulse,
Output modulation electric impulse signal to the continuous laser that laser instrument export by manipulator carries out impulse modulation to produce light pulse, exports control
Pulse to photoswitch to control light pulse circulation time in closed circuit.
The present embodiment have employed the modulating pulse width of 5 microseconds, and the length controlling pulse is chosen according to required cycle-index,
In the case of circulating at 10 times, choosing control pulse length is 55 microseconds.
2.3) optical signal that photodetector obtains is converted into voltage signal and is input to the data acquisition module of signal processing unit,
Fig. 5 shows the collected pulse amplitude time-domain signal after 8 circulations amplitude of variation under different current conditions.
As shown in Figure 6, this utility model innovatively employs laser instrument, manipulator, the polarizer, 2 × 2 photoswitches, analyzing
Device and photodetector build closed circuit, and have employed custom-designed signal processing unit and pulse signal control unit.
Shown in figure, the optical fiber current sensing system finally given has high stability and highly sensitive performance advantage, and sensitivity is with circulation
Number of times promotes, and wherein sensing fiber section can change fiber type as required.
Above-mentioned be embodied as can by those skilled in the art on the premise of without departing substantially from this utility model principle and objective with different
Mode carries out local directed complete set to it, and protection domain of the present utility model is as the criterion with claims and is not limited by above-mentioned being embodied as,
Each implementation in the range of it is all by the constraint of this utility model.
Claims (5)
1. a high sensitivity optical fiber current sensor device based on closed circuit, it is characterised in that including: linear polarization pulsed light
Generating mechanism, control impulse mechanism, the photoswitch of 2 × 2 and sensor fibre, wherein: the first input end of photoswitch and the
One outfan is connected with linear polarization pulsed light generating mechanism and control impulse mechanism respectively, controls impulse mechanism and linear polarization
Pulsed light generating mechanism is connected, and the second input of photoswitch and the second outfan form closed circuit with sensor fibre.
High sensitivity optical fiber current sensor device based on closed circuit the most according to claim 1, is characterized in that, described
Linear polarization pulsed light generating mechanism include: light source, manipulator and the polarizer being sequentially connected.
High sensitivity optical fiber current sensor device based on closed circuit the most according to claim 1, is characterized in that, described
Control impulse mechanism include: analyzer, photodetector, signal processing unit and the pulse generator being sequentially connected.
High sensitivity optical fiber current sensor device based on closed circuit the most according to claim 1, is characterized in that, described
Sensor fibre length more than or equal to modulation pulse length.
5., according to the high sensitivity optical fiber current sensor device based on closed circuit described in claim 1 or 4, it is characterized in that,
Described sensor fibre is particularly as follows: use the optical fiber of 1km length to be arranged at closed circuit system, simultaneously as postponing optical fiber and sensing
Optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620357946.8U CN205539130U (en) | 2016-04-26 | 2016-04-26 | High sensitivity optic fiber current sensing device based on circulation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620357946.8U CN205539130U (en) | 2016-04-26 | 2016-04-26 | High sensitivity optic fiber current sensing device based on circulation circuit |
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| CN205539130U true CN205539130U (en) | 2016-08-31 |
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| CN201620357946.8U Expired - Fee Related CN205539130U (en) | 2016-04-26 | 2016-04-26 | High sensitivity optic fiber current sensing device based on circulation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458553A (en) * | 2020-04-29 | 2020-07-28 | 中国矿业大学 | High-sensitivity all-fiber current measuring device and method with double-circulation structure |
-
2016
- 2016-04-26 CN CN201620357946.8U patent/CN205539130U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458553A (en) * | 2020-04-29 | 2020-07-28 | 中国矿业大学 | High-sensitivity all-fiber current measuring device and method with double-circulation structure |
| CN111458553B (en) * | 2020-04-29 | 2021-03-23 | 中国矿业大学 | High-sensitivity all-fiber current measuring device and method with double-circulation structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20190426 |