CN205228778U - Optic fibre electricity length -measuring appliance - Google Patents
Optic fibre electricity length -measuring appliance Download PDFInfo
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- CN205228778U CN205228778U CN201520810674.8U CN201520810674U CN205228778U CN 205228778 U CN205228778 U CN 205228778U CN 201520810674 U CN201520810674 U CN 201520810674U CN 205228778 U CN205228778 U CN 205228778U
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- speed detector
- optical fiber
- high speed
- detector assembly
- electrical length
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses an optic fibre electricity length -measuring appliance, the device includes: laser instrument, 1 fen 2 optical divider, first high -speed detector subassembly, the high -speed detector subassembly of second, faraday's speculum, wherein, the laser instrument with 1 divide 2 optical divider to connect, first high -speed detector subassembly with 1 divide 2 optical divider's first output to connect, 1 the second output that divides 2 optical divider with surveyed after the fiber connection with the high -speed detector subassembly of second is connected, the high -speed detector subassembly of second with faraday's speculum is connected, has appeared optic fibre electricity length -measuring appliance reasonable in design, the higher technological effect of measurement accuracy.
Description
Technical field
The utility model relates to photoelectric technology research field, particularly relates to a kind of optical fiber electrical length measurement mechanism.
Background technology
Optical fiber is fibre-optic writing a Chinese character in simplified form, and is a kind of fiber be made up of glass or plastics, can be used as light conduction instrument.Transmission principle is the total reflection of light.Light transmitting fiber is made up of the glass that two-layer refractive index is different.Internal layer is light inner core, diameter at several microns to tens microns, outer field diameter 0.1 ~ 0.2mm.The refractive index ratio glass outer large 1% of general core glass.According to refraction and the total reflection principle of light, when the angle that light is mapped to inner core and outer bed interface is greater than the critical angle producing total reflection, the impervious interface of light, all reflects.Optical fiber has multiple transmission advantage, as low, lightweight in: bandwidth, loss etc.
In the light signal transmission time in a fiber of accurate measurement different wave length, be commonly called as electrical length.Measuring accuracy is less than 50ps.The product full name of measuring optical fiber electrical length is optical fiber electrical length measurement components, be mainly used in the light signal transmission time in a fiber of measuring different wave length, the optical time domain reflection assembly that the photoelectric communication being different from the communications field uses, domestic at present also do not have Related product to report and similar products sale.
Light signal is to transmit in a fiber close to the light velocity, transmission time (electrical length) can cross level second from nanosecond, measuring accuracy is less than 50ps, be equivalent to actual physics length and be less than 10mm, how accurately to measure the transmission time of certain wavelength channels at one section of optical fiber, light signal must be converted to bandwidth close to 5GHz high-speed pulse signal, by catching or high-speed counting mode high-speed pulse waveform, two high-speed pulses or high precision clock pulse number can be obtained, again the high-speed pulse mistiming is measured or individual counting number numerical monitor, finally provide the electrical length of optical fiber under certain wavelength.
Because optical fiber electrical length measurement components in prior art adopts technical scheme restriction, degree of accuracy is also not high, also has the space of technological improvement, promotes degree of accuracy further.
In sum, present inventor, in the process realizing utility model technical scheme in the embodiment of the present application, finds that above-mentioned technology at least exists following technical matters:
In the prior art, there is the poor technical matters of measuring accuracy in existing optical fiber electrical length measurement components.
Utility model content
The utility model provides a kind of optical fiber electrical length measurement mechanism, solves existing optical fiber electrical length measurement components and there is the poor technical matters of measuring accuracy, achieve optical fiber electrical length measurement mechanism reasonable in design, the technique effect that measuring accuracy is higher.
For solving the problems of the technologies described above, the embodiment of the present application provides optical fiber electrical length measurement mechanism, and described device comprises:
Laser instrument, 1 point of 2 optical branching device, the first high speed detector assembly, the second high speed detector assembly, faraday's catoptron, wherein, described laser instrument is connected with described 1 point of 2 optical branching device, described first high speed detector assembly is connected with the first output terminal of described 1 point of 2 optical branching device, second output terminal of described 1 point of 2 optical branching device is connected with tested optical fiber and is connected with described second high speed detector assembly afterwards, and described second high speed detector assembly is connected with described faraday's catoptron.
Wherein, optical fiber is all adopted to be connected by FC/PC interface between each parts in described device.
Wherein, described device also comprises oscillograph, and described oscillograph is all connected with described first high speed detector assembly and described second high speed detector assembly.
Wherein, a segment standard optical fiber is also provided with between the second output terminal of described 1 point of 2 optical branching device and tested optical fiber.
Wherein, the principle of work of the optical fiber electrical length measurement mechanism in the application is specially:
Carry out the measuring optical fiber transmission time (electrical length) by the method for fiber delay time, laser instrument is divided into light beam 1 and light beam 2 through 1 point of 2 optical branching device, and light beam 1 is detected by the first high speed detector assembly (PD1), exports an electric pulse as reference signal.Light beam 2 is transferred to faraday's catoptron back reflection and returns by the second high speed detector assembly (PD2) detection, and export an electric pulse as second electric pulse, be reflected signal, now the transmission time of light beam 2 is 2 times of times.Two signals export through a passage, are obtaining the Optical Fiber Transmission time (electrical length) by the mistiming of measuring two detectable signal forward positions divided by 2.
Due to light in a fiber transfer rate be exceedingly fast, the time is very short, measure comparatively short fiber time oscillograph cannot differentiate or increase measuring accuracy error, so adopt a segment standard optical fiber, namely increase by one section accurately measure after the Optical Fiber Transmission time, be called system time.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
Owing to have employed, optical fiber electrical length measurement mechanism is designed to comprise: laser instrument, 1 point of 2 optical branching device, first high speed detector assembly, second high speed detector assembly, faraday's catoptron, wherein, described laser instrument is connected with described 1 point of 2 optical branching device, described first high speed detector assembly is connected with the first output terminal of described 1 point of 2 optical branching device, second output terminal of described 1 point of 2 optical branching device is connected with tested optical fiber and is connected with described second high speed detector assembly afterwards, the technical scheme that described second high speed detector assembly is connected with described faraday's catoptron, namely the measuring optical fiber transmission time (electrical length) is carried out by the method for fiber delay time, laser instrument is divided into light beam 1 and light beam 2 through 1 point of 2 optical branching device, light beam 1 is detected by the first high speed detector assembly (PD1), export an electric pulse as reference signal, light beam 2 is transferred to faraday's catoptron back reflection and returns by the second high speed detector assembly (PD2) detection, export an electric pulse as second electric pulse, be reflected signal, now the transmission time of light beam 2 is 2 times of times, two signals export through a passage, the Optical Fiber Transmission time (electrical length) is being obtained divided by 2 by the mistiming of measuring two detectable signal forward positions, so, efficiently solve existing optical fiber electrical length measurement components and there is the poor technical matters of measuring accuracy, and then it is reasonable in design to achieve optical fiber electrical length measurement mechanism, the technique effect that measuring accuracy is higher.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the utility model embodiment, forms a application's part, does not form the restriction to the utility model embodiment;
Fig. 1 is the structural representation of optical fiber electrical length measurement mechanism in the embodiment of the present application one;
Fig. 2 is the embodiment schematic diagram of optical fiber electrical length measurement mechanism in the embodiment of the present application one;
Wherein, 1-laser instrument, 2-1 divides 2 optical branching devices, 3-first high speed detector assembly, 4-tested optical fiber, 5-second high speed detector assembly, 6-faraday catoptron.
Embodiment
The utility model provides a kind of optical fiber electrical length measurement mechanism, solves existing optical fiber electrical length measurement components and there is the poor technical matters of measuring accuracy, achieve optical fiber electrical length measurement mechanism reasonable in design, the technique effect that measuring accuracy is higher.
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but embodiment of the present utility model is not limited thereto.
Please refer to Fig. 1, the optical fiber electrical length measurement mechanism in the application comprises:
Laser instrument 1,1 point of 2 optical branching device 2, first high speed detector assembly 3, second high speed detector assembly 5, faraday's catoptron 6, wherein, described laser instrument is connected with described 1 point of 2 optical branching device, described first high speed detector assembly is connected with the first output terminal of described 1 point of 2 optical branching device, second output terminal of described 1 point of 2 optical branching device is connected with tested optical fiber 4 and is connected with described second high speed detector assembly afterwards, and described second high speed detector assembly is connected with described faraday's catoptron.
Fig. 2, the optical fiber electrical length measurement mechanism specific implementation in the application is:
When tested optical fiber L is 0 meter (not adding tested optical fiber), two signal leading edges difference t1(now read are called system time herein) mistiming (being called the system mistiming itself herein) of same light signal is detected corresponding to two detectors.In figure in 2, A=B=C=D=F=E=50cm, I=G=1m, H=10m, corresponding leading edge time difference is approximately 81.2ns.
First high speed detector assembly and the second high speed detector assembly export as ps level forward position electric pulse, and exported by same electric accessory power outlet, access oscillograph also demonstrates two ps level forward position electric pulses on screen, read the mistiming between two electric pulses, namely obtain the electrical length of testing fiber.
The assemble method of optical fiber electrical length measurement components:
According to Fig. 2, each section of optical fiber is coupled together by FC/PC light flange and shunt, and the first high speed detector assembly and the second high speed detector assembly are connected to electric output port, and optical output port is equally on metal shell.
Wherein, in the embodiment of the present application, high speed detector assembly is measurement mechanism of the prior art, high speed detector assembly is used for detecting light beam, then export electric signal when there being light beam to be detected by high speed detector assembly, as high-speed photodetector, photodetector can be converted to electric signal light signal, different according to the mechanism of device to the different devices function in other words of the mode of radiometric response, photodetector can be divided into two large classes: a class is photon detector; Another kind of is thermal detector, the principle of work of photodetector is based on photoelectric effect, thermal detector absorbs temperature after optical radiation energy based on material and raises, thus changes its electric property, and the maximum feature that it is different from photon detector is the wavelength non-selectivity to optical radiation.
Concrete measuring method is:
Device is connected AC220 power supply, press power switch;
Tested optical fiber one end is received optical output port, faraday's catoptron that another termination is corresponding, electric port is received on oscillograph by coaxial cable;
Oscillograph pattern is changed into single to trigger, load is 50 Ω, presses trigger switch, reads the forward position difference t of two signals on oscillograph;
Can formulae discovery tested optical fiber electrical length be passed through, as follows:
T=1/2（t-81.2ns）（1）
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
Owing to have employed, optical fiber electrical length measurement mechanism is designed to comprise: laser instrument, 1 point of 2 optical branching device, first high speed detector assembly, second high speed detector assembly, faraday's catoptron, wherein, described laser instrument is connected with described 1 point of 2 optical branching device, described first high speed detector assembly is connected with the first output terminal of described 1 point of 2 optical branching device, second output terminal of described 1 point of 2 optical branching device is connected with tested optical fiber and is connected with described second high speed detector assembly afterwards, the technical scheme that described second high speed detector assembly is connected with described faraday's catoptron, namely the measuring optical fiber transmission time (electrical length) is carried out by the method for fiber delay time, laser instrument is divided into light beam 1 and light beam 2 through 1 point of 2 optical branching device, light beam 1 is detected by the first high speed detector assembly (PD1), export an electric pulse as reference signal, light beam 2 is transferred to faraday's catoptron back reflection and returns by the second high speed detector assembly (PD2) detection, export an electric pulse as second electric pulse, be reflected signal, now the transmission time of light beam 2 is 2 times of times, two signals export through a passage, the Optical Fiber Transmission time (electrical length) is being obtained divided by 2 by the mistiming of measuring two detectable signal forward positions, so, efficiently solve existing optical fiber electrical length measurement components and there is the poor technical matters of measuring accuracy, and then it is reasonable in design to achieve optical fiber electrical length measurement mechanism, the technique effect that measuring accuracy is higher.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (4)
1. optical fiber electrical length measurement mechanism, is characterized in that, described device comprises:
Laser instrument, 1 point of 2 optical branching device, the first high speed detector assembly, the second high speed detector assembly, faraday's catoptron, wherein, described laser instrument is connected with described 1 point of 2 optical branching device, described first high speed detector assembly is connected with the first output terminal of described 1 point of 2 optical branching device, second output terminal of described 1 point of 2 optical branching device is connected with tested optical fiber and is connected with described second high speed detector assembly afterwards, and described second high speed detector assembly is connected with described faraday's catoptron.
2. optical fiber electrical length measurement mechanism according to claim 1, is characterized in that, all adopts optical fiber to be connected by FC/PC interface in described device between each parts.
3. optical fiber electrical length measurement mechanism according to claim 1, it is characterized in that, described device also comprises oscillograph, and described oscillograph is all connected with described first high speed detector assembly and described second high speed detector assembly.
4. optical fiber electrical length measurement mechanism according to claim 1, is characterized in that, is also provided with a segment standard optical fiber between the second output terminal of described 1 point of 2 optical branching device and tested optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520810674.8U CN205228778U (en) | 2015-10-20 | 2015-10-20 | Optic fibre electricity length -measuring appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520810674.8U CN205228778U (en) | 2015-10-20 | 2015-10-20 | Optic fibre electricity length -measuring appliance |
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| CN205228778U true CN205228778U (en) | 2016-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226042A (en) * | 2016-07-27 | 2016-12-14 | 中国科学院长春光学精密机械与物理研究所 | The Auto-Test System of space optical remote sensor carbon fiber structural stability and method |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226042A (en) * | 2016-07-27 | 2016-12-14 | 中国科学院长春光学精密机械与物理研究所 | The Auto-Test System of space optical remote sensor carbon fiber structural stability and method |
| CN106226042B (en) * | 2016-07-27 | 2018-06-15 | 中国科学院长春光学精密机械与物理研究所 | The Auto-Test System and method of space optical remote sensor carbon fiber structural stability |
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| 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: 20160511 Termination date: 20201020 |