CN204142467U - A kind of OFDR experimental system - Google Patents
A kind of OFDR experimental system Download PDFInfo
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- CN204142467U CN204142467U CN201420540833.2U CN201420540833U CN204142467U CN 204142467 U CN204142467 U CN 204142467U CN 201420540833 U CN201420540833 U CN 201420540833U CN 204142467 U CN204142467 U CN 204142467U
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- balanced reciver
- sulfide detector
- polarization
- output terminal
- ead sulfide
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Abstract
The utility model relates to fiber optic sensor technology field, has particularly related to a kind of OFDR experimental system.The utility model discloses a kind of OFDR experimental system, comprise swept laser source, Polarization Controller, electrooptic modulator, interference system, ead sulfide detector, balanced reciver, signal processing system, described swept laser source is connected to the laser input port of electrooptic modulator through Polarization Controller, and the laser output of electrooptic modulator is connected with interference system; Described interference system is connected with the input end of balanced reciver by ead sulfide detector, and the output terminal of balanced reciver is connected with signal processing system.The utility model can Efficient Evaluation damage situations, is conducive to the early warning of accident.
Description
Technical field
The present invention relates to fiber optic sensor technology field, particularly relate to a kind of OFDR experimental system.
Background technology
Along with optical fiber is more and more applied to more field, the detection technique relevant to optical fiber and the range of application of sensing technology are also all the more extensive, as the communication network of the use optical fiber of aircraft and inside, naval vessel, the fault of optical link and optical device can become the key factor jeopardizing its safety, and its fault detect positioning precision required is less than 1mm; Distributing optical fiber sensing can be used for carrying out mm level high-space resolution to the stress distribution of the key members such as bridge, dam, mine, tunnel and measures, can its damage situations of Efficient Evaluation, is beneficial to accident early warning.
Summary of the invention
For the deficiency that prior art exists, object of the present invention just there are provided a kind of OFDR experimental system, can Efficient Evaluation damage situations, is conducive to the early warning of accident.
To achieve these goals, the technical solution used in the present invention is such: a kind of OFDR experimental system, comprise swept laser source, Polarization Controller, electrooptic modulator, interference system, ead sulfide detector, balanced reciver, signal processing system, described swept laser source is connected to the laser input port of electrooptic modulator through Polarization Controller, and the laser output of electrooptic modulator is connected with interference system; Described interference system is connected with the input end of balanced reciver by ead sulfide detector, and the output terminal of balanced reciver is connected with signal processing system; Described interference system is made up of the first polarization-maintaining fiber coupler, testing fiber, the second polarization-maintaining fiber coupler, reference arm and faraday mirror, the A port of described first polarization-maintaining fiber coupler is connected with the laser output of electrooptic modulator, B port is connected with the second polarization-maintaining fiber coupler, C port is connected to testing fiber, D port is connected to faraday mirror, and the D port of the first polarization-maintaining fiber coupler and the connecting portion of faraday mirror form reference arm.
Wherein the effect of Polarization Controller makes the laser entering electrooptic modulator have good polarization characteristic; Faraday mirror plays the effect of catoptron in this system, simultaneously can steady reflection polarisation of light state.
As a kind of preferred version, described electrooptic modulator is two parallel Mach-Zehnder modulators, comprise the first electrical interface a, the second electrical interface b, described first electrical interface a applies direct current (DC) bias, and described second electrical interface b applies the linear frequency sweep RF drive singal of 90 degree of phase differential.
As a kind of preferred version, described ead sulfide detector comprises the first ead sulfide detector, the second ead sulfide detector, and the input end of described first ead sulfide detector, the second ead sulfide detector is all connected with the second polarization-maintaining fiber coupler; Described balanced reciver comprises the first balanced reciver, the second balanced reciver, the input end of described first balanced reciver is connected with the output terminal of the first ead sulfide detector, the second ead sulfide detector respectively, and the input end of the second balanced reciver is connected with the output terminal of the first ead sulfide detector, the second ead sulfide detector respectively; The output terminal of described first balanced reciver, the second balanced reciver is all connected to signal processing system.
As a kind of preferred version, described signal processing system comprises the first bandpass filter, the second bandpass filter and low-pass filter, the input end of described first bandpass filter is connected with the output terminal of the first balanced reciver, the input end of the second bandpass filter is connected with the output terminal of the second balanced reciver, and the output terminal of the first bandpass filter, the second bandpass filter be connected to low-pass filter after connecing superposition.
As a kind of preferred version, described testing fiber is panda type, bow-tie type or ellipse.
Compared with prior art, beneficial effect of the present invention:
1. can control polarization state accurately, obtain stable polarization mode, make optical fiber to external world factor interference impact significantly little, Efficient Evaluation damage situations, is conducive to the early warning of accident;
2. system architecture is simple, and optical device relative low price used, easy to use, cost performance is high, improves stability and the sensitivity of system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
As shown in Figure 1, a kind of OFDR experimental system, comprise swept laser source 1, Polarization Controller 2, electrooptic modulator 3, interference system, ead sulfide detector, balanced reciver, signal processing system, described swept laser source 1 is connected to the laser input port of electrooptic modulator 3 through Polarization Controller 2, and the laser output of electrooptic modulator 3 is connected with interference system; Described interference system is connected with the input end of balanced reciver by ead sulfide detector, and the output terminal of balanced reciver is connected with signal processing system; Described interference system is made up of the first polarization-maintaining fiber coupler 4, testing fiber 5, second polarization-maintaining fiber coupler 6, reference arm 7 and faraday mirror 8, the A port of described first polarization-maintaining fiber coupler 4 is connected with the laser output of electrooptic modulator 3, B port is connected with the second polarization-maintaining fiber coupler 6, C port is connected to testing fiber 5, D port is connected to faraday mirror 8, and the D port of the first polarization-maintaining fiber coupler 4 and the connecting portion of faraday mirror 8 form reference arm 7.
Embodiment 1: described electrooptic modulator 3 is two parallel Mach-Zehnder modulators, comprises the first electrical interface a, the second electrical interface b, described first electrical interface a applies direct current (DC) bias, and described second electrical interface b applies the linear frequency sweep RF drive singal of 90 degree of phase differential; Described ead sulfide detector comprises the first ead sulfide detector 9, second ead sulfide detector 10, and the input end of described first ead sulfide detector 9, second ead sulfide detector 10 is all connected with the second polarization-maintaining fiber coupler 6; Described balanced reciver comprises the first balanced reciver 11, second balanced reciver 12, the input end of described first balanced reciver 11 is connected with the output terminal of the first ead sulfide detector 9, second ead sulfide detector 10 respectively, and the input end of the second balanced reciver 12 is connected with the output terminal of the first ead sulfide detector 9, second ead sulfide detector 10 respectively; The output terminal of described first balanced reciver 11, second balanced reciver 12 is all connected to signal processing system; Described signal processing system comprises the first bandpass filter 13, second bandpass filter 14 and low-pass filter 15, the input end of described first bandpass filter 13 is connected with the output terminal of the first balanced reciver 11, the input end of the second bandpass filter 14 is connected with the output terminal of the second balanced reciver 12, and the output terminal of the first bandpass filter 13, second bandpass filter 14 be connected to low-pass filter 15 after connecing superposition; Described testing fiber 5 is panda type, bow-tie type or ellipse.During concrete enforcement, by applying the linear frequency sweep RF drive singal of 90 degree of phase differential to two parallel Mach-Zehnder modulators, realize optical frequency sweep, swept frequency range is 10GHz, and theoretical space resolution is △ x=c/2nF
s=0.01m=10cm, the laser instrument that swept laser source 1 is selected adopts live width △ v
0the external-cavity semiconductor laser (ECL) of=15KHz, the coherent length in its optical fiber is about 12km.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and non-limiting technical scheme, those of ordinary skill in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (5)
1. an OFDR experimental system, it is characterized in that: comprise swept laser source, Polarization Controller, electrooptic modulator, interference system, ead sulfide detector, balanced reciver, signal processing system, described swept laser source is connected to the laser input port of electrooptic modulator through Polarization Controller, and the laser output of electrooptic modulator is connected with interference system; Described interference system is connected with the input end of balanced reciver by ead sulfide detector, and the output terminal of balanced reciver is connected with signal processing system; Described interference system is made up of the first polarization-maintaining fiber coupler, testing fiber, the second polarization-maintaining fiber coupler, reference arm and faraday mirror, the A port of described first polarization-maintaining fiber coupler is connected with the laser output of electrooptic modulator, B port is connected with the second polarization-maintaining fiber coupler, C port is connected to testing fiber, D port is connected to faraday mirror, and the D port of the first polarization-maintaining fiber coupler and the connecting portion of faraday mirror form reference arm.
2. a kind of OFDR experimental system according to claim 1, it is characterized in that: described electrooptic modulator is two parallel Mach-Zehnder modulators, comprise the first electrical interface a, the second electrical interface b, described first electrical interface a applies direct current (DC) bias, and described second electrical interface b applies the linear frequency sweep RF drive singal of 90 degree of phase differential.
3. according to a kind of OFDR experimental system according to claim 1 or claim 2, it is characterized in that: described ead sulfide detector comprises the first ead sulfide detector, the second ead sulfide detector, the input end of described first ead sulfide detector, the second ead sulfide detector is all connected with the second polarization-maintaining fiber coupler; Described balanced reciver comprises the first balanced reciver, the second balanced reciver, the input end of described first balanced reciver is connected with the output terminal of the first ead sulfide detector, the second ead sulfide detector respectively, and the input end of the second balanced reciver is connected with the output terminal of the first ead sulfide detector, the second ead sulfide detector respectively; The output terminal of described first balanced reciver, the second balanced reciver is all connected to signal processing system.
4. a kind of OFDR experimental system according to claim 3, it is characterized in that: described signal processing system comprises the first bandpass filter, the second bandpass filter and low-pass filter, the input end of described first bandpass filter is connected with the output terminal of the first balanced reciver, the input end of the second bandpass filter is connected with the output terminal of the second balanced reciver, and the output terminal of the first bandpass filter, the second bandpass filter be connected to low-pass filter after connecing superposition.
5. a kind of OFDR experimental system according to claim 1, is characterized in that: described testing fiber is panda type, bow-tie type or ellipse.
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| CN201420540833.2U CN204142467U (en) | 2014-09-20 | 2014-09-20 | A kind of OFDR experimental system |
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| CN201420540833.2U CN204142467U (en) | 2014-09-20 | 2014-09-20 | A kind of OFDR experimental system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296965A (en) * | 2014-09-20 | 2015-01-21 | 江苏骏龙电力科技股份有限公司 | OFDR experiment system |
| CN105846890A (en) * | 2016-03-25 | 2016-08-10 | 江苏骏龙电力科技股份有限公司 | Optical fiber detecting device for kilometer-grade measurement distance |
| CN108845333A (en) * | 2018-06-07 | 2018-11-20 | 天津大学 | A kind of FM-CW laser ranging method inhibiting dither effect |
| CN108873007A (en) * | 2018-06-07 | 2018-11-23 | 天津大学 | A kind of FM-CW laser ranging device inhibiting dither effect |
| CN109031340A (en) * | 2018-07-26 | 2018-12-18 | 天津大学 | A kind of continuous frequency modulation laser radar apparatus measuring speed of moving body |
| CN109031341A (en) * | 2018-07-26 | 2018-12-18 | 天津大学 | A kind of speed of moving body measurement method using continuous frequency modulation laser radar apparatus |
| CN110375779A (en) * | 2019-07-29 | 2019-10-25 | 武汉隽龙科技股份有限公司 | The device and method for improving OFDR frequency domain sample rate |
| CN113639650A (en) * | 2021-08-10 | 2021-11-12 | 安徽大学 | Optical frequency domain reflectometer type sensing demodulation method based on phase accumulation measurement method |
| CN113916269A (en) * | 2021-12-15 | 2022-01-11 | 南京恒高光电研究院有限公司 | Coherent polarization analyzer and measuring method |
-
2014
- 2014-09-20 CN CN201420540833.2U patent/CN204142467U/en active Active
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296965A (en) * | 2014-09-20 | 2015-01-21 | 江苏骏龙电力科技股份有限公司 | OFDR experiment system |
| CN105846890A (en) * | 2016-03-25 | 2016-08-10 | 江苏骏龙电力科技股份有限公司 | Optical fiber detecting device for kilometer-grade measurement distance |
| CN108845333B (en) * | 2018-06-07 | 2022-07-01 | 天津大学 | Frequency modulation continuous wave laser ranging method for inhibiting vibration effect |
| CN108845333A (en) * | 2018-06-07 | 2018-11-20 | 天津大学 | A kind of FM-CW laser ranging method inhibiting dither effect |
| CN108873007A (en) * | 2018-06-07 | 2018-11-23 | 天津大学 | A kind of FM-CW laser ranging device inhibiting dither effect |
| CN108873007B (en) * | 2018-06-07 | 2022-07-01 | 天津大学 | Frequency modulation continuous wave laser ranging device for inhibiting vibration effect |
| CN109031341B (en) * | 2018-07-26 | 2022-07-01 | 天津大学 | Object movement speed measuring method using continuous frequency modulation laser radar device |
| CN109031341A (en) * | 2018-07-26 | 2018-12-18 | 天津大学 | A kind of speed of moving body measurement method using continuous frequency modulation laser radar apparatus |
| CN109031340A (en) * | 2018-07-26 | 2018-12-18 | 天津大学 | A kind of continuous frequency modulation laser radar apparatus measuring speed of moving body |
| CN109031340B (en) * | 2018-07-26 | 2022-07-08 | 天津大学 | Continuous frequency modulation laser radar device for measuring object movement speed |
| CN110375779B (en) * | 2019-07-29 | 2021-06-04 | 武汉昊衡科技有限公司 | Device and method for improving OFDR frequency domain sampling rate |
| CN110375779A (en) * | 2019-07-29 | 2019-10-25 | 武汉隽龙科技股份有限公司 | The device and method for improving OFDR frequency domain sample rate |
| CN113639650A (en) * | 2021-08-10 | 2021-11-12 | 安徽大学 | Optical frequency domain reflectometer type sensing demodulation method based on phase accumulation measurement method |
| CN113639650B (en) * | 2021-08-10 | 2023-12-12 | 安徽大学 | Optical frequency domain reflectometer type sensing demodulation method based on phase accumulation measurement method |
| CN113916269A (en) * | 2021-12-15 | 2022-01-11 | 南京恒高光电研究院有限公司 | Coherent polarization analyzer and measuring method |
| CN113916269B (en) * | 2021-12-15 | 2022-03-04 | 南京恒高光电研究院有限公司 | Coherent polarization analyzer and measuring method |
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Address after: 214500, No. 2, Jianan Road, Jingjiang, Jiangsu, Taizhou Patentee after: Jiangsu Chun long photoelectric Polytron Technologies Inc Address before: 214500, No. 2, Jianan Road, Jingjiang, Jiangsu, Taizhou Patentee before: Jiangsu Junlong Electric Power Technology Co., Ltd. |