CN204964060U - Temperature sensing device based on optic fibre mach -Zehnder that receives a little interferes - Google Patents
Temperature sensing device based on optic fibre mach -Zehnder that receives a little interferes Download PDFInfo
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- CN204964060U CN204964060U CN201520569981.1U CN201520569981U CN204964060U CN 204964060 U CN204964060 U CN 204964060U CN 201520569981 U CN201520569981 U CN 201520569981U CN 204964060 U CN204964060 U CN 204964060U
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Abstract
The utility model provides a temperature sensing device based on optic fibre mach -Zehnder that receives a little interferes, relates to the optical fiber sensing field. It is in order to solve in accurate optical fiber temperature sensing, and the functional type optical fiber temperature transducer sensitivity is not as good as the problem of transmission type optical fiber temperature sensor. The utility model discloses a broadband light source, wire jumper, coupler, sensing arm, reference arm, no. Two couplers, no. Two wire jumpers, spectrum appearance. Wherein, the sensing arm includes single mode fiber, optic fibre and no. Two single mode fiber are received to declining of forming behind the fused biconical taper. Reference arm is ordinary single mode fiber. Coupler of wire jumper another termination of termination light source, sensing arm and reference arm are connected respectively to another termination spectrum appearance of no. Two couplers of no. Two wire jumper terminations in the middle of two couplers. The utility model is suitable for an accurate optical fiber temperature sensing field.
Description
Technical field
The utility model relates to sensory field of optic fibre.Be specifically related to the fibre optic temperature sensor that a kind of Mach-Zehnder interferes.
Background technology
Fibre optic temperature sensor is compared other temperature sensor and is had the advantages such as anti-electromagnetic interference capability is strong, fast response time, applied range.Therefore, fibre optic temperature sensor is just being widely used in the fields such as Aero-Space, building industry, power engineering.Fibre optic temperature sensor is mainly divided into two classes: a class utilizes light transmitting fiber itself have certain sensitive function and make optical fiber have thermometric effect, belongs to functional form temperature sensor; Another kind of is that light transmitting fiber only plays a part to transmit light wave, must install the effect that other sensitive element can realize sensing additional, belong to mode transmission temperature sensor at fiber end face.Compare mode transmission temperature sensor, it is simple that functional form temperature sensor has structure, the advantages such as cost of manufacture is cheap.But its sensitivity is not as good as mode transmission fibre optic temperature sensor.So, be necessary to improve current function type optic-fibre temperature transducer, design novel high sensitivity function type optic-fibre temperature transducer, imperative.
All-fiber Mach-Zehnder interferes temperature sensor to be typical function type optic-fibre temperature transducer.This sensor is served as the effect of pickup arm and reference arm respectively by two single-mode fibers.When carrying out temperature sensing, need pickup arm to be placed in temperature field, reference arm leaves temperature field.The sensitivity of this sensor determined by reference arm to a great extent, therefore, can carry out structural improvement, design new type of high sensitivity Mach-Zehnder temperature sensing device to reference arm.
Summary of the invention
The utility model is that function type optic-fibre temperature transducer, sensitivity is not as good as the problem of mode transmission fibre optic temperature sensor in order to solve when precision temperature sensing.Interfere at all-fiber Mach-Zehnder on the basis of temperature sensor and improve, provide the high sensitivity that a kind of light is interfered based on micro-nano fiber Mach-Zehnder, the temperature sensing device that with low cost, simple to operate, anti-electromagnetic interference capability is strong.
Based on the temperature sensing device that micro-nano fiber Mach-Zehnder interferes, it comprises light source (1), wire jumper (2), coupling mechanism (3), pickup arm (4), reference arm (5), No. two coupling mechanisms (6), No. two wire jumpers (7), spectrometer (8);
Pickup arm (4) removes covering and single-mode fiber after fused biconical taper, and it comprises a single-mode fiber (4-1), micro-nano fiber (4-2), No. two single-mode fibers (4-3);
One termination light source of a wire jumper (2), other termination coupling mechanism (3); Pickup arm (4) one termination coupling mechanism (3), an other termination No. two coupling mechanisms (6); Reference arm (5) one termination coupling mechanism, another termination No. two coupling mechanisms; No. two wire jumper (7) terminations No. two coupling mechanisms (6), another termination spectrometer (8);
The light signal that light source (1) sends arrives a coupling mechanism (3) through a wire jumper (2), in a coupling mechanism (3), light is divided into two bundles, wherein a branch ofly enter pickup arm (4), in pickup arm (4), light signal is respectively through a single-mode fiber (4-1), micro-nano fiber (4-2), No. two single-mode fibers (4-3), a branch ofly in addition enter reference arm (5), two-beam meets in No. two coupling mechanisms (6), then enters in spectrometer (8) through No. two wire jumpers (7).
Centered by described light source (1), wavelength is the broadband light source of 1550nm.
The coupling ratio of a coupling mechanism (3) and No. two coupling mechanisms (6) is 1:1 and the insertion loss of a coupling mechanism (3) and No. two coupling mechanisms (6) is 3dB.
The physical length of pickup arm (4) is than the long 3.1mm of the physical length of reference arm (5) and the length of the middle micro-nano fiber (4-2) of pickup arm (4) is 20cm.
The core diameter of a single-mode fiber (4-1), the core diameter of No. two single-mode fibers (4-3) are identical with the core diameter of reference arm (5); The core diameter that the core diameter ratio of micro-nano fiber (4-2) draws together a single-mode fiber (4-1) and No. two single-mode fibers (4-3) is little 2 μm.
The beneficial effects of the utility model are: the utility model improves on the basis of both arms Mach-Zehnder interference temperature sensor, by removing covering and fused biconical taper to single-mode fiber on pickup arm, forms a kind of micro-nano fiber structure.The core diameter that this micro-nano fiber core diameter compares general single mode fiber is little 2 μm.Directly be exposed to fibre core thinner in temperature field, than the sensor fibre with covering, there is higher sensitivity.Comparing existing all-fiber both arms Mach-Zehnder interferes its sensitivity of temperature sensing device to improve more than 30%, and this temperature sensing device also has the advantages such as cost of manufacture is cheap, anti-electromagnetic interference capability is strong, easy and simple to handle.
Accompanying drawing explanation
Fig. 1 is a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder;
Fig. 2 is the structure for amplifying of pickup arm.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder described in present embodiment, it comprises light source (1), wire jumper (2), coupling mechanism (3), pickup arm (4), reference arm (5), No. two coupling mechanisms (6), No. two wire jumpers (7), spectrometer (8);
Pickup arm (4) removes covering and single-mode fiber after fused biconical taper, and it comprises a single-mode fiber (4-1), micro-nano fiber (4-2), No. two single-mode fibers (4-3);
One termination light source of a wire jumper (2), other termination coupling mechanism (3); Pickup arm (4) one termination coupling mechanism (3), an other termination No. two coupling mechanisms (6); Reference arm (5) one termination coupling mechanism, another termination No. two coupling mechanisms; No. two wire jumper (7) terminations No. two coupling mechanisms (6), another termination spectrometer (8);
When carrying out temperature sensing, first light source and spectrometer are placed correct position, then the micro-nano fiber of pickup arm (4) (4-2) is placed in temperature field, make reference arm leave temperature field.
The light signal that light source (1) sends arrives a coupling mechanism (3) through a wire jumper (2), in a coupling mechanism (3), light is divided into two bundles, wherein a branch ofly enter pickup arm (4), in pickup arm (4), light signal is respectively through a single-mode fiber (4-1), micro-nano fiber (4-2), No. two single-mode fibers (4-3), a branch ofly in addition enter reference arm (5), two-beam meets in No. two coupling mechanisms (6), is coupled, and produces interference.Interference light enters in spectrometer (8) through No. two wire jumpers (7) again, utilizes spectrometer (8) to observe interference spectrum.The drift of interference spectrum and the change of temperature have relation one to one, therefore indirectly can be carried out the measurement of temperature by the drift of observation interference spectrum.
Embodiment two: present embodiment is to a kind of further restriction interfering temperature sensing device based on micro-nano fiber Mach-Zehnder described in embodiment one, and in present embodiment, described light source (1) is broadband light source.
Embodiment three: present embodiment to the further restriction of the broadband light source described in embodiment two, in present embodiment, wavelength 1550nm centered by described broadband light source.
Embodiment four: present embodiment is to a kind of further restriction interfering temperature sensing device based on micro-nano fiber Mach-Zehnder described in embodiment one, in present embodiment, the coupling ratio of a coupling mechanism (3) and No. two coupling mechanisms (6) is 1:1 and the insertion loss of a coupling mechanism (3) and No. two coupling mechanisms (6) is 3dB.
Embodiment five: present embodiment is to a kind of further restriction interfering temperature sensing device based on micro-nano fiber Mach-Zehnder described in embodiment one, in present embodiment, the physical length of pickup arm (4) is than the long 3.1mm of the physical length of reference arm (5) and the length of the middle micro-nano fiber (4-2) of pickup arm (4) is 20cm.
Embodiment six: present embodiment is to a kind of further restriction interfering temperature sensing device based on micro-nano fiber Mach-Zehnder described in embodiment one, and in present embodiment, reference arm (5) is common single-mode fiber.
Embodiment seven: present embodiment is to a kind of further restriction interfering temperature sensing device based on micro-nano fiber Mach-Zehnder described in embodiment one, in present embodiment, the core diameter of a single-mode fiber (4-1), the core diameter of No. two single-mode fibers (4-3) are identical with the core diameter of reference arm (5).
Embodiment eight: present embodiment is to a kind of further restriction interfering temperature sensing device based on micro-nano fiber Mach-Zehnder described in embodiment one, in present embodiment, the core diameter of micro-nano fiber (4-2) is less 2 μm than the core diameter of a single-mode fiber (4-1) and No. two single-mode fibers (4-3).
Principle of work:
Micro-nano fiber Mach-Zehnder interferes temperature sensing:
The course of work: as shown in Figure 1, by a termination light source of a wire jumper (2), other termination coupling mechanism (3); Pickup arm (4) one termination coupling mechanism (3), an other termination No. two coupling mechanisms (6); Reference arm (5) one termination coupling mechanism, another termination No. two coupling mechanisms; No. two wire jumper (7) terminations No. two coupling mechanisms (6), another termination spectrometer (8).
In the process of temperature sensing, need the micro-nano fiber of pickup arm (4) (4-2) to be put in temperature field to be measured.Reference arm (5) leaves temperature field.The light signal sent by light source (1) arrives a coupling mechanism (3) through a wire jumper (2), and the insertion loss of a coupling mechanism (3) is 3dB, and splitting ratio is 1:1.After a coupling mechanism (3), it is that the two-beam of 1:1 enters reference arm (4) and pickup arm (5) respectively that light signal is divided into beam intensity ratio.Light in pickup arm (4) is respectively through a single-mode fiber (4-1), micro-nano fiber (4-2) and No. two single-mode fibers (4-3).The light of transmission in pickup arm (4) and the middle light transmitted of reference arm (5) meet in No. two coupling mechanisms (6).When temperature change in temperature field, the physical length of pickup arm (4) can be made to change on the basis of former pickup arm (4) with reference arm (5) length difference, thus the optical path difference of two-way light is changed.The change of optical path difference can cause the position of two-beam to change mutually.The two-beam met in No. two coupling mechanisms (6) understands the redistribution that light intensity occurs because of the superposition of the mutually different two-beam in position, produces interference.This interference light arrives spectrometer (8) through No. two wire jumpers (7).When interference light because micro-nano fiber (4-2) position occurs when changing mutually in pickup arm (4) by temperature change, the spectrum that spectrometer (8) shows can drift about.The change of temperature can be determined according to the drift of spectrum.
By a part for pickup arm (4) single-mode fiber after removing covering and fused biconical taper, the micro-nano fiber that core diameter is thinner can be formed.In sensing process, the change of temperature can cause the change of sensor fibre length, and removes covering and the change of optical fiber thinner after fused biconical taper to temperature is more responsive, improves the sensitivity of Mach-Zehnder temperature sensing device with this.
Claims (8)
1. based on the temperature sensing device that micro-nano fiber Mach-Zehnder interferes, it is characterized in that: it comprises light source (1), wire jumper (2), coupling mechanism (3), pickup arm (4), reference arm (5), No. two coupling mechanisms (6), No. two wire jumpers (7), spectrometer (8);
Pickup arm (4) removes covering and single-mode fiber after fused biconical taper, and it comprises a single-mode fiber (4-1), micro-nano fiber (4-2), No. two single-mode fibers (4-3);
One termination light source of a wire jumper (2), other termination coupling mechanism (3); Pickup arm (4) one termination coupling mechanism (3), an other termination No. two coupling mechanisms (6); Reference arm (5) one termination coupling mechanism, another termination No. two coupling mechanisms; No. two wire jumper (7) terminations No. two coupling mechanisms (6), another termination spectrometer (8);
The light signal that light source (1) sends arrives a coupling mechanism (3) through a wire jumper (2), in a coupling mechanism (3), light is divided into two bundles, wherein a branch ofly enter pickup arm (4), in pickup arm (4), light signal is respectively through a single-mode fiber (4-1), micro-nano fiber (4-2), No. two single-mode fibers (4-3), a branch ofly in addition enter reference arm (5), two-beam meets in No. two coupling mechanisms (6), then enters in spectrometer (8) through No. two wire jumpers (7).
2. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: centered by light source (1), wavelength is the broadband light source of 1550nm.
3. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: the micro-nano fiber (4-2) of pickup arm (4) is placed in temperature field, and reference arm (5) leaves temperature field.
4. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: the coupling ratio of a coupling mechanism (3) and No. two coupling mechanisms (6) is 1:1 and the insertion loss of a coupling mechanism (3) and No. two coupling mechanisms (6) is 3dB.
5. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: the physical length of pickup arm (4) is than the long 3.1mm of the physical length of reference arm (5) and micro-nano fiber (4-2) length is 20cm.
6. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: reference arm (5) is common single-mode fiber.
7. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: the core diameter of a single-mode fiber (4-1), the core diameter of No. two single-mode fibers (4-3) are identical with the core diameter of reference arm (5).
8. a kind of temperature sensing device of interfering based on micro-nano fiber Mach-Zehnder according to claim 1, is characterized in that: the core diameter of micro-nano fiber (4-2) is less 2 μm than the core diameter of a single-mode fiber (4-1) and No. two single-mode fibers (4-3).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890632A (en) * | 2016-04-06 | 2016-08-24 | 武汉纺织大学 | Optical fiber sensor and manufacturing method thereof |
| CN109520442A (en) * | 2018-11-14 | 2019-03-26 | 荆门博谦信息科技有限公司 | A kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer and optical fiber curvature measuring system |
| CN109635519A (en) * | 2019-01-29 | 2019-04-16 | 中国电子科技集团公司第二十九研究所 | A kind of microwave photon device modeling method coupled based on electromagnetic field and temperature field |
| CN111896035A (en) * | 2020-07-09 | 2020-11-06 | 哈尔滨理工大学 | Mach-Zehnder interference type optical fiber partial discharge detection method based on micro-nano optical fiber coupling |
| CN112666503A (en) * | 2021-01-07 | 2021-04-16 | 南京信息工程大学 | Parallel double-M-Z optical fiber magnetic sensing device and manufacturing method thereof |
| CN112729598A (en) * | 2020-12-07 | 2021-04-30 | 北京信息科技大学 | All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure |
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2015
- 2015-08-03 CN CN201520569981.1U patent/CN204964060U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890632A (en) * | 2016-04-06 | 2016-08-24 | 武汉纺织大学 | Optical fiber sensor and manufacturing method thereof |
| CN109520442A (en) * | 2018-11-14 | 2019-03-26 | 荆门博谦信息科技有限公司 | A kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer and optical fiber curvature measuring system |
| CN109635519A (en) * | 2019-01-29 | 2019-04-16 | 中国电子科技集团公司第二十九研究所 | A kind of microwave photon device modeling method coupled based on electromagnetic field and temperature field |
| CN109635519B (en) * | 2019-01-29 | 2022-06-28 | 中国电子科技集团公司第二十九研究所 | Microwave photonic device modeling method based on electromagnetic field and temperature field coupling |
| CN111896035A (en) * | 2020-07-09 | 2020-11-06 | 哈尔滨理工大学 | Mach-Zehnder interference type optical fiber partial discharge detection method based on micro-nano optical fiber coupling |
| CN112729598A (en) * | 2020-12-07 | 2021-04-30 | 北京信息科技大学 | All-fiber Mach-Zehnder interference structure based on side grinding sensing arm structure |
| CN112666503A (en) * | 2021-01-07 | 2021-04-16 | 南京信息工程大学 | Parallel double-M-Z optical fiber magnetic sensing device and manufacturing method thereof |
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