CN101893489A - Double-wavelength type optical fiber temperature sensor with light compensation structure - Google Patents
Double-wavelength type optical fiber temperature sensor with light compensation structure Download PDFInfo
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- CN101893489A CN101893489A CN2010101224730A CN201010122473A CN101893489A CN 101893489 A CN101893489 A CN 101893489A CN 2010101224730 A CN2010101224730 A CN 2010101224730A CN 201010122473 A CN201010122473 A CN 201010122473A CN 101893489 A CN101893489 A CN 101893489A
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Abstract
The invention discloses a double-wavelength type optical fiber temperature sensor with a light compensation structure. The double-wavelength type optical fiber temperature sensor comprises a double-wavelength light source, an optical fiber probe, an optical fiber coupler, a wavelength division multiplexer and a photoelectricity processor, wherein the double-wavelength light source is used for providing a first light source and a second light source; the optical fiber coupler is connected with the double-wavelength light source and the optical fiber probe and is used for transmitting the first light source and the second light source provided by the double-wavelength light source to the optical fiber probe and outputting reflected light; the wavelength division multiplexer is connected with the optical fiber coupler and is used for dividing the reflected light into the reflected light of the first light source and the reflected light of the second light source and outputting the two paths of the reflected light respectively; and the photoelectricity processor is connected with the wavelength division multiplexer and is used for processing the reflected light of the first light source and the reflected light of the second light source respectively and then dividing the two paths of the reflected light to acquire an ultimately required electric signal and performing data processing according to the signal so as to acquire temperature information. The double-wavelength type optical fiber temperature sensor has the advantages of high stability, high accuracy, simple structure, small volume, light weight, convenient installation and low cost.
Description
Technical field
The present invention relates to the temperature sensor technology field, particularly a kind of double wave elongated optical fiber temperature sensing device that carries the light collocation structure.
Background technology
Fibre optic temperature sensor is the novel sensing technology that begins one's study in recent years, because it can obtain the space distribution state and the time dependent information of dut temperature field, therefore becomes the economy and the effective measurement means that detect in the large scale structure temperature field.It relates to a plurality of subjects such as light, mechanical, electrical, calculation, and technology content is big.
The ultimate principle of fibre optic temperature sensor is: can change the velocity of propagation of light in material in the time of temperature variation, that is to say, refractive index in the time of temperature variation in the light path can change, this time, the light path final position can produce a skew, measured the back and can calculate temperature according to substance characteristics.
Yet in the prior art, fibre optic temperature sensor adopts single wavelength structure more, such as:
The patent No. is 92229667, patent name is the patent of fibre optic temperature sensor, disclose a kind of like this optical fiber temperature sensing device: this device adopts macromolecule temperature sensing material a kind of and that optical fibre refractivity is complementary to be coated in two outside of fiber that are welded together, make luminous energy import this reflecting surface and go out another root optical fiber output by an optical fiber, because this novel temperature sensing material temperature influence, refractive index changes, and therefore the luminous power and the temperature of output are funtcional relationship.
This structure mainly exists poor stability, precision low, is subject to shortcomings such as surrounding environment influence.
Given this, be necessary to provide a kind of double wave elongated optical fiber temperature sensing device that carries the light collocation structure in fact, with stability and the not high defective of accuracy that solves this kind sensor.
Summary of the invention
Technical scheme to be solved of the present invention provides a kind of double wave elongated optical fiber temperature sensing device that carries the light collocation structure, to solve the deficiencies in the prior art.
For solving technique scheme, the invention provides a kind of double wave elongated optical fiber temperature sensing device that carries the light collocation structure, comprising: double-wavelength light source, be used to provide first light source of wavelength between 800-900nm, and wavelength is greater than the secondary light source of 1200nm; Fibre-optical probe, it comprises that reflection coefficient varies with temperature and the semiconductor material that changes; Fiber coupler, the described double-wavelength light source of connection and described fibre-optical probe, first light source and the secondary light source that are used for described double-wavelength light source is provided transfer to described fibre-optical probe, and will be exported by the reflected light that described semiconductor material reflects; Wavelength division multiplexer, connect described fiber coupler, described reflected light is divided into reflected light, and the reflected light two-way of secondary light source of first light source, output respectively; The photoelectricity processor, connect described wavelength division multiplexer, with the reflected light of first light source of input, and the reflected light of secondary light source carry out opto-electronic conversion, amplification, filtering, analog-to-digital processing respectively, obtain first electric signal, and second electric signal after, with above-mentioned both be divided by, obtain the electric signal of ultimate demand, and carry out data processing according to this signal, obtain temperature information.
Preferable, described semiconductor material is a monocrystalline silicon.
Preferable, described monocrystalline silicon constitutes the wafer of single-sided polishing.
Preferable, the output terminal of described double-wavelength light source connects the input end of described fiber coupler, and the COM end of described fiber coupler connects described fibre-optical probe, and the output terminal of described fiber coupler connects the input end of described wavelength division multiplexer.
Preferable, described double-wavelength light source, described fiber coupler, described fibre-optical probe, described wavelength division multiplexer, and described photoelectricity processor between all connect by sensor fibre.
Preferable, the electric signal of described ultimate demand is obtained divided by second electric signal by first electric signal.
Preferable, described photoelectricity processor comprises photo-detector, amplifier, wave filter, analog to digital converter and data processor.
Preferable, the wavelength of described first light source is 850nm, the wavelength of described secondary light source is 1310nm.
Beneficial effect of the present invention is: stability and accuracy height, simple in structure, volume is little, in light weight, be convenient to installation, cost is low.
Description of drawings
Fig. 1 is the structural representation that carries the double wave elongated optical fiber temperature sensing device light path of light collocation structure.
Fig. 2 is the block diagram that carries the double wave elongated fibre optic temperature sensor of light collocation structure.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
See also Fig. 1 and Fig. 2, a kind of double wave elongated optical fiber temperature sensing device that carries the light collocation structure comprises:
Double-wavelength light source 3, be used to provide first light source of wavelength between 800-900nm, and wavelength is greater than the secondary light source of 1200nm;
Fibre-optical probe 5, it comprises that reflection coefficient varies with temperature and the semiconductor material that changes;
The photoelectricity processor, connect described wavelength division multiplexer, with the reflected light of first light source of input, and the reflected light of secondary light source carry out opto-electronic conversion, amplification, filtering, analog-to-digital processing respectively, obtain first electric signal, and second electric signal after, with above-mentioned both be divided by, obtain the electric signal of ultimate demand, and carry out data processing according to this signal, obtain temperature information.
Further, described semiconductor material is a monocrystalline silicon, and described monocrystalline silicon constitutes the wafer of single-sided polishing.
Further, the output terminal of described double-wavelength light source connects the input end of described fiber coupler, and the COM end of described fiber coupler connects described fibre-optical probe, and the output terminal of described fiber coupler connects the input end of described wavelength division multiplexer.
Further, the electric signal of described ultimate demand is obtained divided by second electric signal by first electric signal.
Further, described photoelectricity processor comprises photo-detector, amplifier, wave filter, analog to digital converter and data processor.
Further, the wavelength of described first light source is preferably 850nm, and the wavelength of described secondary light source is preferably 1310nm.
Because the light of the 800-900nm wavelength of first light source is within the absorbing wavelength variation range of monocrystalline silicon, therefore, the light of wavelength is comparatively responsive for the reflectance varies of monocrystalline silicon in this scope, and the sensing device of single wavelength of prior art adopts the interior light of this scope as single light source more.The light of the above wavelength of 1200nm of secondary light source is in outside the monocrystalline silicon absorption spectrum, therefore, reflectance varies for monocrystalline silicon is insensitive, yet, because the light of first light source and secondary light source is reflected by same fibre-optical probe under same temperature, arrive the photoelectricity processor through same path, therefore, the external interference that both are subjected to (going into factors such as the loss of optical fiber stress, optical fiber state, noise) is essentially identical, that is to say, the reflected light of secondary light source is insensitive to reflectivity, but has write down the reference signal with the close noise of first light source.First electric signal and second electric signal are divided by, just can greatly reduce disturbing factor, improve stability greatly.
In sum, the present invention is directed to the stability and the not high defective of accuracy of most in the past optical fiber temperature sensing device designs, a kind of double wave elongated optical fiber temperature sensing device that carries the light collocation structure has been proposed, this sensor construction is by adopting dual wavelength light self compensation structural design, can be under same temperature, obtain the output result of different optical wavelength, again both are compared, set up one with reference to comparison system in the inside of system light path like this, eliminate the interference and the labile factor of temp probe inside,, make system have better stability and accuracy, reach the purpose that improves system performance.In addition, this device also have simple in structure, volume is little, in light weight, be convenient to install, characteristics such as cost is low.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only.Any modification or partial replacement that does not break away from spirit and scope of the invention all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. a double wave elongated optical fiber temperature sensing device that carries the light collocation structure is characterized in that, comprising:
Double-wavelength light source, be used to provide first light source of wavelength between 800-900nm, and wavelength is greater than the secondary light source of 1200nm;
Fibre-optical probe, it comprises that reflection coefficient varies with temperature and the semiconductor material that changes;
Fiber coupler, the described double-wavelength light source of connection and described fibre-optical probe, first light source and the secondary light source that are used for described double-wavelength light source is provided transfer to described fibre-optical probe, and will be exported by the reflected light that described semiconductor material reflects;
Wavelength division multiplexer, connect described fiber coupler, described reflected light is divided into reflected light, and the reflected light two-way of secondary light source of first light source, output respectively;
The photoelectricity processor, connect described wavelength division multiplexer, with the reflected light of first light source of input, and the reflected light of secondary light source carry out opto-electronic conversion, amplification, filtering, analog-to-digital processing respectively, obtain first electric signal, and second electric signal after, with above-mentioned both be divided by, obtain the electric signal of ultimate demand, and carry out data processing according to this signal, obtain temperature information.
2. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 1, it is characterized in that: described semiconductor material is a monocrystalline silicon.
3. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 2 is characterized in that: described monocrystalline silicon constitutes the wafer of single-sided polishing.
4. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 1, it is characterized in that: the output terminal of described double-wavelength light source connects the input end of described fiber coupler, the COM end of described fiber coupler connects described fibre-optical probe, and the output terminal of described fiber coupler connects the input end of described wavelength division multiplexer.
5. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 4 is characterized in that: described double-wavelength light source, described fiber coupler, described fibre-optical probe, described wavelength division multiplexer, and described photoelectricity processor between all connect by sensor fibre.
6. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 1, it is characterized in that: the electric signal of described ultimate demand is obtained divided by second electric signal by first electric signal.
7. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 1, it is characterized in that: described photoelectricity processor comprises photo-detector, amplifier, wave filter, analog to digital converter and data processor.
8. the double wave elongated optical fiber temperature sensing device that carries the light collocation structure as claimed in claim 1, it is characterized in that: the wavelength of described first light source is 850nm, the wavelength of described secondary light source is 1310nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101224730A CN101893489A (en) | 2010-03-11 | 2010-03-11 | Double-wavelength type optical fiber temperature sensor with light compensation structure |
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| CN2010101224730A CN101893489A (en) | 2010-03-11 | 2010-03-11 | Double-wavelength type optical fiber temperature sensor with light compensation structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494799A (en) * | 2011-11-28 | 2012-06-13 | 电子科技大学 | Dual-wavelength optical delay optical fiber temperature sensor |
| CN104374489A (en) * | 2014-10-21 | 2015-02-25 | 深圳供电局有限公司 | Semiconductor point type temperature measurement system |
| CN105044482A (en) * | 2015-04-23 | 2015-11-11 | 南京五石金传感技术有限公司 | Fiber electric-arc optical sensing device having temperature measurement function and measurement method of fiber electric-arc optical sensing device |
| CN109708743A (en) * | 2019-02-20 | 2019-05-03 | 湖北工业大学 | A kind of interference formula fibre optic hydrophone detection system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446280A (en) * | 1993-08-31 | 1995-08-29 | Center For Innovative Technology | Split-spectrum self-referenced fiber optic sensor |
| CN201373781Y (en) * | 2009-03-30 | 2009-12-30 | 山东微感光电子有限公司 | Semiconductor absorption optical fiber temperature detection device |
-
2010
- 2010-03-11 CN CN2010101224730A patent/CN101893489A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446280A (en) * | 1993-08-31 | 1995-08-29 | Center For Innovative Technology | Split-spectrum self-referenced fiber optic sensor |
| CN201373781Y (en) * | 2009-03-30 | 2009-12-30 | 山东微感光电子有限公司 | Semiconductor absorption optical fiber temperature detection device |
Non-Patent Citations (1)
| Title |
|---|
| 刘晔等: "双波长光纤温度传感器的研究", 《西安交通大学学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494799A (en) * | 2011-11-28 | 2012-06-13 | 电子科技大学 | Dual-wavelength optical delay optical fiber temperature sensor |
| CN102494799B (en) * | 2011-11-28 | 2013-06-19 | 电子科技大学 | Dual-wavelength optical delay optical fiber temperature sensor |
| CN104374489A (en) * | 2014-10-21 | 2015-02-25 | 深圳供电局有限公司 | Semiconductor point type temperature measurement system |
| CN105044482A (en) * | 2015-04-23 | 2015-11-11 | 南京五石金传感技术有限公司 | Fiber electric-arc optical sensing device having temperature measurement function and measurement method of fiber electric-arc optical sensing device |
| CN105044482B (en) * | 2015-04-23 | 2018-07-03 | 南京五石金传感技术有限公司 | Optical fiber electric arc optical sensing device and its measuring method with temperature measurement function |
| CN109708743A (en) * | 2019-02-20 | 2019-05-03 | 湖北工业大学 | A kind of interference formula fibre optic hydrophone detection system |
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Application publication date: 20101124 |