CN208688685U - It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature - Google Patents
It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature Download PDFInfo
- Publication number
- CN208688685U CN208688685U CN201821312689.1U CN201821312689U CN208688685U CN 208688685 U CN208688685 U CN 208688685U CN 201821312689 U CN201821312689 U CN 201821312689U CN 208688685 U CN208688685 U CN 208688685U
- Authority
- CN
- China
- Prior art keywords
- temperature
- light path
- parallel light
- sensing piece
- temperature sensing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses a kind of for detecting the fibre optic temperature sensor of parallel light path temperature, including light source, three port photocirculators, self-focusing lens, reflective temperature sensing piece, photodetector and data processor, reflective temperature sensing piece is placed in parallel light path.Light source generates the light of a special polarization state, the light is imported to 1 port of three port photocirculators, and it exports from its 2 port to self-focusing lens, self-focusing lens introduces light into reflective temperature sensing piece, between two parallel reflectings surface resonance occurs for light, a part of transmitted light enters parallel light path, the temperature information that another part reflected light carries parallel light path returns to 2 ports of three port photocirculators, and it exports from its 3 port to photodetector and becomes electric signal, then send the electric signal to data processor.Optical sensor is directly placed in parallel light path by the utility model, is shared the same light source with parallel light path, is directly detected the temperature of parallel light path.
Description
Technical field
The utility model belongs to fiber optic communication and sensory field of optic fibre, in particular to a kind of for detecting parallel light path temperature
The fibre optic temperature sensor of degree.
Background technique
Parallel light path is common component part in optical fibre device, and effect is to be converted to the emergent light of optical fiber in parallel
Then light is converged in optical fiber again with extending the transmission range of light in space.In this section of parallel light path, it can install additional not
Same optical element is to constitute different optical fibre devices, for example installs electro-optical device additional and be turned into voltage sensor, or install additional
Magnetic-optic devices becomes current sensor, perhaps installs attenuation element additional and is turned into tunable optical attenuator or installs filter element additional
Constitute optical filter ... etc..Therefore, parallel light path is of great significance for the composition of optical fibre device.
However, the optical fibre device constituted in this way, such as voltage sensor, current sensor, adjustable attenuator, optical filter
Deng, since they are bonded together using optical cement, when temperature change, the incidence angle between them can be changed, and
And some optical elements, itself is more sensitive for temperature, and when temperature change, biggish change occurs for performance.These
The temperature stability for the optical fibre device that factor causes parallel light path to be constituted declines.The method for avoiding temperature stability from declining is usual
There are two methods of hardware compensating and software correction.Wherein software correction method, it is necessary to obtain temperature information, that is, need one
Online temperature sensor.
There are two ways to reload temperature sensor, one is in addition individually establishing a set of temperature-sensing system, such as plus
Fiber grating temperature sensor etc. is filled, but in addition installs a set of temperature sensors additional to will cause system extremely complex, such as
Fiber-optic grating sensor needs a set of independent demodulating system；Or it is limited by mounting condition, for example install semiconductor point additional
Temperature meter is not suitable for using in high voltage or strong magnetic field circumstance although circuit is simple.Therefore, although individually installing one additional
Covering independent temperature-sensing system is a feasible scheme, but is not preferred plan.Therefore, it is desirable to the temperature sensor installed additional
A set of light source and partial optical device are shared with parallel light path, entire optical system not only can be simplified, structure is relatively simple
It is single, and can directly measure the temperature inside parallel light path.
Utility model content
In order to solve the technical issues of above-mentioned background technique proposes, the utility model is intended to provide a kind of parallel for detecting
The fibre optic temperature sensor of optical path temperature, fibre optical sensor is directly placed in parallel light path, shares one with parallel light path
Light source directly detects the temperature of parallel light path.
In order to achieve the above technical purposes, the technical solution of the utility model are as follows:
It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature, including light source, three port photocirculators, autohemagglutination
Focus lens, reflective temperature sensing piece, photodetector and data processor；The reflective temperature sensing piece is placed in parallel
In optical path；Light source generates the light of a special polarization state, and the light of the special polarization state is imported three port opticals using optical fiber and is gone in ring
1 port of device, and exporting from 2 ports of three port photocirculators to self-focusing lens, self-focusing lens is by the special polarization state
Light be introduced to reflective temperature sensing piece, reflective temperature sensing piece includes two reflectings surface being parallel to each other, into reflection
Resonance occurs between two parallel reflectings surface for the light of formula temperature sensing piece, and a portion transmitted light enters parallel light path,
The temperature information that another part reflected light carries parallel light path returns to 2 ports of three port photocirculators, and from three ports
3 ports of optical circulator are exported to photodetector, which is converted to electric signal and sent at data by photodetector
Device is managed, the temperature of parallel light path is obtained.
Preferred embodiment based on the above-mentioned technical proposal adds light splitting between self-focusing lens and reflective temperature sensing piece
Prism, the Amici prism will be divided into two bundles from the light of self-focusing lens, a branch of to enter parallel light path, and another beam enters reflection
Formula temperature sensing piece.
Preferred embodiment based on the above-mentioned technical proposal, the reflective temperature sensing piece are greater than 95% light using light transmittance
Thin slice is learned, and the two sides of the otpical leaf is coated with reflectance coating.
Preferred embodiment based on the above-mentioned technical proposal, the thickness of the reflective temperature sensing piece meet claimed below:
Operating point is in the middle part of resonance curve to reflective temperature sensing piece at normal temperature, and guarantees the change with temperature
Change, the phase-shift characterisitc of reflective temperature sensing piece is in the dull linearity range of resonance curve.
Preferred embodiment based on the above-mentioned technical proposal, the material of the reflective temperature sensing piece are quartz glass or high-purity
Glass.
Preferred embodiment based on the above-mentioned technical proposal, three port photocirculator are the belt device of single polarization maintaining optical fibre.
By adopting the above technical scheme bring the utility model has the advantages that
Vane is directly placed among the optical path of parallel light path by the utility model, therefore can be truly reflected parallel
The temperature of optical path.And the method for existing other temperature detections, using a set of independent system, be mounted in parallel light path it
Outer, centre is across encapsulating material, such as packaging cartridge etc., and sensing head can be only installed at the side outside parallel light path, and flat
There is certain temperature difference inside row optical path, there are detection errors.Simultaneously the utility model compared to existing other temperature detections
Method, structure is simpler, and cost is less expensive.The utility model can be not only used among parallel light path, and can apply
In the occasion of other detection temperature.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model,
Appended drawing reference in Fig. 1: 101- light source；Tri- port photocirculator of 102-；103- self-focusing lens；104- is reflective
Temperature sensing piece；105- photodetector；106- data processor；
Fig. 2 is a kind of schematic diagram of improvement structure of the utility model,
Appended drawing reference in Fig. 2: 201- light source；Tri- port photocirculator of 202-；203- self-focusing lens；204- is divided rib
Mirror；The reflective temperature sensing piece of 205-；206- photodetector；207- data processor；
Fig. 3 is the schematic diagram of Fabry Perot interferometer, R1、R2For the reflection coefficient of two parallel reflective faces；
Fig. 4 is temperature-reflection power curve graph, and the dotted line in figure is measured curve, and solid line is theoretical curve.
Specific embodiment
Below with reference to attached drawing, the technical solution of the utility model is described in detail.
Those skilled in the art can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in the utility model fields
Justice.It should also be understood that those terms such as defined in the general dictionary should be understood that with upper with the prior art
The consistent meaning of meaning hereinafter, and unless defined as here, will not with idealization or meaning too formal come
It explains.
Embodiment 1
As shown in Figure 1, a kind of for detecting the fibre optic temperature sensor of parallel light path temperature, including light source 101；Three ports
Optical circulator 102；Self-focusing lens 103；Reflective temperature sensing piece 104；Photodetector 105；Data processor 106.
The utility model realizes that the principle of parallel light path temperature detection is as follows:
Referring to Fig. 3, when a good thin slice of light transmission, two sides plates reflectance coating and (or utilizes the natural phenanthrene in two sides
Nie Er reflection) Fabry Perot (F-P) resonant cavity is constituted, ignore the absorption loss of thin slice, the transmissivity of power and anti-
The rate of penetrating meets following formula:
In formula (1), TF-PAnd RF-PThe transmissivity and reflectivity of F-P resonant cavity respectively, R are the single side reflectivity of thin slice, β
=k0N is phase-shift constant, k0=2 π/λ is the wave number in vacuum, and n is the refractive index of thin slice, and L is the thickness of thin slice.When temperature becomes
When change, n and L are the function of temperature T, i.e. β L=2k0n(T)L(T).It is not difficult to obtain, temperature change leads to the variation of phase beta L
Amount are as follows:
That is the variation of phase shift is proportional to the variation (Δ T) of temperature.This result is updated to formula (1), it is available such as Fig. 4
Shown in curve.When the range of selection dut temperature is in above-mentioned sinusoidal linearity range, so that it may as temperature sensor
It uses.
In embodiment 1, light source 101 is to generate a specific polarization state；Three port photocirculators 102 will be specific inclined
The light of polarization state is introduced into parallel light path by self-focusing lens 103, reaches reflective temperature sensing piece 104；Into reflective
Between two parallel reflective faces of vane resonance occurs for the light of temperature sensing piece 104, and a part of light is transmitted from vane
It goes, continues to use for parallel light path；Another part reflected light carries the temperature information of parallel light path, successively returns to self-focusing
Lens 103 and three port photocirculators 102 are output to photodetector 105 by 3 ports of three port photocirculators 102, so
Data processor 106 is reached afterwards to be handled.
In embodiment 1, if the power of light source is kept constant, the light of photodetector 105 is returned to regard to direct ratio
In the reflectivity of sensitive foils, therefore according to the reflected optical power of the sensitive foils detected, environment is just detected
Temperature.
In embodiment 1, due to the change with temperature, the not only reflectivity R of F-P resonant cavityF-PChange, and transmits
Rate TF-PAlso can change, this, which to enter the optical power in parallel light path, to change.This variation can by software into
Row amendment, but still the blemish in an otherwise perfect thing that seems.In order to overcome this disadvantage, the utility model proposes embodiments 2.
Embodiment 2
As shown in Fig. 2, a kind of for detecting the fibre optic temperature sensor of parallel light path temperature, including light source 201；Three ports
Optical circulator 202；Self-focusing lens 203；Amici prism 204；Reflective temperature sensing piece 205；Photodetector 206；Data
Processor 207.
In example 2, light source 201 is to generate a specific polarization state and be input to three port photocirculators 202
1 port；The light of special polarization state is output to self-focusing lens 203 from 2 ports by three port photocirculators 202；Then it introduces
Into Amici prism 204 and it is divided into 2 tunnels, wherein reaching reflective temperature sensing piece 205 all the way, another way enters parallel light path confession
Other elements use；Into the light of reflective temperature sensing piece 205, occur between two parallel reflective faces of vane humorous
Vibration, a part of light transmit away from vane, and another part reflected light carries the temperature information of parallel light path, successively returns to
Self-focusing lens 203 and three port photocirculators 202 are output to photodetector by 3 ports of three port photocirculators
206, it then reaches data processor 207 and is handled.
Embodiment is only to illustrate the technical idea of the utility model, and protection scope of this utility model cannot be limited by this,
It is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within practical
Within the scope of novel protected.
Claims (6)
1. a kind of for detecting the fibre optic temperature sensor of parallel light path temperature, it is characterised in that: the fibre optic temperature sensor
Including light source, three port photocirculators, self-focusing lens, reflective temperature sensing piece, photodetector and data processor；Institute
Reflective temperature sensing piece is stated to be placed in parallel light path；Light source generates the light of a special polarization state, using optical fiber by the spy
The light for determining polarization state imports 1 port of three port photocirculators, and exports from 2 ports of three port photocirculators saturating to self-focusing
The light of the special polarization state is introduced reflective temperature sensing piece by mirror, self-focusing lens, and reflective temperature sensing piece includes two
Between two parallel reflectings surface resonance occurs for the reflecting surface being parallel to each other, the light into reflective temperature sensing piece, wherein
A part of transmitted light enters parallel light path, and the temperature information that another part reflected light carries parallel light path returns to three port opticals
2 ports of circulator, and exporting from 3 ports of three port photocirculators to photodetector, photodetector is by the optical signal
It is converted to electric signal and sends data processor to, obtain the temperature of parallel light path.
2. according to claim 1 for detecting the fibre optic temperature sensor of parallel light path temperature, it is characterised in that: in autohemagglutination
Amici prism is added between focus lens and reflective temperature sensing piece, which will be divided into from the light of self-focusing lens
Two beams, a branch of to enter parallel light path, another beam enters reflective temperature sensing piece.
3. according to claim 1 for detecting the fibre optic temperature sensor of parallel light path temperature, it is characterised in that: described anti-
The otpical leaf that formula temperature sensing piece is greater than 95% using light transmittance is penetrated, and the two sides of the otpical leaf is coated with reflectance coating.
4. according to claim 1 for detecting the fibre optic temperature sensor of parallel light path temperature, which is characterized in that described anti-
Penetrate formula temperature sensing piece thickness meet it is claimed below:
Operating point is in the middle part of resonance curve to reflective temperature sensing piece at normal temperature, and guarantees the variation with temperature, instead
The phase-shift characterisitc for penetrating formula temperature sensing piece is in the dull linearity range of resonance curve.
5. according to claim 1 for detecting the fibre optic temperature sensor of parallel light path temperature, which is characterized in that described anti-
The material for penetrating formula temperature sensing piece is quartz glass or highly pure glass.
6. according to claim 1 for detecting the fibre optic temperature sensor of parallel light path temperature, it is characterised in that: described three
Port photocirculator is the belt device of single polarization maintaining optical fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821312689.1U CN208688685U (en) | 2018-08-15 | 2018-08-15 | It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821312689.1U CN208688685U (en) | 2018-08-15 | 2018-08-15 | It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208688685U true CN208688685U (en) | 2019-04-02 |
Family
ID=65885109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821312689.1U Expired - Fee Related CN208688685U (en) | 2018-08-15 | 2018-08-15 | It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208688685U (en) |
-
2018
- 2018-08-15 CN CN201821312689.1U patent/CN208688685U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4775214A (en) | Wavelength coded resonant optical sensor | |
| US4627728A (en) | Compensated Fabry Perot sensor | |
| EP0587708B1 (en) | Determination of induced change of polarization state of light | |
| US5963034A (en) | Electro-optic electromagnetic field sensor system with optical bias adjustment | |
| CN104703105B (en) | Double FP chambers optical fiber sound sensing probes and its sensor-based system | |
| US4598996A (en) | Temperature detector | |
| US5841536A (en) | Polarization interferometer apparatus using the polarization dependent phase lag in a birefringent retarder | |
| CN106771549B (en) | A kind of high-precision resonance type optical voltage sensor and detection method | |
| CN104185794A (en) | Optically based voltage sensing device and method | |
| CN105806468A (en) | Fiber bragg grating vibration sensor and detection device thereof | |
| US5982174A (en) | External cavity fiber Fabry-Perot magnetometer | |
| US8730481B2 (en) | Sagnac optical ingredient-measuring apparatus with circular polarizers in parallel | |
| JPS6235222A (en) | Photoelastic type measurement transducer | |
| CN104634369A (en) | Ring laser sensor | |
| CN111443429B (en) | Thin film type optical fiber polarizing device | |
| CN208688685U (en) | It is a kind of for detecting the fibre optic temperature sensor of parallel light path temperature | |
| CN1307404C (en) | Interference type optical fiber gyroscope based on MZ interference principle | |
| CN108254101A (en) | A kind of polarization interference formula passive fiber temperature sensor | |
| JPH0829128A (en) | Physical-quantity measuring apparatus, and measuring instrument thereof | |
| CN106796125B (en) | Interference determination sensor with differential modulated phase-detection | |
| RU2762530C1 (en) | Interferometric fiber-optic gyroscope | |
| US5912457A (en) | Optically-based pressure sensor having temperature compensation | |
| WO2021185301A1 (en) | Wavelength measurement device and wavelength measurement method | |
| CN111337759A (en) | Closed-loop electric field detection system integrated with BGO crystal optical waveguide | |
| JP2000338154A (en) | Reflection type light modulator and electric field measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190402 Termination date: 20200815 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |