CN106568534A - Temperature measuring system and method - Google Patents
Temperature measuring system and method Download PDFInfo
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- CN106568534A CN106568534A CN201510657588.2A CN201510657588A CN106568534A CN 106568534 A CN106568534 A CN 106568534A CN 201510657588 A CN201510657588 A CN 201510657588A CN 106568534 A CN106568534 A CN 106568534A
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- temperature
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- phase angle
- path difference
- optical path
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The invention provides a temperature measuring system, which comprises a light source, an optical fiber assembly, a phase angle delay device, a spectrometer and a temperature calculating device. Source light rays emitted by the light source are transmitted through the optical fiber assembly and then, irradiate on the phase angle delay device; the phase angle delay device converts the source light rays into two beams of coherent light rays, wherein optical path difference between the two beams of coherent light rays is corresponding to environment temperature, where the phase angle delay device locates; the two beams of coherent light rays are transmitted to the spectrometer through the optical fiber assembly; the spectrometer converts the two beams of coherent light rays into discrete spectrum signals and provides the discrete spectrum signals to the temperature calculating device, wherein characteristics of the discrete spectrum signals are corresponding to characteristics of interference rays of the two beams of coherent light rays; and the temperature calculating device is used for carrying out calculation according to the discrete spectrum signals to obtain environment temperature. The temperature measuring system has higher anti-corrosion and anti-interference capability, and is low in cost.
Description
Technical field
The present invention relates to temperature measurement technology, more particularly to a kind of temperature measurement system and method.
Background technology
In modern industry production process, such as coal fired power generation, blast furnace steel-making are required for the scene of carrying out
Temperature survey, to know production status, could improve resource utilization.Due to scene temperature it is very high,
1200 DEG C or so are generally reached, for the site environment of such high temperature, can only be adopted contactless
E measurement technology, at present using it is most be to be surveyed at a distance using high temperature thermoelectric occasionally infrared radiation thermometer
Temperature.The certainty of measurement of above-mentioned pyrometer couple is higher, and price is higher, but resistance to corrosion and anti-interference
Ability is poor, and infrared range-measurement system is easier to be disturbed by the veiling glare in environment, and capacity of resisting disturbance is same
Sample is poor, therefore, design a kind of resistance to corrosion and capacity of resisting disturbance is stronger, and price is relatively low
Metering system is particularly important.
The content of the invention
The present invention provides a kind of temperature measurement system and method, with stronger anticorrosive and capacity of resisting disturbance,
And price is relatively low.
The embodiment of the present invention provides a kind of temperature measurement system, including：Light source, optical fiber component, phase angle prolong
Slow device, spectrogrph and temperature computing device；Wherein,
The source light of the light source transmitting is radiated on phase angle delay device after optical fiber component transmission；Institute
State phase angle delay device and the source light is converted to into two beam coherent rays, between the two beams coherent ray
Optical path difference it is corresponding with the ambient temperature residing for the phase angle delay device；
Two beam coherent rays are transferred to the spectrogrph through the optical fiber component again；The spectrogrph is by two
Beam coherent ray is converted to discrete spectrum signal, and is supplied to temperature computing device, the discrete spectrum letter
Number feature and the two beams coherent ray interference light feature it is corresponding；
The temperature computing device is used to obtain the ambient temperature according to the discrete spectrum signal of change.
Temperature measurement system as above, the phase angle delay device is sapphire crystal.
Temperature measurement system as above, temperature computing device is based on according to the discrete spectrum signal
Calculation obtains the ambient temperature, including：
Temperature computing device obtains optical path difference according to the discrete spectrum signal of change；
Temperature computing device is calculated the ambient temperature according to the optical path difference.
Temperature measurement system as above, the temperature computing device is calculated according to the optical path difference
The ambient temperature, including：
The temperature computing device is according to equation below computing environment temperature：
T=-1.3075G3+134.9647G2- 4752.25G+58039.148,
Wherein, T is ambient temperature, and G is optical path difference.
Temperature measurement system as above, temperature computing device is obtained according to the discrete spectrum signal of change
To optical path difference, including：
The temperature computing device carries out Gaussian window Discrete gap transform to equation below：
Wherein, In(λ) be two beam coherent rays interference light light intensity, γ be interfere light interference bar
The contrast of stricture of vagina, λ is the wavelength of the discrete spectrum signal, and G is optical path difference；
Afterwards, equation below is obtained, and optical path difference G is calculated according to equation below：
Wherein, I (gm) be interference light after conversion light intensity, N is sampling number, x (n) for it is described from
The amplitude of astigmatism spectrum signal, λ is the wavelength of the discrete spectrum signal, gmLong, optical path difference G for conversion chamber
G long equal to conversion chamberm。
Temperature measurement system as above, the optical fiber component includes：Fiber coupler and optical fiber.
Temperature measurement system as above, the light source is white light source.
Temperature measurement system as above, also including the polarizer, the polarizer is used to make the white light
The light that light source sends produces polarized light through after the polarizer, and the polarized light prolongs for being radiated at phase angle
Late on device.
Technical scheme provided in an embodiment of the present invention using phase angle delay device by receiving the light that light source sends
Line, and be converted into two beam coherent rays, the optical path difference between two beam coherent rays and phase angle delay device institute
The ambient temperature at place has certain corresponding relation, and receives coherent ray using spectrogrph, and by phase
Dry light is converted into discrete spectrum signal and again the feature of discrete spectrum signal is carried out by temperature computing device
After analysis and calculating, the ambient temperature residing for phase angle delay device is obtained, realize and adopt phase angle delay
Device carries out contactless temperature-measuring, and the resistance to corrosion of phase angle delay device is stronger.In addition, passing through
Optical fiber component is transmitted to the light of phase angle delay device, also achieves remote temperature measurement, and is not easy
Affected by environment spurious rays, with stronger capacity of resisting disturbance, and price is relatively low.
Description of the drawings
Fig. 1 is the structural representation of temperature measurement system provided in an embodiment of the present invention；
Fig. 2 is light path schematic diagram of the white light provided in an embodiment of the present invention through polarization.
Reference：
1- light sources；21- fiber couplers；22- optical fiber；
3- phase angle delay devices；4- spectrogrphs；5- temperature computing devices；
The polarizers of 61- first；The polarizers of 62- second.
Specific embodiment
Fig. 1 is the structural representation of temperature measurement system provided in an embodiment of the present invention.As shown in figure 1,
The present embodiment provides a kind of temperature measurement system, including：Light source 1, optical fiber component, phase angle delay device 3,
Spectrogrph 4 and temperature computing device 5.
Wherein, the source light of the transmitting of light source 1 is radiated at phase angle delay device 3 after optical fiber component transmission
On.Source light is converted to two beam coherent rays by phase angle delay device 3, between the two beams coherent ray
Optical path difference is corresponding with the ambient temperature residing for phase angle delay device.Two beam coherent rays are again through optical fiber group
Part is transferred to spectrogrph 4, and two beam coherent rays are converted to discrete spectrum signal by spectrogrph 4, and are provided
To the feature of the interference light of temperature computing device 5, the feature of discrete spectrum signal and two beam coherent rays
It is corresponding.Temperature computing device 5 is used to obtain ambient temperature according to discrete spectrum signal of change.
Specifically, light source 1 can adopt white light source, and its spectral region is wider, such as light emitting diode
(Light-emitting diode, abbreviation LED), super-radiance light emitting diode (Super radiation
Light-emitting diode, abbreviation SLD), generic halogen lamp etc..
Using the crystal with birefringence effect, its function is to be converted to source light to phase angle delay device 3
Two beams reflect the refracted light that frequency is identical and spread speed is different with the direction of propagation.Wherein one refraction
Light follows the law of refraction, and the sine of angle of incidence is constant with the ratio of the sine at refraction angle, referred to as ordinary
Light.The sine of the angle of incidence of another refracted light is not constant with the ratio of the sine at refraction angle, i.e., not
Follow the law of refraction, referred to as special ray.Between ordinary ray and special ray can as coherent ray,
Produce coherent effect.Optical path difference between ordinary ray and special ray, namely the light between coherent ray
Path difference is corresponding with the ambient temperature residing for phase angle delay device 3, the optical path difference between coherent ray with
Ambient temperature residing for phase angle delay device 3 is raised and reduced.
Two beam coherent rays are transferred to after spectrogrph 4 again through optical fiber component, and spectrogrph 4 is according to certain
Sample frequency two beam coherent rays are converted to into discrete spectrum signal, the feature of discrete spectrum signal and two
The feature of the interference light of beam coherent ray is corresponding, the parameter such as such as wavelength.Therefore, to discrete spectrum
The feature of signal is analyzed and calculates, it is possible to obtain the optical path difference of coherent ray.
Spectrogrph 4 exports discrete spectrum signal to temperature computing device 5, and temperature computing device 5 is used for root
Environment is obtained according to the feature calculation of discrete spectrum signal and with the corresponding relation for interfering light, ambient temperature
The numerical value of temperature.
The technical scheme that the present embodiment is provided by receiving the light that sends of light source using phase angle delay device,
And be converted into two beam coherent rays, the optical path difference between two beam coherent rays with residing for phase angle delay device
Ambient temperature has certain corresponding relation, and receives coherent ray using spectrogrph, and by coherent light
Line is converted into discrete spectrum signal and again the feature of discrete spectrum signal is analyzed by temperature computing device
After calculating, the ambient temperature residing for phase angle delay device is obtained, realized using phase angle delay device
Contactless temperature-measuring is carried out, and the resistance to corrosion of phase angle delay device is stronger.In addition, passing through optical fiber
Component is transmitted to the light of phase angle delay device, also achieves remote temperature measurement, and is not susceptible to ring
The impact of border spurious rays, with stronger capacity of resisting disturbance, and price is relatively low.
Further, the phase angle delay device 3 in above-mentioned technical proposal is the crystal with birefringence effect,
The crystal of such as metal oxide metal, the present embodiment adopts sapphire crystal, and crystal structure is hexagonal crystal
Lattice structure, its chemical composition is aluminium oxide, and chemical property is more stable, and high temperature resistant and decay resistance are preferable.
In addition, above-mentioned optical fiber component specifically may include fiber coupler 21 and optical fiber 22, wherein, optical fiber
Input and output interface of the bonder 21 as light in optical fiber 22, respectively with light source 1, phase angle delay
Device 3 is connected with spectrogrph 4.
Fig. 2 is light path schematic diagram of the white light provided in an embodiment of the present invention through polarization.As shown in Fig. 2
For above-mentioned light source 1, according to white light source, light source 1 can also be arranged on by first polarizer 61
Light output end so that the light that white light source sends forms polarization through after first polarizer 61
Light, the polarizing light irradiation is on phase angle delay device 3.
Preferably, can to arrange second polarizer 62 between phase angle delay device 3 and spectrogrph 4,
It is identical with the polarization direction of the polarized light after first polarizer 61 respectively through second polarizer 62, use
In filter spectrogrph 4 input light in veiling glare.
On the basis of above-mentioned technical proposal, the present embodiment also provides a kind of realization side of computing environment temperature
Formula, the mode that those skilled in the art can provide according to the present embodiment carries out appropriate parameter adjustment, obtains
Other implementations.
Specifically, temperature computing device 5 obtains ambient temperature according to discrete spectrum signal of change, including such as
Lower two steps：Step one, temperature computing device 5 obtains optical path difference according to discrete spectrum signal of change；
Step 2, temperature computing device 5 is calculated ambient temperature according to optical path difference.
Wherein, step one specifically can be in the following way：
Gaussian window Discrete gap transform is carried out to following light intensity computing formula：
Wherein, In(λ) light intensity of the interference light of the two beam coherent rays exported for phase angle delay device 3, γ
To interfere the contrast of the interference fringe of light, λ is the wavelength of discrete spectrum signal, and G is optical path difference.It is high
This window Discrete gap transform is a kind of with Gauss window filtering, the spectral signal based on Fourier transform principle
Demodulating algorithm.
After Gaussian window Discrete gap transform, equation below is obtained, and calculated according to equation below
To optical path difference G：
Wherein, I (gm) be interference light after conversion light intensity, N is sampling number, and x (n) is discrete light
The amplitude of spectrum signal, λ for discrete spectrum signal wavelength, gmIt is long to convert chamber, when optical path difference G is one
During definite value, optical path difference G is equal to the long g in conversion chamberm, therefore it is calculated the long g in conversion chamberm, also just obtain
Optical path difference G.
Above-mentioned steps two can be realized in the following way：
Temperature computing device 5 is according to equation below computing environment temperature：
T=-1.3075G3+134.9647G2- 4752.25G+58039.148,
Wherein, T is ambient temperature, and G is optical path difference.Calculate according to by optical path difference G that step one is obtained
Obtain ambient temperature T.
Formula in step 2 can be to be obtained, i.e., by the way of demarcating：Using thermometric in prior art
The higher sensor of precision carries out many experiments thermometric to the ambient temperature residing for phase angle delay device 3, enters
And be fitted and obtain the formula, to demarcate to the technical scheme that the present embodiment is provided.
Said temperature computing device 5 can be computer, and its internal algorithm and calculating process can be by technology people
Member writes software program realization, or builds model to realize using certain application software, can adopt skill
Mode known to art personnel is performing.
Finally it should be noted that：Various embodiments above is only illustrating technical scheme rather than right
Its restriction；Although being described in detail to the present invention with reference to foregoing embodiments, this area it is common
Technical staff should be understood：It still can modify to the technical scheme described in foregoing embodiments,
Either equivalent is carried out to which part or all technical characteristic；And these modifications or replacement, and
The scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution is not made.
Claims (8)
1. a kind of temperature measurement system, it is characterised in that include：Light source, optical fiber component, phase angle delay
Device, spectrogrph and temperature computing device；Wherein,
The source light of the light source transmitting is radiated on phase angle delay device after optical fiber component transmission；Institute
State phase angle delay device and the source light is converted to into two beam coherent rays, between the two beams coherent ray
Optical path difference it is corresponding with the ambient temperature residing for the phase angle delay device；
Two beam coherent rays are transferred to the spectrogrph through the optical fiber component again；The spectrogrph is by two
Beam coherent ray is converted to discrete spectrum signal, and is supplied to temperature computing device, the discrete spectrum letter
Number feature and the two beams coherent ray interference light feature it is corresponding；
The temperature computing device is used to obtain the ambient temperature according to the discrete spectrum signal of change.
2. temperature measurement system according to claim 1, it is characterised in that the phase angle delay dress
It is set to sapphire crystal.
3. temperature measurement system according to claim 2, it is characterised in that temperature computing device is used
In obtaining the ambient temperature according to the discrete spectrum signal of change, including：
Temperature computing device obtains optical path difference according to the discrete spectrum signal of change；
Temperature computing device is calculated the ambient temperature according to the optical path difference.
4. temperature measurement system according to claim 3, it is characterised in that the temperature computation dress
Put and the ambient temperature is calculated according to the optical path difference, including：
The temperature computing device is according to equation below computing environment temperature：
T=-1.3075G3+134.9647G2- 4752.25G+58039.148,
Wherein, T is ambient temperature, and G is optical path difference.
5. temperature measurement system according to claim 4, it is characterised in that temperature computing device root
Optical path difference is obtained according to the discrete spectrum signal of change, including：
The temperature computing device carries out Gaussian window Discrete gap transform to equation below：
Wherein, In(λ) be two beam coherent rays interference light light intensity, γ be interfere light interference bar
The contrast of stricture of vagina, λ is the wavelength of the discrete spectrum signal, and G is optical path difference；
Afterwards, equation below is obtained, and optical path difference G is calculated according to equation below：
Wherein, I (gm) be interference light after conversion light intensity, N is sampling number, x (n) for it is described from
The amplitude of astigmatism spectrum signal, λ is the wavelength of the discrete spectrum signal, gmLong, optical path difference G for conversion chamber
G long equal to conversion chamberm。
6. temperature measurement system according to claim 2, it is characterised in that the optical fiber component bag
Include：Fiber coupler and optical fiber.
7. temperature measurement system according to claim 2, it is characterised in that the light source is white light
Light source.
8. temperature measurement system according to claim 7, it is characterised in that also including the polarizer,
The light that the polarizer is used to send the white light source produces polarized light through after the polarizer, institute
Polarized light is stated for being radiated at phase angle delay device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657588.2A CN106568534A (en) | 2015-10-13 | 2015-10-13 | Temperature measuring system and method |
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| CN201510657588.2A CN106568534A (en) | 2015-10-13 | 2015-10-13 | Temperature measuring system and method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158602A (en) * | 2007-11-21 | 2008-04-09 | 北京理工大学 | Optical fibre fourier transformation white light interferometric method |
| CN102288304A (en) * | 2011-07-15 | 2011-12-21 | 北京宏孚瑞达科技有限公司 | White-light interference sapphire high-temperature sensor |
-
2015
- 2015-10-13 CN CN201510657588.2A patent/CN106568534A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158602A (en) * | 2007-11-21 | 2008-04-09 | 北京理工大学 | Optical fibre fourier transformation white light interferometric method |
| CN102288304A (en) * | 2011-07-15 | 2011-12-21 | 北京宏孚瑞达科技有限公司 | White-light interference sapphire high-temperature sensor |
Non-Patent Citations (3)
| Title |
|---|
| 余淼等: "蓝宝石晶体高温传感器的信号解调及标定", 《红外与激光工程》 * |
| 刘珅珅等: "基于蓝宝石晶体和角锥棱镜的白光偏振干涉高温测量系统", 《中国光学学会2010年光学大会论文集》 * |
| 王晓军等: "基于离散腔长变换的蓝宝石晶体高温传感器解调研究与改进", 《中国光学学会2010年光学大会论文集》 * |
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