CN110031125A - A kind of optical fiber temperature humidity sensing system - Google Patents
A kind of optical fiber temperature humidity sensing system Download PDFInfo
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- CN110031125A CN110031125A CN201910168181.1A CN201910168181A CN110031125A CN 110031125 A CN110031125 A CN 110031125A CN 201910168181 A CN201910168181 A CN 201910168181A CN 110031125 A CN110031125 A CN 110031125A
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- optical fiber
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- humidity
- photoswitch
- control mainboard
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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Abstract
The invention discloses a kind of optical fiber temperature humidity sensing systems, including control mainboard, NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER and photodetector are provided in control mainboard, NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER and photodetector are respectively connected to a fiber coupler one end, the fiber coupler other end connects a two-way and selects photoswitch, and two-way selects photoswitch to connect light fibre humidity probe and various surgical grade stainless steels by optical fiber respectively；The present invention organically combines the measurement of FBG temperature and TDLAS moisture measurement, demodulation while realizing temperature and humidity in same control mainboard, the advantage high with temperature measurement accuracy, hygrometric range is big, suitable for complex environment, the temperature and humidity measurement of bad working environments.Meanwhile two kinds of technologies are combined into one, and reduce the volume of sensor-based system, and greatly reduce hardware cost, are conducive to the miniaturization and low cost of product.
Description
Technical field
The present invention relates to a kind of optical fiber temperature humidity sensing systems.
Background technique
Temperature and humidity is two important parameters, and the two is usually used cooperatively, meteorology, environmental monitoring, Chemical Manufacture,
The fields such as process control have key effect.
There are many measurement means of temperature and humidity, and temperature measurement includes mercurial thermometer, thermistor, thermocouple etc., humidity
Measurement includes wet and dry bulb, capacitance-resistance method, condensation method etc..For conventional application, these methods can be competent at, but in certain spies
Different application environment, if coal mine, oil exploitation require passive, essential safety, high-voltage electric power system requires electromagnetism interference, aviation boat
It requires anti-radiation, chemical industry, environmental requirement corrosion-and high-temp-resistant etc., at this point, traditional Temperature Humidity Sensor almost all is lost
Effect, and the Temperature and Humidity technology based on Fibre Optical Sensor can play a significant role.
Currently, fiber grating (FBG) temperature sensor comparative maturity, temperature measurement accuracy height, good environmental adaptability, cloth
If flexibly, but fiber bragg grating temperature sensor, also in the laboratory research stage, moisture measurement precision is low, and measurement range also has
Limit, high humidity and low humidity are also unable to measure；And the light fibre humidity transducer based on tunable diode laser absorption spectrometry technology (TDLAS) has
Whether there is or not cross jammings, the advantages such as moisture measurement range is big, precision is high, are widely applied in fields such as environmental protection, chemical industry,
But TDLAS moisture measurement generally provides temperature reference using thermistor or PT100 platinum resistance for it, both electron temperatures pass
Sensor far then needs to increase transmitter again commonly used in the short distance measurement in 20 meters, distance, and the equipment such as logging, volume is big,
Installation maintenance is inconvenient, and electrical type sensor needs live line work, and in gunpowder, oil depot, the special occasions such as mine are simultaneously uncomfortable
With.Since FBG and two kinds of Principle of fiber optical sensing technique of TDLAS are entirely different, realize that the method divergence of thermometric and hygrometric is excessive, belong to
In two sets of independent measuring systems, the open source information that the two is combined and carries out optical fiber temperature and humidity sensing is had not yet to see.
Summary of the invention
The purpose of the present invention is to propose to a kind of optical fiber temperature humidity sensing systems, by FBG and two kinds of optical fiber sensing technologies of TDLAS
It combines, is switched by photoswitch, using NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER respectively to fiber grating and aqueous vapor
Absorption peak carries out length scanning, obtains corresponding Bragg center wavelength variation and moisture sorption intensity, finally leads in one piece of control
It realizes on plate and is demodulated while temperature and humidity.
To achieve the goals above, the technical scheme is that a kind of optical fiber temperature humidity sensing system, including control are led
Plate, wherein NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER and photodetector, narrow line width regulatable half are provided in control mainboard
Conductor laser and photodetector are respectively connected to a fiber coupler one end, and the fiber coupler other end connects one two
Road selects photoswitch, and two-way selects photoswitch to connect light fibre humidity probe and various surgical grade stainless steels by optical fiber respectively；
When needing to measure humidity, control two-way selection photoswitch passes through the light that NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER issues
Fiber coupler is sent to light fibre humidity probe, then will be coupled into photodetection from the optical signal of light fibre humidity probe reflection
Device；
When needing to measure temperature, control two-way selection photoswitch passes through the light that NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER issues
Fiber coupler is sent to various surgical grade stainless steels, and the optical signal reflected from various surgical grade stainless steels is then coupled into photodetection
Device.
Scheme is further: the light fibre humidity is popped one's head in and various surgical grade stainless steels are the Temperature Humidity Sensors being linked together；
Sensor outer cover of humiture material is 316L Stainless Steel Shell, and long rabbet is provided on shell, there is multistorey strainer mesh outside shell.
Scheme is further: there are two optical fiber flange, light fibre humidity probe and various surgical grade stainless steels are suitable for described shell one end
Sequence connects two-way with two core single mode optical fibers by optical fiber flange and selects photoswitch.
Scheme is further: the light fibre humidity probe is moisture sorption pond, and the various surgical grade stainless steels are fiber gratings
Temperature sensor.
Scheme is further: the control mainboard connection laptop or industrial personal computer, laptop or industrial personal computer are logical
USB RS 232/485 data lines connection control mainboard is crossed, data communication is carried out with control mainboard, sends order or receive warm and humid
Degree evidence.
Compared with the prior art, the present invention organically combines the measurement of FBG temperature and TDLAS moisture measurement, in same control
Demodulation while realizing temperature and humidity on mainboard processed, the advantage high with temperature measurement accuracy, hygrometric range is big are suitable for complexity
The temperature and humidity measurement of environment, bad working environments.Meanwhile two kinds of technologies are combined into one, and reduce the volume of sensor-based system, and greatly
Hardware cost is reduced, the miniaturization and low cost of product are conducive to.
The present invention is described in detail with reference to the accompanying drawings and examples.
Detailed description of the invention
Fig. 1 is inventive structure schematic diagram.
Specific embodiment
A kind of optical fiber temperature humidity sensing system, as shown in Figure 1, being set in control mainboard the system comprises control mainboard 1
It is equipped with NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER 101 and photodetector 102, NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER and photoelectricity
Detector is respectively connected to 3 one end of fiber coupler, and the photoelectrical coupler other end connects a two-way and selects photoswitch 4(1
Select 2 photoswitches), the light fibre humidity that two-way selection photoswitch passes through respectively in two core single mode optical fibers 5 connection Temperature Humidity Sensor 6 is visited
First 601 and various surgical grade stainless steels 602；
When needing to measure humidity, control two-way selection photoswitch passes through the light that NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER issues
Fiber coupler is sent to light fibre humidity probe, then will be coupled into photodetection from the optical signal of light fibre humidity probe reflection
Device；
When needing to measure temperature, control two-way selection photoswitch passes through the light that NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER issues
Fiber coupler is sent to various surgical grade stainless steels, and the optical signal reflected from various surgical grade stainless steels is then coupled into photodetection
Device.
The control mainboard will be sent to host computer 7 after data processing, host computer includes laptop or industrial personal computer.Pen
Remember that this computer or industrial personal computer connect control mainboard by USB RS 232/485 data lines, carry out data communication with control mainboard,
It sends order or receives data of the Temperature and Humidity module.
Wherein: the light fibre humidity is popped one's head in and various surgical grade stainless steels are the Temperature Humidity Sensors being linked together；Temperature and humidity passes
Sensor enclosure material is 316L Stainless Steel Shell, corrosion-resistant, pollution-free, and long rabbet is provided on shell, there is multilayer filter outside shell
Net, dust-proof ventilative, hydrone can be penetrated freely.
There are two optical fiber flange 603, light fibre humidity probe and various surgical grade stainless steels sequences to pass through optical fiber for described shell one end
Flange and two core single mode optical fibers 5 connection two-way select photoswitch 4.
Wherein: the light fibre humidity probe is moisture sorption pond, and the various surgical grade stainless steels are fiber grating temperature sensors
Device；Water vapor absorption pond is the gas absorption cell of industry routine, i.e. optics gas chamber.
In embodiment: control mainboard is the core of sensor-based system, and semiconductor laser can be driven to carry out length scanning, control
1 × 2 photoswitch switching-over light path carries out temperature measurement and moisture measurement, the optical signal for receiving photodetector respectively and carries out AD
It converts and acquires, carry out temperature demodulation using built-in algorithm and humidity demodulates, be finally sent to the data of the Temperature and Humidity module demodulated
Host computer shows, exports.
Fiber coupler is 2 × 1 structures, and there are two optical fiber in one end, are separately connected laser and photodetector, the other end
An only optical fiber connects the input terminal of 1 × 2 photoswitch.The optical coupling entering light switch that fiber coupler issues laser is simultaneously
It is sent to optical fiber temperature moisture probe, the optical signal reflected from optical fiber temperature moisture probe is then coupled into photodetector.
1 × 2 photoswitch has an input terminal and two output ends, can carry out optical path switching, by input terminal and any output
End connection.Photoswitch input terminal connects fiber coupler, and output end connects two core single mode optical fibers.
Two core single mode optical fibers are made of two independent optical fiber, and respectively there are two fibre-optical splice, one end connects photoswitch at both ends
Two output ends, the other end connect optical fiber temperature moisture probe two optical fiber flanges.
Optical fiber temperature moisture probe is the design of full optical passive, and moisture sorption pond is used for the measurement of moisture concentration, that is, realizes wet
Degree detection.Fiber grating temperature sensor can measure the temperature of air near probe.
Using TDLAS technology measure humidity, essence be measure air in vapor content, and aqueous vapor in wavelength less than 2 μ
The near infrared band of m has many absorption peaks, wherein stronger absorption peak be distributed in 1.1 ~ 1.16 μm, 1.34 ~ 1.48 μm and 1.79 ~
1.96 μm of three wave bands, therefore the wavelength of NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER can be selected in above-mentioned wave-length coverage.
Embodiment combines two kinds of optical fiber sensing technologies of FBG and TDLAS, is switched by photoswitch, utilization is narrow
Line width semiconductor laser with tunable carries out length scanning to fiber grating and moisture sorption peak respectively, obtains corresponding Bragg
Center wavelength variation and moisture sorption intensity finally demodulate while realizing temperature and humidity in one piece of control mainboard.This is
It unites and previous independent two unjacketed optical fibers sensor-based system is merged into one, the advantage of the two can not only be played, as temperature measurement accuracy is high, hygrometric
Range is wide, also greatly reduces small product size, reduces hardware cost, paves the way for the miniaturization and low cost of product.
Claims (5)
1. a kind of optical fiber temperature humidity sensing system, including control mainboard, which is characterized in that be provided with narrow linewidth in control mainboard
Semiconductor laser with tunable and photodetector, NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER and photodetector are respectively connected to
One fiber coupler one end, the fiber coupler other end connect a two-way and select photoswitch, and two-way selects photoswitch difference
Light fibre humidity probe and various surgical grade stainless steels are connected by optical fiber；
When needing to measure humidity, control two-way selection photoswitch passes through the light that NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER issues
Fiber coupler is sent to light fibre humidity probe, then will be coupled into photodetection from the optical signal of light fibre humidity probe reflection
Device；
When needing to measure temperature, control two-way selection photoswitch passes through the light that NARROW LINE WAVELENGTH TUNABLE SEMICONDUCTOR LASER issues
Fiber coupler is sent to various surgical grade stainless steels, and the optical signal reflected from various surgical grade stainless steels is then coupled into photodetection
Device.
2. optical fiber temperature humidity sensing system according to claim 1, which is characterized in that the light fibre humidity probe and optical fiber
Temp probe is the Temperature Humidity Sensor being linked together；Sensor outer cover of humiture material is 316L Stainless Steel Shell, on shell
It is provided with long rabbet, there is multistorey strainer mesh outside shell.
3. optical fiber temperature humidity sensing system according to claim 2, which is characterized in that there are two optical fiber for described shell one end
Flange, light fibre humidity probe are connected two-way selection light with two core single mode optical fibers by optical fiber flange with various surgical grade stainless steels sequence and opened
It closes.
4. optical fiber temperature humidity sensing system according to claim 1, which is characterized in that the light fibre humidity probe is aqueous vapor
Absorption cell, the various surgical grade stainless steels are fiber grating temperature sensors.
5. optical fiber temperature humidity sensing system according to claim 1, which is characterized in that the control mainboard connects notebook
Computer or industrial personal computer, laptop or industrial personal computer connect control mainboard by USB RS 232/485 data lines, lead with control
Plate carries out data communication, sends order or receives data of the Temperature and Humidity module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910168181.1A CN110031125A (en) | 2019-03-06 | 2019-03-06 | A kind of optical fiber temperature humidity sensing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910168181.1A CN110031125A (en) | 2019-03-06 | 2019-03-06 | A kind of optical fiber temperature humidity sensing system |
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| CN110031125A true CN110031125A (en) | 2019-07-19 |
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| CN201910168181.1A Pending CN110031125A (en) | 2019-03-06 | 2019-03-06 | A kind of optical fiber temperature humidity sensing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514320A (en) * | 2019-08-19 | 2019-11-29 | 北京航天易联科技发展有限公司 | Composite type optical fibre Temperature Humidity Sensor and its detection system, demodulation method |
| CN114111861A (en) * | 2022-01-25 | 2022-03-01 | 苏州光格科技股份有限公司 | BOTDA system, control method and storage medium |
| CN114324211A (en) * | 2021-12-30 | 2022-04-12 | 北京光感慧智科技有限公司 | Processing method of laser measurement signal and multi-wavelength laser measurement system |
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| CN1865876A (en) * | 2005-11-21 | 2006-11-22 | 天津爱天光电子科技有限公司 | Fiber-optic grating sensor and fiber-optic grating detection device having same |
| US20180356263A1 (en) * | 2015-12-02 | 2018-12-13 | Danmarks Tekniske Universitet | Optical measuring system with an interrogator and a polymer-based single-mode fibre-optic sensor system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110514320A (en) * | 2019-08-19 | 2019-11-29 | 北京航天易联科技发展有限公司 | Composite type optical fibre Temperature Humidity Sensor and its detection system, demodulation method |
| CN114324211A (en) * | 2021-12-30 | 2022-04-12 | 北京光感慧智科技有限公司 | Processing method of laser measurement signal and multi-wavelength laser measurement system |
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Application publication date: 20190719 |