CN108287029A - Quasi-distributed underground heat shallow well real-time temperature test sytem and method - Google Patents
Quasi-distributed underground heat shallow well real-time temperature test sytem and method Download PDFInfo
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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
- G01K11/3206—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 at discrete locations in the fibre, e.g. using Bragg scattering
Abstract
The present invention relates to distributed underground heat shallow well temperature to monitor field in real time, provides a kind of monitoring system and method.System includes micro-control subsystem, optical signal launch and transmission subsystem, temperature sensing network, photoelectric signal transformation and processing subsystem；Micro-control subsystem, the transmitting of control scanning optical signal；Optical signal launch and transmission subsystem send out scanning optical signal to temperature sensing network；Photoelectric signal transformation and processing subsystem receive the optical signal of every temperature sensor string return and are transmitted to micro-control subsystem realization temperature monitoring after carrying out opto-electronic conversion.The present invention solves existing monitoring device resistance to corrosion difference and is easy to be unable to the defect that multichannel monitors in real time and precision is low by electromagnetic interference.
Description
Technical field
Field is monitored in real time the present invention relates to underground heat shallow well temperature more particularly to a kind of quasi-distributed underground heat shallow well temperature is real
When monitor system and method.
Background technology
Shallow layer ground-temperature energy refers to containing Rock And Soil, underground in earth's surface following certain depth (being generally less than 200 meters) range
Generally below 25 DEG C of the thermal energy with value of exploiting and utilizing in water and surface water.
Currently, China's shallow layer ground-temperature energy research degree is relatively low, especially all there is bottles for heat exchange efficiency, energy saving etc.
Neck, trace sth. to its source be then can not in deterministic capture underground heat shallow well i.e. slim-hole heat exchanger channels temperature space distribution situation.
The prior art carries out underground heat shallow well by platinum resistance or DS18B20 temperature sensors or in such a way that channel switches
Temperature data acquisition, monitoring device resistance to corrosion is poor and is easy by electromagnetic interference, it cannot be guaranteed that in the presence of a harsh environment
Operation steady in a long-term, and real-time is poor, precision is relatively low.
Invention content
In view of above-mentioned analysis, the present invention is intended to provide a kind of quasi-distributed temperature underground heat shallow well real-time monitoring system and side
Method, to solve the problems, such as that prior art monitoring real-time difference and precision are relatively low.
The purpose of the present invention is mainly achieved through the following technical solutions：
On the one hand, a kind of quasi-distributed underground heat shallow well real-time temperature test sytem, including micro-control subsystem, light are provided
Signal emits and transmission subsystem, temperature sensing network, photoelectric signal transformation and processing subsystem；
Micro-control subsystem, for sending out control signal control scanning optical signal to optical signal launch and transmission subsystem
Transmitting；
Optical signal launch and transmission subsystem send out scanning optical signal to temperature sensing network；
Temperature sensing network includes N temperature sensor string；N≥1；Every temperature sensor string includes an at least optical fiber
Bragg grating temperature sensor；
Photoelectric signal transformation, which receives the optical signal of every temperature sensor string return with processing subsystem and carries out photoelectricity, to be turned
It is transmitted to micro-control subsystem after changing and realizes temperature monitoring.
The present invention has the beneficial effect that：Optical fiber Bragg grating temperature sensor measuring temperature is selected to replace traditional platinum electricity
Resistance or DS18B20 temperature sensors avoid original sensor and are easy by electromagnetic interference because optical fiber transmission is lightwave signal
Defect, and optical fiber is not perishable, can effectively ensure operation steady in a long-term in the presence of a harsh environment.Underground heat shallow well water temperature changes
Moment, and its range of temperature is small, required precision is high, and using multichannel, scanning probe switches the present invention instead of channel simultaneously
Monitoring mode, real-time is good, precision is high.
Further, the optical signal launch and transmission subsystem include scanning light source, fiber coupler and N number of three port optical
Circulator；
Scanning light source sends out single channel continuous spectrum under microcontroller subsystem controls；
The single channel continuous spectrum is divided into the roads N optical signal by fiber coupler；
Enter a temperature sensor string via the port 1 of three port photocirculators and port 2 per road optical signal；
Port 2 and port 3 of the optical signal that temperature sensor string returns through optical circulator enter photoelectric signal transformation and place
Manage subsystem.
Advantageous effect using above-mentioned further scheme is：The information energy such as scanning light source its scanning range, stepping optical wavelength
Enough settings, can meet the needs of multi-channel testing.It is divided into multiple channels by fiber coupler so that sensor can be simultaneously
Multichannel scans, and each channel light energy can realize and respectively or as required customize that solving the prior art does not have autgmentability
Defect.The separation between each signal is well ensured using three ports light rings.
Further, the photoelectric signal transformation and processing subsystem include N number of photodetector, Weak Signal Processing mould
Block, AD conversion module and data acquisition module；
N number of photodetector separately detects the optical signal of N temperature sensor string return and converts optical signal into simulation
Electric signal；
Weak Signal Processing module carries out shaping and amplification to N number of electric signal；
Analog electrical signal is converted to digital electric signal by AD conversion module；
The N number of digital electric signal of data collecting module collected and by the signal transmission of acquisition to micro-control subsystem.
Further, the micro-control subsystem includes microprocessor module, data memory module；
The microprocessor module sends out control signal to optical signal launch and transmission subsystem control and scans optical signal
Transmitting, the control signal includes scanning wavelength range, stepping wavelength and the precision information for scanning optical signal；Meanwhile microprocessor
Device module receives photoelectric signal transformation and the electric signal of processing subsystem obtains return light wavelength information, and temperature change is calculated
Amount.
Further, the monitoring system further includes that electric energy supplies subsystem, the micro-control subsystem further includes that voltage turns
It changes and control module；
The monitoring system further includes that electric energy supplies subsystem, the micro-control subsystem further includes voltage conversion and control
Module；
The electric energy supply subsystem is powered using solar panel；The voltage conversion supplies electric energy with control module
Each electricity consumption module that is converted into that the electric energy that subsystem is supplied carries out different step voltages is answered to be powered, while in microprocessor module
Control under complete each electricity consumption module for power-off control.
Advantageous effect using above-mentioned further scheme is：Meets during field monitoring in practice the needs of to power supply.
On the other hand, a kind of quasi-distributed underground heat shallow well temperature method of real-time is provided, is included the following steps：
Lay temperature sensing network；Temperature sensing network includes N temperature sensor string；N≥1；Every temperature sensor
String includes an at least optical fiber Bragg grating temperature sensor；
The roads N optical signal is sent out to every temperature sensor string；
The optical signal prosessing for receiving the return of every temperature sensor string obtains light wave long message；
The initial wavelength of the optical wavelength each sensor corresponding on the sensor string is compared, temperature is obtained
Information.
Further, sending out the roads N optical signal to every temperature sensor string includes：
It controls scanning light source and emits continuous spectrum；
Continuous spectrum is divided into the roads N optical signal via fiber coupler；
Enter a temperature sensor string via the port 1 of three port photocirculators and port 2 per road optical signal.
Further, it receives the optical signal prosessing that every temperature sensor string returns and obtains optical wavelength, including：
Port 2 and port 3 of the optical signal that temperature sensor string returns through optical circulator enter photoelectric signal transformation and place
Reason subsystem obtains light wave long message through photodetection, analog-to-digital conversion and acquisition process.
Further, laying temperature sensing network includes：
Casing is laid in underground heat shallow well；
By every temperature sensor string bondage on lower rope for drawing water from a well of the end with weight, and goes into the well and be laid in described sleeve pipe
In.
Further, further include that temperature information is locally stored and/or is transmitted to control centre.
Since monitoring method of the present invention and monitoring system are based on identical principle, therefore it can realize effect identical with system
Fruit.
Other features and advantages of the present invention will illustrate in the following description, also, from specification the advantages of part
In become apparent, or understand through the implementation of the invention.The purpose of the present invention and other advantages can be by being write
Specifically noted structure is realized and is obtained in specification, claims and attached drawing.
Description of the drawings
Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in entire attached drawing
In, identical reference mark indicates identical component.
Fig. 1 is that the embodiment of the present invention monitors system structure diagram；
Fig. 2 is that the embodiment of the present invention monitors system scheme of installation.
Wherein, 1- micro-controls subsystem；2- optical signal launch and transmission subsystem；3- photoelectric signal transformations and processing subsystem
System；4- temperature sensing networks；5- electric energy supplies subsystem；6- monitors holder；7- monitoring cases；8- antennas；9- steel wire ropes；10-
Hot shallow well；11- casings；12- steel cards；13- weights；11- microprocessor modules；12- data memory modules；13- voltages convert with
Control module；14- data transmission modules；21 scanning light sources；22 fiber couplers；Tri- ports light rings of 23-；31- photoelectricity is visited
Survey device；32- Weak Signal Processing modules；33-AD conversion modules；34 data acquisition modules；41- optical cables；42- optical fiber Bragg light
Grid temperature sensor；52- solar panels；51- solar charging/discharging control circuits；53- rechargeable lithium battery groups.
Specific implementation mode
Specifically describing the preferred embodiment of the present invention below in conjunction with the accompanying drawings, wherein attached drawing constitutes the application part, and
It is used to illustrate the principle of the present invention together with embodiments of the present invention.
The present invention can realize underground heat shallow well especially shallow layer ground-temperature energy drilling quasi-distributed temperature monitoring, have temperature
It senses sensitive, sensing station flexible arrangement, electromagnetism interference and is not disliked relatively by complex geometry space (such as small-bore wellbore)
The features such as bad environmental restrictions.
As shown in Figure 1, present embodiments providing a kind of quasi-distributed underground heat shallow well real-time temperature test sytem, including micro-control
Subsystem 1, optical signal launch and transmission subsystem 2, temperature sensing network 4, photosignal conversion and processing subsystem 3, electricity
Subsystem 5 can be supplied.
Micro-control subsystem 1, for sending out control signal control scanning optical signal to optical signal launch and transmission subsystem
Transmitting.Optical signal launch and transmission subsystem 2 send out scanning optical signal to temperature sensing network.Temperature sensing network 4 includes
N temperature sensor string；N≥1；Every temperature sensor string includes an at least optical fiber Bragg grating temperature sensor 42,
It is connected by communications optical cable 41.Photoelectric signal transformation receives the optical signal of every temperature sensor string return with processing subsystem 3
And it is transmitted to micro-control subsystem realization temperature monitoring after carrying out opto-electronic conversion.
It should be noted that the variation of underground heat shallow well water temperature is moment, consider that its monitoring accuracy demand, the present embodiment use
Multichannel while scanning probe, real-time is good, precision is high.
Micro-control subsystem 1 include microprocessor module 11, data memory module 12, voltage conversion with control module 13 and
Data transmission module 14；Microprocessor module sends out the transmitting of control signal control scanning optical signal, and control signal includes scanning
Scanning wavelength range, stepping wavelength and the precision information of optical signal；Meanwhile microprocessor module receives photoelectric signal transformation and place
The electric signal of reason subsystem obtains return light wavelength information, and temperature variation is calculated.Data memory module is for local real
When monitoring data storage.Voltage, which is converted, to be supplied subsystem with control module and electric energy and is connected, be used for by electric energy staged conversion with
Suitable for the demand of different electricity consumption modules, while may be implemented to control for power-off.Data transmission module is for passing monitoring data
Transport to control centre.Preferably, data transmission module uses wireless transmission protocol, to adapt to field detection demand.
Optical signal launch includes scanning light source 21, fiber coupler 22 and N number of three ports light rings with transmission subsystem 2
23；Scanning light source sends out single channel continuous spectrum under microcontroller subsystem controls；Fiber coupler is continuous by the single channel
Spectrum is divided into the roads N optical signal；Enter a temperature via the port 1 of three port photocirculators and port 2 per road optical signal
Sensor string；Port 2 and port 3 of the optical signal that temperature sensor string returns through optical circulator enter photoelectric signal transformation and place
Manage subsystem.
It is considered that need multichannel while scanning, the scan-type light source for selecting scanning range and stepping wavelength that can set, simultaneously
Light energy is divided into multiple channels in conjunction with fiber coupler, each channel light energy, which can be realized, respectively or as required to be customized, with
Solve the defect that prior art single channel monitors not autgmentability.It can be realized to incident light and anti-using three ports light rings
The separation for penetrating light well ensures the separation between each signal, avoids the problem that blurring occurs.
Optionally, scanning light source emits single channel C-band (1527-1568nm) continuous spectrum, into fiber coupler electricity
Road is divided into multipath light signal while scanning.It is scanned while can theoretically realizing 2n (n=0,1,2,3 ...) road optical signal,
But since every single order coupler all has loss, in order to ensure the validity of optical signal detection and transmission, the preferably value of n
Less than or equal to 4.
Temperature sensing network 4 includes N temperature sensor string；N≥1；Every temperature sensor string includes an at least light
Fine Bragg grating temperature sensor 42, sensor are connected by optical cable 41, are reacted and are sensed by grating sensor wavelength change
Device ambient temperature situation.
Photoelectric signal transformation turns with processing subsystem 3 including N number of photodetector 31, Weak Signal Processing module 32, AD
Change the mold block 33 and data acquisition module 34；N number of photodetector separately detects the optical signal of N temperature sensor string return and will
Optical signal is converted into analog electrical signal；Weak Signal Processing module carries out shaping and amplification to N number of electric signal；AD conversion mould
Analog electrical signal is converted to digital electric signal by block；The N number of digital electric signal of data collecting module collected simultaneously passes the signal of acquisition
Transport to micro-control subsystem.
The microprocessor module of micro-control subsystem is handled to obtain each sensing on the sensor string to acquisition signal
Wavelength information corresponding to device compares the wavelength information and respective sensor initial wavelength, obtains temperature variation, root
Entire ambient temperature situations are can be obtained according to initial temperature.
It should be noted that obtaining wavelength information to signal processing, using multiple means, (such as spectral unmixing technology detaches
To the multiple wavelength carried in entire signal) it can be achieved, the present invention does not limit it.
It includes solar panel 52, solar charging/discharging control circuit 51 that electric energy, which supplies subsystem 5,.Pass through solar-electricity
Pond plate completes conversion of the solar energy to electric energy, and is connected to the voltage in microprocessor subsystem by solar charging discharging controller
The electric energy that conversion provides entire monitoring system with control module is supplied.In order to be suitable for field night demand, while setting can fill
Solar energy is stored into rechargeable lithium battery group by electric lithium battery group 53, is used when solar energy directly can not provide electric energy.
As shown in Fig. 2, when it is implemented, for monitoring for protection system safety, by micro-control subsystem, optical signal launch with
Transmission subsystem, photoelectric signal transformation and processing subsystem are integrated in monitoring case 7 and on monitoring holder 6, protect
Circuit module is exempted from affected by environment.Simultaneously, it is contemplated that solar panel is inclined at monitoring branch by solar energy conversion efficiency
The top of frame.Field thunder and lightning happens occasionally, and to avoid system by effects of lightning, also sets up lightning protection, lightning protection includes keeping away
Thunder needle 54 and earth conductor 55, the height of lightning rod is higher than the height for monitoring holder.The antenna of setting transmitting signal in monitoring case
8, realize wireless transmission demand.
According to shallow layer ground-temperature energy Exploitation and utilization model, different drilling kinds and the method for utilizing can be respectively in connection with the present invention
The monitoring system of embodiment carries out monitoring.
Specifically, background value monitoring holes are generally single hole single channel, and channel diameter about 100mm can be by using of the invention real
The multichannel for applying example carries out quasi-distributed hierarchical monitor；The general single-hole multi-channel in heat transfer experiments hole is reconnoitred, channel is used in underground
Connection, forms binary channels U-tube, and single channel diameter about 32mm is monitored respectively in combination with multichannel；It is generally double to develop and use hole
Hole (exploitation hole and water injection hole) single channel or multichannel, single channel diameter are about 32mm, using multichannel respectively to exploiting hole
It is monitored respectively with water injection hole.
In conclusion an embodiment of the present invention provides a kind of quasi-distributed underground heat shallow well real-time temperature test sytem, have
Channel scalability is strong, high certainty of measurement, electromagnetism interference and the features such as do not limited by adverse circumstances such as complex geometry spaces,
The transmission of temperature signal can be realized by the connection of single common communication optical cable per channel, while with the temperature in borehole test space
The procurement cost of the increase of resolution ratio, unit information substantially reduces, and the longer-term networkization of shallow well high precision temp degrees of data is surveyed
Amount provides a kind of effective monitoring technology.
The present embodiment additionally provides a kind of quasi-distributed underground heat shallow well temperature carried out using above system the side of monitoring in real time
Method includes the following steps：
Step S1, temperature sensing network is laid；Temperature sensing network includes N temperature sensor string；N≥1；Every temperature
Sensor string includes an at least optical fiber Bragg grating temperature sensor；
Step S2, the roads N optical signal is sent out to every temperature sensor string；
Step S3, it receives the optical signal prosessing that every temperature sensor string returns and obtains light wave long message；
Step S4, the initial wavelength of the light wave long message each sensor corresponding on the sensor string is carried out pair
Than obtaining temperature information.
Step S1 includes：
Casing 11 is laid in underground heat shallow well 10；Every temperature sensor string bondage is carried into the lower rope for drawing water from a well of weight in end
Go into the well being laid in described sleeve pipe.
Specifically,
After shallow earth shallow bore hole pore-forming, lower casing, casing can be zinc-plated casing or PE type U-tubes, by above returning rock
Bits, magma carry out grouting and pour or according to detection requirement using bentonite, the mixture of cement, sand and water, also can be according to original position
Earthen backfill is to increase heat exchange accuracy backfill, it is ensured that casing and borehole wall complete coupling gapless.
The sensor string of temperature sensing network and steel wire rope 9 of going into the well are gone into the well by the binding of steel card 12 by portable winch,
Steel wire rope tail end fixes weight 13, ensures that steel wire rope keeps vertical and goes into the well, each sensor is separately fixed on steel wire rope, is utilized
Steel wire rope undertakes main vertical pulling force, to avoid temperature sensor because its own gravity causes measurement error and damage.
The position for recording the channel and decentralization of sensor string, by steel wire rope by bundled fixed at the wellhead casing pipe of ground,
Steel wire rope is set to be relatively fixed with casing, in order to avoid casing settlement influence monitoring data.
Step S2 includes：It controls scanning light source and emits continuous spectrum；Continuous spectrum is divided into the roads N light letter via fiber coupler
Number；Enter a temperature sensor string via the port 1 of three port photocirculators and port 2 per road optical signal.
Specifically,
Microcontroller by scanning light source send out control signal (including：Sweep spacing and wave-length coverage etc.), laser letter
Number it is divided into multichannel optical signal into fiber coupler group, each channel optical signal passes through the optical circulator of three ports respectively
It enters in fixed sensor string.
Step S3 includes：Port 2 and port 3 of the optical signal that temperature sensor string returns through optical circulator enter optical telecommunications
Number conversion with processing subsystem obtain optical wavelength through photodetection, analog-to-digital conversion and acquisition process.
The reflected light signal of carrying temperature information enters photoelectric sensor assembly by optical circulator and is converted to faint telecommunications
Number, after shaping, amplification, analog signal are converted into digital signal entering acquisition module data acquires, and by final data
It is preserved to data memory module after being handled by microprocessor module.
The principle of step S4 is：The pre-embossed grid meeting reflected laser signals of temperature sensor, change by ambient temperature
Afterwards, pre-embossed raster grid can follow variation, the form of expression for the wavelength departure sensor original state reflected middle cardiac wave
Long, offset is controlled by sensor itself coefficient and environment temperature, and sensor itself coefficient is constant, tests indoor measurement, because
This optical grating reflection wavelength shift (wavelength difference of test wavelength and centre wavelength) and variation of ambient temperature amount (test environment and mark
Determine the temperature difference of environment) direct proportionality.
Further include that temperature information is locally stored and/or is transmitted to control centre by step S5.
Specifically, data are stored or control centre is sent data to by data transmission antenna, data can be achieved and retain
For subsequently using.
Since monitoring method of the present invention and monitoring system are based on identical principle, therefore it can realize effect identical with system
Fruit.Extraly, the means such as installation of going into the well when specific monitoring is implemented are additionally provided and maintain monitoring well in conjunction with the means
The progress of method ensure that the safety and high-precision requirement of monitoring.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of quasi-distributed underground heat shallow well real-time temperature test sytem, it is characterised in that：Including micro-control subsystem, optical signal
Transmitting and transmission subsystem, temperature sensing network, photoelectric signal transformation and processing subsystem；
Micro-control subsystem, the hair for sending out control signal control scanning optical signal to optical signal launch and transmission subsystem
It penetrates；
Optical signal launch and transmission subsystem send out scanning optical signal to temperature sensing network；
Temperature sensing network includes N temperature sensor string；N≥1；Every temperature sensor string includes an at least optical fiber Bradley
Lattice grating temperature sensor；
After photoelectric signal transformation and processing subsystem receive the optical signal of every temperature sensor string return and carry out opto-electronic conversion
It is transmitted to micro-control subsystem and realizes temperature monitoring.
2. monitoring system according to claim 1, it is characterised in that：The optical signal launch includes sweeping with transmission subsystem
Retouch light source, fiber coupler and N number of three ports light rings；
Scanning light source sends out single channel continuous spectrum under microcontroller subsystem controls；
The single channel continuous spectrum is divided into the roads N optical signal by fiber coupler；
Enter a temperature sensor string via the port 1 of three port photocirculators and port 2 per road optical signal；
Port 2 and port 3 of the optical signal that temperature sensor string returns through optical circulator enter photoelectric signal transformation and processing
System.
3. monitoring system according to claim 1, it is characterised in that：The photoelectric signal transformation includes with processing subsystem
N number of photodetector, Weak Signal Processing module, AD conversion module and data acquisition module；
N number of photodetector separately detects the optical signal of N temperature sensor string return and converts optical signal into analog telecommunications
Number；
Weak Signal Processing module carries out shaping and amplification to N number of electric signal；
Analog electrical signal is converted to digital electric signal by AD conversion module；
The N number of digital electric signal of data collecting module collected and by the signal transmission of acquisition to micro-control subsystem.
4. the monitoring system according to one of claim 1-3, it is characterised in that：The micro-control subsystem includes microprocessor
Device module, data memory module；
The microprocessor module sends out transmitting of the control signal to optical signal launch and transmission subsystem control scanning optical signal,
The control signal includes scanning wavelength range, stepping wavelength and the precision information for scanning optical signal；Meanwhile microprocessor module
The electric signal for receiving photoelectric signal transformation and processing subsystem obtains the wavelength information of return light carrying, and each sensing is calculated
The temperature variation that device monitors.
5. monitoring system according to claim 4, it is characterised in that：The monitoring system further includes electric energy supply subsystem
System, the micro-control subsystem further include voltage conversion and control module；
The electric energy supply subsystem is powered using solar panel；The voltage conversion supplies electric energy to son with control module
Each electricity consumption module that is converted into that the electric energy of system supply carries out different step voltages is powered, while in the control of microprocessor module
System is lower to complete being controlled for power-off for each electricity consumption module.
6. a kind of quasi-distributed underground heat shallow well temperature method of real-time, which is characterized in that include the following steps：
Lay temperature sensing network；Temperature sensing network includes N temperature sensor string；N≥1；Every temperature sensor string packet
Include an at least optical fiber Bragg grating temperature sensor；
Optical signal is sent out to every temperature sensor string；
The optical signal prosessing for receiving the return of every temperature sensor string obtains light wave long message；
The light wave long message and the initial wavelength of respective sensor on the sensor string are compared, temperature information is obtained.
7. according to the method described in claim 6, it is characterized in that：Sending out optical signal to every temperature sensor string includes：
It controls scanning light source and emits continuous spectrum；
Continuous spectrum is divided into the roads N optical signal via fiber coupler；
Enter a temperature sensor string via the port 1 of three port photocirculators and port 2 per road optical signal.
8. the method according to the description of claim 7 is characterized in that receiving the optical signal prosessing that every temperature sensor string returns
Optical wavelength is obtained, including：
Port 2 and port 3 of the optical signal that temperature sensor string returns through optical circulator enter photoelectric signal transformation and processing
System obtains light wave long message through photodetection, analog-to-digital conversion and acquisition process.
9. according to the method described in one of claim 6-8, which is characterized in that laying temperature sensing network includes：
Casing is laid in underground heat shallow well；
By every temperature sensor string bondage on lower rope for drawing water from a well of the end with weight, and goes into the well and be laid in described sleeve pipe.
10. according to the method described in claim 6, it is characterized in that：Further include that temperature information is locally stored and/or is passed
Transport to control centre.
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