CN106918390A - A kind of receiving terminal optical power control system for optical fiber vibration sensing - Google Patents
A kind of receiving terminal optical power control system for optical fiber vibration sensing Download PDFInfo
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- CN106918390A CN106918390A CN201710254542.5A CN201710254542A CN106918390A CN 106918390 A CN106918390 A CN 106918390A CN 201710254542 A CN201710254542 A CN 201710254542A CN 106918390 A CN106918390 A CN 106918390A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0607—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature
- H01S5/0614—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature controlled by electric field, i.e. whereby an additional electric field is used to tune the bandgap, e.g. using the Stark-effect
Abstract
The invention discloses a kind of receiving terminal optical power control system for optical fiber vibration sensing, the light exit side mouthful of light source is connected by vibrating sensing optical fiber with optical splitter, second light splitting branch road of optical splitter is connected with photo-detector light path, light signal strength is converted to light intensity analog electrical signal by photo-detector, amplifier is used to amplify light intensity analog electrical signal, light intensity analog electrical signal after amplification is converted to analog-digital converter the data signal for representing light intensity, whether threshold determination device is used to judge for the data signal for representing light intensity less than default normal optical power threshold, if it is increase output regulation is digital；The regulation numeral is converted into analog signal by optical power adjustment module；Drive circuit module adjusts the driving current intensity of light source so as to adjust the Output optical power of light source according to analog signal.The invention provides a kind of system that can obtain metastable received optical power at photo-detector end in inexpensive vibration sensing system.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly, to a kind of receiving terminal for optical fiber vibration sensing
Optical power control system.
Background technology
In general optical fiber vibration sensing system, the general design using fixed emergent light luminous power.Gone out using fixed
Penetrating light luminous power can ensure light source output power stabilization.But, during the installation and deployment of optical fiber vibration sensing system, pass
The length of the different coupled mode of photosensitive fibre and sensor fibre, can all cause the different degrees of damage in optical fiber link of optical signal
Consumption.So even identical two unjacketed optical fibers vibrating sensing equipment of outgoing luminous power, in different installation and deployment environment
It also is difficult to obtain identical incidence (reception) luminous power.
Received optical power is an important references amount whether occurred for detection vibration in optical fiber vibration sensing system.This
One reference quantity changes and is likely to result in various problems：1st, luminous power is visited more than photo-detector investigative range or luminous power less than light
Survey device investigative range；2nd, luminous power changes the vibration detection result in the same vibration detecting system of influence；3rd, luminous power is not
Inconsistent vibration detection result is likely to be obtained with different fiber-optic vibration detecting systems is caused.
In order to meet remote sensing demand, these optical fiber vibration sensing systems often use larger luminous power, and
Optical power loss in photo-detector rear end adapts to different installation environments using casacade multi-amplifier.But in some low cost opticals
In fiber sensor system, the high cost of multistage amplifier unit.So needing a kind of relatively easy method to cause inexpensive vibration
Sensor-based system can obtain metastable received optical power at photo-detector end.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of connecing for optical fiber vibration sensing
Receiving end optical power control system, can obtain in inexpensive vibration sensing system its object is to provide one kind in optical signal receiving terminal
The system for obtaining metastable received optical power, thus solves to be visited in light in inexpensive vibration sensing system in the prior art
Survey the technical problem that device end obtains metastable received optical power.
To achieve the above object, the invention provides a kind of receiving terminal optical power control system for optical fiber vibration sensing
System, including light source, optical splitter, photo-detector, amplifier, analog-digital converter, first threshold determinant, optical power adjustment module with
And drive circuit module, wherein：
The light exit side mouthful of the light source is connected by vibrating sensing optical fiber with optical splitter；
The optical splitter is used to for the emergent light of the light source to be at least divided into two light splitting branch roads, wherein the optical splitter
First light splitting branch road is connected with optical fiber vibration sensing detector light path, the second light splitting branch road and the optical detection of the optical splitter
Device light path is connected；
The output of the photo-detector is connected with the input of the amplifier, and the photo-detector is used to detect described second
The light signal strength of light splitting branch road, and the light signal strength is converted into light intensity analog electrical signal；
The output of the amplifier is connected with the input of the analog-digital converter, and the amplifier is used to amplify the light intensity
Analog electrical signal, makes the voltage strength of the light intensity analog electrical signal after amplification be in the range of the voltage measurement of analog-digital converter；
The output of the analog-digital converter is connected with the input of the first threshold determinant, and the analog-digital converter is used for
Light intensity analog electrical signal after the amplification is converted to the data signal for representing light intensity；
The output of the first threshold determinant is connected with the input of the optical power adjustment module, and the first threshold is sentenced
Whether device is determined for judging the data signal for representing light intensity less than normal optical power threshold is preset, and is if it is increased
Output regulation numeral；
The output of the optical power adjustment module is connected with the drive circuit module, and the optical power adjustment module is used for
The regulation numeral is converted into analog signal；
The output of the drive circuit module is connected with the light source, and the drive circuit module is used for according to the simulation
Signal is come the Output optical power that adjusts the driving current intensity of the light source so as to adjust light source.
In one embodiment of the present of invention, the optical power control system also includes driving current monitoring modular and the second threshold
Value determinant, wherein, the input of the driving current monitoring modular is connected with the output of the drive circuit module, the driving
The output of current monitoring module is connected with Second Threshold determinant；The driving current monitoring modular is used to obtain the driving electricity
The driving current of road module output, the Second Threshold determinant is used to judge the driving current of the drive circuit module output
Whether it is more than the nominal drive current of the light source, if it is reduces the output regulation numeral of the Second Threshold determinant.
In one embodiment of the present of invention, during driving current rises, the first threshold determinant is additionally operable to
The receiving terminal luminous power before stored adjustment before regulating optical power, and receiving terminal luminous power after regulation is obtained after adjustment, and sentence
Whether receiving terminal luminous power if it is reduces the first threshold and sentences less than receiving terminal luminous power before regulation after the disconnected regulation
Determine the output regulation numeral of device.
In one embodiment of the present of invention, the first threshold determinant is in the light intensity value for receiving less than given threshold
Start optical power adjustment during preset ratio.
In one embodiment of the present of invention, the optical power adjustment module be digital regulation resistance, or numeral slide variable resistance
Device, or digital analog converter.
In one embodiment of the present of invention, the optical splitter is the optical splitter of one-to-two.
In one embodiment of the present of invention, the light splitting ratio of the optical splitter is 90%:10%, and 10% access optical detection
Device light path, another 90% incoming fiber optic vibrating sensing detector light path.
In one embodiment of the present of invention, the light source is FP lasers, or Distributed Feedback Laser, or LED light source and rise
The combination of inclined device.
In one embodiment of the present of invention, the optical power control system also include memory module, the memory module with
First threshold determinant communication connection, for storing receiving terminal luminous power before the regulation.
In one embodiment of the present of invention, the preset ratio for starting optical power adjustment is 30%.
In general, by the contemplated above technical scheme of the present invention compared with prior art, with following beneficial effect
Really：
(1) provided by the present invention for the receiving terminal optical power control system of optical fiber vibration sensing, visited by photo-detector
The intensity of the optical signal that light-metering source sends, and whether the light intensity is judged less than Intensity threshold is preset by threshold decision device, such as
Fruit is that then increase output regulation is digital, and the driving current of light source is adjusted by optical power adjustment module and drive circuit module, with
Increase the emergent light luminous power of light source, so as to ensure stablizing relatively for receiving terminal luminous power；Optical power control system structure letter
It is single, it is with low cost；Can be used for low-cost optical fiber vibration sensing system to calibrate received optical power；And optical power intensity can be reduced
The negative effect that is brought to fiber-optic vibration accuracy of detection and uniformity of change；There is provided one kind in inexpensive vibration sensing system
In the scheme of metastable received optical power is obtained in optical signal receiving terminal；
(2) provided by the present invention for the receiving terminal optical power control system of optical fiber vibration sensing, supervised by driving current
The driving current of module monitors light source is surveyed, optical power adjusting is passed through when the driving current of light source exceedes its running current upper limit
Section module and drive circuit module are adjusted back to the driving current of light source, that is, reduce the driving current of light source；Such that it is able to protect
The running current upper limit of the drive current adjustment not over light source of light source is protected, completion is not yet connected in sensor fibre link
Or light source works state labile or the lost of life are prevented under other egregious cases or even is scrapped；
(3) provided by the present invention for the receiving terminal optical power control system of optical fiber vibration sensing, in lifting driving current
During, the received optical power before being lifted by recording driving current, received optical power after driving current is lifted with carry
Rise before received optical power compare, determine driving current lifting operation whether rollback；Temperature can be reduced effect is lifted to driving current
The negative effect of fruit；
(4) provided by the present invention for the receiving terminal optical power control system of optical fiber vibration sensing, in luminous power less than just
Start step-by-step movement optical power adjustment program during ordinary light work(, actively sluggish stepped intervals times during step-by-step adjustment luminous power, so that
Reduce the frequency of power adjustment, it is to avoid the noise that frequent adjustment luminous power is introduced.Simultaneously small stepping ensure that power is adjusted
The whole precision to normal luminous power；
(5) provided by the present invention for the receiving terminal optical power control system of optical fiber vibration sensing, in the light intensity for receiving
Value starts optical power adjustment when being less than the preset ratio of given threshold, frequent starting can be avoided to adjust and cause optical power fluctuation.
Brief description of the drawings
Fig. 1 is that a kind of structure of receiving terminal optical power control system for optical fiber vibration sensing in the embodiment of the present invention is shown
It is intended to；
Fig. 2 is the structure of another receiving terminal optical power control system for optical fiber vibration sensing in the embodiment of the present invention
Schematic diagram；
Fig. 3 is the structure of another receiving terminal optical power control system for optical fiber vibration sensing in the embodiment of the present invention
Schematic diagram；
Fig. 4 is the circuit knot of a kind of drive circuit module, driving current monitoring modular and light source in the embodiment of the present invention
Structure schematic diagram.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
As shown in figure 1, being a kind of receiving terminal optical power control system for optical fiber vibration sensing in the embodiment of the present invention
Structural representation, including light source, optical splitter, photo-detector, amplifier, analog-digital converter, first threshold determinant, luminous power
Adjustment module and drive circuit module, wherein：
The light exit side mouthful of the light source is connected by vibrating sensing optical fiber with optical splitter；Specifically, the light source can be with
From FP (Fabry-P é rot, Fabry Perot) laser, or DFB (Distributed Feedback Laser, distribution
Formula feedback laser) laser, or LED light source (Light Emitting Diode, light emitting diode) and the polarizer group
Close.
The optical splitter is used to for the emergent light of the light source to be at least divided into two light splitting branch roads, wherein the optical splitter
First light splitting branch road is connected with optical fiber vibration sensing detector light path, the second light splitting branch road and the optical detection of the optical splitter
Device light path is connected；Specifically, emergent light can be divided into two parts or many parts by the optical splitter, it is usually preferred to the light splitting of one-to-two
Device；The optical splitter can be the optical splitter of arbitrary proportion, it is only necessary to which the emergent light of light source is divided into two.Such as light splitting
Ratio can be 50：50, or 90:10.It is preferred that 90:10, and 10% access photo-detector light path, another 90% incoming fiber optic
Vibrating sensing detector light path, the sensing detection of fiber-optic vibration is realized for the change by detecting light intensity.
The output of the photo-detector is connected with the input of the amplifier, and the photo-detector is used to detect described second
The light signal strength of light splitting branch road, and the light signal strength is converted into light intensity analog electrical signal.
The output of the amplifier is connected with the input of the analog-digital converter, and the amplifier is used to amplify the light intensity
Analog electrical signal, makes the voltage strength of the light intensity analog electrical signal after amplification be in the range of the voltage measurement of analog-digital converter.
The output of the analog-digital converter is connected with the input of the first threshold determinant, and the analog-digital converter is used for
Light intensity analog electrical signal after the amplification is converted to the data signal for representing light intensity.
The output of the first threshold determinant is connected with the input of the optical power adjustment module, and the first threshold is sentenced
Whether device is determined for judging the data signal for representing light intensity less than normal optical power threshold is preset, and is if it is increased
Output regulation numeral, so as to increase light source luminous power.Specifically, if the data signal for representing light intensity is less than default
Normal optical power threshold, then the regulation of the first threshold determinant output is digital increases T；The T is according to degree of regulation and tune
Section step-length determines, for example, can be 1, or 2, or other values；During regulation, the T can also be become
Change, such as when the data signal for representing light intensity is more less than default normal optical power threshold, the T can take
Value is slightly larger (adjusting step-length larger), when the data signal for representing light intensity is more close to normal optical power threshold is preset
When, the T can be smaller with value, makes entirely to adjust process first quick and back slow, and tune is also can guarantee that on the premise of governing speed is ensured
Section precision, is unlikely to cause that certain regulation result is too many beyond normal optical power threshold is preset；
Further, because Fibre Optical Sensor link luminous power totally present attenuation trend, and in short-term from the point of view of luminous power phase
To more stable.So optical power adjustment is to be adjusted to more bloom power direction.Luminous power is caused to avoid frequent starting from adjusting
Fluctuation, the threshold value that optical power adjustment is started in implementation is 30%, i.e., the light intensity value that first threshold determinant is received is less than setting
The 30% of threshold value just starts optical power adjustment.After starting optical power adjustment, first threshold determinant constantly judges that luminous power has not
Have more than given threshold (such as value is 300mW), if not then first threshold is increased with step-length 1 (or other asserting values)
The regulation numeral output of determinant.Luminous power is to stop this optical power adjustment more than 300mW.
The output of the optical power adjustment module is connected with the drive circuit module, and the optical power adjustment module is used for
The regulation numeral is converted into analog signal；Wherein, the optical power adjustment module can have three kinds of implementations：Digital electricity
Position device, or digital slide rheostat, or digital analog converter (Digital to Analog Converter, DAC), its work
With driving voltage or driving current (mode of usual and specification) for modification drive circuit module, mode is by electric to driving
Road module provides variable voltage or resistance.Wherein digital regulation resistance can both provide resistance and can also provide voltage, and numeral is sliding
Dynamic rheostat can only provide resistance, and DAC can only provide voltage.
The output of the drive circuit module is connected with the light source, and the drive circuit module is used for according to the simulation
The voltage or current strength of light source described in Signal Regulation are so as to adjust the Output optical power of light source.Driving to drive circuit module
There can be two kinds of implementations：Voltage drives or electric current drives (mode of usual and specification), and Main Function is to provide higher
Driving force.Light source can also be by voltage-regulation luminous power by electric current.Optical power adjustment is from nominal power to minimum
The corresponding luminous power of threshold current, power adjusting ratio is up to 90 percent.In addition, substantially can be with to the power adjusting of light source
Regard linear as, but resolution limitations are in the bit wide of digital regulation resistance, digital slide rheostat or DAC.
Further, in some optical power adjustment simulated schemes, the driving current of light source can only be adjusted, but
It is limited to detectability and does not can determine that whether driving current exceeds the nominal drive current of light source, is likely to result in the damage of light source.
To achieve these goals, as shown in Fig. 2 being additionally provided in another embodiment of the present invention a kind of for fiber-optic vibration
The receiving terminal optical power control system of sensing, increased driving current monitoring modular and second on the basis of system shown in Figure 2
Threshold determination device, the input of the driving current monitoring modular is connected with the output of the drive circuit module, described to drive electricity
The output for flowing monitoring modular is connected with Second Threshold determinant；The driving current monitoring modular is used to obtain the drive circuit
The driving current of module output, the Second Threshold determinant is used to judge that the driving current of the drive circuit module output to be
The no nominal drive current more than the light source, if the driving current of drive circuit module output is more than the light source
Nominal drive current, then need to reduce the driving current of the drive circuit module output, specifically can be by reducing described second
The output regulation numeral of threshold determination device, so as to reduce the driving electricity of the drive circuit module by optical power adjustment module
Stream.
It should be noted that the first threshold determinant and Second Threshold determinant are functionally to be divided into two moulds
Block, specifically in implementation process, the first threshold determinant and Second Threshold determinant physically can be for can be simultaneously
Implement the entity module that Intensity threshold judges and current threshold judges, or realize that Intensity threshold judges and electricity respectively
Flow two entity modules of threshold determination.
In addition, light source can generate heat during work, because the limitation of radiating condition might have the accumulation of heat energy.Just
It is the influence due to temperature factor, the power and driving current of light source are only presented positive relationship within the scope of certain temperature.
In some radiating constrained environments, when driving current rises to certain value, light source power may begin to decline.To ensure light source work(
The validity of rate regulation to this special change, it is necessary to detect, and take the callback operation of driving current.This function is
What simulated light power conditioning circuitry cannot be realized.
To achieve these goals, driving current rise during, can before regulating optical power stored adjustment
Preceding receiving terminal luminous power, and receiving terminal luminous power after regulation is obtained after adjustment, if receiving terminal luminous power is less than tune after regulation
Receiving terminal luminous power before section, then it is believed that the power and driving current of light source come into the interval of negative sense relation, it is necessary to
Callback operation is carried out to driving current, can now reduce the output regulation numeral of the first threshold determinant, so as to pass through light
Power conditioning module reduces the driving current of the drive circuit module.Specifically, a memory module can be set to store
Receiving terminal luminous power before the regulation, the memory module can be single physical memory cell, it is also possible to be integrated in described
Memory cell in first threshold determinant.
Further, as shown in figure 3, being another receiving terminal light work(for optical fiber vibration sensing in the embodiment of the present invention
The structural representation of rate control system, the optical power control system of the optical fiber vibration sensing is mainly used in the vibration inspection of dual-polarization state
Survey.In embodiments of the present invention, optical splitter uses 10：90 one-to-two optical splitter, optical power adjustment module is slided using numeral
Rheostat, light source uses FP lasers, wherein：Light source power >=500 microwatt, threshold current 7.5mA ± 0.6mA, power output
300 microwatts, amplifier amplifies about 10000 times, and analog-digital converter bit wide 12bit, digital slide rheostat is input into bit wide 8.Drive
Dynamic circuit module is with voltage-regulation light source luminous power.Light source uses the FP lasers of 1550nm wavelength, the sensitivity of photo-detector
It is 0.98 ± 0.02mA/mW.
Further, as shown in figure 4, being a kind of drive circuit module, driving current monitoring modular in the embodiment of the present invention
And the electrical block diagram of light source, the implementation of the circuit structure is, a colelctor electrode for NPN triode and light source phase
Even, the emitter stage of NPN triode is grounded by first resistor, and the base stage of NPN triode passes through second resistance and optical power adjustment
Module is connected；NPN triode, first resistor and second resistance collectively constitute the drive circuit module in this circuit structure；Drive
Current monitoring module is connected with the emitter stage of NPN triode；In the embodiment of the present invention, the power supply can use light-emitting diodes
Pipe, its positive pole connects the power supply of 3.3V, and threshold current is 8mA；The NPN triode can select C8050, the first resistor
Resistance is 50 Ω, and second resistance is adjustable.Driving current monitoring modular can judge described by gathering current value or magnitude of voltage
Whether the driving current of light source exceedes nominal threshold value circuit.
In addition, further as shown in figure 1, luminous power digital reference amount can also be obtained at the analog-digital converter,
Used for other functions module.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of receiving terminal optical power control system for optical fiber vibration sensing, it is characterised in that including light source, optical splitter,
Photo-detector, amplifier, analog-digital converter, first threshold determinant, optical power adjustment module and drive circuit module, its
In：
The light exit side mouthful of the light source is connected by vibrating sensing optical fiber with optical splitter；
The optical splitter is used to for the emergent light of the light source to be at least divided into two light splitting branch roads, wherein the first of the optical splitter
Light splitting branch road is connected with optical fiber vibration sensing detector light path, the second light splitting branch road and the photo-detector light of the optical splitter
Road is connected；
The output of the photo-detector is connected with the input of the amplifier, and the photo-detector is used to detect second light splitting
The light signal strength of branch road, and the light signal strength is converted into light intensity analog electrical signal；
The output of the amplifier is connected with the input of the analog-digital converter, and the amplifier is used to amplify the light intensity simulation
Electric signal, makes the voltage strength of the light intensity analog electrical signal after amplification be in the range of the voltage measurement of analog-digital converter；
The output of the analog-digital converter is connected with the input of the first threshold determinant, and the analog-digital converter is used for institute
State the light intensity analog electrical signal after amplifying and be converted to data signal for representing light intensity；
The output of the first threshold determinant is connected with the input of the optical power adjustment module, the first threshold determinant
For whether judging the data signal for representing light intensity less than normal optical power threshold is preset, if it is increase output
Regulation numeral；
The output of the optical power adjustment module is connected with the drive circuit module, and the optical power adjustment module is used for institute
State regulation numeral and be converted into analog signal；
The output of the drive circuit module is connected with the light source, and the drive circuit module is used for according to the analog signal
Come the Output optical power for adjusting the driving current intensity of the light source so as to adjust light source.
2. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 1, it is characterised in that also wrapped
Driving current monitoring modular and Second Threshold determinant are included, wherein, input and the driving of the driving current monitoring modular
The output of circuit module is connected, and the output of the driving current monitoring modular is connected with Second Threshold determinant；It is described to drive electricity
Stream monitoring modular is used to obtain the driving current of the drive circuit module output, and the Second Threshold determinant is used to judge institute
State drive circuit module output driving current whether more than the light source nominal drive current, if it is reduce described the
The output regulation numeral of two threshold determination devices.
3. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 1 or 2, it is characterised in that
During driving current rises, the first threshold determinant was additionally operable to before regulating optical power be received before stored adjustment
End luminous power, and receiving terminal luminous power after regulation is obtained after adjustment, and whether receiving terminal luminous power is small after judging the regulation
In receiving terminal luminous power before regulation, if it is reduce the output regulation numeral of the first threshold determinant to cancel luminous power
Regulation operation.
4. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 1 or 2, it is characterised in that
The first threshold determinant starts optical power adjustment in preset ratio of the light intensity value for receiving less than given threshold.
5. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 1 or 2, it is characterised in that
The optical power adjustment module is digital regulation resistance, or digital slide rheostat, or digital analog converter.
6. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 1 or 2, it is characterised in that
The optical splitter is the optical splitter of one-to-two.
7. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 6, it is characterised in that described
The light splitting ratio of optical splitter is 90%:10%, and 10% access photo-detector light path, another 90% incoming fiber optic vibrating sensing detection
Device light path.
8. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 1 or 2, it is characterised in that
The light source is the combination of FP lasers, or Distributed Feedback Laser, or LED light source and the polarizer.
9. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 3, it is characterised in that also wrapped
Memory module is included, the memory module is communicated to connect with the first threshold determinant, for storing receiving terminal before the regulation
Luminous power.
10. the receiving terminal optical power control system of optical fiber vibration sensing is used for as claimed in claim 4, it is characterised in that institute
It is 30% to state preset ratio.
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