CN108871658A - Fibre optic compression sensor, fiber-optic pressure sensor system and pressure measurement method - Google Patents
Fibre optic compression sensor, fiber-optic pressure sensor system and pressure measurement method Download PDFInfo
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- CN108871658A CN108871658A CN201710338169.1A CN201710338169A CN108871658A CN 108871658 A CN108871658 A CN 108871658A CN 201710338169 A CN201710338169 A CN 201710338169A CN 108871658 A CN108871658 A CN 108871658A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of fibre optic compression sensor and fiber-optic pressure sensor systems, are related to sensing technology, which includes：Pressure sensing portion on optical fiber, and the reflector in optical fiber one end, reflector goes back the test signal reflex for measuring pressure, device by sending the test signal receives, and the pressure of pressure sensing portion is determined by the light intensity of the reflection signal, which does not include active device, it can be with independent utility in hazardous environment, it mismatches using explosion-protection equipment, applied widely, use cost is low.
Description
Technical field
The present invention relates to sensing technology more particularly to a kind of fibre optic compression sensors, fiber-optic pressure sensor system and pressure
Measurement method.
Background technique
In industrial production and management, sensor based on electrical principles, such as：Piezoresistive transducer, electricity
Appearance formula, ultrasonic sensor etc. are widely used.But to petroleum class I liquid I or other high-risks such as inflammable and explosive
When liquid and deep-etching liquid carry out pressure measurement, then the pressure sensor using nonelectronic safe anti-explosion is needed, because
It may set off an explosion for electric spark and wait the appearance of dangerous situations.
It is carrier, optical fiber for medium that fiber-optic pressure sensor, which is using light, and perception and transmission ambient pressure signal have volume
The advantages that small, light-weight, long transmission distance, electrical insulating property is strong, electromagnetism interference.Meanwhile the sensor can bear high temperature, height
The extreme conditions such as pressure and strong impact and vibration, the pressure detecting suitable for the environment such as inflammable and explosive, high temperature and high pressure.
Traditional fiber pressure sensor based on intensity modulated, typically independent a set of test macro, optical path are single
To, including light source (Light-emitting diode LED or laser), photodiode, pressure sensing portion, optical fiber etc..It, can when measurement
Continuous continual work.
Fig. 1 is the light path schematic diagram of existing fibre optic compression sensor, and optical path is one-way transmission.Light is from pressure sensing portion
The one end divided enters, and the other end comes out, and receives the intensity of light by measurement to judge the size of pressure.The disadvantage is that the pressure sensing
Device be it is active, needing explosion-protection equipment could apply.
Summary of the invention
The present invention provides a kind of fibre optic compression sensor and fiber-optic pressure sensor system, to solve optical fiber in the prior art
Pressure sensor is active, it has not been convenient to the problem of using.
According to one aspect of the present invention, a kind of fibre optic compression sensor is provided, including：Pressure sensing on optical fiber
Part, and the reflection unit in optical fiber one end, wherein：
Pressure sensing portion, for the fiber optic conduction pressure, the pressure to make light in the optical fiber transmission process
In be lost；
Reflection unit is used for reflected measurement signal.
Further, which further includes：
Optical splitter, the first output end connect pressure sensing portion, and second output terminal is filled by the second reflection of optical fiber connection
It sets as referring to optical path；
Wherein, the difference of the length of two optical paths is greater than the signal width of measuring signal.
Further, further include：
At least one variable optical attenuation device is arranged on the reference light road, and/or, it is arranged in the pressure sensing
In optical path where part.
Preferably, the optical splitter is specially：
Equal part optical splitter, or
Not equal part optical splitter.
Preferably, the reflection unit is specially：
Plate the reflector of film type；Or
The reflector of fiber grating type；Or
Reflecting mirror.
The embodiment of the present invention correspondingly provides a kind of fiber-optic pressure sensor system, including at least one embodiment of the present invention mentions
The fibre optic compression sensor of confession further includes：
Optical measuring device for sending the measuring signal of measurement pressure, and receives reflected measuring signal, according to this
Measuring signal determines the pressure value of pressure sensing portion.
It further, further include the optical splitter of a multiple-channel output, input terminal connects the optical measuring device, each output
One fibre optic compression sensor of end connection；
Wherein, the difference of the total length of every two branch optical path is all larger than setting value.
The embodiment of the present invention correspondingly provides a kind of fiber-optic pressure sensor system, including at least one embodiment of the present invention mentions
The fibre optic compression sensor of confession further includes：
Optical measuring device for sending the measuring signal of measurement pressure, and receives reflected measuring signal, according to this
Reflected measuring signal determines the pressure value of pressure sensing portion；
The output end of the serial connection of at least two optical splitters, each not connected optical splitter connects a fiber-optic pressure sensor
Device；
Wherein, every two includes that the difference of the total length of the optical path of fibre optic compression sensor is all larger than setting value.
Further, the optical splitter is not equal part optical splitter, wherein
The input terminal of the small optical path connection next stage optical splitter of Insertion Loss, the big optical path of Insertion Loss connect fibre optic compression sensor.
The embodiment of the present invention correspondingly provides a kind of pressure measurement method, including：
Measuring signal is sent to pressure sensor, the pressure sensor includes the pressure sensing portion on optical fiber,
And the reflection unit in optical fiber one end, wherein pressure sensing portion is used for the fiber optic conduction pressure, and the pressure makes
It obtains light to be lost in the optical fiber transmission process, reflection unit is used for reflected measurement signal；
According to the pressure value for determining pressure sensing portion via the reflected measuring signal of the pressure sensor.
The present invention has the beneficial effect that：Fibre optic compression sensor provided in an embodiment of the present invention, fiber-optic pressure sensor system
And pressure measurement method, including：Pressure sensing portion on optical fiber, and the reflector in optical fiber one end, reflector
The test signal reflex for measuring pressure is gone back, is received by sending the reception system in the test signal device, and anti-by this
The light intensity for penetrating signal determines the pressure of pressure sensing portion, which does not include active device, can independently answer
It in hazardous environment, mismatches using explosion-protection equipment, applied widely, use cost is low.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention without creative efforts, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is fibre optic compression sensor structural schematic diagram in the prior art；
Fig. 2 is the fibre optic compression sensor structural schematic diagram of corresponding embodiment one provided in an embodiment of the present invention；
Fig. 3 is the reflectance curves of the fibre optic compression sensor of corresponding embodiment one provided in an embodiment of the present invention；
Fig. 4 is the pressure comparative diagram of the fibre optic compression sensor of corresponding embodiment one provided in an embodiment of the present invention；
Fig. 5 is the fibre optic compression sensor structural schematic diagram of corresponding embodiment two provided in an embodiment of the present invention；
Fig. 6 is the reflectance curves of the fibre optic compression sensor of corresponding embodiment two provided in an embodiment of the present invention；
Fig. 7 is the fibre optic compression sensor structural schematic diagram of corresponding embodiment three provided in an embodiment of the present invention；
Fig. 8 is the reflectance curves of the fibre optic compression sensor of corresponding embodiment three provided in an embodiment of the present invention；
Fig. 9 is the fiber-optic pressure sensor system structure diagram of corresponding embodiment four provided in an embodiment of the present invention；
Figure 10 is the fiber-optic pressure sensor system structure diagram of corresponding embodiment five provided in an embodiment of the present invention；
Figure 11 is the reflectance curves of the fiber-optic pressure sensor system of corresponding embodiment five provided in an embodiment of the present invention；
Figure 12 is the fiber-optic pressure sensor system structure diagram of corresponding embodiment six provided in an embodiment of the present invention；
Figure 13 is the reflectance curves of the fiber-optic pressure sensor system of corresponding embodiment six provided in an embodiment of the present invention；
Figure 14 is pressure measurement method flow chart provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 2 a, a kind of fibre optic compression sensor provided in an embodiment of the present invention, including：Pressure on optical fiber
Transducing part 201, and the reflector 202 in optical fiber one end, wherein：
Pressure sensing portion 201, for fiber optic conduction pressure, which to damage light in optical fiber transmission process
Consumption；
Reflector 202 is used for reflected measurement signal.
The fibre optic compression sensor does not include active device, can mismatch with independent utility in hazardous environment using anti-
Quick-fried device, applied widely, use cost is low.
Micro-bend type pressure sensor can be used in pressure sensing portion 201 in the embodiment of the present invention, as shown in Figure 2 b, micro-
Kinking structure includes the castellated plates that a pair of of Machine cycle is A, and optical fiber is passed through among castellated plates, produced under the directed force F of castellated plates
Raw periodically bending.When castellated plates are by external disturbance, the micro-bend degree of optical fiber changes, so as to cause the function of output light
Rate changes.Measure the size of external pressure indirectly by optical power change that photodetector detects.By being carried to light
The detection of intensity of wave just can determine that the displacement of anamorphoser proportional thereto, and determine pressure size.
By the pressure sensor, as soon as sending a test pulse in optical fiber one end, a reflection peak can be received, is surveyed in advance
Reflection peak when trying a reflection peak when no pressure, then monitoring pressure, by the difference (after taking log) of reflection peak, just
Actual pressure value can be calculated.If there is connector, connector is also possible to that a reflection peak can be generated, this reflection peak is not anticipated
Justice can be ignored.Such device is as a survey pressure pressure sensor node.A large amount of pressure sensor nodes can pass through light
Distribution network (Optical Distribution Network, ODN) is attached, with optical measuring device (such as optical time domain reflection
Instrument OTDR) all reflection signals in measuring signal, then receiving light path are sent, and carry out identification and data processing, it is to be understood that it is each
The pressure value of sensor.Wherein, measuring signal can be test pulse or cycle tests, and cycle tests can be further specific
For pseudo noise code or mutual-complementing code.
Wherein, reflector can be specially：
Plate the reflector of film type；Or
The reflector of fiber grating type；Or
Reflecting mirror.
Embodiment one
As shown in Figure 2 a, which does not have the relevant control circuit of any electricity and electrical interface, without light yet
Source and photodiode are passive sensors.In optical path, test light pulse is incident in optical fiber from the end c, and the end c can be reserved
Connector is also possible to a bit of naked fibre, and for welding, the end emergent light b connects reflector, and reflection implement body can be plated film class
The reflector of type is also possible to the reflector of fiber grating type.
As shown in figure 3, testing out reflective light intensity (taking log, similarly hereinafter) is p in no pressureA, there is pressure condition
Under, testing out reflective light intensity is pB, light intensity difference Δ p=pA-pB, can be obtained by pressure f in Fig. 4 and the relationship of light intensity difference Δ p
Pressure value out.Under actual conditions, the relationship of pressure and light intensity difference can be tested by pressure sensing manufacturer to be provided.
The fibre optic compression sensor of embodiment one is relatively specific for the scene not high to pressure test required precision, such as light
Network is more stable, i.e., optical measuring device is opposite with the optical path loss between sensor node stable.However, due to practical application
When, the intensity for reflecting signal is influenced by factors such as fiber lengths, connector, light stability degree, and reflected intensity is also impacted therewith.
To solve this problem, measuring accuracy is improved, the embodiment of the present invention provides following preferred scheme.
Embodiment two
Measuring accuracy is improved, reflected light can be referred to by increasing by one, light intensity also dynamically becomes with above-mentioned factor together
Change, i.e., if the ratio between reflective light intensity with reference to light intensity and after pressure sensing portion (takes when the pressure applied is constant
It is exactly difference after log) not with above-mentioned factor dynamic change, that is, be exactly the ratio size of this reflective light intensity only becomes with pressure
Change.It realizing two independent reflection peaks, then can be divided by 1 × 2 optical splitter, branch directly adds reflector all the way,
Reflected light, which is used as, refers to light intensity, and another way branch is used for the reflection of sensor.In optical path, the reflector of Liang Ge branch
Range difference to 1 × 2 optical splitter wants sufficiently large, is at least greater than the length of test pulsewidth in a fiber, avoids reflection overlap of peaks,
Hardly possible is differentiated.
As shown in figure 5, the fibre optic compression sensor further includes：Optical splitter 203, the first output end connect pressure sensing portion
201, second output terminal connects the second reflection unit 202 as referring to optical path by optical fiber；
Wherein, the difference of the length of two optical paths is greater than the signal width of measuring signal.
When measuring signal is pulse, signal width can be specially the pulsewidth of pulse signal, when measuring signal is to survey
When measuring sequence, signal width can be specially the symbol width for measuring sequence.
In Fig. 5, c point is fiber connector, and a point is to increase reflector with reference to reflection position point, and b point is sensor reflection
Location point increases reflector.It tests light pulse to enter from c point, passes through optical splitter (such as 20%：80%) a point and b point, reflection are arrived
After return c point, raw 2 reflection peaks of common property.Reference axis in Fig. 6 indicates the relationship of distance and light intensity, it is assumed that c point to a point
Distance is L, and c point to b point distance is M, in order to make two reflection peaks not generate overlapping, | M-L | it is greater than the distance of test pulsewidth.
Because c point is connector, that just again can be more a reflection peak may when reflection peak heights and neighboring reflection peak are not much different
Measurement accuracy is influenced, at this moment the value of L is also greater than the distance of test pulsewidth, avoids reflection overlap of peaks.C point can be fusion point,
It does not reflect thus, L is not also just required.
Ordinate p in Fig. 6 indicates light intensity (power, the value after taking log), the light of two reflection peaks when p0 indicates no pressure
Strong difference, (p0+ Δ p) is light intensity difference when having pressure, and Δ p is the difference of light intensity when having pressure and no pressure, passes through Δ p and pressure
The relationship of power can obtain pressure value.
When practical application, p0 can be positive and (be higher than sensor reflection peak when no pressure with reference to reflection peak), and can be negative (reference
Reflection peak is lower than sensory reflex peak when no pressure), the position of a point and b point also can be interchanged (i.e. can with reference to reflection branch length
Than sensing branch head).Optical splitter used may be either equal part optical splitter, can also be non-equal part optical splitter.
Pressure sensor in embodiment two is just to calculate pressure value by Δ p, and from reflectivity curve, can only be read
P0+ Δ p out, such p0 value must be known in advance.When its tangible sensor production is completed, the value of p0 is it has been determined that sensor goes out
When factory, p0 value should be provided.Because in sensor processing and fabricating, inevitably will appear technologic error, each sensor p0 value may
Can be different, when multisensor monitoring nodes calculate, it just must be known by the p0 of each sensor node, be unfavorable for answering on a large scale
With.
Embodiment three,
In order to solve the problems, such as that each sensor p0 value may be inconsistent, increase by one on the light reflection branch road for reference
A variable optical attenuation device is gone here and there between optical splitter and reflector, and effect is two reflections when p0 is adjusted to 0dB, i.e. no pressure
Peak heights are the same.At this moment two reflection peak to peak values are exactly Δ p, do not need the value that p0 is known in advance.
In the application, variable optical attenuation device can go here and there any branch after optical splitter, as long as in no pressure, two
A reflection peak, that high branch add light attenuation device.Even can two branches can respectively go here and there variable optical attenuation dress
It sets.In addition, it is 0dB that the p0 value of each sensor node is adjustable, also adjustable is a fixed value.
As shown in fig. 7, the fibre optic compression sensor further includes：
At least one variable optical attenuation device 204 is arranged on reference light road, and/or, it is arranged in pressure sensing portion institute
Optical path on.
As shown in figure 8, same, ordinate p indicates light intensity (power, the value after taking log), and two when p0 indicates no pressure are anti-
The light intensity difference at peak is penetrated, (p0+ Δ p) is light intensity difference when having pressure, and Δ p is the difference of light intensity when having pressure and no pressure, is led to
The relationship of Δ p and pressure is crossed, can obtain pressure value.Since p0 value is fixed, it is possible to directly be obtained by two reflection peak to peak values
Δp。
Example IV,
The embodiment of the present invention also provides a kind of fiber-optic pressure sensor system, to complete pressure test, as shown in figure 9, should
Fiber-optic pressure sensor system includes fibre optic compression sensor 901 provided in an embodiment of the present invention, further includes：
Optical measuring device 902 for sending the measuring signal of measurement pressure, and receives reflected measuring signal, root
The pressure value of pressure sensing portion is determined according to the reflected measuring signal.
Optical measuring device 902 also can connect monitoring computer room, and the calculating and statistics, prison of pressure value are realized by monitoring computer room
The function of survey.
Fibre optic compression sensor 901 in the present embodiment can use embodiment one, embodiment two, reality according to the actual situation
Apply any one of example three fibre optic compression sensor.
Embodiment five,
In order to connect multiple sensor nodes, the non-equal optical splitters (such as 5% of increase by least two 1 × 2：95% output
Than), multiple sensor nodes are connected under a network topology, a recurrent network are formed, convenient for detecting simultaneously.
As shown in Figure 10, in the fiber-optic pressure sensor system, further include：
The output end of the serial connection of at least two optical splitters 903, each not connected optical splitter 903 connects an optical fiber pressure
Sensor 901.
Wherein, every two includes that the difference of the total length of the optical path of fibre optic compression sensor is all larger than setting value.
Further, optical splitter 903 is not equal part optical splitter, wherein
The input terminal of the small optical path connection next stage optical splitter 903 of Insertion Loss, the big optical path of Insertion Loss connect fiber-optic pressure sensor
Device 901.
Specifically, the input of optical splitter 903 terminates trunk optical fiber, the big branch of Insertion Loss (5%) connection all the way in two branches
Fibre optic compression sensor 901, another way (95%) is by after one section of optical fiber, then goes here and there a not equal part optical splitter 903, two branches
Connection with it is as before, thus can connect more fibre optic compression sensors 901.By optical measuring device, reality is tested out
When reflectivity curve, when using fibre optic compression sensor in embodiment two, the schematic diagram of reflectivity curve is as shown in figure 11, each
Corresponding two reflection peaks of a fibre optic compression sensor change (P0 by the difference DELTA p of the reflection peak of each fibre optic compression sensor
It is not 0, the difference of reflection peak is P0+ Δ P, P0 it is known that Δ P can be found out), the pressure of each fibre optic compression sensor can be calculated
Power size, to realize multinode real-time monitoring.It should be noted that the distance in networking between fibre optic compression sensor, anti-
It penetrates on curve, there can be no reflection overlap of peaks, if when without other reflection peaks, distance is at least greater than two reflection peaks
The distance of distance plus a test pulsewidth.When there are other to reflect (such as connector), needs to increase distance and avoided, guarantee will not
Be overlapped, that is, every two include the total length of the optical path of fibre optic compression sensor difference be at least greater than two reflection peaks away from
It also again to include the optical path of fibre optic compression sensor by every two if there is other reflections from adding with a distance from a test pulsewidth
The setting value that is greater than of difference of total length increase.
In application, can also using etc. divide optical splitter, i.e., 50%：50% output ratio, at this point, the optical fiber pressure for including in system
Force snesor can be less.If ODN is allowed to support more sensor nodes, it is optimal, point of different splitting ratios can be used
Light device is applied in combination, basic principle be it is closer from optical measuring device, the splitting ratio of use is bigger, remoter from optical measuring device, adopts
Splitting ratio is smaller, until 50%：50%.
Embodiment six,
Using star net forming topology, divides optical splitter using 1 × n etc., then reconnects each fibre optic compression sensor,
n≥2。
As shown in figure 12, in the fiber-optic pressure sensor system, further include：
The optical splitter 904 of one multiple-channel output, input terminal connect optical measuring device 902, and each output end connects one
Fibre optic compression sensor 901；
Wherein, the difference of the total length of every two branch optical path is all larger than setting value.
When using the fibre optic compression sensor in embodiment two, the schematic diagram of reflectivity curve is as shown in figure 13, in order to keep away
Exempt to reflect overlap of peaks, each 901 to 1 × n of fibre optic compression sensor etc. divides the distance between optical splitter identical.Distance is wanted
Ask identical as embodiment five.Further, the optical splitter of 1 × n is also possible to the optical splitter of non-equal part.
Optical measuring device and monitoring computer room in example IV, embodiment five and embodiment six, can also be specially built-in
The optical module of measurement function adds control equipment, then by the method for networking, carries out remote monitoring and control.
The embodiment of the present invention correspondingly provides a kind of pressure measurement method, as shown in figure 14, including：
Step S1401, measuring signal is sent to pressure sensor, pressure sensor includes the pressure sensing on optical fiber
Part, and the reflection unit in optical fiber one end, wherein pressure sensing portion is used for the fiber optic conduction pressure, the pressure
Light is lost in the optical fiber transmission process in power, and reflection unit is used for reflected measurement signal；
Step S1402, according to the pressure for determining pressure sensing portion via the reflected measuring signal of pressure sensor
Value.
Further, pressure sensor further includes optical splitter, and the first output end connects pressure sensing portion, second output terminal
It connects the second reflection unit by optical fiber to be used as referring to optical path, wherein the difference of the length of two optical paths is greater than measuring signal
Signal width；
Step S1420 is specifically included：
Pressure sensing portion is determined according to reflected two measuring signals of two optical paths via pressure sensor
Pressure value.
Light pressure sensor, fiber-optic pressure sensor system and pressure measurement method provided in an embodiment of the present invention, can answer
The case where for close to distribution type fiber-optic pressure sensing, carries out real-time monitoring to great deal of nodes, can be mentioned with anti-light fine link interference
It rises and surveys pressure precision, using passive mode, do not need to increase explosion-protection equipment.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and the highlights of each of the examples are the differences of itself and other embodiments.Particularly with device
For embodiment, due to its substantially similar and embodiment of the method, so, it is described relatively simple, related place is referring to method reality
Apply the part explanation of example.
Although describing the application by embodiment, it will be apparent to one skilled in the art that the application is there are many deformation and becomes
Change without departing from the spirit and scope of the present invention.If being wanted in this way, these modifications and changes of the present invention belongs to right of the present invention
Ask and its equivalent technologies within the scope of, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of fibre optic compression sensor, which is characterized in that including：Pressure sensing portion on optical fiber, and it is in light
The reflection unit of fine one end, wherein：
Pressure sensing portion, for the fiber optic conduction pressure, the pressure to go out light in the optical fiber transmission process
Now it is lost；
Reflection unit is used for reflected measurement signal.
2. fibre optic compression sensor as described in claim 1, which is characterized in that further include：
Optical splitter, the first output end connect pressure sensing portion, and second output terminal connects the second reflection unit by optical fiber and makees
For referring to optical path；
Wherein, the difference of the length of two optical paths is greater than the signal width of measuring signal.
3. fibre optic compression sensor as claimed in claim 2, which is characterized in that further include：
At least one variable optical attenuation device is arranged on the reference light road, and/or, it is arranged in the pressure sensing portion
In the optical path at place.
4. fibre optic compression sensor as claimed in claim 2 or claim 3, which is characterized in that the optical splitter is specially：
Equal part optical splitter, or
Not equal part optical splitter.
5. fibre optic compression sensor a method according to any one of claims 1-3, which is characterized in that the reflection unit is specially：
Plate the reflector of film type；Or
The reflector of fiber grating type；Or
Reflecting mirror.
6. a kind of fiber-optic pressure sensor system, which is characterized in that including at least one optical fiber a method according to any one of claims 1-3
Pressure sensor further includes：
Optical measuring device for sending the measuring signal of measurement pressure, and receives reflected measuring signal, according to the reflection
Measuring signal back determines the pressure value of pressure sensing portion.
7. system as claimed in claim 6, which is characterized in that further include the optical splitter of a multiple-channel output, input terminal connects
The optical measuring device is connect, each output end connects a fibre optic compression sensor；
Wherein, the difference of the total length of every two branch optical path is all larger than setting value.
8. a kind of fiber-optic pressure sensor system, which is characterized in that including at least one optical fiber a method according to any one of claims 1-3
Pressure sensor further includes：
Optical measuring device for sending the measuring signal of measurement pressure, and receives reflected measuring signal, according to the reflection
Measuring signal back determines the pressure value of pressure sensing portion；
The output end of the serial connection of at least two optical splitters, each not connected optical splitter connects a fibre optic compression sensor；
Wherein, every two includes that the difference of the total length of the optical path of fibre optic compression sensor is all larger than setting value.
9. system as claimed in claim 8, which is characterized in that the optical splitter is not equal part optical splitter, wherein
The input terminal of the small optical path connection next stage optical splitter of Insertion Loss, the big optical path of Insertion Loss connect fibre optic compression sensor.
10. a kind of pressure measurement method, which is characterized in that including：
Measuring signal is sent to pressure sensor, the pressure sensor includes the pressure sensing portion on optical fiber, and
Reflection unit in optical fiber one end, wherein pressure sensing portion is used for the fiber optic conduction pressure, and the pressure makes light
It is lost in the optical fiber transmission process, reflection unit is used for reflected measurement signal；
According to the pressure value for determining pressure sensing portion via the reflected measuring signal of the pressure sensor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338169.1A CN108871658A (en) | 2017-05-15 | 2017-05-15 | Fibre optic compression sensor, fiber-optic pressure sensor system and pressure measurement method |
| PCT/CN2018/086884 WO2018210236A1 (en) | 2017-05-15 | 2018-05-15 | Optical fiber pressure sensor, optical fiber pressure sensing system and method for pressure measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338169.1A CN108871658A (en) | 2017-05-15 | 2017-05-15 | Fibre optic compression sensor, fiber-optic pressure sensor system and pressure measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532706A (en) * | 2021-08-02 | 2021-10-22 | 广东电网有限责任公司中山供电局 | Optical fiber sensor for detecting optical cable light path |
| RU218106U1 (en) * | 2022-09-15 | 2023-05-11 | ООО "Научно-исследовательские и опытно-конструкторские работы в оптоволоконной технике" | Fiber Optic Reflective Type Vibration Sensor |
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