CN109506738A - A kind of distribution type fiber-optic liquid level sensor system - Google Patents
A kind of distribution type fiber-optic liquid level sensor system Download PDFInfo
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- CN109506738A CN109506738A CN201811302428.6A CN201811302428A CN109506738A CN 109506738 A CN109506738 A CN 109506738A CN 201811302428 A CN201811302428 A CN 201811302428A CN 109506738 A CN109506738 A CN 109506738A
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- 238000009826 distribution Methods 0.000 title claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 100
- 239000013307 optical fiber Substances 0.000 claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000007613 environmental effect Effects 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 3
- 239000002828 fuel tank Substances 0.000 abstract description 4
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- 239000007789 gas Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
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- 239000002760 rocket fuel Substances 0.000 description 3
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- 230000011218 segmentation Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
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- Physics & Mathematics (AREA)
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a kind of distribution type fiber-optic liquid level sensor systems, it include: fibre optic liquid level sensor, fiber Bragg grating (FBG) demodulator and adhering device, fibre optic liquid level sensor includes: optical fiber and at least two long-period fiber grating LPG sensors continuously inscribed of optical fiber axial direction along optical fiber；The output end of fibre optic liquid level sensor and fiber Bragg grating (FBG) demodulator is connected by optical fiber；Fibre optic liquid level sensor is fixed in testing container by adhering device, to form arrayed optical fiber sensing network, and then determines based on arrayed optical fiber sensing network and fiber Bragg grating (FBG) demodulator the liquid level of the solution in testing container.The present invention can not only measure distributed in three dimensions formula tank fill level information, and the reaction time is rapid, available accurate comprehensive level gauging result.Meanwhile the packaged type relative to energization instrument complexity, the weight of sensor is reduced, electricity liquid level meter spark is also eliminated and ignites the hidden danger that fuel tank causes irremediable disaster.
Description
Technical field
The invention belongs to Fiber Bragg Grating technology field more particularly to a kind of distribution type fiber-optic liquid level sensor systems.
Background technique
Since the 1960s, field of aerospace has been developed that many based on resistance, capacitor, acoustic impedance and glues
The liquid gas interface sensing device of stagnant damping difference.Currently, the typical level sensing systems of amount of liquid have drawstring in measurement fuel tank
Measurement, capacitance measurement or the measurement carried out using rake or the series of temperature in array configuration or thermal resistance sensing device.
There are numerous insoluble problems based on the above conventional liquid level sensor, include but are not limited to: with high costs,
There are security risk, weight is big and measurement result inaccuracy etc..
Summary of the invention
Present invention solves the technical problem that: overcome the deficiencies of the prior art and provide a kind of distribution type fiber-optic level sensing system
System, can not only measure distributed in three dimensions formula tank fill level information, and the reaction time is rapid, and available accurate comprehensive liquid level is surveyed
Measure result.Meanwhile the packaged type relative to energization instrument complexity, the weight of sensor is reduced, electricity liquid level is also eliminated
Device spark ignites the hidden danger that fuel tank causes irremediable disaster.
In order to solve the above-mentioned technical problem, the invention discloses a kind of distribution type fiber-optic liquid level sensor systems, comprising: optical fiber
Liquid level sensor (100), fiber Bragg grating (FBG) demodulator (4) and adhering device (6)；Wherein, fibre optic liquid level sensor (100), comprising:
Optical fiber (2) and at least two long-period fiber grating LPG sensors (5) continuously inscribed of optical fiber axial direction along optical fiber (2)；
Fibre optic liquid level sensor (100) is connect with the output end of fiber Bragg grating (FBG) demodulator (4) by optical fiber；
Fibre optic liquid level sensor (100) is fixed in testing container (1) by adhering device (6), to form array optical
Fine sensing network, and then determined based on arrayed optical fiber sensing network and fiber Bragg grating (FBG) demodulator (4) molten in testing container (1)
The liquid level of liquid (3).
In above-mentioned distribution type fiber-optic liquid level sensor system, the fibre optic liquid level sensor (100) after fixing is formed by battle array
The spacing distance l of column optical fiber sensing network are as follows:
Wherein, d indicates that the internal diameter of testing container (1), n indicate the quantity of long-period fiber grating LPG sensor (5).
In above-mentioned distribution type fiber-optic liquid level sensor system, fiber Bragg grating (FBG) demodulator (4), comprising:
Pulse scan laser, for continuously emitting light pulse to fibre optic liquid level sensor (100), so that optical fiber liquid level passes
Each long-period fiber grating LPG sensor (5) of sensor (100) generates light reflection according to the light pulse；
Receiving module, the reflected light returned for receiving each long-period fiber grating LPG sensor (5)；
Parsing module, the light of the reflected light for being returned according to each long-period fiber grating LPG sensor (5) received
Intensity and central wavelength determine the liquid level of the solution (3) in testing container (1).
In above-mentioned distribution type fiber-optic liquid level sensor system, parsing module is specifically used for:
According to the luminous intensity and central wavelength of the reflected light that each long-period fiber grating LPG sensor (5) returns, determine
Environmental information locating for each long-period fiber grating LPG sensor (5)；
The time that reflected light is returned according to each long-period fiber grating LPG sensor (5), determine each long-period fiber grating
The location of LPG sensor (5) information；
According to determining environmental information and location information, the liquid level of the solution (3) in testing container (1) is determined.
In above-mentioned distribution type fiber-optic liquid level sensor system, parsing module is sensed according to each long-period fiber grating LPG
The luminous intensity and central wavelength for the reflected light that device (5) returns, determine locating for each long-period fiber grating LPG sensor (5)
When environmental information, specifically include:
According to the intensity variation for the reflected light that each long-period fiber grating LPG sensor (5) returns, determine that each optical fiber is long
The light loss of periodic optical grating LPG sensor (5)；
According to the center wavelength variation for the reflected light that each long-period fiber grating LPG sensor (5) returns, each optical fiber is determined
The center wavelength variation trend of long-period gratings LPG sensor (5)；
According to determining light loss and center wavelength variation trend, sensed from least two long-period fiber grating LPG
Screening obtains the long-period fiber grating LPG sensor positioned at solution and air contact surfaces in device (5).
In above-mentioned distribution type fiber-optic liquid level sensor system, pulse scan laser is specifically used for: for each optical fiber long period
Grating LPG sensor (5) provides frequency domain narrow linewidth optical signal；Wherein, the pulsewidth of frequency domain narrow linewidth optical signal is less than 1ns.
In above-mentioned distribution type fiber-optic liquid level sensor system, make between each two long-period fiber grating LPG sensor (5)
It is connected with each other with tandem.
The invention has the following advantages that
(1) distribution type fiber-optic liquid level sensor system of the present invention, mounting process is simple, cheap, and has light
Fine grating sensing element electromagnetism interference, size small (standard bare fibre be 125 μm), it is light-weight, have good temperature tolerance (work
Make temperature upper limit up to 400~600 DEG C), multiplexing capacity is strong, long transmission distance (sensor to demodulating end is up to several kilometers), resistance to
The advantages that burn into high sensitivity, passive device, easy deformation；The future of aerospace field is sent out in the reduction of weight and cost
Exhibition plays a crucial role.
(2) distribution type fiber-optic liquid level sensor system of the present invention, it is possible to provide accurate and safety level gauging, not only
It is applicable in aeronautical field, can more be expanded applied to many medical treatment, industry and pharmaceutical field.
(3) distribution type fiber-optic liquid level sensor system of the present invention, it is possible to provide the real time data of rocket fuel content, in advance
Weak link and potential risk during alert rocket flight are that future aircraft fuel reserve Design of Performance (reduces
Weight etc.) data supporting is provided.In space industry, effective rocket fuel content monitoring technology is to reduce rocket launching investment wind
The key of danger, and optical fiber liquid level sensor-based system technology builds the further design of comprehensive rocket on this basis, transmitting, very
To the links of the life cycles such as recycling, rocket health status can not only be assessed, can more predict that the fuel of rocket in a short time is used
Amount adjusts rocket flight state in time and provides technical support to the Design of Performance of next-generation aircraft, realizes that rocket can
The final goal of sustainable development.
(4) precise measurement and ease for use of distribution type fiber-optic liquid level sensor system of the present invention, so that the distribution
Optical fiber liquid level sensor-based system provides important value for the extensive use that super-low liquid content monitors.It can be in a variety of bulk containers
The interior various industries for carrying out level gauging are difficult to use in the material (such as cryogenic liquid) measured: aerospace, especially
Monitor the liquid fuel of carrier rocket and satellite；Chemistry or oil plant, the fluid flow of monitoring device；For measuring industrial tank body
The liquid level (such as store and transport for liquid natural gas) of middle low temperature or other liquid；The raw material of oil and natural gas industry is deposited
Storage monitoring；Nuclear reactor fuel level monitoring；Food and beverage manufacture；Pharmacy industry；Medical treatment and surgical instrument.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of distribution type fiber-optic liquid level sensor system in the embodiment of the present invention；
Fig. 2 is a kind of diffraction principle schematic diagram that light beam passes through long-period fiber grating in the embodiment of the present invention；
Fig. 3 a is that a kind of light is when by segmentation submergence with the optical fiber of liquid and gas in the embodiment of the present invention, middle cardiac wave
Long offset schematic diagram；
Fig. 3 b is that a kind of light is when by segmentation submergence with the optical fiber of liquid and gas in the embodiment of the present invention, light intensity damage
Consumption variation schematic diagram；
Fig. 4 is a kind of operation principle schematic diagram of fiber Bragg grating (FBG) demodulator in the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to disclosed by the invention
Embodiment is described in further detail.
Referring to Fig.1, a kind of structural schematic diagram of distribution type fiber-optic liquid level sensor system in the embodiment of the present invention is shown.?
In the present embodiment, the distribution type fiber-optic liquid level sensor system, comprising: fibre optic liquid level sensor 100,4 and of fiber Bragg grating (FBG) demodulator
Adhering device 6.Wherein, fibre optic liquid level sensor 100, comprising: optical fiber 2 and the optical fiber axial direction along optical fiber 2 continuously inscribe to
Few two long-period fiber grating LPG sensors 5.
Such as Fig. 1, fibre optic liquid level sensor 100 is connect with the output end of fiber Bragg grating (FBG) demodulator 4 by optical fiber；Optical fiber liquid level
Sensor 100 is fixed in testing container 1 by adhering device 6, to form arrayed optical fiber sensing network, and then is based on array
Formula optical fiber sensing network and fiber Bragg grating (FBG) demodulator 4 determine the liquid level of the solution 3 in testing container 1.
In the preferred embodiment of the present invention, the fibre optic liquid level sensor 100 after fixing is formed by arrayed optical fiber
The spacing distance l of sensing network are as follows:
Wherein, d indicates that the internal diameter of testing container 1, n indicate the quantity of long-period fiber grating LPG sensor 5.
In the preferred embodiment of the present invention, fiber Bragg grating (FBG) demodulator 4 can specifically include: pulse scan laser,
For continuously emitting light pulse to fibre optic liquid level sensor 100, so that each long-period fiber grating of fibre optic liquid level sensor 100
LPG sensor 5 generates light reflection according to the light pulse；Receiving module, for receiving each long-period fiber grating LPG sensor
5 reflected lights returned；Parsing module, the reflected light for being returned according to each long-period fiber grating LPG sensor 5 received
Luminous intensity and central wavelength, determine the liquid level of the solution 3 in testing container 1.
Preferably, parsing module specifically can be used for: the reflection returned according to each long-period fiber grating LPG sensor 5
The luminous intensity and central wavelength of light determine environmental information locating for each long-period fiber grating LPG sensor 5；According to each light
Fine long-period gratings LPG sensor 5 returns to the time of reflected light, determines position locating for each long-period fiber grating LPG sensor 5
Confidence breath；According to determining environmental information and location information, the liquid level of the solution 3 in testing container 1 is determined.
Preferably, parsing module the reflected light returned according to each long-period fiber grating LPG sensor 5 luminous intensity with
And central wavelength specifically includes: when determining environmental information locating for each long-period fiber grating LPG sensor 5 according to each optical fiber
The intensity variation for the reflected light that long-period gratings LPG sensor 5 returns, determines each long-period fiber grating LPG sensor 5
Light loss；According to the center wavelength variation for the reflected light that each long-period fiber grating LPG sensor 5 returns, determine that each optical fiber is long
The center wavelength variation trend of periodic optical grating LPG sensor 5；According to determining light loss and center wavelength variation trend, from
Screening obtains the optical fiber long period light positioned at solution and air contact surfaces at least two long-period fiber grating LPG sensors 5
Grid LPG sensor.
Preferably, pulse scan laser is specifically used for: it is narrow to provide frequency domain for each long-period fiber grating LPG sensor 5
Line width optical signal；Wherein, the pulsewidth of frequency domain narrow linewidth optical signal is less than 1ns.
Preferably, it is connected with each other between each two long-period fiber gratings LPG sensor using tandem.
Distribution type fiber-optic liquid level sensor system of the present invention, using long-period fiber grating LPG sensor diffraction light
The principle that wavelength and intensity are influenced by optical fiber cladding-effective-index establishes ring locating for LPG diffraction light Wavelength strength and grating
The relationship in border, the variation of attribute when passing through LPG by monitoring light beam, point being accurately positioned in fuel tank between liquid and gas
Interface.
Long-period fiber grating LPG sensor establishes a kind of sky using the light sensitive characteristic of fiber optic materials on the fibre core of optical fiber
Between periodic refractive index be distributed, so that light be modified or controlled in the dissemination mode in the region.It is as shown in Figure 2: when light incidence
To after fiber grating, it is diffracted into covering from fiber cores for the light in the wave-length coverage of center in wavelength, the central wavelength of diffraction light can
It indicates are as follows:
λp=(ncl-nco)Λ···(1)
Wherein, nclFor the effective refractive index of fibre cladding, size is influenced by clad material and ambient enviroment；ncoFor
The effective refractive index of fiber core；Λ is the period of fiber grating refractive index modulation, generally several hundred microns.
From formula (1) it can be seen that diffracted wave (namely light loss intensity) that light is generated when passing through grating and in
Cardiac wave length can change with environmental change, therefore, can be with by the transmission loss and center wavelength variation of light in demodulation optical fiber
Accurate Estimation goes out the position of liquid level.As shown in Fig. 3 (a), when LPG is in gas, the central wavelength and LPG diffraction light of light source
Central wavelength difference it is larger, when LPG in a liquid when, the refractive index of liquid is higher than its gas form, LPG diffraction light center wave
It is long mobile to the spectral position of light source.As shown in Fig. 3 (b), light source has low-down transmission loss when passing through LPG.When LPG exists
When in liquid, the refractive index of liquid is higher than its gas form, increases transmission loss when light source passes through LPG, therefore light intensity is damaged
It consumes rate and is greater than liquid level in gas level.
It is further preferred that fiber Bragg grating (FBG) demodulator may be selected based on pulse scan laser and optical time domain reflection technology reality
Existing fiber Bragg grating (FBG) demodulator, highest resolution can achieve 1cm, and realize the monitoring mode of single-ended measurement.As shown in figure 4,
Fiber Bragg grating (FBG) demodulator sends a very short light pulse (< 1ns) to tested optical fiber, then along prolonging after direct impulse
The intensity of slow time domain record reflected light.It can be bent in output from the light of the probe reflection based on fiber Bragg grating (FBG) demodulator different distance
Multiple peak values (1 in Fig. 4,2,3 peak values) is separated by three reflection points in line.
The distribution type fiber-optic liquid level sensor system has used the light based on pulse scan laser and optical time domain reflection technology
Fine grating demodulation instrument monitoring the light intensity loss as caused by optical grating diffraction and central wavelength letter during passing through optical fiber
Breath, accurately demodulates fuel level.
Based on the liquid level sensor system of optical fiber technology with many important excellent in terms of rocket fuel tank level monitoring
Gesture is in particular in:
(1) therefore spark will not be generated by electronic equipment being not used.When using liquid hydrogen or fuel to spray in explosive atmosphere
It penetrates there are when excessive oxygen in tank, this feature enhance the safeties of sensor-based system, reduce maintenance load, and improve operation
Efficiency.
(2) each electronics point sensor needs two copper wire to read, and fibre optical sensor then can be by simple optical fiber
Multiple miniature probes measure liquid level, and optical fiber is four times lighter than copper wire per unit volume at the same time, and intensity is six times high.
(3) fiber optic sensor system neither generates nor vulnerable to electromagnetic interference, therefore, there is no need to shield or insulate, can use
In corrosivity or toxic liquid without damaging fibre optical sensor or pollution testing liquid.
(4) probe based on optical fiber is more much smaller than the probe based on capacitor, and its response can become between different probes
It obtains faster, it is more consistent.
Various embodiments are described in a progressive manner in this explanation, the highlights of each of the examples are with its
The difference of his embodiment, the same or similar parts between the embodiments can be referred to each other.
The above, optimal specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (7)
1. a kind of distribution type fiber-optic liquid level sensor system characterized by comprising fibre optic liquid level sensor (100), fiber grating
(FBG) demodulator (4) and adhering device (6)；Wherein, fibre optic liquid level sensor (100), comprising: optical fiber (2) and along optical fiber (2)
At least two long-period fiber grating LPG sensors (5) that optical fiber axial direction is continuously inscribed；
Fibre optic liquid level sensor (100) is connect with the output end of fiber Bragg grating (FBG) demodulator (4) by optical fiber；
Fibre optic liquid level sensor (100) is fixed in testing container (1) by adhering device (6), to form arrayed optical fiber biography
Feel network, and then determines the solution in testing container (1) based on arrayed optical fiber sensing network and fiber Bragg grating (FBG) demodulator (4)
(3) liquid level.
2. distribution type fiber-optic liquid level sensor system according to claim 1, which is characterized in that the optical fiber liquid level after fixed passes
Sensor (100) is formed by the spacing distance l of arrayed optical fiber sensing network are as follows:
Wherein, d indicates that the internal diameter of testing container (1), n indicate the quantity of long-period fiber grating LPG sensor (5).
3. distribution type fiber-optic liquid level sensor system according to claim 1, which is characterized in that fiber Bragg grating (FBG) demodulator (4),
Include:
Pulse scan laser, for continuously emitting light pulse to fibre optic liquid level sensor (100), so that fibre optic liquid level sensor
(100) each long-period fiber grating LPG sensor (5) generates light reflection according to the light pulse；
Receiving module, the reflected light returned for receiving each long-period fiber grating LPG sensor (5)；
Parsing module, the luminous intensity of the reflected light for being returned according to each long-period fiber grating LPG sensor (5) received
And central wavelength, determine the liquid level of the solution (3) in testing container (1).
4. distribution type fiber-optic liquid level sensor system according to claim 3, which is characterized in that parsing module is specifically used for:
According to the luminous intensity and central wavelength of the reflected light that each long-period fiber grating LPG sensor (5) returns, each light is determined
Environmental information locating for fine long-period gratings LPG sensor (5)；
The time that reflected light is returned according to each long-period fiber grating LPG sensor (5), determine each long-period fiber grating LPG
The location of sensor (5) information；
According to determining environmental information and location information, the liquid level of the solution (3) in testing container (1) is determined.
5. distribution type fiber-optic liquid level sensor system according to claim 4, which is characterized in that parsing module is according to each light
The luminous intensity and central wavelength for the reflected light that fine long-period gratings LPG sensor (5) returns, determine each long-period fiber grating
When environmental information locating for LPG sensor (5), specifically include:
According to the intensity variation for the reflected light that each long-period fiber grating LPG sensor (5) returns, each optical fiber long period is determined
The light loss of grating LPG sensor (5)；
According to the center wavelength variation for the reflected light that each long-period fiber grating LPG sensor (5) returns, each optical fiber long week is determined
The center wavelength variation trend of phase grating LPG sensor (5)；
According to determining light loss and center wavelength variation trend, from least two long-period fiber grating LPG sensors (5)
Middle screening obtains the long-period fiber grating LPG sensor positioned at solution and air contact surfaces.
6. distribution type fiber-optic liquid level sensor system according to claim 3, which is characterized in that pulse scan laser, tool
Body is used for: providing frequency domain narrow linewidth optical signal for each long-period fiber grating LPG sensor (5)；Wherein, frequency domain narrow linewidth light is believed
Number pulsewidth be less than 1ns.
7. distribution type fiber-optic liquid level sensor system according to claim 3, which is characterized in that each two optical fiber long period light
It is connected with each other between grid LPG sensor (5) using tandem.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307362A (en) * | 2020-03-25 | 2020-06-19 | 电子科技大学 | Fiber bragg grating pressure sensor and using method thereof |
| CN111678615A (en) * | 2020-05-19 | 2020-09-18 | 电子科技大学 | Fiber grating liquid level sensor for temperature detection |
| CN112649069A (en) * | 2020-12-15 | 2021-04-13 | 北京航天控制仪器研究所 | Liquid level detection system based on strain optical fiber sensor |
| CN113029427A (en) * | 2021-03-15 | 2021-06-25 | 中国矿业大学 | Mine wind pressure measuring device, mine wind pressure detecting system and mine wind pressure detecting method based on fiber bragg grating |
| CN113137999A (en) * | 2021-05-11 | 2021-07-20 | 武汉理工大学 | Optical fiber Bragg grating array type oil tank liquid level sensing system |
| CN113701853A (en) * | 2021-07-09 | 2021-11-26 | 北京航天控制仪器研究所 | Real-time liquid level measurement and analysis method based on distributed optical fiber liquid level sensor |
| CN114320472A (en) * | 2021-12-31 | 2022-04-12 | 北京景通科信科技有限公司 | Mine flood water level sensing and detecting device |
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| CN111307362A (en) * | 2020-03-25 | 2020-06-19 | 电子科技大学 | Fiber bragg grating pressure sensor and using method thereof |
| CN111678615A (en) * | 2020-05-19 | 2020-09-18 | 电子科技大学 | Fiber grating liquid level sensor for temperature detection |
| CN112649069A (en) * | 2020-12-15 | 2021-04-13 | 北京航天控制仪器研究所 | Liquid level detection system based on strain optical fiber sensor |
| CN112649069B (en) * | 2020-12-15 | 2022-07-29 | 北京航天控制仪器研究所 | Liquid level detection system based on strain optical fiber sensor |
| CN113029427A (en) * | 2021-03-15 | 2021-06-25 | 中国矿业大学 | Mine wind pressure measuring device, mine wind pressure detecting system and mine wind pressure detecting method based on fiber bragg grating |
| CN113029427B (en) * | 2021-03-15 | 2022-03-01 | 中国矿业大学 | Mine wind pressure measuring device, mine wind pressure detecting system and mine wind pressure detecting method based on fiber bragg grating |
| CN113137999A (en) * | 2021-05-11 | 2021-07-20 | 武汉理工大学 | Optical fiber Bragg grating array type oil tank liquid level sensing system |
| CN113701853A (en) * | 2021-07-09 | 2021-11-26 | 北京航天控制仪器研究所 | Real-time liquid level measurement and analysis method based on distributed optical fiber liquid level sensor |
| CN114320472A (en) * | 2021-12-31 | 2022-04-12 | 北京景通科信科技有限公司 | Mine flood water level sensing and detecting device |
| CN114320472B (en) * | 2021-12-31 | 2024-02-09 | 北京景通科信科技有限公司 | Mine flood water level sensing and detecting device |
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