CN112129697B - Distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect - Google Patents
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 203
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 230000001808 coupling effect Effects 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 52
- 238000005253 cladding Methods 0.000 claims abstract description 42
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims description 34
- 238000010168 coupling process Methods 0.000 claims description 34
- 238000005859 coupling reaction Methods 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 5
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 3
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- 230000008859 change Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000013308 plastic optical fiber Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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Abstract
The invention discloses a distributed optical fiber water leakage sensor based on a diode optical fiber side coupling effect, and relates to the field of water leakage sensors. The sensor mainly comprises a light emitting diode optical fiber and a light detection diode optical fiber, wherein the light emitting diode optical fiber and the light detection diode optical fiber are both a combination of a cuboid optical fiber and a lens structure optical fiber cladding; the light emitting diode optical fibers are internally provided with light emitting diodes which are uniformly distributed and connected with each other and are positioned at the corresponding focal points of the lens structure optical fiber cladding; the optical fibers of the light detection diodes are internally provided with light detection diodes which are uniformly distributed and connected with each other and are positioned at the corresponding focal points of the optical fiber cladding of the lens structure; the light emitting diode optical fibers and the light detecting diode optical fibers are arranged in parallel and opposite to each other, the light emitting diode optical fibers and the light detecting diode optical fibers are opposite to each other through the lens structure optical fiber cladding, and the light emitting diodes and the light detecting diodes are opposite to each other correspondingly. The invention can monitor the change of the refractive index in real time and realize high-precision water leakage positioning by a low-cost, simple-structure and all-fiber method.
Description
Technical Field
The invention relates to the field of water leakage sensors, in particular to a distributed optical fiber water leakage sensor based on a diode optical fiber side coupling effect.
Background
The following problems generally exist in the conventional optical fiber distributed sensing technology: (1) a measurement blind area is commonly existed; (2) Only sensitive to stress and temperature change, cannot directly measure the step change of refractive index (water leakage event), needs to take a certain time to convert water leakage into stress or temperature change by means of special materials, and greatly influences the real-time property of measurement; (3) The data analysis processing mechanism is complex, and the measurement instantaneity is also affected. In addition, the positioning precision of the existing liquid leakage sensor is generally larger than +/-0.5 m and is limited by various constraint conditions, and the existing liquid leakage sensor is difficult to achieve large-scale improvement in the prior art.
The existing side coupling structure distributed optical fiber water leakage sensor based on the flexible LED lamp strip and the plastic optical fiber with the side light coupling structure is directly sensitive to refractive index and simple in positioning method, but has the following problems: (1) The existence of the flexible LED lamp strip limits the application of the sensor in an electromagnetic environment; (2) The processing of the side coupling structures (defects, gratings and the like) on the plastic optical fiber not only improves the processing cost of the sensor, but also influences the service life of the sensor.
Based on the two points, a water leakage sensor capable of realizing real-time detection and high-precision positioning of a water leakage event, realizing full optical fiber of the sensor and reducing processing cost and structural complexity needs to be designed.
Disclosure of Invention
The invention provides a distributed optical fiber water leakage sensor based on a diode optical fiber side coupling effect, which aims to solve the problems that the existing water leakage sensor cannot detect in real time, has high processing cost and complex structure and is influenced by service life.
The invention is realized by the following technical scheme: the distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect comprises a light emitting diode optical fiber and a light detection diode optical fiber, wherein the light emitting diode optical fiber and the light detection diode optical fiber are both a combination of a cuboid optical fiber and a lens structure optical fiber cladding, and the cuboid optical fiber and the lens structure optical fiber cladding are made of the same material and are integrally formed; the light-emitting diode optical fibers are internally provided with light-emitting diodes which are uniformly distributed and connected with each other, and the light-emitting diodes are LED light-emitting diodes and are positioned at focuses corresponding to the optical fiber cladding of the lens structure; the optical fiber of the light detection diode is internally provided with light detection diodes which are uniformly distributed and connected with each other, and the light detection diode is a PIN type photodiode and is positioned at a focus corresponding to the optical fiber cladding of the lens structure; the light emitting diode optical fibers and the light detecting diode optical fibers are arranged in parallel and opposite to each other, and are opposite to each other through the optical fiber cladding of the lens structure, the light emitting diodes and the light detecting diodes are opposite to each other correspondingly, the medium between the light emitting diode optical fibers and the light detecting diode optical fibers is a side coupling medium, the distance between the light emitting diode optical fibers and the light detecting diode optical fibers is 0-4 mm, the light emitting diode optical fibers are driven by a laser diode driver, the light detecting diode optical fibers are driven by a driving power supply, and the light detecting diode optical fibers are connected with a photocurrent centralized reading bus.
The distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect is a flexible quasi-distributed water leakage sensor designed based on a newly proposed diode optical fiber, adopts a double-optical-fiber type side coupling structure of a light-emitting diode optical fiber and a light detection diode optical fiber as a water leakage sensitive unit, realizes real-time monitoring and high-precision positioning of a water leakage event by utilizing the principle that the side coupling rate between optical fibers is modulated by the refractive index of a side coupling medium, and improves the water leakage sensitivity of the sensor by utilizing the physical principle of collimation and focusing of a lens structure optical fiber cladding. In the invention, light emitted by an LED in the light-emitting diode optical fiber is coupled into a PIN photodiode in the light-detecting diode optical fiber through an optical fiber cladding and a side coupling medium, so that the optical coupling between the diode optical fibers is realized, and when the positions between the light-emitting diode optical fiber and the light-detecting diode optical fiber are fixed, the side coupling rate between the two optical fibers can change along with the change of the refractive index of the side coupling medium; when a water leakage event occurs, the side coupling medium is changed into water from air, the refractive index is changed, the side coupling rate between the diode optical fibers is changed, accordingly, the light intensity received by the PIN photodiode in the photo-detection diode optical fiber is changed, and the photocurrent obtained by reading the bus in the photocurrent centralized mode at the receiving end of the optical fiber is also changed, which is the water leakage sensitive mechanism of the side coupling structure of the diode optical fiber. Based on the principle, the distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect mainly comprises a light emitting diode optical fiber and a light detecting diode optical fiber, wherein the light emitting diode optical fiber and the light detecting diode optical fiber are both a combination of a cuboid optical fiber and a lens structure optical fiber cladding, and the cuboid optical fiber and the lens structure optical fiber cladding are made of the same material and are integrally formed; the optical fiber cladding is designed into a lens structure, so that a focus is needed, an external light source can be focused through the lens, and light emitted by an LED can be collimated; the light emitting diodes are uniformly distributed and connected with each other in the light emitting diode optical fiber, and the light emitting diodes are arranged at the focus of the lens structure optical fiber cladding, so that the light is collimated and focused between the light emitting and light detecting optical fibers; in order to increase the side coupling ratio, a diode should be placed at the focal point of the lens according to the physical principle of the lens to focus the external light source and collimate the light emitted from the LED in the fiber; similarly, the optical fibers of the light detection diodes are also internally provided with uniformly distributed and mutually connected light detection diodes, the light detection diodes are PIN-type light detection diodes, and the light detection diodes are arranged at the focal points corresponding to the optical fiber cladding of the lens structure; in order to finish water leakage detection, the light emitting diode optical fibers and the light detecting diode optical fibers are arranged and fixed in parallel and opposite to each other, and the optical fiber cladding of the lens structure is opposite to each other, and the light emitting diodes and the light detecting diodes are opposite to each other, so that each light emitting diode and the corresponding light detecting diode form a water leakage sensitive unit, the light detecting diode converts detected light into current and collects the intensity of photocurrent through a current detecting tool, the distance between the light emitting diode optical fibers and the light detecting diode optical fibers is 0-4 mm, when no water leakage occurs, the side coupling medium between the light emitting diode optical fibers and the light detecting diode optical fibers is air, when water leakage occurs, the side coupling medium of the water leakage point is changed into water, the refractive index is changed, and the photocurrent detected by the light detecting diode is changed; the light emitting diode optical fiber is driven by the laser diode driver, the light detecting diode optical fiber is connected with the driving power supply, the driving power supply is used for supplying power, the light detecting diode optical fiber is also connected with the photocurrent centralized reading bus, and the photocurrent centralized reading bus is used for reading the magnitude of photocurrent converted by the light detecting diode and detecting the water leakage condition and the position of the water leakage point according to the pulse change of the photocurrent.
The water leakage detection method of the distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect comprises the following steps:
1) The light emitting diode optical fiber and the lens structure optical fiber cladding of the light detection diode optical fiber are arranged oppositely, the distance between the light emitting diode optical fiber and the light detection diode optical fiber is controlled to be 0-4 mm, the light emitting diodes and the light detection diodes are correspondingly opposite to each other, each light emitting diode and the corresponding light detection diode form a water leakage sensitive unit, after the power is applied, the light emitting diodes in the light emitting diode optical fiber sequentially lighten one by one, light is emitted from the lens structure optical fiber cladding in parallel and is coupled into the light detection diode optical fiber, the light detection diodes in the light detection diode optical fiber detect light, the light current centralized reading bus receives a series of orderly light current pulses, the light emitting diodes scan one by one and correspond to the light current pulses one by one, and each water leakage sensitive unit also corresponds to the light current pulses one by one;
2) And (3) reading a pulse sequence of the photocurrent centralized reading bus, and simultaneously combining a scanning time sequence of the light emitting diode to analyze: when a water leakage event occurs and flows into one or more water leakage sensitive units, the lateral coupling medium of the corresponding water leakage sensitive unit changes suddenly from air to water, when the light emitting diode of the water leakage point emits light, the light received by the light detecting diode changes suddenly, the output of the photocurrent pulse corresponding to the corresponding water leakage sensitive unit changes suddenly, and the photocurrent pulse of the water leakage point is measured in real time by using the photocurrent centralized reading bus; when the water leakage sensitive unit is in no water, the coupling light is collimated and focused by the optical fiber cladding of the lens structure and irradiates onto the photo-detection diode arranged at the focal point of the lens, the photo-current centralized reading bus can detect the photo-current to be the detectable maximum value, when the water leakage sensitive unit detects the water leakage, only a part of side coupling light irradiates onto the photo-detection diode, the photo-current of the water leakage sensitive unit is greatly reduced, and finally, the photo-current centralized reading bus is combined with the scanning time sequence of the light-emitting diode to determine the occurrence and the accurate position of the occurrence of the water leakage event.
Preferably, the optical fiber cladding of the lens structure is a semi-cylindrical optical fiber cladding which acts as a lens and extends along the entire length of the optical fiber at one side of the optical fiber.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect, which firstly provides a double-optical-fiber side coupling structure of a light-emitting diode optical fiber and a light detection diode optical fiber as a water leakage sensitive unit, and realizes real-time monitoring and high-precision positioning of a water leakage event by utilizing the principle that the side coupling rate between the optical fibers is modulated by the refractive index of a side coupling medium; the positioning accuracy is related to the position distribution of the diodes in the optical fibers, the positioning method is simpler, the cost is lower, and the water leakage sensitivity of the sensor is improved by utilizing the physical principle of the lens. Compared with a distributed water leakage sensor based on positioning of an external source of a flexible LED lamp strip, the technology realizes full optical fiber, and can be applied to occasions requiring immune electromagnetic interference; the technology does not need to process an optical coupling structure on the side surface of the optical fiber, reduces the processing cost, simplifies the structure of the whole system and prolongs the service life of the sensor. The sensor not only ensures that the whole sensing system has the advantages of electromagnetic interference resistance, simple structure and the like, but also can meet the detection requirement of random arrangement in a complex space structure; the method can be applied to water leakage detection in the industries of communication, post and telecommunications, financial systems, libraries, museums, archives, airports, oil reservoirs, petroleum, petrochemical industry, pharmaceutical industry and the like in the future.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a light path diagram of the light emitting diode and the light detecting diode of the present invention.
FIG. 3 is a graph showing the comparison of the light paths of the present invention without water leakage and with water leakage.
FIG. 4 is a schematic diagram showing the comparison of the water leakage point optical paths in an embodiment of the present invention.
FIG. 5 is a graph showing a photocurrent pulse train output by the photocurrent centralized read bus when no water leak occurs in an embodiment of the present invention.
FIG. 6 is a diagram of a photocurrent pulse train output by a photocurrent centralized read bus when a water leak event occurs in an embodiment of the present invention.
The figures are labeled as follows: the device comprises a 1-light emitting diode optical fiber, a 2-light detection diode optical fiber, a 3-light emitting diode, a 4-light detection diode, a 5-side coupling medium, a 6-photocurrent centralized reading bus, a 7-laser diode driver and an 8-driving power supply.
Detailed Description
The invention is further illustrated below with reference to specific examples.
A distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect, as shown in fig. 1: the LED optical fiber comprises an LED optical fiber 1 and a light detection diode optical fiber 2, wherein the LED optical fiber 1 and the light detection diode optical fiber 2 are both a combination of a cuboid optical fiber and a lens structure optical fiber cladding, and the cuboid optical fiber and the lens structure optical fiber cladding are made of the same material and are integrally formed; the light-emitting diode optical fiber 1 is internally provided with light-emitting diodes 3 which are uniformly distributed and connected with each other, and the light-emitting diodes 3 are LED light-emitting diodes and are positioned at focuses corresponding to the optical fiber cladding of the lens structure; the optical fiber 2 is internally provided with evenly distributed and mutually connected photo-detection diodes 4, and the photo-detection diodes 4 are PIN-type photodiodes and are positioned at focuses corresponding to the optical fiber cladding of the lens structure; the light emitting diode optical fiber 1 and the light detecting diode optical fiber 2 are arranged in parallel and opposite to each other, and are opposite to each other through the optical fiber cladding of the lens structure, the light emitting diode 3 and the light detecting diode 4 are also opposite to each other correspondingly, and the medium between the light emitting diode optical fiber 1 and the light detecting diode optical fiber 2 is a side coupling medium 5, and the distance is 0-4 mm; the light emitting diode optical fiber 1 is driven by a laser diode driver 7, the light detecting diode optical fiber 2 is driven by a driving power supply 8, and the light detecting diode optical fiber 2 is also connected with a photocurrent centralized reading bus 6.
The optical fiber cladding with the lens structure in the embodiment is a semi-cylindrical optical fiber cladding.
In this embodiment, 6 water leakage sensing units, S1 to S6 respectively, are disposed between the light emitting diode optical fiber and the light detecting diode optical fiber to perform water leakage detection, as shown in fig. 4. The schematic diagram of the light path when the side coupling medium is air is shown in fig. 2; in fig. 3, the light path diagram (a) when water is not leaked is shown, and the light path diagram (b) when water is leaked is shown.
The water leakage detection method of the distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect of the embodiment comprises the following steps:
1) The lens structure optical fiber cladding of the light emitting diode optical fiber 1 and the light detecting diode optical fiber 2 are arranged oppositely, the distance between the light emitting diode optical fiber 1 and the light detecting diode optical fiber 2 is controlled to be 0-4 mm, the light emitting diodes 3 and the light detecting diodes 4 are correspondingly opposite to each other, each light emitting diode 3 and the corresponding light detecting diode 4 form a water leakage sensitive unit, after the power is applied, the light emitting diodes 3 in the light emitting diode optical fiber 1 sequentially lighten one by one, light is emitted from the lens structure optical fiber cladding in parallel and is coupled into the light detecting diode optical fiber 2, the light detecting diode 4 in the light detecting diode optical fiber 2 detects light, a series of orderly photocurrent pulses are received by the photocurrent centralized reading bus 6, the light emitting diodes 3 are scanned one by one, and correspond to the photocurrent pulses one by one, and each water leakage sensitive unit corresponds to the photocurrent pulses one;
2) The pulse sequence of the reading photocurrent centralized reading bus 6 is read, and simultaneously, the scanning time sequence of the light emitting diode 3 is combined for analysis: when a water leakage event occurs and flows into one or more water leakage sensitive units, the side coupling medium 5 of the corresponding water leakage sensitive unit changes suddenly from air to water, when the light-emitting diode 3 of the water leakage point emits light, the light received by the light detection diode 4 changes suddenly, the output of the photocurrent pulse corresponding to the corresponding water leakage sensitive unit changes suddenly, and the photocurrent pulse of the water leakage point is measured in real time by utilizing the photocurrent centralized reading bus 6; when the water leakage sensing unit is in no water, the coupling light is collimated and focused by the optical fiber cladding of the lens structure and irradiates onto the light detection diode 4 arranged at the focal point of the lens, the photocurrent can be detected by the photocurrent centralized reading bus 6 to be the maximum value which can be detected, when the water leakage sensing unit detects water leakage, only a part of side coupling light irradiates onto the light detection diode 4, the photocurrent of the water leakage sensing unit is greatly reduced by the photocurrent centralized reading bus 6, and finally, the light detection device is combined with the scanning time sequence of the light emitting diode 3 to determine the occurrence and the accurate position of the occurrence of the water leakage event.
In this embodiment, the photocurrent centralized reading bus 6 is used to detect the photocurrent pulses converted by the photo-detection diode 4, as shown in fig. 5, after the LEDs in the LED optical fiber are scanned sequentially, the photo-detection diode optical fiber end receives a series of orderly photocurrent pulses, where the series of photocurrent pulses are equal and are the maximum value of the detectable light; when a water leakage event occurs, as shown in fig. 6, when water leakage occurs at the water leakage sensitive unit corresponding to S2, the photocurrent output by the light detection diode of the water leakage sensitive unit is suddenly changed and becomes smaller. The LED light emitting diodes in the water leakage sensitive units are scanned one by one and correspond to the photocurrent pulses one by one, so that the point positions of the water leakage sensitive units correspond to the photocurrent pulses one by one, the information of occurrence of water leakage events is obtained, and the positions of the water leakage points are also obtained.
The scope of the present invention is not limited to the above embodiments, and various modifications and alterations of the present invention will become apparent to those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. The utility model provides a distributed optical fiber sensor that leaks based on diode optic fibre side coupling effect which characterized in that: the optical fiber comprises a light emitting diode optical fiber (1) and a light detection diode optical fiber (2), wherein the light emitting diode optical fiber (1) and the light detection diode optical fiber (2) are both a combination of a cuboid optical fiber and a lens structure optical fiber cladding, and the cuboid optical fiber and the lens structure optical fiber cladding are made of the same material and are integrally formed; the light emitting diode optical fiber (1) is internally provided with light emitting diodes (3) which are uniformly distributed and connected with each other, and the light emitting diodes (3) are positioned at the focus corresponding to the optical fiber cladding of the lens structure; the optical fiber (2) is internally provided with evenly distributed and mutually connected light detection diodes (4), and the light detection diodes (4) are PIN type photodiodes and are positioned at focuses corresponding to the optical fiber cladding of the lens structure; the light emitting diode optical fibers (1) and the light detecting diode optical fibers (2) are arranged in parallel and opposite to each other, and are opposite to each other through optical fiber cladding of a lens structure, the light emitting diodes (3) and the light detecting diodes (4) are also opposite to each other correspondingly, a medium between the light emitting diode optical fibers (1) and the light detecting diode optical fibers (2) is a side coupling medium (5), and the distance between the light emitting diode optical fibers (1) and the light detecting diode optical fibers (2) is 0-4 mm;
the light emitting diode optical fiber (1) is driven by a laser diode driver (7), the light detecting diode optical fiber (2) is driven by a driving power supply (8), and the light detecting diode optical fiber (2) is also connected with a photocurrent centralized reading bus (6).
2. The distributed optical fiber water leakage sensor based on diode optical fiber side coupling effect as claimed in claim 1, wherein: the lens structure fiber cladding is a semi-cylindrical fiber cladding which acts as a lens and extends along the entire length of the fiber on one side of the fiber.
3. The water leakage detection method of the distributed optical fiber water leakage sensor based on the diode optical fiber side coupling effect of claim 1, which is characterized in that: the method comprises the following steps:
1) the lens structure optical fiber cladding of the light emitting diode optical fiber (1) and the light detecting diode optical fiber (2) are arranged oppositely, the distance between the light emitting diode optical fiber (1) and the light detecting diode optical fiber (2) is controlled to be 0-4 mm, the light emitting diodes (3) and the light detecting diodes (4) are correspondingly opposite to each other, each light emitting diode (3) and the corresponding light detecting diode (4) form a water leakage sensitive unit, after the light emitting diode optical fiber (1) is electrified, the light emitting diodes (3) orderly light one by one, light is emitted out of the lens structure optical fiber cladding in parallel and is coupled into the light detecting diode optical fiber (2), the light detecting diodes (4) in the light detecting diode optical fiber (2) detect light, a series of orderly light current pulses are received by the centralized reading bus (6), the light emitting diodes (3) are scanned one by one and correspond to the light current pulses one by one, and each water leakage sensitive unit corresponds to the light current pulses one by one;
2) And (3) reading a pulse sequence of the photocurrent centralized reading bus (6), and simultaneously carrying out analysis by combining with a scanning time sequence of the light emitting diode (3): when a water leakage event occurs and flows into one or more water leakage sensitive units, the side coupling medium (5) of the corresponding water leakage sensitive unit changes suddenly from air to water, when the light emitting diode (3) of the water leakage point emits light, the light received by the light detecting diode (4) changes suddenly, the output of the photocurrent pulse corresponding to the corresponding water leakage sensitive unit changes suddenly, and the photocurrent pulse of the water leakage point is measured in real time by utilizing the photocurrent centralized reading bus (6); when the water leakage sensitive unit is in no water, the coupling light is collimated and focused by the optical fiber cladding of the lens structure and irradiates onto the photo detection diode (4) arranged at the lens focus, the photo current centralized reading bus (6) can detect the photo current to be the detectable maximum value, when the water leakage sensitive unit detects the water leakage, only a part of side coupling light irradiates onto the photo detection diode (4), the photo current centralized reading bus (6) detects that the photo current of the water leakage sensitive unit is greatly reduced, and finally, the photo current centralized reading bus is combined with the scanning time sequence of the light emitting diode (3) to determine the occurrence and the accurate position of the occurrence of the water leakage event.
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