CN106769882B - Oil spilling monitor and monitoring method thereof - Google Patents
Oil spilling monitor and monitoring method thereof Download PDFInfo
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- CN106769882B CN106769882B CN201611232149.8A CN201611232149A CN106769882B CN 106769882 B CN106769882 B CN 106769882B CN 201611232149 A CN201611232149 A CN 201611232149A CN 106769882 B CN106769882 B CN 106769882B
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- G—PHYSICS
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Abstract
The invention discloses an oil spilling monitor and a monitoring method thereof. The oil spilling monitor includes: a light source device configured to send a first band optical signal to a target area to be detected to form a second band optical signal in the target area; a photodetector configured to photoelectrically convert the received optical signal of the second wavelength band to obtain a detection electric signal; a processor configured to determine whether oil spill occurs according to the detection electric signal; an alarm configured to generate an alarm signal. The invention adopts the light source device of the pulse ultraviolet light source, which not only reduces the power, but also is convenient for measuring the background value of the sea surface, judges whether oil spilling or not and eliminates the situation of false alarm by using the method of combining threshold value analysis and background comparison, improves the monitoring efficiency and accuracy, can eliminate main interference by adopting the double-optical filter arrangement, and reduces the background light so as to improve the signal to noise ratio.
Description
Technical Field
The invention belongs to the technical field of oil spilling monitoring, and particularly relates to an oil spilling monitor and a monitoring method thereof.
Background
With the rapid development of industrial construction, the dependence of each country on petroleum is getting larger and larger, and while the petroleum yield and the transportation volume are continuously increased, oil spill accidents also frequently occur, so that enterprise units related to petroleum production and transportation face huge pressure. The oil spill accident not only brings economic loss to enterprises, but also causes huge disasters to the environment and the society, and if people can find and process the oil spill source in time at the initial stage of oil spill, the loss and the pollution suffered by people can be greatly reduced. Therefore, a system capable of monitoring the oil spill condition in real time and sending out an alarm signal is needed. The existing satellite monitoring has low accuracy for monitoring small-range pollution, radar remote monitoring has low accuracy, high cost, no real-time performance and the like, in addition, some contact detectors need to be maintained regularly to avoid the fault of the detectors, the detectors generally need to be sampled manually and brought back to a laboratory for detection, the oil spill condition on the sea surface can not be monitored in real time in all weather, and the required labor cost is higher.
Therefore, there is a need in the art for improvements and developments.
Disclosure of Invention
In order to solve the problems in the prior art, the present invention aims to provide an oil spill monitor and a monitoring method thereof, which have the advantages of low cost, high real-time performance and extremely low false alarm rate.
The invention provides an oil spilling monitoring method, which comprises the following steps:
s1, in a first sampling period, sending a first waveband light signal to a target area which is not irradiated by an ultraviolet light source to obtain a first background value;
s2, in a second sampling period, sending the first waveband light signal to a target area which is not irradiated by the ultraviolet light source to obtain a second background value, and sending the first waveband light signal to the target area which is irradiated by the ultraviolet light source to obtain a first signal value;
s3, performing difference operation according to the second background value and the first signal value to obtain a first signal difference value corresponding to a second sampling period;
s4, comparing whether the first signal difference is larger than a lower limit threshold and smaller than an upper limit threshold, wherein the upper limit threshold is configured to be the signal difference of pure oil obtained by laboratory test, and the lower limit threshold is configured to be a value which is 30-50% higher than the measured sea surface signal difference under the condition of no oil spill or other impurities; if yes, go to step S6; if not, no alarm is given;
s5, calculating the actual ratio of the second background value to the first background value, and determining whether the actual ratio is smaller than the reference ratio, wherein the reference ratio is configured as a reference constant, if yes, executing the step S6; if not, no alarm is given;
s6, after time delay, continuing to execute the step S7;
s7, detecting to obtain a delayed third background value and a delayed second signal value, and calculating to obtain a delayed second signal difference value;
s8, comparing whether the second signal difference value is larger than the lower threshold and smaller than the upper threshold; if yes, alarming; if not, no alarm is given.
Further, step S1 includes: transmitting a first waveband light signal to a target area which is not irradiated by an ultraviolet light source in a first sampling period so as to form a first light signal in the target area; the first optical signal is photoelectrically converted to obtain a first background value.
Further, step S3 includes: in a second sampling period, sending the first waveband optical signal to a target area which is not irradiated by the ultraviolet light source so as to form a second optical signal in the target area; performing photoelectric conversion on the second optical signal to obtain a second background value; sending a first band optical signal to a target area irradiated by an ultraviolet light source to form a third optical signal in the target area; and performing photoelectric conversion on the third optical signal to obtain a first signal value.
Further, the oil spill detection method further comprises:
condensing the transmitted optical signal to obtain an optical signal with high light intensity;
filtering the condensed optical signal to obtain a first waveband optical signal;
reflecting the first band optical signal by using a reflector;
and focusing the reflected first waveband optical signal to a target area.
Further, the oil spill monitoring method further comprises: and when alarming, photographing the target area to obtain a picture of the target area, and sending the picture to the detection terminal.
Further, the oil spill detection method further comprises: and measuring the height value of the sea level, and adjusting the upper limit threshold value and the lower limit threshold value according to the height value.
The invention also provides an all-weather non-contact type oil spilling detector, which is used for monitoring oil spilling by the oil spilling monitoring method, and comprises the following steps: a light source device configured to send a first band optical signal to a target area to be detected to form a second band optical signal in the target area; a photodetector configured to photoelectrically convert the received optical signal of the second wavelength band to obtain a detection electric signal; a processor configured to determine whether oil spill occurs according to the detection electric signal; an alarm configured to generate an alarm signal.
Further, the oil spilling monitor still includes communication module, the alarm is still constructed and is produced alarm information, the alarm passes through communication module sends alarm information to monitor terminal.
Further, the light source device includes: an LED lamp; the light gathering piece is arranged opposite to the LED lamp; the narrow-band filter is arranged on one side, back to the LED lamp, of the light gathering piece; the light filtering component is arranged on the light incident surface of the photoelectric detector; the narrow-band filter is arranged between the narrow-band filter and the filtering component, and the normal direction of the reflector forms an angle of 45 degrees with the filtering component; the convex lens is arranged on one side of the reflector opposite to the photoelectric detector and used for focusing light; wherein, photoelectric detector, the filtering subassembly the speculum with convex lens arranges in proper order and sets up and aligns on the first direction, the LED lamp the spotlight piece narrowband filter with the speculum is arranged in proper order and is set up and align on the second direction, first direction perpendicular to the second direction.
Further, the oil spill monitor further comprises a visible light photographing device, and the processor is further configured to control the visible light photographing device to photograph after receiving the alarm information.
Further, the oil spill monitor further comprises a distance measuring device connected to the processor, the distance measuring device being configured to measure a height of sea level, the processor being further configured to adjust a parameter value of the processor based on the height measured by the distance measuring device.
The invention has the beneficial effects that:
the oil spilling monitor and the monitoring method thereof of the invention use the pulse ultraviolet light source, thereby not only reducing the power, but also being convenient for measuring the background value of the sea surface, judging whether oil spilling occurs or not and eliminating the situation of false alarm by combining the threshold analysis and the background comparison, eliminating the main interference by adopting the double-optical filter arrangement, reducing the background light and improving the signal to noise ratio. The invention further reduces false alarm and saves manpower by arranging the visible light camera, eliminates the influence of sea water height change on monitoring by adding the distance measuring device, reduces the size of the oil spilling monitor by adopting a coaxial light path system, and is convenient for adding the shading cylinder to improve the signal-to-noise ratio.
Drawings
The above and other aspects, features and advantages of embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram of an oil spill monitor according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a light source device according to a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a method for monitoring oil spill according to a preferred embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application so that others skilled in the art will be able to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated. Like reference numerals may be used to refer to like elements throughout the specification and drawings.
FIG. 1 is a block diagram of an oil spill monitor according to a preferred embodiment of the present invention.
Referring to fig. 1, an oil spill monitor according to an embodiment of the present invention includes: the system comprises a light source device 10, a photoelectric detector 20, a processor 30, an alarm 40, a communication module 50, a visible light photographing device 60, a distance measuring device 70 and a time delay module 80.
The light source device 10 is configured to send a first band optical signal to a target area to be detected to form a second band optical signal in the target area. The light source device 10 is specifically a pulsed ultraviolet light source device 10, and can emit an ultraviolet pulse signal at a certain frequency. The pulse ultraviolet light source device 10 reduces the overall power consumption on one hand, and is convenient for measuring the background value and reducing the background noise on the other hand. The first waveband optical signal is specifically ultraviolet light with a waveband of 300-400 nm. The second wave band optical signal is ultraviolet light with wave band of 400 nm-550 nm.
Fig. 2 is a schematic structural diagram of a light source device according to a preferred embodiment of the invention.
Referring to fig. 2, the light source device 10 includes an LED lamp 11, a light collector 12, a narrow band filter 13, a reflector 14, a light shielding cylinder 15, a convex lens 16, and a filter assembly 17. The light source device 10 adopts a coaxial light path design structure.
Specifically, the LED lamp 11 is specifically an ultraviolet LED lamp 11, and is capable of generating pulsed ultraviolet light, and further capable of emitting narrow-band LED light with a peak of 365 nm. The LED lamp 11 is disposed at a position obliquely below the photodetector 20.
The light-gathering member 12 is disposed opposite to the LED lamp 11, and is configured to gather light emitted by the LED lamp 11. In the present embodiment, the light-collecting member 12 is preferably a light-collecting cup, but the present invention is not limited thereto.
The narrow band filter 13 is disposed on a side of the light gathering member 12 opposite to the LED lamp 11, that is, the light gathering member 12 is disposed between the LED lamp 11 and the narrow band filter 13. In this embodiment, the band pass filter is preferably a 365nm narrow band filter 13 for passing 365nm narrow band LED light.
The filtering component 17 is disposed at an outer side of the photodetector 20, and is specifically disposed opposite to the light incident surface of the photodetector 20, for further filtering the second waveband optical signal returned from the target region, so as to improve the determination accuracy of the processor 30. Specifically, the filter assembly 17 includes a band pass filter with a bandwidth of 400nm to 550nm, and a band stop filter with a bandwidth of 420nm to 500 nm. The band-pass filter and the band-stop filter are oppositely and adjacently arranged. Although the invention is not so limited. For phytoplankton in the main false alarm condition in seawater, the leaves of the phytoplankton contain pigments such as chlorophyll, and the pigments can generate fluorescence under a certain wavelength (including a light source wave band and sunlight), so that the monitoring result of an oil spill monitor is influenced. To address this portion of the interference, embodiments of the present invention provide for the placement of a filter assembly 17 on the photodetector 20. Because the fluorescence spectrum of oil is wide and the fluorescence spectrum of phytoplankton such as algae is mainly concentrated in a narrow band of about 450nm, the fluorescence of the phytoplankton can be blocked, and the misinformation of a monitor caused by the phytoplankton is eliminated to a great extent. Meanwhile, because the sea surface has stronger reflection to the blue-violet light, the filtering component 17 can also block the blue-violet light from the background to a certain extent, so that the background light is greatly weakened, and the signal-to-noise ratio is improved to a certain extent.
In order to make the emergent light and the incident light on the same axis, in the embodiment of the present invention, a reflector 14 with an inclination angle of 45 ° is disposed between the light source device 10 and the photodetector 20, or between the narrowband filter 13 and the filter assembly 17, so that not only the size of the detector in the horizontal direction is relatively small, but also a relatively long shading cylinder 15 is conveniently disposed in the vertical direction, thereby blocking sunlight and avoiding the influence of sunlight irradiation. The reflecting mirror 14 and the shading cylinder 15 are combined with the filter plate, so that the signal to noise ratio is improved to a great extent. In particular, the mirror 14 is preferably a dichroic mirror. Dichroic mirrors are capable of almost complete transmission of light at certain wavelengths and almost complete reflection of light at other wavelengths. In the present embodiment, the dichroic mirror allows light having a wavelength of 409nm or more to pass through, while totally reflecting light having a wavelength of 409nm or less. The invention is not so limited.
The convex lens 16 is disposed on a side of the reflector 14 opposite to the photodetector 20. The convex lens 16 is a large-aperture convex lens with a focal length equal to the distance between the lens and the photodiode and used for receiving light. The convex lens 16 can well converge the fluorescence emitted from the target area, so that the fluorescence is converged on the end face of the photoelectric detector 20. In the present embodiment, the convex lens 16 is embodied as a plano-convex mirror, but the present invention is not limited thereto.
The photoelectric detector 20, the filter assembly 17, the 45-degree reflector 14 and the convex lens 16 are sequentially arranged and aligned in the first direction. The LED lamp 11, the light gathering piece 12, the narrow band filter 13 and the reflector 14 arranged at 45 degrees are sequentially arranged and aligned in the second direction. The first direction is perpendicular to the second direction.
Specifically, a first wavelength band optical signal (365nm optical signal) emitted by the LED lamp 11 sequentially passes through the light gathering part 12 and the filter, the first wavelength band optical signal is focused to a target region through the convex lens 16 under the reflection action of the reflector 14, the target region returns a second wavelength band optical signal, and the second wavelength band optical signal sequentially passes through the scattering of the convex lens 16 and sequentially passes through the reflector 14 and the filter assembly 17 to reach the photodetector 20.
With continued reference to fig. 1, the photodetector 20 is configured to photoelectrically convert the received optical signal in the second wavelength band to obtain a detected electrical signal. The photo detector 20 may be selected from a photodiode, a photomultiplier, and the like, depending on the sensitivity requirements. Different detectors can work at different distances and have positive correlation with sensitivity. Can be changed and selected according to actual requirements. Specifically, in the present embodiment, the photodiode is a square planar packaged photodiode. The invention is not so limited.
The alarm 40 is used for generating an alarm signal and alarm information.
A processor 30 configured to determine whether oil spill occurs according to the detection electric signal; after receiving the alarm information, controlling the visible light photographing device 60 to photograph; the value of the parameter of the processor 30 is adjusted according to the height measured by said distance measuring device 70.
The distance measuring device 70 is used to measure the height of the sea level. In this embodiment, the distance measuring device 70 is arranged to avoid the influence of sea level height change on the measurement, and the light intensity detected by the detector is naturally different at different heights, so that the upper threshold and the lower threshold of the processor 30 are adjusted in real time according to the sea level height, and the accuracy and the sensitivity of the oil spill monitor are improved to a certain extent.
The visible light photographing device 60 is used for photographing the sea surface under the control of the processor 30. Since the false alarm is inevitable in the oil spill monitoring, in order to further reduce the false alarm through manual work, the visible light photographing device 60 is additionally arranged in the embodiment, and only when the oil spill alarm occurs in the alarm device, the visible light photographing device is started under the control of the processor 30, and the photographed image is transmitted to the monitoring terminal through the communication module 50. And the visible light photographing device 60 is not started under other conditions, so that the low power consumption of the monitor is ensured. The detection personnel can simply eliminate a part of false alarms through the approximate picture and close the alarm through the terminal. Therefore, the site investigation is not needed every time, and a large amount of labor and time cost are saved. If the oil spill does occur, the detection personnel can simply judge the approximate oil spill situation through the picture of the camera, so that the preliminary treatment can be timely carried out.
The delay module 80 is used to provide a delay function for the monitor.
The working process of the oil spilling monitor is as follows: the light source device 10 emits ultraviolet light, a first waveband light signal with a waveband of 300-400 nm is emitted to a target area through the convex lens 16, if oil spilling occurs, a second waveband light signal with a waveband of 400-550 nm is returned to the photoelectric detector 20, the photoelectric detector 20 converts the second waveband light signal into a detection electric signal, and the detection electric signal is transmitted to the processor 30. The processor 30 judges whether oil spilling occurs or not by combining with an algorithm of threshold analysis and background comparison, if oil spilling occurs, the alarm 40 is controlled to generate an alarm signal and alarm information, and the alarm 40 sends the alarm information to a monitoring terminal or a mobile phone of a monitoring person through the communication module 50 to remind people of processing as soon as possible. Meanwhile, the processor 30 is further configured to control the visible light photographing device 60 to photograph after receiving the alarm information, and the visible light photographing device 60 transmits the photographed picture to the monitoring terminal through the communication module 50.
Since the seawater includes not only seawater or oil spill but also many other substances, it is also an important issue to eliminate false alarm caused by other substances. The embodiment of the invention also provides an oil spilling monitoring method combining threshold analysis and background comparison, and the oil spilling monitor adopts the oil spilling monitoring method to solve the problem.
It should be noted that only a background comparison method is used to monitor oil spill, which has a disadvantage: at cloudy day or evening, the background light is very weak or not, just can't use the background comparison method to detect the oil spilling at this time, for solving this shortcoming, the monitor of this application embodiment can add a sensitization LED lamp in instrument shell part, the sensitization LED lamp is used for acting as the background light source when night or low light illumination to make the background comparison of monitor can normally go on, reduce the false alarm rate.
In addition, sometimes the sea surface below the oil spill monitor only floats over a small group of floating oil, and may be accidentally dropped and is not oil spill, and then the alarm 40 does not need to be started to alarm. To solve this problem, the delay module 80 of the embodiment of the present invention provides a delay function, for example, a delay time T is set, and if the alarm condition is still met after the delay time Ts, an alarm is finally generated.
The threshold analysis and background comparison method is combined to judge whether oil spilling occurs according to the detection electric signal.
FIG. 3 is a flow chart of a method for monitoring oil spill according to a preferred embodiment of the present invention. Referring to fig. 3, an oil spill monitoring method according to an embodiment of the present invention includes:
in step 210, in a first sampling period, a first band optical signal is transmitted to a target area not illuminated by the ultraviolet light source to obtain a first background value.
Specifically, step 210 includes:
transmitting a first waveband light signal to a target area which is not irradiated by an ultraviolet light source in a first sampling period so as to form a first light signal in the target area; the first optical signal is photoelectrically converted to obtain a first background value. Specifically, a first wavelength band optical signal is transmitted to a target area not irradiated by the ultraviolet light source by the light source device 10 to form a first optical signal in the target area, and the first optical signal is subjected to photoelectric conversion by the photoelectric detector 20 to obtain a first background value.
In step 220, in a second sampling period, the first band optical signal is sent to the target area not irradiated by the uv light source to obtain a second background value, and the first band optical signal is sent to the target area irradiated by the uv light source to obtain a first signal value. The first sampling period and the second sampling period are two continuous sampling periods of the oil spill monitor in the monitoring process.
Specifically, step 220 includes:
in a second sampling period, sending the first waveband optical signal to a target area which is not irradiated by the ultraviolet light source so as to form a second optical signal in the target area; and performing photoelectric conversion on the second optical signal to obtain a second background value. Specifically, the light source device 10 is used to transmit the first waveband light signal to the target area which is not irradiated by the ultraviolet light source to form the second light signal in the target area, and the photodetector 20 is used to perform photoelectric conversion on the second light signal to obtain the second background value.
Sending a first band optical signal to a target area irradiated by an ultraviolet light source to form a third optical signal in the target area; and performing photoelectric conversion on the third optical signal to obtain a first signal value. Specifically, the light source device 10 is used to transmit a first wavelength band light signal to a target area irradiated by the ultraviolet light source to form a third light signal in the target area, and the photodetector 20 is used to perform photoelectric conversion on the third light signal to obtain a first signal value.
In step 230, a difference operation is performed according to the second background value and the first signal value to obtain a first signal difference value corresponding to a second sampling period. Specifically, a difference is computed between the second background value and the first signal value using processor 30.
In step 240, comparing whether the first signal difference value is greater than a lower threshold and less than an upper threshold; if yes, go to step 250; if not, no alarm is given. Specifically, the processor 30 is utilized to compare whether the first signal difference is greater than a lower threshold and less than an upper threshold.
It should be noted that the upper threshold is configured to be a signal difference of pure oil obtained by laboratory test. Alternatively, the upper threshold is configured to be a value lower than the detected white paper signal difference by about ten percent. Although the invention is not so limited. The upper threshold removes interference caused by very high reflectivity articles and also interference caused by strong fluorescence generated by excitation of non-oil substances. The lower threshold is configured to be a value that is 30% to 50% higher than the measured difference in the surface signal without oil spill or other contamination. In the present embodiment, the lower threshold is preferably 300, and the upper threshold is preferably 9000, but the present invention is not limited thereto. Because the reflectivities of seawater and oil are relatively close, the oil is generated due to excited fluorescence, the signal value is greater than that of the seawater, the signal value of the seawater is measured, the value slightly higher than the signal value is used as the lower threshold limit, and meanwhile, the interference caused by substances with lower reflectivities is eliminated.
In step 250, calculating an actual ratio between the second background value and the first background value, that is, obtaining an actual ratio between the second background value and the first background value, and determining whether the actual ratio is smaller than the reference ratio, if so, performing step S7; if not, no alarm is given. Here, the actual ratio of the second background value to the first background value is calculated by the processor 30.
It should be noted that the reference ratio is configured as a reference constant. In the present embodiment, the reference ratio is preferably 3. Although the invention is not so limited. If there is a disturbance on the sea surface, the background value detected in the sampling period will change greatly relative to the previous sampling period, and if there is only floating oil on the sea surface, the background value detected in the sampling period will not change much compared with the background value in the previous sampling period, so the embodiment of the present invention sets a reference ratio value, when the signal difference value is satisfied during the threshold value: and comparing the lower threshold value with the signal difference value with the upper threshold value, if the second background value/the first background value is smaller than the reference ratio, alarming, and if not, not alarming.
After a delay Ts in step 260, execution continues with step 270. Here, the processor 30 controls the delay module to perform the delay.
In step 270, the third background value and the second signal value after the time delay Ts is obtained through detection, and the time-delayed second signal difference value is calculated. Here, a third background value and a second signal value after a delay of Ts are obtained by using the first background value detection.
In step 280, comparing whether the second signal difference is greater than the lower threshold and less than the upper threshold; if yes, alarming, namely controlling an alarm 40 to generate an alarm signal by the processor 30; if not, no alarm is given. Here, the processor 30 compares whether the second signal difference is greater than the lower threshold and less than the upper threshold.
The oil spill detection method further comprises the following steps:
condensing the received optical signal to obtain an optical signal with high light intensity, wherein the received optical signal is condensed by the light condensing member 12;
filtering the condensed optical signal to obtain a first wavelength band optical signal, wherein the condensed optical signal is filtered by a narrow band filter 13;
reflecting the first band of wavelengths with a mirror, where the first band of wavelengths is reflected with a dichroic mirror;
the reflected first band of wavelengths is focused onto a target area where the first band of wavelengths is focused by a convex lens 16.
The oil spill monitoring method further comprises: and when alarming, photographing the target area to obtain a picture of the target area, and sending the picture to the detection terminal. Specifically, the target area is photographed by the visible light photographing device 60.
The oil spill detection method further comprises the following steps: and measuring the height value of the sea level, and adjusting the upper limit threshold value and the lower limit threshold value according to the height value. Specifically, the height value of the sea level is measured using the distance measuring device 70.
Specifically, in this embodiment, under clean water conditions, the first background value when the light source is not turned on is detected to be 100, at this time, a lump of oil drifts, the second background value when the light source device 10 is not turned on is detected to be not much changed to be about 200, and at the same time, the first signal value when the light source device 10 is turned on is detected to be 2000, at this time, the first signal difference is 1800 when 2000-; at this time, a time delay Ts is needed, if the condition is still met after the time delay Ts, an alarm is given, and if the signal value is recovered to be normal in the Ts, no alarm is given.
It should be noted that, if wood is drifted, the measured background value without the light source is about 1000, the ratio of the first background value and the second background value is 1000/100>3, no matter the signal value is not in the threshold interval, and then the background comparison is based on the previous one with large change until the normal state is recovered. Meanwhile, some non-oil substances, such as some organic solvents, cut fluorescent substances, and the signal difference of the substances is higher than the set upper threshold 9000, and no alarm is given.
In summary, the oil spill monitor according to the embodiment of the present invention uses the pulsed ultraviolet light source, which not only reduces power, but also facilitates measurement of the background value of the sea surface, and uses a method combining threshold analysis and background comparison to determine whether oil spill and eliminate false alarm, and the dual-filter arrangement can eliminate main interference, reduce background light, and improve signal-to-noise ratio. The invention also adds a light source device to ensure that the oil spilling monitor can normally work at night so as to accurately eliminate the false alarm condition, further reduces the false alarm and saves the labor by arranging the visible light camera, eliminates the influence of the height change of the seawater on the monitoring by adding the distance measuring device, adopts a coaxial light path system to ensure that the oil spilling monitor is reduced in size, and is convenient for adding a shading cylinder to improve the signal-to-noise ratio.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
1. An oil spill monitoring method, characterized in that the oil spill monitoring method comprises:
s1, in a first sampling period, obtaining a first background value in a target area which is not irradiated by the ultraviolet light source;
s2, in a second sampling period, obtaining a second background value in a target area which is not irradiated by the ultraviolet light source, and sending a first waveband optical signal to the target area to obtain a first signal value, wherein the first waveband optical signal is specifically ultraviolet light with a waveband of 300 nm-400 nm;
s3, performing difference operation according to the second background value and the first signal value to obtain a first signal difference value corresponding to a second sampling period;
s4, comparing whether the first signal difference is larger than a lower limit threshold and smaller than an upper limit threshold, wherein the upper limit threshold is configured to be the signal difference of pure oil obtained by laboratory test, and the lower limit threshold is configured to be a value which is 30% -50% higher than the measured sea surface signal difference under the condition of no oil spill or other impurities; if yes, go to step S6; if not, no alarm is given;
s5, calculating the actual ratio of the second background value to the first background value, and determining whether the actual ratio is smaller than a reference ratio, wherein the reference ratio is configured as a reference constant, if yes, executing step S6; if not, no alarm is given;
s6, after time delay, continuing to execute the step S7;
s7, detecting to obtain a delayed third background value and a delayed second signal value, and calculating to obtain a delayed second signal difference value;
s8, comparing whether the second signal difference value is larger than the lower threshold and smaller than the upper threshold; if yes, alarming; if not, no alarm is given.
2. The oil spill monitoring method of claim 1, wherein the oil spill detection method further comprises:
condensing the transmitted optical signal to obtain an optical signal with high light intensity;
filtering the condensed optical signal to obtain a first waveband optical signal;
reflecting the first band optical signal by using a reflector;
and focusing the reflected first waveband optical signal to a target area.
3. The oil spill monitoring method of claim 1, further comprising: and when alarming, photographing the target area to obtain a picture of the target area, and sending the picture to the detection terminal.
4. The oil spill monitoring method of claim 1, wherein the oil spill detection method further comprises: and measuring the height value of the sea level, and adjusting the upper limit threshold value and the lower limit threshold value according to the height value.
5. An all-weather non-contact type oil spill detector for oil spill monitoring by the oil spill monitoring method according to any one of claims 1 to 4, comprising:
the device comprises a light source device and a detection device, wherein the light source device is constructed to send a first waveband light signal to a target area to be detected so as to form a second waveband light signal in the target area, the first waveband light signal is specifically ultraviolet light with a waveband of 300 nm-400 nm, and the second waveband light signal is specifically ultraviolet light with a waveband of 400 nm-550 nm;
a photodetector configured to photoelectrically convert the received optical signal of the second wavelength band to obtain a detection electric signal;
a processor configured to determine whether oil spill occurs according to the detection electric signal,
the processor is used for performing difference operation according to the second background value and the first signal value in the oil spill monitoring method to obtain a first signal difference value corresponding to a second sampling period, comparing whether the first signal difference value is larger than a lower limit threshold and smaller than an upper limit threshold, calculating an actual ratio of the second background value and the first background value, judging whether the actual ratio is smaller than the reference ratio, calculating a delayed second signal difference value according to the third background value and the second signal value, and comparing whether the second signal difference value is larger than the lower limit threshold and smaller than the upper limit threshold;
an alarm configured to generate an alarm signal;
and the delay module is configured to enable the oil spilling detector to carry out delay detection so as to obtain a third background value and a second signal value.
6. The oil spill monitor of claim 5, further comprising a communication module, wherein the alarm is further configured to generate an alarm message, wherein the alarm sends the alarm message to a monitoring terminal via the communication module.
7. The oil spill monitor of claim 5, wherein the light source device comprises:
an LED lamp;
the light gathering piece is arranged opposite to the LED lamp;
the narrow-band filter is arranged on one side, back to the LED lamp, of the light gathering piece;
the light filtering component is arranged on the light incident surface of the photoelectric detector;
the narrow-band filter is arranged between the narrow-band filter and the filtering component, and the normal direction of the reflector forms an angle of 45 degrees with the filtering component;
the convex lens is arranged on one side of the reflector opposite to the photoelectric detector and used for focusing light;
wherein, photoelectric detector, the filtering subassembly the speculum with convex lens arranges in proper order and sets up and aligns on the first direction, the LED lamp the spotlight piece narrowband filter with the speculum is arranged in proper order and is set up and align on the second direction, first direction perpendicular to the second direction.
8. The oil spill monitor of any one of claims 5 to 7, further comprising a visible light camera, wherein the processor is further configured to control the visible light camera to take a picture after receiving the alarm message.
9. The oil spill monitor of any one of claims 5 to 7, further comprising a distance measuring device connected to the processor, the distance measuring device being configured to measure a height of sea level, the processor being further configured to adjust a parameter value of the processor based on the height measured by the distance measuring device.
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| CN111784629B (en) * | 2020-05-15 | 2024-03-19 | 华能国际电力股份有限公司海门电厂 | Oil leakage detection method and system |
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