Oil film monitoring device and method on water surface

Abstract

This application relates to a device and method for monitoring oil film on the water surface. The device includes: multiple excitation units for emitting ultraviolet light of a preset wavelength; a fluorescence receiving unit for receiving fluorescence signals and converting them into fluorescent electrical signals; a signal processing unit electrically connected to the excitation units and the fluorescence receiving unit, which synchronously drives the multiple excitation units and / or receives the fluorescent electrical signals, and outputs a fluorescence spectral signal after filtering, amplification, analog-to-digital conversion, and demodulation; a ranging unit for measuring the vertical distance between the device and the water surface and outputting distance information; and a data acquisition and transmission unit electrically connected to the excitation unit, the fluorescence receiving unit, the signal processing unit, and the ranging unit, which outputs an alarm signal after judging based on the fluorescence spectral signal and distance information. This application improves the sensitivity and accuracy of on-site monitoring by correcting the judgment result using distance information.

Description

Technical Field

[0001] This application relates to the field of photoelectric detection technology, and in particular to a device and method for monitoring oil film on the water surface of drilling platforms. Background Technology

[0002] With economic development and technological advancements, human demand for oil is constantly increasing. The oceans, covering most of the Earth's surface, are a key area for oil extraction. However, with the development of offshore oil and the increase in the volume of oil transported by sea, the possibility of oil spills polluting the marine environment has also greatly increased. Almost every year there are reports of serious marine environmental pollution caused by oil or refined oil transport ship leaks and collisions, as well as leaks from offshore oil drilling platforms.

[0003] With the development of science and technology, ports and wharves have basically achieved 24 / 7 monitoring of oil spills on the water surface through optical remote sensing technology. However, offshore drilling platforms have always been a difficult area for 24 / 7 monitoring of oil spills on the water surface due to difficulties such as large tidal range and long distance. Summary of the Invention

[0004] This application provides a device and method for monitoring oil film on the water surface of a drilling platform, enabling rapid detection of the water surface at a greater vertical distance, timely detection of oil spill accidents, and prompting on-site personnel to handle the situation immediately, thereby reducing environmental damage.

[0005] In a first aspect, embodiments of this application provide a surface oil film monitoring device, applied to a drilling platform, comprising a device body, the device body including:

[0006] Multiple excitation light units are used to emit ultraviolet light in a preset wavelength band. The simultaneous use of multiple excitation light units compensates for the power intensity deficiency of a single ultraviolet light source.

[0007] A fluorescence receiving unit is used to receive fluorescence signals and convert them into fluorescence electrical signals;

[0008] The signal processing unit is electrically connected to the excitation unit and the fluorescence receiving unit. The signal processing unit is used to synchronously drive multiple excitation units and / or receive the fluorescence electrical signal and output the fluorescence spectrum signal after filtering, amplification, analog-to-digital conversion and demodulation. Specifically, the signal processing unit uses PWM pulses to synchronously drive multiple excitation units so as to control the intensity of ultraviolet light output by the excitation units through modulation signals.

[0009] The ranging unit is used to measure the vertical distance between the main body of the device and the water surface and output the distance information;

[0010] The data acquisition and transmission unit is electrically connected to the excitation unit, fluorescence receiving unit, signal processing unit, and ranging unit. The data acquisition and transmission unit outputs an alarm signal after making a judgment based on the fluorescence spectral signal and distance information. Specifically, the data acquisition and transmission unit determines the ultraviolet fluorescence intensity based on the spectral signal and determines the presence of oil pollution based on this intensity. Since the intensity of the fluorescence spectral signal is related to the cleanliness of the water surface and the distance information, this embodiment of the application simultaneously corrects the judgment result using distance information to eliminate interference from foreign objects such as garbage on the water surface and improve the sensitivity and accuracy of on-site monitoring.

[0011] In some embodiments, a plurality of excitation light units are symmetrically and uniformly distributed based on a fixed surface of a light source, and the light sources are all located on the same plane to ensure light source intensity; the fluorescence receiving unit is fixedly disposed at the geometric center of the plurality of excitation light units, and the receiving area of ​​the fluorescence receiving unit is covered by the excitation light units to maximize the utilization of the receiving capability of the fluorescence receiving unit.

[0012] In some embodiments, the fluorescence receiving unit further includes: a fluorescence lens, a fluorescence filter, and a detector arranged sequentially along the fluorescence optical path. The fluorescence signal is converged by the fluorescence lens, passes through the fluorescence filter, and reaches the detector, where it is converted into a fluorescence electrical signal.

[0013] In some embodiments, the signal processing unit includes a filter circuit, an operational amplifier circuit, an analog-to-digital converter circuit, and a modulation and demodulation circuit. The data acquisition and transmission unit adjusts the amplification factor of the operational amplifier circuit according to the distance information to obtain the optimal detection sensitivity within that distance range.

[0014] In some embodiments, the excitation light unit is disposed within the main body of the device via a light source fixing plate. By fine-tuning the light source fixing plate, the light beams output by the multiple excitation light units converge at a preset position, and the spot diameter of the light beam is minimized after convergence.

[0015] In some embodiments, the detector is mounted inside the device body via a mounting base plate, and the mounting base plate and the light source fixing plate are disposed on the same plane.

[0016] In some embodiments, the preset position is half of the height difference Δh between the installation position of the device body and the water surface, and the vertical distance between this position and the installation position is set as h.

[0017] In some embodiments, the focal length of the detector is finely adjusted using fixed shims.

[0018] In some embodiments, an image acquisition unit is also included, electrically connected to the data acquisition and transmission unit. The image acquisition unit is used to capture and acquire image data of the target area. This image acquisition unit provides the most direct photographic evidence of the accident scene for on-site monitoring.

[0019] Secondly, embodiments of this application provide a method for monitoring oil film on the water surface, based on the oil film monitoring device described in the first aspect above, including:

[0020] In the ultraviolet light emission step, multiple excitation light units are simultaneously activated and modulated to emit ultraviolet light of a preset wavelength onto the water surface of the target area.

[0021] In the fluorescence receiving step, the fluorescence receiving unit receives a fluorescence signal and outputs it as a fluorescence electrical signal, and the fluorescence electrical signal is processed by the signal processing unit and output as a fluorescence spectral signal.

[0022] The distance information acquisition step involves reading the distance information through the ranging unit.

[0023] The oil spill warning procedure involves determining whether an oil spill has occurred on the water surface based on the fluorescence spectral signal and the distance information, and then outputting a warning signal.

[0024] In some embodiments, the method for monitoring oil film on the water surface according to this application further includes an image data acquisition step, wherein when the oil spill warning step outputs the warning signal, the image acquisition unit is activated to capture and acquire image data of the target area and store it.

[0025] In some embodiments, the data acquisition and transmission unit pre-stores the fluorescence intensity of different oil products at different heights and the fluorescence intensity of conventional plastic waste, so as to combine the fluorescence spectral signal and the distance information to determine whether there is oil spill on the water surface, thereby effectively realizing the monitoring and alarm of oil spill accidents on the drilling platform and improving the sensitivity and accuracy of on-site monitoring.

[0026] Compared to related technologies, the surface oil film monitoring device and method provided in this application, by enhancing the light intensity of the excitation light unit, achieves rapid monitoring technology of surface oil film at a greater vertical distance, enabling all-weather monitoring of surface oil spills. This allows for timely detection of surface oil spill accidents on offshore oil drilling platforms, alerting on-site personnel to handle the situation immediately and minimizing environmental damage.

[0027] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a structural block diagram of a water surface oil film monitoring device according to an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of a water surface oil film monitoring device according to an embodiment of this application;

[0031] Figure 3 This is a bottom view of the structure of the water surface oil film monitoring device according to an embodiment of this application;

[0032] Figure 4 This is a side view of the water surface oil film monitoring device according to an embodiment of this application;

[0033] Figure 5 This is a cross-sectional view AA of a water surface oil film monitoring device according to an embodiment of this application;

[0034] Figure 6 This is a cross-sectional view BB of a water surface oil film monitoring device according to an embodiment of this application;

[0035] Figure 7 This is a flowchart of a water surface oil film monitoring method according to an embodiment of this application.

[0036] In the picture:

[0037] 1. Excitation unit; 2. Fluorescence receiving unit; 3. Signal processing unit;

[0038] 4. Data acquisition and transmission unit; 5. Ranging unit; 6. Image acquisition unit; 7. Main body of the device;

[0039] 11. Light source; 12. Light source filter; 13. Light source lens;

[0040] 21. Fluorescent lens; 22. Fluorescent filter; 23. Detector. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0042] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0043] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0044] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0045] Drilling platforms are offshore structures primarily used for drilling wells. They are equipped with drilling, power, communication, and navigation equipment, as well as safety, rescue, and personnel living facilities, making them an indispensable tool for offshore oil and gas exploration and development. To promptly detect oil spills on the water surface of drilling platforms, this application provides a water surface oil film monitoring device for use on drilling platforms. Figure 1-6 This is a schematic diagram of the structure of the water surface oil film monitoring device according to an embodiment of this application, as shown below. Figure 6 As shown, the device includes a main body 7. Optionally, the main body 7 is a cylindrical aluminum alloy structure formed by one-piece machining. The interior of the main body 7 includes:

[0046] Multiple excitation light units 1 are used to emit ultraviolet light in a preset wavelength band. Specifically, each excitation light unit 1 includes a light source 11, a light source filter 12, and a light source lens 13. Multiple excitation light units 1 are used simultaneously to compensate for the power intensity deficiency of a single ultraviolet light source. Optionally, in this embodiment, six excitation light units 1 are used simultaneously to compensate for the power intensity limitation of a single excitation light unit 1. This is an example, not a limitation; existing monitoring devices using a single excitation light unit 1 cannot achieve an ultraviolet light intensity of over 20W in the 365nm band, while the intensity in this embodiment can reach over 100W.

[0047] The fluorescence receiving unit 2 is used to receive fluorescence signals and convert them into fluorescence electrical signals. Specifically, the fluorescence receiving unit 2 further includes: a fluorescence lens 21, a fluorescence filter 22, and a detector 23 arranged sequentially along the fluorescence optical path. The fluorescence signal is focused by the fluorescence lens 21, passes through the fluorescence filter 22, and reaches the detector 23, where it is converted into a fluorescence electrical signal. Optionally, the detector 23 is a photodiode detector.

[0048] The signal processing unit 3 is electrically connected to the excitation unit 1 and the fluorescence receiving unit 2. The signal processing unit 3 is used to synchronously drive multiple excitation units 1 and / or receive fluorescence electrical signals and output fluorescence spectral signals after filtering, amplification, analog-to-digital conversion, and demodulation. Specifically, the signal processing unit 3 uses a PWM pulse modulation signal to synchronously drive multiple excitation units 1 so as to control the intensity of ultraviolet light output by the excitation unit 1 through the modulation signal. Optionally, the signal processing unit 3 includes at least: a filtering circuit, an operational amplifier circuit, an analog-to-digital conversion circuit, and a modulation and demodulation circuit. The data acquisition and transmission unit 4 can adjust the amplification factor of the operational amplifier circuit according to the distance information to obtain the optimal detection sensitivity within the distance range.

[0049] The ranging unit 5 is used to measure the vertical distance between the main body 7 of the device and the water surface and output the distance information. Optionally, the ranging unit 5 is a radar detection module; and

[0050] The data acquisition and transmission unit 4 is electrically connected to the excitation unit 1, the fluorescence receiving unit 2, the signal processing unit 3, and the ranging unit 5. The data acquisition and transmission unit 4 outputs an alarm signal after judging based on the fluorescence spectral signal and distance information. Specifically, the data acquisition and transmission unit 4 judges the ultraviolet fluorescence intensity based on the spectral signal, and determines the presence of oil pollution based on this ultraviolet fluorescence intensity. Since the intensity of the fluorescence spectral signal is related to the cleanliness of the water surface and distance information, this embodiment of the application also corrects the judgment result using distance information to eliminate interference from foreign objects such as garbage on the water surface, thereby improving the sensitivity and accuracy of on-site monitoring.

[0051] Image acquisition unit 6 is electrically connected to data acquisition and transmission unit 4. Image acquisition unit 6 is used to capture and acquire image data of the target area. This image acquisition unit 6 provides the most direct photographic evidence of the accident scene for on-site monitoring.

[0052] The surface oil film monitoring device based on the above structure is applied to drilling platforms. When petroleum-based substances are present on the water surface, the aromatic hydrocarbons in petroleum-based substances and their derivatives will be excited by ultraviolet light to produce ultraviolet fluorescence of a specific wavelength. For example, when petroleum-based substances and their derivatives are irradiated with 365nm ultraviolet light, the aromatic hydrocarbons inside are excited by the 365nm ultraviolet light and produce fluorescence in the 420-550nm band. The fluorescence receiving unit 2 performs photoelectric conversion on the ultraviolet fluorescence. In this embodiment, by enhancing the light intensity of the excitation light unit 1, a faster surface oil film monitoring technology is achieved at a greater vertical distance, enabling all-weather surface oil spill monitoring. This allows for timely detection of surface oil spill accidents on offshore oil drilling platforms, alerting on-site personnel to handle the situation immediately and minimize environmental damage. In addition, when the on-duty personnel receive the device's alarm information, they can first use image data to preliminarily determine whether there is a large area of ​​oil pollution on the water surface below the device. This helps determine whether the alarm is caused by an oil spill accident, sporadic oil slicks, or a false alarm, thereby avoiding unnecessary alarm processing costs.

[0053] like Figure 3 , 4 As shown, multiple excitation light units 1 are symmetrically and uniformly distributed based on a fixed surface of a light source, with all light sources on the same plane to ensure light source intensity. To enable the fluorescence receiving unit 2 to receive more fluorescence, the fluorescence receiving unit 2 is fixedly positioned at the geometric center of the multiple excitation light units 1. The detector 23 is mounted inside the main body 7 via a mounting base plate, and the mounting base plate and the light source fixing plate are on the same plane. Based on this, the receiving area of ​​the fluorescence receiving unit 2 is covered by the excitation light units 1 to maximize the receiving capacity of the fluorescence receiving unit 2. In actual installation and use, the focal length of the detector 23 is finely adjusted using fixing shims.

[0054] Furthermore, the excitation light unit 1 is mounted inside the device body 7 via a light source fixing plate. By fine-tuning the light source fixing plate, the beams output by multiple excitation light units 1 converge at a preset position, and the beam spot diameter is minimized after convergence to ensure optimal luminous intensity. Specifically, the preset position is half the height difference Δh between the installation position of the device body 7 and the water surface, and the vertical distance h between this position and the installation position is defined as h. In this embodiment, the six excitation light units 1, after being fixed to the device body 7, can output six parallel beams of light. Before the device is installed on-site, the height difference Δh between the preset installation position and the water surface is pre-confirmed, thereby obtaining the vertical distance h from the center point of this height difference to the device. When assembling and using the device, the light source fixing plate is pre-adjusted as described above.

[0055] This application also provides a method for monitoring oil film on the water surface. Figure 7 This is a flowchart of a water surface oil film monitoring method according to an embodiment of this application, as follows: Figure 7 As shown, the process includes the following steps:

[0056] In the ultraviolet light emission step S1, multiple excitation light units 1 are simultaneously activated and modulated to emit ultraviolet light of a preset wavelength to the water surface of the target area.

[0057] In fluorescence receiving step S2, fluorescence signal is received by fluorescence receiving unit 2 and output as fluorescence electrical signal. The fluorescence electrical signal is processed by signal processing unit 3 and output as fluorescence spectrum signal.

[0058] In step S3, distance information is acquired by reading distance information through the ranging unit 5.

[0059] Step S4 of the oil spill warning process involves determining whether an oil spill has occurred on the water surface based on fluorescence spectral signals and distance information, and then outputting a warning signal. Specifically, considering that the fluorescence signal intensity produced by ultraviolet light irradiation varies when petroleum, refined oil, and plastic products are at the same or different heights, the data acquisition and transmission unit 4 pre-stores the fluorescence intensity of different oil products at different heights and the fluorescence intensity of conventional plastic waste. This information is combined with fluorescence spectral signals and distance information to determine whether an oil spill has occurred on the water surface, effectively enabling monitoring and alarming of oil spill accidents on the drilling platform and improving the sensitivity and accuracy of on-site monitoring.

[0060] Based on the above steps, the embodiments of this application can effectively distinguish between the monitored water and oil or water surface debris, and effectively eliminate the interference caused by water surface debris.

[0061] In some embodiments, the method for monitoring oil film on the water surface according to this application further includes:

[0062] In image data acquisition step S5, when the oil spill warning step S4 outputs a warning signal, the image acquisition unit 6 is activated to capture and store image data of the target area. Based on this, when the on-duty personnel receive the device alarm information, they can first use the image data to preliminarily determine whether there is a large area of ​​oil pollution on the water surface below the device, thereby determining whether the alarm is caused by an oil spill accident, sporadic oil slicks, or a false alarm, thus avoiding unnecessary alarm handling costs.

[0063] It should be noted that the steps shown in the above process or in the flowchart of the accompanying figures can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A water surface oil film monitoring device, characterized by The device comprises a device main body (7) which is an integrally processed cylindrical aluminum alloy structure, and the inside of the device main body (7) comprises: a plurality of excitation light units (1) for emitting ultraviolet light of a preset wave band; specifically, the excitation light unit (1) comprises a light source (11), a light source filter (12) and a light source lens (13); the plurality of excitation light units (1) are used synchronously, which makes up for the defect of the power intensity of a single ultraviolet light source; a fluorescence receiving unit (2) for receiving a fluorescence signal and converting it into a fluorescence electric signal; specifically, the fluorescence receiving unit (2) further comprises a fluorescence lens (21), a fluorescence filter (22) and a detector (23) which are arranged in sequence along a fluorescence light path, the fluorescence signal is converged by the fluorescence lens (21) and then reaches the detector (23) through the fluorescence filter (22), and the fluorescence signal is converted into a fluorescence electric signal by the detector (23); the detector (23) is a photodiode detector; a signal processing unit (3) which is electrically connected with the excitation light unit (1) and the fluorescence receiving unit (2), and is used for synchronously driving the plurality of excitation light units (1) and / or receiving the fluorescence electric signal and outputting a fluorescence spectrum signal through filtering processing, amplification processing, analog / digital conversion and demodulation processing; specifically, the signal processing unit (3) synchronously drives the plurality of excitation light units (1) by using a PWM pulse modulation signal, so as to control the ultraviolet light intensity output by the excitation light unit (1) through the modulation signal; the signal processing unit (3) at least comprises a filter circuit, an operational amplifier circuit, an analog / digital conversion circuit and a modulation / demodulation circuit; a data acquisition and transmission unit (4) adjusts the amplification multiple of the operational amplifier circuit according to distance information, so as to obtain the best detection sensitivity within a distance range; a ranging unit (5) for measuring the vertical distance of the device main body (7) from the water surface and outputting distance information, and the ranging unit (5) is a radar detection module; the data acquisition and transmission unit (4) which is electrically connected with the excitation light unit (1), the fluorescence receiving unit (2), the signal processing unit (3) and the ranging unit (5), and outputs an alarm signal after judging according to the fluorescence spectrum signal and the distance information; specifically, the data acquisition and transmission unit (4) judges the ultraviolet fluorescence intensity based on the spectrum signal, and judges whether there is oil stain according to the ultraviolet fluorescence intensity; since the intensity of the fluorescence spectrum signal is related to the cleanliness of the water surface and the distance information, the judgment result is corrected through the distance information at the same time, so as to exclude the interference of the water surface garbage and improve the on-site monitoring sensitivity and accuracy; an image acquisition unit (6) which is electrically connected with the data acquisition and transmission unit (4) and is used for shooting and obtaining image data of a target area; the image acquisition unit (6) provides the most direct photo evidence for the on-site monitoring of the accident site. The multiple excitation light units (1) are symmetrically and uniformly distributed based on a light source fixing surface, and the light sources are all in the same plane to ensure light source intensity; in order to enable the fluorescence receiving unit (2) to receive more fluorescence, the fluorescence receiving unit (2) is fixedly arranged at the geometric center of the multiple excitation light units (1), the detector (23) is arranged in the device main body (7) through a mounting base plate, and the mounting base plate and the light source fixing plate are arranged in the same plane, based on which, the receiving area of the fluorescence receiving unit (2) is covered by the excitation light unit (1) to maximize the receiving capacity of the fluorescence receiving unit (2); in specific installation and use, the focal length of the detector (23) is finely adjusted through a fixing gasket; Further, the excitation light unit (1) is arranged in the device main body (7) through the light source fixing plate, the light beams output by the multiple excitation light units (1) are converged at a preset position through fine adjustment of the light source fixing plate, and the spot diameter of the light beams after convergence is the smallest to ensure light emission intensity; the preset position is specifically one-half of the height variation difference △h of the installation position of the device main body (7) from the water surface, and the vertical distance between the position and the installation position is h; Based on the above-mentioned structure of the water surface oil film monitoring device, when there is oil on the water surface, the aromatic hydrocarbon components in the oil and its derivatives will emit ultraviolet fluorescence of a specific wavelength under ultraviolet light irradiation; the fluorescence receiving unit (2) performs photoelectric conversion on the ultraviolet fluorescence, the light intensity of the excitation light unit (1) is enhanced, and a far vertical distance water surface oil film rapid monitoring technology is realized, the water surface oil spill monitoring is performed all day long, the water surface oil spill accident on the offshore oil drilling platform can be found in time, the on-site operating personnel are reminded to handle in the first time, so as to reduce the damage to the environment; in addition, after the on-duty personnel receive the device alarm information, whether there is a large area of oil on the water surface below the device can be initially judged through image data, so as to judge whether the alarm reason is caused by the oil spill accident, sporadic oil splashes or device false alarm, thereby avoiding unnecessary alarm processing cost.

2. A method of monitoring an oil film on water based on the device for monitoring an oil film on water according to claim 1, characterized by, It comprises: An ultraviolet light emitting step S1, in which multiple excitation light units (1) are synchronously started and modulated to emit ultraviolet light of a preset wave band to the water surface of a target area; A fluorescence receiving step S2, in which a fluorescence receiving unit (2) receives fluorescence signals and outputs them as fluorescence electric signals, and the fluorescence electric signals are processed by a signal processing unit (3) and output as fluorescence spectrum signals; A distance information obtaining step S3, in which distance information is read by a distance measuring unit (5); A water surface oil spill early warning step S4, in which whether there is an oil spill on the water surface is judged according to the fluorescence spectrum signals and the distance information, and an early warning signal is output; specifically, considering that the fluorescence signal intensity generated by ultraviolet light irradiation is different when oil, refined oil and plastic products are at the same height or different heights, the data acquisition and transmission unit (4) pre-stores the fluorescence intensity of different oil products at different heights and the fluorescence intensity of conventional plastic garbage, so as to judge whether there is an oil spill on the water surface in combination with the fluorescence spectrum signals and the distance information, to effectively realize drilling platform water surface oil spill accident monitoring and alarm and improve on-site monitoring sensitivity and accuracy. Image data acquisition step S5, when the water surface oil spill early warning step S4 output early warning signal, start image acquisition unit (6) to shoot and store the image data of the target area; based on this, when the duty personnel receives the device alarm information, can first through the image data preliminary judgment device below the water surface whether there is a large area of oil pollution, to determine the alarm cause is the oil spill accident, sporadic oil, device false alarm which factor caused, thus avoiding unnecessary alarm processing cost; Based on the above steps, the water and oil or water surface garbage monitored can be effectively distinguished, and the interference caused by the water surface garbage can be effectively excluded.

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