An oil spill monitoring system and method automatically adjusting light source angle

Abstract

The application provides an automatic adjusting light source angle oil spill monitoring system and method. The oil spill monitoring system comprises an MCU controller, an ultraviolet light source arranged on the bottom surface of an oil spill monitoring device, a light source adjusting mechanism, a fluorescent sensor, a distance sensor and an illumination intensity sensor. The fluorescent sensor is provided with two groups, the illumination intensity sensor is located between the two fluorescent sensors, and the distance sensor is located between the light source and the illumination intensity sensor. The light source adjusting mechanism comprises a motor and a transmission mechanism. The motor is connected with the lamp holder of the ultraviolet light source through the transmission mechanism and controls the rotation of the ultraviolet light source. The MCU controller controls the motor and the light source. In the monitoring process, the emission angle of the ultraviolet light source is controlled to the deflection angle alpha by the motor. The application effectively utilizes the illumination intensity, so that the photoelectric sensor obtains the maximum illumination intensity. The ultraviolet LED can be automatically adjusted according to the distance from the water surface, and the water surface oil spill condition can be more accurately monitored.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water surface oil spill monitoring, and particularly relates to an oil spill monitoring system and method based on fluorescence excitation and capable of automatically adjusting the angle of a light source. BACKGROUND

[0002] With the rapid advancement of global industrialization, people's demand for oil energy is increasing day by day, and deep-sea oil exploitation and marine oil transportation activities are increasing dramatically, which leads to frequent oil spill accidents, seriously endangering the survival environment of marine organisms and having a profound impact on marine ecology and coastal production and life. Petrochemical enterprises need to set up oil spill monitoring devices in areas where oil spill risks may occur, such as rainwater discharge outlets and oil terminals, according to the requirements of the water environment risk prevention and control technology, to monitor and alarm oil spills in real time. Terminals and loading and unloading stations should set up water oil and other bulk liquid pollution hazard goods leakage monitoring and alarm devices according to the requirements, monitor small areas, and can timely detect small oil spill events and issue an alarm at the first time.

[0003] The existing oil spill monitoring devices are mainly divided into gas monitoring method, visible light method, infrared photometry method, ultraviolet photometry method, microwave radiometer method, electromagnetic energy absorption method and fluorescence spectroscopy method according to the monitoring mechanism. In the prior art, the principle of ultraviolet-induced oil fluorescence is often used for oil spill monitoring, ultraviolet laser or pulsed xenon lamp or LED is used as the excitation light source, a photoelectric detector is used for signal acquisition, and whether oil spill occurs is determined by threshold judgment of signal intensity. The principle of fluorescence technology for monitoring oil spill is that the light source emits light to the water surface through the emission light path, excites the oil on the liquid surface, generates fluorescence, and reaches the monitoring equipment along the receiving light path. The monitoring equipment processes the received light and determines whether oil spill occurs on the water surface.

[0004] At present, the light path of the oil spill monitoring device based on fluorescence technology on the market mainly has two forms. One relies on a secondary mirror to integrate the emission light path and the receiving light path together. This product needs to add a convex mirror for focusing. In the case of ensuring light intensity and equipment sensitivity, the monitoring area is sacrificed. The other kind separates the emission light path and the receiving light path, and the two light paths are randomly distributed. Although the effective monitoring area is ensured, the emission angle of the light source cannot be adjusted, and the effective light of the light source cannot change with the distance. However, in the oil spill monitoring environment, the monitoring distance often changes due to changes in the external environment, and the monitoring signal intensity will change significantly. The fixed light source cannot maximize the use of light illumination, so it cannot adapt to the change of the detection distance and cannot be well applied to the monitoring environment with complex monitoring environment and variable detection distance.

[0005] In view of the above problems, an oil spill monitoring device based on fluorescence excitation and capable of automatically adjusting the angle of a light source is needed. SUMMARY

[0006] In view of the fact that the light source cannot change the angle in the current fluorescence technology in the oil spill monitoring means, so that the light source light cannot be used to the maximum extent, the application provides an automatic adjustment light source angle oil spill monitoring system and method, the system automatically adjusts the exit angle of the light source according to the illumination intensity, through the collection adjustment, combined with the feedback system and algorithm, the exit light of the light source is irradiated below the sensor in real time, the light is fully utilized, the diffuse reflection on the liquid surface is changed into directional reflection, the emitted light is more fully utilized, under the same power, the sensitivity of the monitoring device is improved.

[0007] In order to achieve the above technical purpose, the application provides an automatic adjustment light source angle oil spill monitoring system, the oil spill monitoring system comprises an ultraviolet light source arranged on the bottom surface of an oil spill monitoring device, a light source adjusting mechanism, a fluorescence sensor, a distance sensor and an illumination intensity sensor, the fluorescence sensor is provided with two groups, the illumination intensity sensor is located between the two fluorescence sensors, and the distance sensor is located between the ultraviolet light source and the illumination intensity sensor.

[0008] The light source adjusting mechanism comprises a motor and a transmission mechanism, the transmission mechanism comprises a main drive gear mounted on the output shaft of the motor, a transmission gear meshing with the main drive gear and a first transmission wheel mounted on the light source lamp holder, a second transmission wheel is coaxially connected on the rotating shaft of the transmission gear, and the first transmission wheel and the second transmission wheel are drivingly connected through a transmission belt.

[0009] The oil spill monitoring system further comprises an MCU controller, the signal output ends of the distance sensor, the fluorescence sensor and the illumination intensity sensor are connected with the signal input end of the MCU controller, and the signal output end of the MCU controller is connected with the control end of the motor and the light source.

[0010] The optimal technical scheme of the application is that the light source and the two fluorescence sensors are in an isosceles triangle distribution, the illumination intensity sensor is located on the midline of the two fluorescence sensors, and the illumination intensity sensor and the two fluorescence sensors are on the same straight line; the distance sensor, the illumination intensity sensor and the light source are on a straight line, and the distance sensor is located at the midpoint.

[0011] The optimal technical scheme of the application is that the oil spill monitoring system further comprises a travel switch, the ultraviolet light source is provided with a fixed shell, and the ultraviolet light source lamp holder is rotatably installed in the fixed shell, and the ultraviolet light source can rotate in the fixed shell; the travel switch is provided with two groups, and is symmetrically installed in the inner walls of the fixed shells on both sides of the ultraviolet light source, and the signal output ends of the travel switches are connected with the signal input end of the MCU controller, and are used for limiting the rotation of the light source.

[0012] The preferable technical scheme of the present application is that the ultraviolet light source is an LED ultraviolet light source with a wave band of 300 nm.

[0013] The preferable technical scheme of the present application is that the distance sensor is an infrared distance test sensor.

[0014] The present application also provides an automatic adjusting light source angle oil spill monitoring method, which uses the automatic adjusting light source angle oil spill monitoring system to monitor, and the specific steps are as follows:

[0015] S1. The ultraviolet light source, the fluorescence sensor, the distance sensor and the light intensity sensor are all installed on the bottom plate of the oil spill monitoring equipment, to ensure that the above components are in the same plane, and the two fluorescence sensors are symmetrically located and the plane is parallel to the monitored liquid surface.

[0016] S2. The distance between the bottom plate of the oil spill monitoring equipment and the monitored liquid surface, i.e. the distance H1 between the ultraviolet light source and the monitored liquid surface, is measured by the distance sensor, and then the deflection angle a of the ultraviolet light source is calculated according to the distance L between the distance sensor and the ultraviolet light source, and the calculation process is as follows:

[0017] tan a = L / H1

[0018] a = arctan (L / H1) ;

[0019] S3. The MCU controller drives the stepping motor to rotate according to the theoretical optimal deflection angle a of the ultraviolet light source calculated in step S2, so that the emission angle of the ultraviolet light source reaches the theoretical optimal deflection angle a; the specific process is to issue an instruction according to the calculated angle; according to the pulse number and the corresponding deflection angle, according to the setting of the stepping motor, the single deflection angle is assumed to be b, and the pulse number is a / b; the stepping motor is driven to rotate, so that the emission angle of the light source reaches the theoretical deflection angle a.

[0020] S4. After adjusting the emission angle of the ultraviolet light source, the ultraviolet light source produces fluorescence to the water surface, and the fluorescence excited by the ultraviolet light source is received by the fluorescence sensor to monitor the oil spill on the water surface; during the monitoring process, the distance between the oil spill monitoring equipment and the monitored liquid surface is monitored in real time by the distance sensor, and when the distance between the oil spill monitoring equipment and the monitored liquid surface changes, a new theoretical optimal deflection angle a' is calculated according to the changed distance H1' between the oil spill monitoring equipment and the monitored liquid surface according to the above formula 1, and the MCU controller drives the motor to rotate according to the calculated new theoretical optimal deflection angle a', so that the emission angle of the ultraviolet light source reaches the deflection angle a'.

[0021] The preferred technical scheme of the present application: in the S3 step, when the emission angle of the ultraviolet light source reaches the deflection angle alpha, the ultraviolet light source is turned on, the light source periodically emits light, the real-time light intensity is collected by the light intensity sensor, and the average light intensity at this moment is stored as the original reference data A; then the ultraviolet light source is controlled to rotate left and right based on the deflection angle alpha to find a larger light intensity point, and the maximum angle of rotation on each side is controlled to be 2-3 degrees; first, the ultraviolet light source is controlled to rotate to one side based on the deflection angle alpha, and the light intensity sensor collects the real-time light intensity at the same time, and compares it with the original reference data A; when a larger light intensity than the original reference data A appears, the light intensity collected at this moment replaces the original reference data A as the new reference data A ， At the same time, the MCU controller records the deflection angle of the ultraviolet light source at this moment, and if there is no larger light intensity than the original reference data A in this interval, the device still uses the original reference data A as the reference data; when the rotation to one side reaches 2-3 degrees, the ultraviolet light source is controlled to return to the original deflection angle alpha, and is rotated to the other side based on the deflection angle alpha, with 0.5 degrees as the increment, and the larger light intensity point is found in the same way; during the left and right rotation, after the maximum light intensity point is found, the position of the ultraviolet light source is kept unchanged to monitor the oil spill on the water surface.

[0022] The preferred technical scheme of the present application: in the S3 step, the ultraviolet light source is limited by the limit switch during rotation to determine that the ultraviolet light source does not deviate from the irradiation range.

[0023] The light source transmission structure of the present application comprises a stepping motor, a multi-stage meshing gear unit, and a movable gear mounted on the base of the LED ultraviolet light source. The single-chip microcomputer MCU sends out a PWM wave to drive the stepping motor to rotate, and the motor drives the multi-stage meshing gear unit to start running, and the belt drive drives the gear on the LED light source to rotate, so that the LED light source rotates within a certain range.

[0024] The characteristics of the present application are:

[0025] (1) The present application emits infrared light from the liquid surface through the distance sensor, uses the propagation speed of light in air and the receiving time to determine the distance between the light source and the liquid surface, then calculates the optimal deflection angle of the light source according to the distance between the light source and the infrared sensor, and then controls the LED ultraviolet light source to deflect to the optimal angle; and in the monitoring process, the distance sensor monitors the distance between the light source and the liquid surface in real time, and when the distance changes, a new optimal theoretical deflection angle is calculated again, and the deflection angle of the LED ultraviolet light source is adjusted again. The present application can adjust the light intensity of the LED ultraviolet light source in real time according to the distance between the light source and the monitoring liquid surface, and improve the light intensity from the light source.

[0026] (2) After calculating the theoretically optimal deflection angle, the controller issues an instruction to drive the power supply of the LED ultraviolet light source, the LED ultraviolet light source emits light, irradiates the water area below, the light intensity sensor collects the light below the water surface, at the same time, the controller outputs a pulse to drive the motor to pull the light source to rotate left and right, the light source emits light once every time the light source rotates an angle, at the same time, the light intensity sensor collects the real-time light intensity; the control system collects the light intensity data each time and compares them, finds the position information, stores the position information, and repeats the above steps to confirm the position twice, and performs positioning in a smaller range; the real-time maximum light intensity is found, the light intensity is effectively utilized, and the photoelectric sensor obtains the maximum light intensity.

[0027] (3) According to the light path exit limit angle of the LED ultraviolet light source (the maximum angle appears at the edge of the light path without deviating from the monitoring range below), a travel switch is placed at the relative position of the light source, so that the LED light source can be controlled to not deviate from the irradiation range.

[0028] The real-time height data is obtained by detecting the real-time height through the infrared distance measuring sensor. The infrared sensor is used to monitor the distance from the equipment to the monitoring liquid surface in real time; the light intensity of the light source is automatically adjusted according to the distance. The system of the present application introduces a light collection system to collect the light intensity of the liquid surface below the sensor in real time, automatically adjusts the exit angle of the light source according to the light intensity, and through the collection and adjustment, combines the feedback system and algorithm, so that the exit light of the light source irradiates the sensor below in real time, and the light is fully utilized, the diffuse reflection on the liquid surface is changed into directional reflection, and the emitted light is more fully utilized, so that the sensitivity of the monitoring device is improved under the same power. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 is a distribution diagram of the light source and the sensor in the present application;

[0030] Fig. 2 is a schematic diagram of the light source transmission structure in the present application;

[0031] Fig. 3 is a deflection angle calculation schematic diagram.

[0032] In the figure: 1-ultraviolet light source, 2-fluorescent sensor, 3-distance sensor, 4-light intensity sensor, 5-oil spill monitoring equipment bottom surface, 6-motor, 7-main drive gear, 8-transmission gear, 9-light source lamp holder, 10-first transmission wheel, 11-second transmission wheel, 12-transmission belt, 13-travel switch, 14-fixed switch. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and examples. The accompanying drawings are attached. Figs. 1-3The drawings are simplified and are used only for the purpose of clearly and concisely illustrating the embodiments of the present application. The technical solutions shown in the drawings are specific solutions of the embodiments of the present application, and are not intended to limit the scope of the claimed application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of the present application.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0035] Embodiment one provides an automatic adjustment light source angle oil spill monitoring system, as shown in Fig. 1 and Fig. 2 , the oil spill monitoring system comprises an ultraviolet light source 1 arranged on the bottom surface 5 of the oil spill monitoring device, a light source adjusting mechanism, a fluorescent sensor 2, a distance sensor 3 and an illumination intensity sensor 4, the fluorescent sensor 2 is provided with two groups, the illumination intensity sensor 4 is located between the two fluorescent sensors 2, and the distance sensor 3 is located between the ultraviolet light source 1 and the illumination intensity sensor 4; the ultraviolet light source 1 and the two fluorescent sensors 2 are in an isosceles triangle distribution, the illumination intensity sensor 4 is located on the midline of the two fluorescent sensors 2, and the illumination intensity sensor 4 and the two fluorescent sensors 2 are on the same straight line; the distance sensor 3, the illumination intensity sensor 4 and the light source 1 are on a straight line, and the distance sensor 3 is located at the midpoint. The ultraviolet light source 1 uses an ultraviolet LED light source with a wave band of 300 nm. The light source adjusting mechanism comprises a motor 6 and a transmission mechanism, the transmission mechanism comprises a main drive gear 7 mounted on the output shaft of the motor 6, a transmission gear 8 engaged with the main drive gear 7 and a first transmission wheel 10 mounted on a light source lamp holder 9, a second transmission wheel 11 is coaxially connected on the rotating shaft of the transmission gear 8, and the first transmission wheel 10 and the second transmission wheel 11 are drivingly connected through a transmission belt 12. The motor 6 is a stepping motor, which is connected to a single-chip microcomputer MCU through a PWM circuit, and the output of the single-chip microcomputer controls the pulse output of the PWM, so as to control the running step size of the stepping motor, thereby accurately controlling the exit angle of the light source.

[0036] In the embodiment one, the oil spill monitoring system further comprises an MCU controller, signal output ends of the distance sensor 3, the fluorescence sensor 2 and the light intensity sensor 4 are connected with signal input ends of the MCU controller, a signal output end of the MCU controller is connected with control ends of the motor 5 and the ultraviolet light source 1. The oil spill monitoring system further comprises a travel switch 13, the ultraviolet light source 1 is sleeved with a fixed shell 14, and an ultraviolet light source lamp holder 9 is rotatably installed in the fixed shell 14, and the ultraviolet light source 1 can rotate in the fixed shell 14; the travel switch 13 is provided with two groups, and is symmetrically installed in inner walls of the fixed shells 14 on two sides of the ultraviolet light source 1, signal output ends of the travel switch 13 are connected with signal input ends of the MCU controller, and are used for limiting rotation of the ultraviolet light source 1. The distance sensor 3 is an infrared distance test sensor. Infrared light is emitted to a liquid surface, and the distance is automatically calculated by using a propagation speed of light in air and a receiving time. The fixed shell 14 is fixed, the travel switch 13 is installed on the shell, and a limiting effect is achieved, so that the ultraviolet light source 1 is prevented from abnormally rotating and touching other structural members or exceeding a monitoring range of light.

[0037] The MCU controller sends a PWM wave according to a signal detected by the sensor, the PWM wave is a pulse signal, the pulse signal drives the stepping motor 6 to rotate at a fixed amplitude, and the stepping motor 6 drags the main drive gear 7 to rotate, the main drive gear 7 meshes with the transmission gear 8, the transmission gear 8 is coaxial with the second transmission wheel 11, the second transmission wheel 11 is connected with the first transmission wheel 10 on the lamp holder of the ultraviolet light source 1 through the transmission belt 12, and the first transmission wheel 10 drives the ultraviolet light source to rotate at a small amplitude.

[0038] The specific process that the LED ultraviolet light source finds the maximum light intensity point in the application is as follows: the LED ultraviolet light source reaches the theoretical maximum light intensity point under the action of the single-chip microcomputer pulse signal, the light intensity sensor 4 collects the light at this moment, and it is assumed that the light intensity is 100 lux (lumen, light intensity unit); and the value 100 lux is stored into the storage as a reference value. The single-chip microcomputer sends out a PWM wave, and under the operation of the transmission system, the LED light source deflects 0.5° to the left, the light intensity sensor collects the light intensity at this moment, which is 98 lux, 100>98, and 98 is discarded. The LED light source continues to deflect 0.5° to the left under the instruction of the single-chip microcomputer, the light intensity sensor collects the LED light source irradiation intensity at this moment, which is 108 lux, the single-chip microcomputer compares the value 108 at this moment with the value in the storage, 108>100, the single-chip microcomputer stores the value 108 lux into the storage to replace 100 lux as a new reference value, and records the deflection angle at this moment. The LED continues to repeat the above steps to the left for 2 times, collects the values and judges, and finally finds that 108 is the maximum value. Then the LED light source returns to the theoretical maximum light intensity point, and then deflects to the right to repeat the above process, and finally obtains 108 lux as the maximum light intensity; the single-chip microcomputer sends out an instruction to find the 108 lux light intensity position according to the record in the storage, and sends out an instruction to drive the step motor by using the PWM wave, and finally stops the LED light source at the 108 lux light intensity point through the transmission system. The whole finding process is finished.

[0039] The automatic adjusting light source angle oil spill monitoring method provided in embodiment two is monitored by using the automatic adjusting light source angle oil spill monitoring system in embodiment one, and the specific steps are as follows:

[0040] S1. The ultraviolet light source, the fluorescent sensor, the distance sensor and the light intensity sensor are all installed on the bottom plate of the oil spill monitoring equipment, to ensure that the above components are in the same plane, and the two fluorescent sensors are symmetrically located and the plane is parallel to the monitored liquid surface;

[0041] S2. The distance between the bottom plate of the oil spill monitoring equipment and the monitored liquid surface, i.e. the distance H1 between the ultraviolet light source and the monitored liquid surface, is measured by the distance sensor, and then the theoretical best deflection angle a of the ultraviolet light source is calculated according to the distance L between the distance sensor and the ultraviolet light source, and the calculation process is as follows:

[0042] tan a = L / H1

[0043] a = arctan (L / H1) ;

[0044] S3. The MCU controller drives the stepper motor to rotate according to the theoretical optimal deflection angle a of the ultraviolet light source calculated in step S2, so that the emission angle of the ultraviolet light source reaches the theoretical optimal deflection angle a. The travel switch limits the position of the ultraviolet light source during rotation to ensure that the ultraviolet light source does not deviate from the irradiation range. The specific process is as follows: according to the calculated angle, an instruction is sent; according to the number of pulses and the corresponding deflection angle, the single deflection angle is assumed to be β according to the settings of the stepper motor, and the number of pulses is a / β; the stepper motor is driven to rotate, so that the emission angle of the light source reaches the theoretical deflection angle a.

[0045] S4. When the emission angle of the ultraviolet light source reaches the theoretical optimal deflection angle a, the ultraviolet light source is turned on, and the light source emits light periodically. The real-time light intensity is collected by the light intensity sensor, and the average light intensity at this moment is stored as the original reference data A. Then, based on the deflection angle a, the ultraviolet light source is controlled to rotate left and right to find a larger light intensity point. The angle of rotation is 0.5° each time, and the maximum angle of rotation on each side is controlled to be 2-3°. First, the ultraviolet light source is controlled to rotate towards one side based on the deflection angle a. The light intensity sensor collects the real-time light intensity at the same time, and compares it with the original reference data A. When a larger light intensity than the original reference data A appears, the light intensity collected at this moment replaces the original reference data A as the new reference data A. ， At the same time, the MCU controller records the deflection angle of the ultraviolet light source at this moment. If there is no larger light intensity than the original reference data A in this interval, the device still uses the original reference data A as the reference data. When the rotation on one side reaches 2-3°, the ultraviolet light source is controlled to return to the original deflection angle a, and then rotates towards the other side based on the deflection angle a. The increment is 0.5°, and the same method is used to find a larger light intensity point. During the left and right rotation, after finding the maximum light intensity point, the ultraviolet light source is controlled to remain in the same position to monitor the oil spill on the water surface.

[0046] S5. After adjusting the emission angle of the ultraviolet light source, the ultraviolet light source generates fluorescence to the water surface, and the fluorescence excited by the ultraviolet light source is received by the fluorescence sensor to monitor the oil spill on the water surface; during the monitoring process, the distance between the oil spill monitoring equipment and the monitored liquid surface is monitored in real time by the distance sensor, and when the distance between the oil spill monitoring equipment and the monitored liquid surface changes, a new theoretical best deflection angle a' is calculated according to the changed distance H1' between the oil spill monitoring equipment and the monitored liquid surface according to the above formula ①, and the MCU controller drives the motor to rotate according to the calculated new theoretical best deflection angle a', so that the emission angle of the ultraviolet light source reaches the deflection angle a'; and the step S4 is repeated to control the ultraviolet light source to rotate left and right on the basis of the deflection angle a' to find a larger light intensity point, and after finding the maximum light intensity point, the ultraviolet light source is controlled to remain unchanged to monitor the oil spill on the water surface.

[0047] After the application is specifically installed at the bottom of the monitoring equipment, a hole can be opened below the equipment according to the distance detected by the equipment, one of which is an exit hole of the LED ultraviolet light source, and the other two are located on one side of the light source hole for ultraviolet light reflection and light collection, and the three holes are distributed in an isosceles triangle; a small hole is opened at the midpoint between the ultraviolet light collection holes for placing an infrared distance sensor probe.

[0048] When the application is specifically used, the equipment is installed on site, the equipment is powered on, the distance sensor 3 emits infrared light, and according to the propagation speed of light and the time difference between emission and reception, the vertical distance from the equipment to the liquid surface is calculated. According to the straight-line distance from the ultraviolet light source to the infrared distance sensor determined in advance, the deflection angle of the light source irradiating the ultraviolet receiving sensor directly below is obtained through the algorithm set by the single-chip microcomputer. According to this theoretical deflection angle, the single-chip microcomputer sends a pulse to the PWM circuit to send a signal, and the PWM circuit drives the stepping motor to start rotating. In theory, the position of the light source light irradiating the sensor directly below is found, and the light intensity at this moment is stored by the light sensor. Through the above-mentioned mode, the position of the LED light source seeking the best light-emitting point is first determined within a certain range. The next operation is performed within this range, so that the best position is not particularly blind and purposeless.

[0049] The present application adopts infrared distance sensor to monitor the distance between the equipment and the liquid surface in real time, and automatically adjusts the light intensity of LED ultraviolet light source according to the distance. The infrared distance sensor detects the liquid level in real time, and the height information is sent to the MCU single chip microcomputer. The MCU single chip microcomputer controls the current output of the LED driving power supply through the enable terminal, so as to adjust the output current of the LED driving power supply, and then adjust the power of the LED, so as to adjust the illumination of the LED light source. Under normal circumstances, the closer to the liquid surface, the smaller the illumination of the LED light source, the farther to the liquid surface, the larger the illumination of the LED light source, so as to increase the illumination of the light source, and make the sensor get the maximum light intensity from the light source.

[0050] The above is only one embodiment of the present application, which is described in more detail and in detail, but cannot be understood as a limitation on the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An automatic light source angle adjustment oil spill monitoring system, characterized in that: The oil spill monitoring system includes an ultraviolet light source (1) installed on the bottom surface (5) of the oil spill monitoring equipment, a light source adjustment mechanism, a fluorescence sensor (2), a distance sensor (3) and a light intensity sensor (4). The fluorescence sensor (2) is provided in two sets, the light intensity sensor (4) is located between the two fluorescence sensors (2), and the distance sensor (3) is located between the ultraviolet light source (1) and the light intensity sensor (4). The light source adjustment mechanism includes a motor (6) and a transmission mechanism. The transmission mechanism includes a main drive gear (7) mounted on the output shaft of the motor (6), a transmission gear (8) meshing with the main drive gear (7), and a first transmission wheel (10) mounted on the light source holder (9). A second transmission wheel (11) is coaxially connected to the shaft of the transmission gear (8). The first transmission wheel (10) and the second transmission wheel (11) are connected by a transmission belt (12). The oil spill monitoring system also includes an MCU controller. The signal output terminals of the distance sensor (3), fluorescence sensor (2) and light intensity sensor (4) are all connected to the signal input terminal of the MCU controller. The signal output terminal of the MCU controller is connected to the control terminal of the motor (5) and the ultraviolet light source (1).

2. The automatic adjustment light source angle oil spill monitoring system according to claim 1, characterized in that: The light source (1) and the two fluorescence sensors (2) are arranged in an isosceles triangle. The light intensity sensor (4) is located on the midline of the two fluorescence sensors (2), and the light intensity sensor (4) and the two fluorescence sensors (2) are on the same straight line. The distance sensor (3), the light intensity sensor (4) and the ultraviolet light source (1) are on a straight line, and the distance sensor (3) is located at the midpoint.

3. The automatic adjustment light source angle oil spill monitoring system according to claim 2, characterized in that: The oil spill monitoring system also includes limit switches (13). The ultraviolet light source (1) is covered with a fixed housing (14), and the ultraviolet light source lamp holder (9) is rotatably installed inside the fixed housing (14). The ultraviolet light source (1) can rotate inside the fixed housing (14). There are two sets of limit switches (13), which are symmetrically installed on the inner walls of the fixed housing (14) on both sides of the ultraviolet light source (1). The signal output terminals of the limit switches (13) are all connected to the signal input terminals of the MCU controller to limit the rotation of the ultraviolet light source (1).

4. The automatic adjustment light source angle oil spill monitoring system according to claim 2, characterized in that: The ultraviolet light source (1) is an LED ultraviolet light source with a wavelength of 300nm.

5. The automatic adjustment light source angle oil spill monitoring system according to claim 2, characterized in that: The distance sensor (3) is an infrared distance test sensor; it emits infrared light to the liquid surface and automatically calculates the output distance by utilizing the speed of light propagation in the air and the reception time.

6. A method for automatically adjusting the angle of a light source to monitor oil spillage, characterized in that... The specific steps of using the automatic light source angle adjustment oil spill monitoring system as described in claims 2 to 5 are as follows: S1. Install the ultraviolet light source, fluorescence sensor, distance sensor and light intensity sensor onto the base plate of the oil spill monitoring equipment, ensuring that the above components are on the same plane, the two fluorescence sensors are symmetrically located and the plane is parallel to the monitored liquid surface; S2. Measure the distance between the base plate of the oil spill monitoring device and the monitored liquid surface using a distance sensor, i.e., the distance H1 between the ultraviolet light source and the monitored liquid surface. Then, based on the distance L between the distance sensor and the ultraviolet light source, calculate the theoretical optimal deflection angle α of the ultraviolet light source. The calculation process is as follows: tanα=L / H1 α = arctan(L / H1); ① S3. The MCU controller calculates the theoretical optimal deflection angle α of the ultraviolet light source according to formula ① in step S2, and drives the stepper motor to rotate so that the emission angle of the ultraviolet light source reaches the theoretical optimal deflection angle α. S4. After adjusting the emission angle of the ultraviolet light source, the ultraviolet light source generates fluorescence to the water surface. The fluorescence excited by the ultraviolet light source is received by the fluorescence sensor to monitor the oil spill situation on the water surface. During the monitoring process, the distance between the oil spill monitoring device and the monitored liquid surface is monitored in real time by the distance sensor. When the distance between the monitoring device and the monitored liquid surface changes, the new theoretical optimal deflection angle α' is calculated according to the above formula ① based on the changed distance H1' between the monitoring device and the monitored liquid surface. The MCU controller drives the motor to rotate according to the calculated new theoretical optimal deflection angle α', so that the emission angle of the ultraviolet light source reaches the deflection angle α'.

7. The method for automatically adjusting the light source angle to monitor oil spillage according to claim 6, characterized in that: In step S3, when the emission angle of the ultraviolet light source reaches the theoretical optimal deflection angle α, the ultraviolet light source is turned on and emits light periodically. The real-time light intensity is collected by the light intensity sensor, and the average light intensity at this moment is stored as the original reference data A. Then, the ultraviolet light source is controlled to rotate left and right at a deflection angle α to find a point with greater light intensity, rotating at an angle of 0.5° each time, with the maximum rotation angle on each side controlled between 2 and 3°. First, the ultraviolet light source is controlled to rotate towards one side at a deflection angle α. Simultaneously, the light intensity sensor collects real-time light intensity data and compares it with the original reference data A. When a light intensity greater than the original reference data A is found, the collected light intensity at that moment replaces the original reference data A and becomes the new reference data A. ， Meanwhile, the MCU controller records the deflection angle of the ultraviolet light source at this moment. If there is no greater light intensity than the original reference data A within this range, the device will still use the original reference data A as the reference data. When the device rotates to 2-3° on one side, it controls the ultraviolet light source to return to the original theoretical optimal deflection angle α, and rotates to the other side based on the deflection angle α, in increments of 0.5°, using the same method to find a point with greater light intensity. During the left and right rotation, after finding the point with the maximum light intensity, the device controls the ultraviolet light source to keep its position unchanged and monitors the oil spill situation on the water surface.

8. The method for automatically adjusting the light source angle to monitor oil spillage according to claim 6 or 7, characterized in that: In step S3, the ultraviolet light source is limited by a limit switch during rotation to ensure that the ultraviolet light source does not leave the irradiation range.

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