CN110487738B - LED ultraviolet oil film monitoring equipment and oil spill monitoring method - Google Patents

Abstract

The invention discloses an LED ultraviolet oil film monitoring device and an oil spill monitoring method. The monitoring device comprises an LED light source module, a monitoring module, a comparison module, a signal processing module and a power supply module. The LED light source module, the monitoring module and the comparison module are respectively connected with the signal processing module. The modules are connected, and the power module is respectively connected with the LED light source module and the signal processing module; the LED light source module emits ultraviolet light to illuminate the water surface, and the monitoring module and the comparison module detect the water surface signal in the illuminated area of the LED light source module, and the monitoring module and the comparison module have different Spectral response channel of frequency; the monitoring module monitors UV reflection light and UV fluorescence, and the comparison module monitors UV fluorescence; the combination technology of UV reflection and UV fluorescence is adopted to improve monitoring sensitivity and reduce false alarm rate through relative threshold setting and oil spill monitoring algorithm , reduce the impact of external environmental changes on the equipment, realize the non-contact monitoring of the oil film on the water surface, and detect oil spills in time.

Description

A kind of LED ultraviolet oil film monitoring equipment and oil spill monitoring method

technical field

The invention belongs to the technical field of chemical safety, and particularly relates to an LED ultraviolet oil film monitoring device and an oil spill monitoring method.

Background technique

With the development of oil production and transportation activities, various oil spill accidents are increasing day by day, which not only causes huge economic losses, but also causes serious water pollution and ecological impact. With the whole society's emphasis on environmental protection and the rapid development of the industry, the environmental protection pressure of government supervision departments and production and sales enterprises is increasing. Advanced oil spill monitoring equipment and effective emergency plans are important means to reduce oil spill risks. Due to the unpredictability of oil spills, the first detection of oil spills is the most effective way to prevent and control oil spills.

In the oil spill monitoring technology, the fixed-point oil spill monitoring technology has the characteristics of low cost and small range, and forms an effective complement to the high cost and large-scale oil spill monitoring technologies such as satellite and radar. It is a kind of oil spill monitoring technology with wide application value. . Among them, UV fluorescence monitoring is the main fixed-point monitoring technology, and UV reflection monitoring also has application examples.

Existing ultraviolet fluorescent oil spill monitoring technology mostly uses xenon lamp as the excitation light source, and judges whether oil spill occurs through the threshold value change of the absolute value of the signal intensity, which makes such instruments have four problems: 1. Because the fluorescent signal itself is relatively weak. Weak, the signal-to-noise ratio of the signal collected in the open-circuit environment is low, which affects the sensitivity of the instrument; 2. The threshold of the instrument is determined by the absolute change value, and changes in the external environment (such as water level changes) will cause the set threshold to fail and cannot be accurately determined. Oil spill situation; 3. The principle of fluorescent light emission determines that the fluorescent technology is not sensitive to light oil products, and there are few types of oil to be monitored; 4. The life of the light source is short and the equipment cost is high.

The main problems of the existing ultraviolet reflection oil spill monitoring technology are low monitoring specificity, easy to be affected by external debris and environmental conditions, and high monitoring false alarm rate.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the present invention provides an LED ultraviolet oil film monitoring device and an oil spill monitoring method, which utilizes LED as a light source, adopts the combined technology of ultraviolet reflection and ultraviolet fluorescence, and through relative threshold setting and oil spill monitoring algorithm, improves the Monitoring sensitivity, reducing false alarm rate, reducing the impact of external environmental changes on equipment, realizing non-contact monitoring of oil film on water surface, timely detection of oil spill events, and issuing an alarm at the first time.

In order to solve the above technical problems, the technical solution adopted in the present invention is: an LED ultraviolet oil film monitoring equipment, comprising an LED light source module, a monitoring module, a comparison module, a signal processing module and a power supply module, the LED light source module, the monitoring module, the comparison module The modules are respectively connected with the signal processing module, and the power module is respectively connected with the LED light source module and the signal processing module; the LED light source module emits ultraviolet light to illuminate the water surface, and the monitoring module and the comparison module detect the water surface signal in the illuminated area of the LED light source module, The monitoring module and the comparison module have spectral response channels with different frequencies; the monitoring module monitors UV reflected light and UV fluorescence, and the comparison module monitors UV fluorescence.

Further, the LED light source module includes LED lamp particles and a condensing cup, and the light emitted by the LED lamp particles is collected by the condensing cup, and the spectral range is 200-400 nm.

Further, the monitoring module includes a first condensing mirror, a first optical filter, and a first photodetector for converting the optical signal into an electrical signal, and the spectral range is 200-600 nm.

Further, the comparison module includes a second condensing mirror, a second filter, and a second photodetector for converting the optical signal into an electrical signal, and the spectral range is 400-600 nm.

Further, the signal processing module includes a single-chip microcomputer or a DSP, and also includes an LED light source control module, a signal operational amplifier conversion module, a data operation processing module and a data interface, and the power supply module includes a circuit power supply and an LED driving power supply, and the LED light source control module. Connect the LED driving power supply to control the emission frequency of the light source; the signal op amp conversion module receives the electrical signals emitted by the monitoring module and the comparison module, and through the op amp and A/D conversion, amplifies the signal and outputs the digital signal; the data operation processing module monitors the oil spill through the The algorithm calculates whether there is an oil spill, and transmits it to the host computer in real time through the data interface.

Further, the first filter and the second filter are both bandpass filters.

An oil spill monitoring method, implemented based on the aforementioned LED ultraviolet oil film monitoring equipment, includes the following steps:

a. The LED light source module emits ultraviolet light to illuminate the water surface; the monitoring module receives the ultraviolet reflection signal and the fluorescence signal based on the principle of ultraviolet reflection and fluorescence to obtain signal A; the comparison module receives the excited fluorescence signal based on the principle of ultraviolet fluorescence to obtain signal B; Add the signals of the two channels to obtain the enhanced signal (A+B), and subtract the signals of the two channels to obtain the reference signal (A-B);

b. Set fluorescence threshold 1 and reflection threshold 2 respectively;

c. Calculate the R value according to the formula R=(A+B)/(A-B), and judge the oil film condition on the water surface by the signal ratio R and the set fluorescence threshold value 1;

d. Set the difference ΔA of the reflected signals monitored at two moments, ΔA=A ₂ -A ₁ , wherein the signal A ₁ is monitored in the first monitoring period, and the signal A ₂ is monitored in the second monitoring period; ΔA and the set The reflection threshold 2 is compared to judge the oil film condition on the water surface;

e. Set up oil spill monitoring algorithms A and B in different environments;

Algorithm A: During the sampling period, if R>threshold 1 or ΔA>threshold 2 occurs, enter the delay monitoring period; in the delay monitoring period, encrypt sampling 3 times, if all 3 times satisfy R>threshold 1 or ΔA> Threshold 2, alarm, and end the delay monitoring period; if R>threshold 1 or ΔA>threshold 2 cannot be satisfied all three times, no alarm and end the delay monitoring period;

Algorithm B: During the sampling period, if R>threshold 1 and ΔA>threshold 2 appear, enter the delay monitoring period; in the delay monitoring period, encrypt sampling 3 times, if all 3 times satisfy R>threshold 1 and ΔA> Threshold 2, alarm, and end the delay monitoring cycle; if R>threshold 1 and ΔA>threshold 2 cannot be satisfied for all 3 times, no alarm, cycle delay monitoring cycle 3 times; cycle monitoring cycle does not alarm, end delay monitoring cycle.

Further, connect the LED ultraviolet oil film monitoring equipment with the sound and light alarm, CCTV camera or emergency control valve, and realize respectively in the case of judging the occurrence of oil spill: start the sound and light alarm to alert the on-site staff, and start the CCTV camera for further judgment. In case of oil spill, activate the control valve to prevent the oil spill from spreading.

Further, the LED UV oil film monitoring equipment is connected to the monitoring system through wired or wireless communication. The monitoring system can be connected to multiple LED UV oil film monitoring equipment to form a network, and can also integrate water flow, wind and tide sensors to form a continuous, real-time, Large-scale, three-dimensional monitoring area; the monitoring system can integrate environmental sensitive point information and emergency resource information in the monitoring area, and realize dynamic management of information.

Further, the monitoring system is equipped with an electronic map display, which displays the monitoring equipment and various sensors on the electronic map, and provides monitoring data in real time; once an oil spill occurs, the staff can use the monitoring system to observe the situation of each monitoring point in real time. , combined with environmental sensitive points and emergency resources, formulate targeted strategies for emergency rescuers, and provide emergency strategy information support.

Compared with the prior art, the advantages of the present invention are:

1. Improve the sensitivity of the monitor and expand the range of monitored oil types;

2. The equipment can use the reflection principle and the fluorescence principle to monitor the oil film at the same time. The detection results of the monitoring module and the comparison module are compared with the fluorescence threshold 1 and the reflection threshold 2 after calculation, and the results can be verified with each other. False alarm rate, reduce the impact of external debris and environmental changes on the instrument;

3. Extend product life, reduce instrument energy consumption, and reduce processing costs;

4. The monitoring system can integrate multiple LED UV oil film monitoring equipment and other equipment such as water flow, wind and tide sensors in the monitoring area, as well as environmental sensitive point information and emergency resource information in the monitoring area, and realize dynamic management of information; The staff can use the monitoring system to observe the situation of each monitoring point in real time, which is convenient to formulate targeted strategies for emergency rescuers.

Description of drawings

FIG. 1 is a schematic structural diagram of the LED ultraviolet oil film monitoring equipment of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, the LED ultraviolet oil film monitoring equipment of the present invention comprises an LED light source module, a monitoring module, a comparison module, a signal processing module and a power supply module, and the LED light source module, the monitoring module and the comparison module are respectively connected with the signal processing module, and the power supply The modules are respectively connected with the LED light source module and the signal processing module; the LED light source module emits ultraviolet light to illuminate the water surface, the monitoring module and the comparison module detect the water surface signal in the illuminated area of the LED light source module, and the monitoring module and the comparison module have spectral response channels of different frequencies; The monitoring module monitors UV reflected light and UV fluorescence, and the comparison module monitors UV fluorescence.

The LED light source module includes LED lamp particles and a condensing cup. The light emitted by the LED lamp particles is collected by the condensing cup, and the spectral range is 200-400 nm; the monitoring module includes a first condensing mirror, a first filter and a light signal The first photodetector converted into electrical signals has a spectral range of 200-600nm; the contrast module includes a second condensing mirror, a second filter and a second photodetector for converting optical signals into electrical signals, with a spectral range is 400-600nm; both the first filter and the second filter are bandpass filters.

The signal processing module includes a single-chip microcomputer or DSP, and also includes an LED light source control module, a signal operational amplifier conversion module, a data operation processing module and a data interface. The power module includes a circuit power supply and an LED driving power supply. The LED driving power supply is connected to the LED light source module, and the circuit power supply is connected The signal processing module supplies power for both, and the power module is controlled by the signal processing module to adjust the pulse signal of the LED lamp particles. The power module can be powered by 220V AC, ±12V DC, ±24V DC, adapting to the power supply conditions of various places.

The LED light source control module is connected to the LED driving power supply to control the emission frequency of the light source; the signal op-amp conversion module receives the electrical signals emitted by the monitoring module and the comparison module, and through the op-amp and A/D conversion, amplifies the signal and outputs the digital signal; the data operation processing module Through the oil spill monitoring algorithm, it calculates whether there is oil spill, and transmits it to the host computer in real time through the data interface.

The invention also discloses an oil spill monitoring method, which is realized based on the aforementioned LED ultraviolet oil film monitoring equipment, and includes the following steps:

a. The LED light source module of the LED ultraviolet oil film monitoring equipment emits ultraviolet light and illuminates the water surface; the monitoring module receives the ultraviolet reflection signal and the fluorescence signal based on the principle of ultraviolet reflection and fluorescence to obtain signal A; the comparison module receives the excited fluorescence signal based on the principle of ultraviolet fluorescence and obtains the signal A. Signal B; the enhanced signal (A+B) is obtained by adding the two signals, and the reference signal (A-B) is obtained by subtracting the two signals;

b. Set fluorescence threshold 1 and reflection threshold 2 respectively;

c. Calculate the R value according to the formula R=(A+B)/(A-B), which enhances the received signal and removes certain environmental influences; judge the oil film condition on the water surface by the signal ratio R and the set fluorescence threshold 1;

d. Set the difference ΔA of the reflected signals monitored at two moments, ΔA=A ₂ -A ₁ , in which the signal A1 is monitored in the first monitoring period, and the signal A ₂ is monitored in the second monitoring period; ΔA and the set reflection Threshold 2 for comparison, and then judge the oil film condition on the water surface;

e. Set up oil spill monitoring algorithms A and B in different environments;

Algorithm A: During the sampling period, if R>threshold 1 or ΔA>threshold 2 occurs, enter the delay monitoring period; in the delay monitoring period, encrypt sampling 3 times, if all 3 times satisfy R>threshold 1 or ΔA> Threshold 2, alarm, and end the delay monitoring period; if R>threshold 1 or ΔA>threshold 2 cannot be satisfied all three times, no alarm and end the delay monitoring period;

Algorithm B: During the sampling period, if R>threshold 1 and ΔA>threshold 2 appear, enter the delay monitoring period; in the delay monitoring period, encrypt sampling 3 times, if all 3 times satisfy R>threshold 1 and ΔA> Threshold 2, alarm, and end the delay monitoring cycle; if R>threshold 1 and ΔA>threshold 2 cannot be satisfied for all 3 times, no alarm, cycle delay monitoring cycle 3 times; cycle monitoring cycle does not alarm, end delay monitoring cycle.

Connect the LED ultraviolet oil film monitoring equipment with the sound and light alarm, CCTV camera or emergency control valve, and realize respectively in the case of determining the occurrence of oil spill: start the sound and light alarm to alert the on-site staff, and start the CCTV camera to further determine the oil spill situation , start the control valve to prevent the spread of oil spill.

Connect the LED UV oil film monitoring equipment to the monitoring system through wired or wireless communication. The monitoring system can be connected to multiple LED UV oil film monitoring equipment to form a network, and can also integrate water flow, wind and tide sensors to form a continuous, real-time, large-scale, Three-dimensional monitoring area; the monitoring system can integrate the environmental sensitive point information and emergency resource information of the monitoring area, and realize the dynamic management of information.

The monitoring system is equipped with an electronic map display, which displays the monitoring equipment and various sensors on the electronic map, and provides monitoring data in real time; once an oil spill occurs, the staff can use the monitoring system to observe the situation of each monitoring point in real time, combined with the environment Sensitive points and emergency resources, formulate targeted strategies for emergency rescuers, and provide emergency strategy information support.

Example 1:

The equipment of the present invention is installed on the upper part of the rainwater pool of an oil depot. The pool is made of cement, with a depth of 2.5 meters and a width of 1.5 meters. Water flows through the pool. The installation height of the equipment is 2.5 meters from the water surface. The crude oil of cm ³ simulates oil spill, and a small amount of crude oil drips into the water surface. When the oil film flows through the monitoring area of the device, the device outputs an oil spill signal, and the sound and light alarm connected to the device alarms.

Example 2:

The equipment of the present invention is installed on a berth of a certain wharf, the installation height of the equipment is 3 meters from the sea surface, a floating open water bag is placed in the equipment monitoring area, and a small amount of crude oil is dropped into the water bag. The sound and light alarm connected to the equipment will alarm.

Example 3:

The device of the present invention is installed on the upper part of the clean drainage channel of a certain production plant. The channel is made of cement, with a depth of 1.5 meters and a width of 1.1 meters. Water flows through the channel. The installation height of the device is 1 meter from the water surface. 0.85g/cm ³ diesel oil simulates oil spill. A small amount of diesel oil drips into the water surface. When the oil film flows through the monitoring area of the device, the device outputs an oil spill signal, and the sound and light alarm connected to the device alarms.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Those of ordinary skill in the art, within the scope of the present invention, make changes, modifications, additions or substitutions. It belongs to the protection scope of the present invention.

Claims (2)

1. an oil spill monitoring method, is characterized in that, comprises the following steps: a. The LED light source module emits ultraviolet light to illuminate the water surface; the monitoring module receives the ultraviolet reflection signal and the fluorescence signal based on the principle of ultraviolet reflection and fluorescence to obtain signal A; the comparison module receives the excited fluorescence signal based on the principle of ultraviolet fluorescence to obtain signal B; Add the signals of the two channels to obtain the enhanced signal (A+B), and subtract the signals of the two channels to obtain the reference signal (A-B); b. Set fluorescence threshold 1 and reflection threshold 2 respectively; c. According to the formula R=(A+B)/(A-B), calculate the R value, and judge the oil film condition on the water surface by the signal ratio R and the set fluorescence threshold value 1; d. Set the difference ΔA of the reflected signals monitored at two moments, ΔA=A ₂ -A ₁ , wherein the signal A ₁ is monitored in the first monitoring period, and the signal A ₂ is monitored in the second monitoring period; ΔA and the set The reflection threshold 2 is compared to judge the oil film condition on the water surface; e. Set up oil spill monitoring algorithms A and B in different environments; Algorithm A: During the sampling period, if R>threshold 1 or ΔA>threshold 2 occurs, enter the delay monitoring period; in the delay monitoring period, encrypt sampling 3 times, if all 3 times satisfy R>threshold 1 or ΔA> Threshold 2, alarm, and end the delay monitoring period; if R>threshold 1 or ΔA>threshold 2 cannot be satisfied all three times, no alarm and end the delay monitoring period; Algorithm B: During the sampling period, if R>threshold 1 and ΔA>threshold 2 appear, enter the delay monitoring period; in the delay monitoring period, encrypt sampling 3 times, if all 3 times satisfy R>threshold 1 and ΔA> Threshold 2, alarm, and end the delay monitoring cycle; if R>threshold 1 and ΔA>threshold 2 cannot be satisfied for all 3 times, no alarm, cycle delay monitoring cycle 3 times; cycle monitoring cycle does not alarm, end delay monitoring cycle; Connect the LED ultraviolet oil film monitoring equipment with the sound and light alarm, CCTV camera or emergency control valve, and realize respectively in the case of determining the occurrence of oil spill: start the sound and light alarm to alert the on-site staff, and start the CCTV camera to further determine the oil spill situation , start the control valve to prevent the spread of oil spill; Connect the LED UV oil film monitoring equipment to the monitoring system through wired or wireless communication. The monitoring system can be connected to multiple LED UV oil film monitoring equipment to form a network, and can also integrate water flow, wind and tide sensors to form a continuous, real-time, large-scale, Three-dimensional monitoring area; the monitoring system can integrate the environmental sensitive point information and emergency resource information of the monitoring area, and realize the dynamic management of information; The monitoring system is equipped with an electronic map display, which displays the monitoring equipment and various sensors on the electronic map, and provides monitoring data in real time; once an oil spill occurs, the staff can use the monitoring system to observe the situation of each monitoring point in real time, combined with the environment Sensitive points and emergency resources, formulate targeted strategies for emergency rescuers, and provide emergency strategy information support. 2. a kind of LED ultraviolet oil film monitoring equipment used in the oil spill monitoring method according to claim 1, is characterized in that: comprises LED light source module, monitoring module, contrast module, signal processing module and power module, described LED light source module , the monitoring module and the comparison module are respectively connected with the signal processing module, and the power module is respectively connected with the LED light source module and the signal processing module; the LED light source module emits ultraviolet light to illuminate the water surface, and the monitoring module and the comparison module detect the LED light source module irradiated For regional water surface signals, the monitoring module and the comparison module have spectral response channels with different frequencies; the monitoring module monitors UV reflected light and UV fluorescence, and the comparison module monitors UV fluorescence; The LED light source module includes LED lamp particles and a condensing cup, the light emitted by the LED lamp particles is collected by the condensing cup, and the spectral range is 200-400 nm; The monitoring module includes a first condensing mirror, a first filter, and a first photodetector for converting optical signals into electrical signals, with a spectral range of 200-600 nm; The contrast module includes a second condensing mirror, a second filter, and a second photodetector for converting optical signals into electrical signals, with a spectral range of 400-600 nm; The signal processing module includes a single-chip microcomputer or a DSP, and also includes an LED light source control module, a signal operational amplifier conversion module, a data operation processing module and a data interface; the power module includes a circuit power supply and an LED driving power supply, and the LED light source control module is connected to the LED driver. The power supply controls the emission frequency of the light source; the signal op amp conversion module receives the electrical signals emitted by the monitoring module and the comparison module, and through the op amp and A/D conversion, amplifies the signal and outputs a digital signal; the data operation processing module calculates through the oil spill monitoring algorithm Whether there is an oil spill, it will be transmitted to the host computer in real time through the data interface; The first filter and the second filter are both bandpass filters.

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