CN105388134A - Fluorescence signal enhanced distance-self-adaptation oil spilling monitoring method - Google Patents
Fluorescence signal enhanced distance-self-adaptation oil spilling monitoring method Download PDFInfo
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- CN105388134A CN105388134A CN201510680657.1A CN201510680657A CN105388134A CN 105388134 A CN105388134 A CN 105388134A CN 201510680657 A CN201510680657 A CN 201510680657A CN 105388134 A CN105388134 A CN 105388134A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6491—Measuring fluorescence and transmission; Correcting inner filter effect
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Abstract
The invention discloses a fluorescence signal enhanced distance-self-adaptation oil spilling monitoring method. A wide-spectrum light source is adopted, wide- spectrum light beams emitted by the wide-spectrum light source are filtered through an optical fiber, and wide-spectrum ultraviolet light and a part of infrared spectrums are obtained; the wide-spectrum ultraviolet light and the infrared spectrums are projected to a monitored water surface area through an emission convergent mirror, signals are received through two channels, and the signals of the two channels are calculated after being processed to judge whether an oil film exists on the water surface or not. The method has the advantages that an ultraviolet induction fluorescent method is adopted for non-contact monitoring, samples do not need to be collected for chemical reactions, and accordingly secondary pollution is avoided. Meanwhile, the signals are received through the two channels including the infrared channel, so that the collected fluorescent signals are enhanced and can self-adapt to distance changes. The method has the advantages of being high in environment adaptability, high in sensitivity, simple in structure and low in cost.
Description
Technical field
The present invention relates to a kind of distance self-adaptation spilled oil monitoring method that fluorescence signal strengthens, belong to spilled oil monitoring equipment technical field.
Background technology
In recent years, the oil spill accident that offshore oil exploiting platform and petroleum transportation cause frequently occurs, serious harm and have impact on the productive life of the marine eco-environment and the littoral mankind.As the useful supplement of satellite/aerial remote sensing spilled oil monitoring technology, water-surface oil film based on foundation platform monitors and monitoring equipment can be fixedly installed in locality, by to carrying out emphasis supervision among a small circle, the small-sized oil spill events of energy Timeliness coverage, and send a warning in the very first time, to the timely process of oil spill accident, reduce causality loss and serve good forewarning function.The existing water-surface oil film based on foundation platform monitors and monitoring equipment, the principle of many employings uv induction oil fluorescence carries out spilled oil monitoring, adopt Ultra-Violet Laser or pulse xenon lamp or LED as excitation source, adopt photodetector to carry out signals collecting, determine whether oil spilling occurs by carrying out threshold decision to signal intensity.
This quasi-instrument runs into two class problems in actual use usually:
1. because fluorescence signal itself is more weak, the Signal-to-Noise of collection is low, have impact on precision and the detection limit of instrument;
2. existing equipment often can not the change of self-adaptive detection distance, when tide or external environment change cause monitoring distance to change, monitor signal strength can obviously change, thus the threshold value of earlier set was lost efficacy, and can not be correct judge whether there occurs oil spilling.
Therefore, the monitoring place that monitoring of environmental complexity, detection range are changeable can not be applicable to well.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of distance self-adaptation spilled oil monitoring method that fluorescence signal strengthens, by by infrared channel, the impact of distance change on signal processing results can not only be overcome, and newly-increased passage also makes fluorescence signal be enhanced.
Object of the present invention carrys out specific implementation by the following technical programs:
A kind of distance self-adaptation spilled oil monitoring method that fluorescence signal strengthens, adopt broad spectrum light source, the broad-spectrum beam that broad spectrum light source sends obtains wide spectral ultraviolet light and a part of infrared spectrum after optical filter filters, monitored water-surface areas is projected by transmitting convergent mirror, two paths is adopted to receive signal, wherein the fluorescence signal of first via channel reception stimulated emission obtains signal A, the infrared signal that second paths receives in the fluorescence signal of stimulated emission and water-reflected excitation beam simultaneously obtains signal B, by two paths of signals being added the fluorescence signal (A+B) obtaining and strengthen, two paths of signals is subtracted each other and obtains infrared signal as reference signal (B-A), the fluorescence signal of enhancing and reference signal are asked the change of ratio erasure signal intensity distance, by whether having oil film to exist to the signal ratio setting threshold decision water surface.
Two paths signal intensity all contains the decay factor with distance, i.e. square being inversely proportional to of signal intensity and distance.
Calculate
whether occur by arranging threshold decision oil spilling to the signal S calculated.
Also comprise, to the process of two paths signal A, B, comprise broad spectrum light source, by pulse modulation control circuit, transmitting illuminant is modulated to certain high-frequency signal, the receiving signal demodulation circuit of two passages by the receiving signal demodulation with transmitting illuminant Strength Changes out, by high frequency modulated and the demodulation of signal, and then the impact of filtering environmental light.
Receiving belt pass filter in described first via passage is ultraviolet light receiving belt pass filter, and channel spectral range covers 400nm-600nm.
Reception optical filter in described second paths contains two passbands simultaneously, comprises the IR pass band that the fluorescence passband of the fluorescence reception bandpass filter identical with passage one and spectral range cover 850-1100nm.
Be respectively equipped with photodetector in two paths, light signal is converted to electric signal by photodetector, and through current/voltage-converted, enlarge leadingly and signal receiving.
Described photodetector is set to large face battle array silicon photoelectric diode.
The light beam that the light beam that broad spectrum light source sends is launched after the optical filtering of bandpass filter comprises two passbands, and one is the ultraviolet wide spectral passband covering 200-400nm spectral range, and one is the IR pass band of passband within the scope of 850nm-1100nm.
The invention has the beneficial effects as follows and adopt UV light-induced fluorescent method, non-contact monitoring, collected specimens is not needed to carry out chemical reaction, avoid secondary pollution, adopt the dual channel receiver signal containing infrared channel simultaneously, the fluorescence signal of collection is not only made to be enhanced, and can the change of self-adaptation distance, there is the advantage that environmental suitability is strong, highly sensitive, structure is simple, cost is low.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of spilled oil monitoring method of the present invention.
Fig. 2 be spilled oil monitoring method of the present invention process flow diagram.
Embodiment
As shown in Figure 1-2, the equipment involved by distance self-adaptation spilled oil monitoring method that a kind of fluorescence signal described in the embodiment of the present invention strengthens comprises that light source is launched, fluorescence reception and signal processing circuit three part, is specially light source emitting part and divides and comprise broad spectrum light source, emission bandpass optical filter and launch convergent mirror.
Light source emitting part divides the pulse broadband light beam sending high frequency modulated, beam projection is on the water surface, the oily fluorescence inspired is received by dual channel optoelectronic detector, and signal processing circuit partial order ground controls light source transponder pulse light, detectable signal carried out to solution mediation process in real time.
Described light source emitting part is divided and is comprised broad spectrum light source, emission bandpass optical filter and launch convergent mirror, under the control of signal processing circuit, light source launches the pulsed light beam with certain frequency, project tested region through the filtering of emission bandpass optical filter, transmitting convergent mirror after assembling, light source is preferably pulse xenon lamp.Emission bandpass optical filter comprises two passbands, and one is the ultraviolet wide spectral passband covering 200-400nm spectral range, and one is the IR pass band of passband within the scope of 850nm-1100nm.
Fluorescence reception part comprises two-way receiving cable, every road receiving cable all comprises convergent mirror, bandpass filter and photodetector, wherein, in receiving cable one, bandpass filter adopts fluorescence (i.e. visible ray) receiving belt pass filter, channel spectral range covers 400nm-600nm, be mainly used in receiving fluorescence signal, fluorescence signal is strengthened; In receiving cable two, bandpass filter contains two passbands simultaneously: fluorescence passband (spectral range covers 400nm-600nm) and IR pass band (spectral range covers 850-1100nm), for receiving by the infrared signal comprised in the exciting light that reflects, eliminate distance to the impact of signal intensity.
In every paths, receive convergent mirror receive corresponding fluorescent light beam and infrared beam and assemble, through other stray lights of receiving belt pass filter filtering, finally be sent on photodetector, light signal is converted to electric signal by photodetector, and through current/voltage-converted, enlarge leadingly and signal receiving, realize the collection of desired signal.Photodetector is large face battle array silicon photoelectric diode preferably.
Described signal processing circuit comprises light source pulse modulation control circuit, receiving signal demodulation circuit, analog to digital conversion, data processing module and external interface.Transmitting illuminant is modulated to certain high-frequency signal by light source pulse modulation control circuit, and by the receiving signal demodulation with transmitting illuminant Strength Changes out, by high frequency modulated and the demodulation of signal, filtering environmental light is on the impact of equipment for receiving signal demodulation circuit.
In two paths, convergent mirror is identical with photodetector.Described signal processing circuit comprises light source pulse modulation control circuit, receiving signal demodulation circuit, analog to digital conversion, data processing module and external interface.
Broad spectrum light source preferred pulse xenon lamp, power 50W, can regulate glow frequency as required, realizes radiative modulation.
Launch camera lens and select fused silica glass, to ensure there is good transmitance in the ultraviolet range of 200nm-400nm.
Launching optical filter is broadband belt pass filter, and H103 resin comprises two free transmission ranges, and a free transmission range covers 200nm-400nm ultraviolet spectrum, and another passband is in 850nm-1100nm infra-red range, and other spectral coverages end completely.
Receive convergent mirror and adopt quartz or K9 glass lens, in visible ray-near infrared range, have good transmitance.
What receive optical filter 1 covers 400nm-600nm scope through scope, and through the preferred 400nm-500nm of band, peak transmittance is better than 50%, ends completely at 200nm-400nm and 600nm-1100nm.
What receive optical filter 2 comprises two passbands through scope, and one of them passband is identical with the passband of optical filter 1, and another one passband covers 850nm-1100nm.
Large face battle array silicon photoelectric diode selected by photoelectric sensor, has higher photoelectric transformation efficiency within the scope of 400nm-600nm, and spectral response range covers 400nm-1100nm simultaneously.
Signal processing circuit take arm processor as core, can select LPC2468.Function comprises light source pulse modulation control circuit, receiving signal demodulation circuit, analog to digital conversion, data processing module and external interface.
Light source pulse modulation control circuit controls light source and launches high-frequency impulse light beam, and receiving signal demodulation circuit receives fluorescence signal or infrared signal and carries out demodulation, and by modulating and demodulating signal, the interference of filtering environmental light signal, improves signal to noise ratio (S/N ratio) to greatest extent.Voltage signal after demodulation is converted to digital signal by analog to digital conversion, spilled oil monitoring algorithm in service data processing module, calculate and whether have oil spilling to occur, do further emergency advance warning process eventually through external interface as RS232, wireless communication interface etc. pass to host computer in real time.
Spilled oil monitoring algorithm is: suppose that the signal that passage one and passage two obtain is respectively A and B, wherein A is the fluorescence signal collected, and B is the superposed signal of fluorescence signal and the infrared signal collected, according to formula
calculate the signal for carrying out threshold decision, this signal is the fluorescence signal factor that strengthens of two-way and eliminates the impact of distance factor.
The above, be only the specific embodiment of the present invention, and therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.The above embodiment of the present invention is lifted and is only used to example of the present invention is clearly described simultaneously, and is not limited thereto protection scope of the present invention.Any those skilled in the art of being familiar with can also make other multi-form change, variation or replacement on the basis of the above description, cannot give exhaustive here to all embodiments.Every belong to technical scheme of the present invention apparent change, the variation of extending out or replace and be still in the row of the protection domain of the present invention and claim.
Claims (9)
1. the distance self-adaptation spilled oil monitoring method of a fluorescence signal enhancing, adopt broad spectrum light source, the broad-spectrum beam that broad spectrum light source sends obtains wide spectral ultraviolet light and a part of infrared spectrum after optical filter filters, monitored water-surface areas is projected by transmitting convergent mirror, two paths is adopted to receive signal, wherein the fluorescence signal of first via channel reception stimulated emission obtains signal A, the infrared signal that second paths receives in the fluorescence signal of stimulated emission and water-reflected excitation beam simultaneously obtains signal B, by two paths of signals being added the fluorescence signal (A+B) obtaining and strengthen, two paths of signals is subtracted each other and obtains infrared signal as reference signal (B-A), the fluorescence signal of enhancing and reference signal are asked the change of ratio erasure signal intensity distance, by whether having oil film to exist to the signal ratio setting threshold decision water surface.
2. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 1, is characterized in that,
Two paths signal intensity all contains the decay factor with distance, i.e. square being inversely proportional to of signal intensity and distance.
3. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 1, is characterized in that,
Calculate
whether occur by arranging threshold decision oil spilling to the signal S calculated.
4. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 1, is characterized in that,
Also comprise, to the process of two paths signal A, B, comprise broad spectrum light source, by pulse modulation control circuit, transmitting illuminant is modulated to certain high-frequency signal, the receiving signal demodulation circuit of two passages by the receiving signal demodulation with transmitting illuminant Strength Changes out, by high frequency modulated and the demodulation of signal, the impact of filtering environmental light.
5. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 1, is characterized in that,
Receiving belt pass filter in described first via passage is fluorescence reception bandpass filter, and channel spectral range covers 400nm-600nm.
6. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 5, is characterized in that,
Reception optical filter in described second paths contains two passbands simultaneously, comprises the IR pass band that the fluorescence passband of the fluorescence reception bandpass filter identical with passage one and spectral range cover 850-1100nm.
7. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 6, is characterized in that,
Be respectively equipped with photodetector in two paths, light signal is converted to electric signal by photodetector, and through current/voltage-converted, enlarge leadingly and signal receiving.
8. the distance self-adaptation spilled oil monitoring method of a kind of fluorescence signal enhancing as claimed in claim 7, is characterized in that,
Described photodetector is set to large face battle array silicon photoelectric diode.
9. the distance self-adaptation spilled oil monitoring method that a kind of fluorescence signal as described in claim 1 to 8 strengthens, is characterized in that,
The light beam that the light beam that broad spectrum light source sends is launched after the optical filtering of bandpass filter comprises two passbands, and one is the ultraviolet wide spectral passband covering 200-400nm spectral range, and one is the IR pass band of passband within the scope of 850nm-1100nm.
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Cited By (5)
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| CN106769882A (en) * | 2016-11-01 | 2017-05-31 | 深圳先进技术研究院 | Spilled oil monitoring instrument and its monitoring method |
| CN108806199A (en) * | 2018-06-08 | 2018-11-13 | 昆山智易知信息科技有限公司 | Offshore spilled oil monitoring threshold setting method based on ID3 algorithms and neural network |
| CN110487738A (en) * | 2018-05-14 | 2019-11-22 | 中国石油化工股份有限公司 | A kind of ultraviolet oil film monitoring device of LED and spilled oil monitoring method |
| CN110646390A (en) * | 2019-09-27 | 2020-01-03 | 昆山智易知信息科技有限公司 | Water surface oil stain monitoring system and method based on unmanned aerial vehicle platform |
| CN115276799A (en) * | 2022-07-27 | 2022-11-01 | 西安理工大学 | Decision threshold self-adapting method for undersampling modulation and demodulation in optical imaging communication |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106769882A (en) * | 2016-11-01 | 2017-05-31 | 深圳先进技术研究院 | Spilled oil monitoring instrument and its monitoring method |
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| CN110487738A (en) * | 2018-05-14 | 2019-11-22 | 中国石油化工股份有限公司 | A kind of ultraviolet oil film monitoring device of LED and spilled oil monitoring method |
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| CN108806199B (en) * | 2018-06-08 | 2020-06-23 | 昆山智易知信息科技有限公司 | Sea surface oil spill monitoring threshold setting method based on ID3 algorithm and neural network |
| CN110646390A (en) * | 2019-09-27 | 2020-01-03 | 昆山智易知信息科技有限公司 | Water surface oil stain monitoring system and method based on unmanned aerial vehicle platform |
| CN115276799A (en) * | 2022-07-27 | 2022-11-01 | 西安理工大学 | Decision threshold self-adapting method for undersampling modulation and demodulation in optical imaging communication |
| CN115276799B (en) * | 2022-07-27 | 2023-07-11 | 西安理工大学 | Decision threshold self-adaption method for undersampling modulation demodulation in optical imaging communication |
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