CN104677873A - Optoelectronic signal processing circuit and ambient light filtering method using same - Google Patents
Optoelectronic signal processing circuit and ambient light filtering method using same Download PDFInfo
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- CN104677873A CN104677873A CN201510098324.8A CN201510098324A CN104677873A CN 104677873 A CN104677873 A CN 104677873A CN 201510098324 A CN201510098324 A CN 201510098324A CN 104677873 A CN104677873 A CN 104677873A
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Abstract
The invention discloses an optoelectronic signal processing circuit and an ambient light filtering method. The optoelectronic signal processing circuit comprises a master controller, wherein the master controller controls a light emitting circuit through a trigger circuit to emit light to a detected area; reflected light emitted by the detected area is filtered by a receiving circuit light filtering device and enters a photovoltaic conversion device, an output end of the photovoltaic conversion device is connected with an input end of a first A/D (analog/digital) converter, an output end of the first A/D converter is connected with the master controller, and the output end of the photovoltaic conversion device is simultaneously connected with a positive end of a subtractor; a negative end of the subtractor is connected with an output end of a D/A (digital/analog) converter, an input end of the D/A converter is connected with the master controller, an output end of the subtractor is connected with an input end of a second A/D converter, and an output end of the second A/D converter is connected with the master controller. The disclosed optoelectronic signal processing circuit eliminates influence of ambient light through two means including the light filtering device and the subtractor.
Description
Technical field
The present invention relates to environmental monitoring field, the ambient light rejection method relating to the photoelectric signal processing circuit in a kind of oil spilling pick-up unit in this field specifically and use this circuit to carry out.
Background technology
Ocean is the cradle of life.According to statistics, spilled oil on water surface is one of principal element causing marine environmental pollution, and its impact will be long-term.In order to reduce oil pollution as much as possible, require to occur just can find oil spilling in early days at oil spilling, and the antipollution further diffusion that takes appropriate measures.Non-contact fluorescence detection method wherein adopts the oily substance of ultraviolet light to the water surface of specific wavelength to irradiate, palycyclic aromatic in oily substance can absorb energy and be excited and produce the fluorescence of specific wavelength, and the fluorescent effect according to this oily substance can detect water surface oil.
This fluorescence detection method make use of the characteristic of oils itself, and sensor is not directly arranged in the seawater, is not subject to the impact of biofouling in seawater and fragment, highly sensitive, is the effective ways that current water surface oils detects.But the wavelength of fluorescence is positioned at the normal wavelength range of sunshine, because ambient light intensity is in the same time not identical, particularly the difference in daytime and evening is very large, thus causes result misjudgment.And in order to take into account excitation intensity and serviceable life, fluoroscopic examination many employings pulsating wave carries out excitation-detection, the time of pulsating wave is short, generally being no more than 10 μ s, how within the so short time, capturing this fluorescence accurately, is also the problem that checkout equipment must be considered.
Summary of the invention
Technical matters to be solved by this invention, is just to provide a kind of photoelectric signal processing circuit used in oil spilling pick-up unit and the ambient light rejection method using this circuit to carry out.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of photoelectric signal processing circuit, its improvements are, described circuit comprises: master controller, and described master controller controls illuminating circuit to being detected region luminescence by trigger circuit; Be detected reflected light that region sends through receiving circuit filtering device filter laggard enter photoelectric conversion device, the output terminal of photoelectric conversion device is connected with the input end of the first A/D converter, the output terminal of the first described A/D converter is connected with master controller, and the output terminal of photoelectric conversion device is connected with the anode of subtracter simultaneously; The negative terminal of subtracter is connected with the output terminal of D/A converter, the input end of described D/A converter is connected with master controller, the output terminal of subtracter is connected with the input end of the second A/D converter, and the output terminal of the second described A/D converter is connected with master controller.
Further, described master controller is the device with programmability, can be field programmable gate array FPGA, or complex programmable logic device (CPLD), or microcontroller, or microprocessor MPU, or digital signal processor DSP.
Further, the Ultra-Violet Laser light source of the light source of described illuminating circuit can be wavelength be 250 ± 20nm; Or wavelength is the Ultra-Violet Laser light source of 290 ± 20nm; Or ordinary light source is equipped with the optical filtering of above-mentioned two scopes or optical filter and obtains the light source of fixed wave length scope.
Further, described receiving circuit filtering device is physics optical filtering or optical filter, this optical filtering or optical filter by wavelength of light be greater than the wavelength of light that illuminating circuit sends, and both spectral range non-overlappings.
Further, the first described A/D converter, D/A converter, the second A/D converter can be separate units, also can be built within master controller.
A kind of ambient light rejection method, uses above-mentioned photoelectric signal processing circuit, comprises the steps:
(1) master controller is at not start triggering circuit, in the non-luminous situation of illuminating circuit, start the first A/D converter, after obtaining the output valve of photoelectric conversion device, export this output valve the negative terminal of subtracter to by D/A converter and keep, described output valve be through filtering device filter laggard enter the ambient light signal being detected regional reflex of photoelectric conversion device;
(2) master controller start triggering circuit, illuminating circuit sends exciting light to being detected region, close the first A/D converter, be detected the optical excitation signal of regional reflex and the superposed signal of ambient light signal through filtering device filter laggard enter photoelectric conversion device, photoelectric conversion device exports this superposed signal the anode of subtracter to;
(3) subtracter exports the difference of positive end signal and negative terminal signal to master controller by the second A/D converter, and this difference is the measured value after removing ambient light effects.
Further, above-mentioned steps (1) is less than 20 μ s with the time interval of step (2).
The invention has the beneficial effects as follows:
Photoelectric signal processing circuit disclosed in this invention is a part for whole oil spilling detection system, is that fluorescence signal triggers, the basis of sampling, have employed the impact of filtering device and subtracter two kinds of means removal surround lightings.Adopt filtering device, the light that major part is irrelevant can be filtered, only retain the light of wave band interested, for further subtracter calculation process creates condition; Subtracter exports the difference of superposed signal and ambient light signal, can remove the impact of surround lighting more thoroughly, guarantee the precision of measured value.The use of subtracter, alleviates the computation burden of master controller, makes master controller can concentrate one's energy to carry out written in water light-pulse generator and catches, thus make testing result more reliable.
Ambient light rejection method disclosed in this invention, uses above-mentioned photoelectric signal processing circuit, by the time at a distance of nearer double sampling and subtraction, can effective filtering environmental light, thus make round-the-clock continual oil spilling detection become possibility.
Accompanying drawing explanation
Fig. 1 is the annexation schematic diagram of photoelectric signal processing circuit disclosed in this invention;
Fig. 2 is the process flow diagram of ambient light rejection method disclosed in this invention;
Fig. 3 is the annexation schematic diagram of the photoelectric signal processing circuit disclosed in the embodiment of the present invention 1.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, the invention discloses a kind of photoelectric signal processing circuit, described circuit comprises: master controller 1, and described master controller controls illuminating circuit 3 to being detected region luminescence by trigger circuit 2; Be detected reflected light that region sends through receiving circuit filtering device 4 filter laggard enter photoelectric conversion device 5, the output terminal of photoelectric conversion device is connected with the input end of the first A/D converter 6, the output terminal of the first described A/D converter 6 is connected with master controller 1, and the output terminal of photoelectric conversion device is connected with the anode of subtracter 8 simultaneously; The negative terminal of subtracter 8 is connected with the output terminal of D/A converter 7, the input end of described D/A converter 7 is connected with master controller 1, the output terminal of subtracter 8 is connected with the input end of the second A/D converter 9, and the output terminal of the second described A/D converter 9 is connected with master controller 1.
Described master controller is the device with programmability, can be field programmable gate array FPGA, or complex programmable logic device (CPLD), or microcontroller, or microprocessor MPU, or digital signal processor DSP.
Described trigger circuit have certain driving force and signal ability to transform.Because the output great majority of master controller are logical drive signal, such as Transistor-Transistor Logic level, or CMOS level, trigger circuit will have the driving and burst capability that are transformed to and can drive illuminating circuit luminescence, such as can carry out signal amplification by triode, metal-oxide-semiconductor, or special level drives change-over circuit etc.;
Described illuminating circuit comprises high-voltage driving circuit, light source.Under the triggering of trigger circuit, make light source luminescent by high-voltage driving circuit electric discharge.The Ultra-Violet Laser light source of light source can be wavelength be 250 ± 20nm; Or wavelength is the Ultra-Violet Laser light source of 290 ± 20nm; Or ordinary light source is equipped with the optical filtering of above-mentioned two scopes or optical filter and obtains the light source of fixed wave length scope.
Described filtering device is physics optical filtering or optical filter, this optical filtering or optical filter by wavelength of light be greater than the wavelength of light that illuminating circuit sends, and both spectral range non-overlappings.
The first described A/D converter, D/A converter, the second A/D converter can be separate units, also can be built within master controller, wherein the conversion accuracy of the first A/D converter, the second A/D converter all requires to be not less than 12, is no more than 2 μ s switching time;
Described photoelectric conversion device is can induction light signal, and light signal can be changed into device and the treatment circuit of intensity electric analoging signal corresponding with it.Such as, this device can be the photoresistance of certain wave band, and the resistance variations that change in optical signal causes can be transformed to change in voltage by treatment circuit; Or this device is photodiode, phototriode and corresponding treatment circuit; Or for directly light signal being converted to the photomultiplier etc. of voltage signal.
As shown in Figure 2, the invention also discloses a kind of ambient light rejection method, use above-mentioned photoelectric signal processing circuit, comprise the steps:
(1) master controller is at not start triggering circuit, in the non-luminous situation of illuminating circuit, start the first A/D converter, after obtaining the output valve of photoelectric conversion device, export this output valve the negative terminal of subtracter to by D/A converter and keep, described output valve be through filtering device filter laggard enter the ambient light signal being detected regional reflex of photoelectric conversion device;
(2) master controller start triggering circuit, illuminating circuit sends exciting light to being detected region, close the first A/D converter, be detected the optical excitation signal of regional reflex and the superposed signal of ambient light signal through filtering device filter laggard enter photoelectric conversion device, photoelectric conversion device exports this superposed signal the anode of subtracter to;
(3) subtracter exports the difference of positive end signal and negative terminal signal to master controller by the second A/D converter, and this difference is the measured value after removing ambient light effects.
Above-mentioned steps (1) is less than 20 μ s with the time interval of step (2).
Embodiment 1, as shown in Figure 1, present embodiment discloses a kind of photoelectric signal processing circuit, described circuit comprises: master controller 1, and described master controller controls illuminating circuit 3 to being detected region luminescence by trigger circuit 2; Be detected reflected light that region sends through filtering device 4 filter laggard enter photoelectric conversion device 5, one end of photoelectric conversion device is connected with the first A/D converter 6, the first described A/D converter 6 is built in master controller 1, and the other end is connected with the anode of subtracter 8; The negative terminal of subtracter 8 is connected with D/A converter 7, and described D/A converter 7 is built in master controller 1, and the output terminal of subtracter 8 is connected with the second A/D converter 9, and the second described A/D converter 9 is built in master controller 1.
Wherein, master controller adopts STM32F107 microcontroller, and this controller is based on Cortex-M3 kernel, and its inside carries multi-channel A/D passage and 2 road D/A passages, is 12bits conversion accuracy.Therefore the peripheral hardware that the A/D converter in this embodiment and D/A converter all adopt STM32F107 inside to carry is to complete D/A switch and analog/digital conversion.
Because STM32 series adopts 3.3V Power supply, in order to realize the pulsed drive of 5V, the present embodiment adopts metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 combination to realize the driving pulse of 5V.When the GPIO of STM32F107 exports as low level, due to the drop-down effect of R2 and the pull-up effect of R4, Q1 and Q2 all not conductings ,+5V driving pulse can not be added to the control end of pulse xenon lamp; When the GPIO of STM32F107 exports as high level, due to the dividing potential drop of R1 and R2, and the dividing potential drop of R3 and R4, make Q1 and Q2 conducting ,+5V driving pulse is added to the control end of pulse xenon lamp, causes pulse xenon lamp luminous.
The present embodiment have employed the light source of pulse xenon lamp as illuminating circuit, and because the spectral range of pulse xenon lamp is wider, its light sent is 254nm through centre frequency, and half band-width is after the output optical filter of 20nm, exports the ultraviolet light of fixed wave length scope.
It is 360nm that the present embodiment have employed centre frequency, and half band-width is that the input optical filter of 20nm carrys out the light of Selective absorber within the scope of this as filtering device;
The present embodiment have employed photomultiplier as photoelectric conversion device to realize the conversion of light signal to electric signal, and photomultiplier can be changed and amplifying optical signals.The present embodiment adopts operational amplifier OP07 and peripheral circuits to form subtracter.
Claims (7)
1. a photoelectric signal processing circuit, is characterized in that, described circuit comprises: master controller, and described master controller controls illuminating circuit to being detected region luminescence by trigger circuit; Be detected reflected light that region sends through receiving circuit filtering device filter laggard enter photoelectric conversion device, the output terminal of photoelectric conversion device is connected with the input end of the first A/D converter, the output terminal of the first described A/D converter is connected with master controller, and the output terminal of photoelectric conversion device is connected with the anode of subtracter simultaneously; The negative terminal of subtracter is connected with the output terminal of D/A converter, the input end of described D/A converter is connected with master controller, the output terminal of subtracter is connected with the input end of the second A/D converter, and the output terminal of the second described A/D converter is connected with master controller.
2. photoelectric signal processing circuit according to claim 1, it is characterized in that: described master controller is the device with programmability, can be field programmable gate array FPGA, or complex programmable logic device (CPLD), or microcontroller, or microprocessor MPU, or digital signal processor DSP.
3. photoelectric signal processing circuit according to claim 1, is characterized in that: the Ultra-Violet Laser light source of the light source of described illuminating circuit can be wavelength be 250 ± 20nm; Or wavelength is the Ultra-Violet Laser light source of 290 ± 20nm; Or ordinary light source is equipped with the optical filtering of above-mentioned two scopes or optical filter and obtains the light source of fixed wave length scope.
4. photoelectric signal processing circuit according to claim 1, it is characterized in that: described receiving circuit filtering device is physics optical filtering or optical filter, this optical filtering or optical filter by wavelength of light be greater than the wavelength of light that illuminating circuit sends, and both spectral range non-overlappings.
5. photoelectric signal processing circuit according to claim 1, is characterized in that: the first described A/D converter, D/A converter, the second A/D converter can be separate units, also can be built within master controller.
6. an ambient light rejection method, uses the photoelectric signal processing circuit described in claim 1, it is characterized in that, comprise the steps:
(1) master controller is at not start triggering circuit, in the non-luminous situation of illuminating circuit, start the first A/D converter, after obtaining the output valve of photoelectric conversion device, export this output valve the negative terminal of subtracter to by D/A converter and keep, described output valve be through filtering device filter laggard enter the ambient light signal being detected regional reflex of photoelectric conversion device;
(2) master controller start triggering circuit, illuminating circuit sends exciting light to being detected region, close the first A/D converter, be detected the optical excitation signal of regional reflex and the superposed signal of ambient light signal through filtering device filter laggard enter photoelectric conversion device, photoelectric conversion device exports this superposed signal the anode of subtracter to;
(3) subtracter exports the difference of positive end signal and negative terminal signal to master controller by the second A/D converter, and this difference is the measured value after removing ambient light effects.
7. ambient light rejection method according to claim 6, is characterized in that: step (1) is less than 20 μ s with the time interval of step (2).
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| CN201510098324.8A CN104677873A (en) | 2015-03-06 | 2015-03-06 | Optoelectronic signal processing circuit and ambient light filtering method using same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105758430A (en) * | 2016-03-07 | 2016-07-13 | 成都维客亲源健康科技有限公司 | Ambient light resisting circuit and method |
| CN106093955A (en) * | 2016-07-12 | 2016-11-09 | 李颖 | A kind of stay under water oil apparatus and method based on microwave modulation laser acquisition |
| CN107677606A (en) * | 2017-11-20 | 2018-02-09 | 广东上风环保科技有限公司 | A kind of detection circuit based on photometry |
| CN109883912A (en) * | 2019-02-28 | 2019-06-14 | 河海大学 | A kind of water body sediment concentration measuring device and method |
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| CN102937586A (en) * | 2012-11-01 | 2013-02-20 | 南京信息工程大学 | Laser radar based water-in-cloud raman scattering full-spectrum measurement system and method thereof |
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| US20050263710A1 (en) * | 2004-06-01 | 2005-12-01 | Shang-Chih Tsou | Detector and method therof for detecting intensity of ultraviolet rays within different wave bands |
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| CN106093955A (en) * | 2016-07-12 | 2016-11-09 | 李颖 | A kind of stay under water oil apparatus and method based on microwave modulation laser acquisition |
| CN107677606A (en) * | 2017-11-20 | 2018-02-09 | 广东上风环保科技有限公司 | A kind of detection circuit based on photometry |
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| CN109883912A (en) * | 2019-02-28 | 2019-06-14 | 河海大学 | A kind of water body sediment concentration measuring device and method |
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Application publication date: 20150603 |