CN204405546U - A kind of photoelectric signal processing circuit - Google Patents
A kind of photoelectric signal processing circuit Download PDFInfo
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- CN204405546U CN204405546U CN201520127905.5U CN201520127905U CN204405546U CN 204405546 U CN204405546 U CN 204405546U CN 201520127905 U CN201520127905 U CN 201520127905U CN 204405546 U CN204405546 U CN 204405546U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
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- 239000003921 oil Substances 0.000 description 11
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910052724 xenon Inorganic materials 0.000 description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 5
- 230000011514 reflex Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
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- 239000004065 semiconductor Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001917 fluorescence detection Methods 0.000 description 2
- 230000001795 light effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
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- 125000003118 aryl group Chemical group 0.000 description 1
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model discloses a kind of photoelectric signal processing circuit, comprise master controller, 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.Photoelectric signal processing circuit disclosed in the utility model, have employed the impact of filtering device and subtracter two kinds of means removal surround lightings.
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.
Utility model content
Technical problem to be solved in the utility model, 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 beneficial effects of the utility model are:
Photoelectric signal processing circuit disclosed in the utility model 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 the utility model, 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 the utility model;
Fig. 2 is the process flow diagram of ambient light rejection method disclosed in the utility model;
Fig. 3 is the annexation schematic diagram of the photoelectric signal processing circuit disclosed in the utility model embodiment 1.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the utility model 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 (5)
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520127905.5U CN204405546U (en) | 2015-03-06 | 2015-03-06 | A kind of photoelectric signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520127905.5U CN204405546U (en) | 2015-03-06 | 2015-03-06 | A kind of photoelectric signal processing circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677873A (en) * | 2015-03-06 | 2015-06-03 | 綦声波 | Optoelectronic signal processing circuit and ambient light filtering method using same |
| CN115291234A (en) * | 2022-09-01 | 2022-11-04 | 深圳市汇顶科技股份有限公司 | Time difference of flight ranging module, anomaly detection method thereof and electronic equipment |
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2015
- 2015-03-06 CN CN201520127905.5U patent/CN204405546U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677873A (en) * | 2015-03-06 | 2015-06-03 | 綦声波 | Optoelectronic signal processing circuit and ambient light filtering method using same |
| CN115291234A (en) * | 2022-09-01 | 2022-11-04 | 深圳市汇顶科技股份有限公司 | Time difference of flight ranging module, anomaly detection method thereof and electronic equipment |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170421 Address after: 266000 Qingdao blue Silicon Valley core area business center, Shandong Patentee after: QINGDAO SENKETE INTELLIGENT INSTRUMENT CO., LTD. Address before: 266073 Shandong Province, Qingdao city Nanping Road No. 7 Patentee before: Qi Shengbo |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20180306 |
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| CF01 | Termination of patent right due to non-payment of annual fee |