CN104596991A - Detection device for water body turbidity - Google Patents
Detection device for water body turbidity Download PDFInfo
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- CN104596991A CN104596991A CN201410830045.1A CN201410830045A CN104596991A CN 104596991 A CN104596991 A CN 104596991A CN 201410830045 A CN201410830045 A CN 201410830045A CN 104596991 A CN104596991 A CN 104596991A
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Abstract
The invention relates to the technical field of water body detection, and specifically relates to a detection device for water body turbidity. The detection device comprises a controller, a connection flat cable, a laser driver, a tunable laser, a photoelectric detector array and a light wave escape device, wherein the controller is connected with the laser driver and the photoelectric detector array through the connection flat cable; the laser driver is connected with the tunable laser; the light wave escape device is connected with the tunable laser. A water body is irradiated by the tunable laser, transmitting light escapes through the light wave escape device, and light intensities in various direction are detected by virtue of the photoelectric detector array, thus obtaining an accurate turbidity value; the water body turbidity can be much accurately measured, and real-time measurement can be realized without the need of sampling pre-treatment and the need of other chemicals for carrying out chemical reactions, so that secondary pollution is avoided; the detection device is simple and convenient, high in sensitivity, and capable of realizing online or portable measurement.
Description
Technical field
The present invention relates to water body detection technique field, be specifically related to a kind of turbidity pick-up unit.
Background technology
Turbidity is measured, mainly contains the methods such as spectrophotometric method, visual turbidimetry and scattering method.Spectrophotometric method is at moderate temperatures, and sulfuric acid callosity is polymerized with hexamethylenetetramine, forms white high molecular polymer, in this, as turbidity standard, under certain condition compared with water sample turbidity, is applicable to potable water, natural water and ultra.Visual turbidimetry is by water sample and compares with the turbidity standard that zeyssatite is prepared, and is applicable to the water of the low turbidity such as potable water and source water.Scattering method is the illumination water jetting body using specific band, light is made to pass one section of sample, then from being 90 ° with utilizing emitted light, angle gathers by the scattered light of particle scattering in water, thus calculate turbidity, the method is applied widely, and the nephelometer according to the method manufacture can realize field continuous coverage.
But the existing device utilizing scattering method to carry out turbidity detection is owing to being the scattered light on collection single direction, and light is when water transmission, not only some scattering, but also some is absorbed, in the scattering of the light of certain wavelength and receptivity and water, the scattering of all particles and absorption coefficient have relation, therefore only consider that the testing result application condition that scattered light in a single direction obtains is large.
In addition, for the situation that turbidity variation range is larger, single-range light source is adopted to detect, if there is the particle to launching light intensity absorption in water, easily cause measurement inaccurate, therefore, a pick-up unit just can not meet measurement requirement, and the pick-up unit changing multiple different range may be needed to measure.Significantly increase cost and the complexity of turbidity detection.
Summary of the invention
For the defect that testing result error in prior art is comparatively large and testing process is complicated and testing cost is higher, the invention provides a kind of turbidity pick-up unit.
A kind of turbidity pick-up unit provided by the invention, comprising: controller, connection winding displacement, laser driver, tunable laser, photodetector array and light wave effusion device;
Described controller is connected by the described winding displacement that is connected with described laser driver and described photodetector array respectively; Described laser driver is connected with described tunable laser; Described light wave effusion device is connected with described tunable laser.
Further, described controller comprises: controlled processing unit, signal gathering unit, display unit and communication unit;
Described controlled processing unit carries out process for the data controlling described laser driver and receive described signal gathering unit and obtains turbidity; And by described display unit display translation;
Described signal gathering unit is used for collecting digital electric signal the light signal received from described photoelectric detector permutation, and is transferred to described controlled processing unit;
Described communication unit is used for described device and remote equipment carries out information interaction.
Further, described laser driver comprises for the Laser Modulation unit regulating the laser tuning unit of described tunable laser excitation wavelength and modulate described tunable laser excitation light wave.
Further, described connection winding displacement is the anti-interference FFC winding displacement of copper-clad paper tinsel.
Further, described light wave effusion device is the naked core optical fiber of rejecting surrounding layer.
Further, described naked core optical fiber, through corrosion treatment, obtains the naked core optical fiber that surface roughness features destroys the total reflection of light.
Further, described naked core optical fiber adopts helical structure.
Further, all photoelectric detectors in described photodetector array are distributed in around described light wave effusion device, for receiving the light wave of the different directions of described light wave effusion device effusion.
Further, described device also comprises spherical shell, and described photodetector array is arranged at inside described spherical shell, described light wave effusion device is arranged at the center in described spherical shell;
Described spherical shell is provided with multiple through hole.
Further, all photoelectric detectors in described photodetector array adopt high glass capsulation thoroughly.
A kind of turbidity pick-up unit provided by the invention, by tunable laser, water body is irradiated, utilizing emitted light is come by the effusion of light wave effusion device, utilizes a large amount of photoelectric detector to detect the light intensity of all directions simultaneously, obtains turbidity value comparatively accurately according to built-in algorithms inverting.Water turbidity can be measured more accurately, and real-time measurement can be realized, not need pre-service of sampling, do not need other medicines to carry out chemical reaction, there is no secondary pollution, simple and convenient, there is higher sensitivity, online or portable type measuring can be realized.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 is turbidity structure of the detecting device schematic diagram in one embodiment of the invention.
Embodiment
Now in conjunction with the accompanying drawings and embodiments technical solution of the present invention is further elaborated.
Fig. 1 shows turbidity structure of the detecting device schematic diagram in the present embodiment, and as shown in Figure 1, a kind of turbidity pick-up unit that the present embodiment provides, comprising:
Controller 1, connection winding displacement 2, laser driver 3, tunable laser 4, photodetector array 5 and light wave effusion device 6;
Described controller 1 connects 2 with described laser driver 3 and described photodetector array 5 by the described winding displacement that is connected respectively; Described laser driver 3 is connected with described tunable laser 4; Described light wave effusion device 6 is connected with described tunable laser 4.
Described controller 1 drives described tunable laser 4 excitation light wave and carries out process to the light signal that described photodetector array 5 receives obtain turbidity for controlling described laser driver 3; Described laser driver 3 is for driving described tunable laser 4 excitation light wave; The light beam that described tunable laser 4 produces enters water body to be detected through described light wave effusion device 6; The light wave that described photodetector array 5 is overflowed for receiving described light wave effusion device 6.
Wherein, described controller 1 comprises: controlled processing unit, signal gathering unit, display unit and communication unit;
Described controlled processing unit carries out process for the data controlling described laser driver and receive described signal gathering unit and obtains turbidity, and described controlled processing unit obtains the turbidity value of water body according to built-in algorithms inverting; And by described display unit display translation;
Described signal gathering unit comprises demodulator circuit and 12 A/D convertor circuits, for collecting digital electric signal in the light signal from described photoelectric detector permutation reception, and being transferred to described controlled processing unit, can realizing the signal extraction of very high s/n ratio;
Described communication unit is used for and remote equipment by serial communication, and such as the other system such as computer or collector carries out information interaction, and communication protocol is the Modbus agreement of standard.
Light is when water transmission, not only some scattering, but also some is absorbed, in the scattering of the light of certain wavelength and receptivity and water, the scattering of all particles and absorption coefficient have relation, the turbidity that the absorption of particle and scattering are considered simultaneously and obtained is just closer to actual value, on the travel path of light, (90 °) vertical with light path are boundary, be divided into forward scattering (0 ° to 90 °) and back scattering (90 ° to 180 °), forward scattering is generally used for the measurement of high concentrtion sample, 90 ° are measured as turbidimetric analysis turbidimetry method for making, be generally used for low turbidity pattern detection, back scattering can be used in Turbidity measurement too.
Therefore, in order to more accurate turbidity testing result can be obtained, all photoelectric detectors in described photodetector array 5 are distributed in described light wave effusion device 6 around, for receiving the light wave of the different directions that described light wave effusion device 6 is overflowed.
For example, as shown in Figure 1, described device also comprises spherical shell 7, is arranged at by described photodetector array 5 inside described spherical shell 7, described light wave effusion device 6 is arranged at the center in described spherical shell 7.Adopt ball array, effectively can obtain the light scattering signal of multiple different angles, and present and be uniformly distributed, directly can carry out process calculating to the output of each photoelectric detector, obtain the scattered light intensity on any direction.
Further, described spherical shell 7 is provided with multiple through hole, for realizing water body flow inside and outside described spherical shell 7, the situation of change of real-time detection surrounding water turbidity.
Further, all photoelectric detectors in described photodetector array 5 adopt high glass capsulation thoroughly.
Simultaneously for the situation that turbidity variation range is larger, if there is the particle to launching light intensity absorption in water, adopting single-range light source to detect, easily causing measurement inaccurate.For addressing the aforementioned drawbacks, the laser instrument 4 of the device that the present embodiment provides adopts tunable laser diode.
Accordingly, laser driver described in described laser driver 3 comprises for the Laser Modulation unit regulating the laser tuning unit of described tunable laser excitation wavelength and modulate described tunable laser excitation light wave.
Described laser tuning unit can by regulating laser temperature or regulating laser drive current to realize regulating described tunable laser 4 to excite the light wave of different wave length; Described Laser Modulation unit is used for carrying out modulation treatment to laser, and modulation system can be sine wave drive, square wave drives, triangular wave drives or wherein arbitrarily the superposition of two or more signals or modulation use.
Such as described laser driver 3 regulates laser instrument 4 temperature by temperature control equipment thus realizes the excitation wavelength of adjustment laser instrument 4.Make its to arrange degree centigrade 20 to 50 within the scope of switch, directly obtain the laser of a series of different wave length, the spectral signal in this wavelength coverage can be obtained, can the Changing Pattern of analysis to measure scattered light signal more comprehensively.
In the present embodiment, the wave band that described laser diode adopts is 1550nm, can realize excitation light wave change within the scope of 4-5nm by temperature adjustment.
Further, described light wave effusion device 6 is the naked core optical fiber of rejecting surrounding layer, and by described naked core optical fiber through corrosion treatment, obtains the naked core optical fiber that surface roughness features destroys the total reflection of light.
Described naked core optical fiber adopts helical structure to increase fiber lengths, thus increases the light intensity of effusion, and the light of effusion is detected by the photodetector array 5 of all directions respectively through water body.
A kind of turbidity pick-up unit that the present embodiment provides, by a tunable laser diode, water body is irradiated, utilizing emitted light is come by the effusion of light wave effusion device, utilize a large amount of photoelectric detector to detect the light intensity of all directions simultaneously, by regulating laser emission wavelength, obtain the water body scattering data under different wave length, modulated by laser signal, coordinate demodulator circuit, trickle light intensity change can be obtained, according to built-in model algorithm Inversion Calculation, thus obtain turbidity value comparatively accurately.Water turbidity can be measured more accurately, and real-time measurement can be realized, not need pre-service of sampling, do not need other medicines to carry out chemical reaction, there is no secondary pollution, simple and convenient, there is higher sensitivity, online or portable type measuring can be realized.The pick-up unit simultaneously adopting the present embodiment to provide can also carry out long-term unmanned and automatically measure, and can realize Long-distance Control and digital independent.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (10)
1. a turbidity pick-up unit, is characterized in that, described device comprises: controller, connection winding displacement, laser driver, tunable laser, photodetector array and light wave effusion device;
Described controller is connected by the described winding displacement that is connected with described laser driver and described photodetector array respectively; Described laser driver is connected with described tunable laser; Described light wave effusion device is connected with described tunable laser.
2. device according to claim 1, is characterized in that, described controller comprises: controlled processing unit, signal gathering unit, display unit and communication unit;
Described controlled processing unit carries out process for the data controlling described laser driver and receive described signal gathering unit and obtains turbidity; And by described display unit display translation;
Described signal gathering unit is used for collecting digital electric signal the light signal received from described photoelectric detector permutation, and is transferred to described controlled processing unit;
Described communication unit is used for described device and remote equipment carries out information interaction.
3. device according to claim 1, is characterized in that, described laser driver comprises for the Laser Modulation unit regulating the laser tuning unit of described tunable laser excitation wavelength and modulate described tunable laser excitation light wave.
4. device according to claim 1, is characterized in that, described connection winding displacement is the anti-interference FFC winding displacement of copper-clad paper tinsel.
5. device according to claim 1, is characterized in that, described light wave effusion device is the naked core optical fiber of rejecting surrounding layer.
6. device according to claim 5, is characterized in that, described naked core optical fiber, through corrosion treatment, obtains the naked core optical fiber that surface roughness features destroys the total reflection of light.
7. device according to claim 6, is characterized in that, described naked core optical fiber adopts helical structure.
8. device according to claim 1, is characterized in that, all photoelectric detectors in described photodetector array are distributed in around described light wave effusion device, for receiving the light wave of the different directions of described light wave effusion device effusion.
9. device according to claim 8, is characterized in that, described device also comprises spherical shell, and described photodetector array is arranged at inside described spherical shell, described light wave effusion device is arranged at the center in described spherical shell;
Described spherical shell is provided with multiple through hole.
10. the device according to claim 1,8 or 9, is characterized in that, all photoelectric detectors in described photodetector array adopt high glass capsulation thoroughly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112782143A (en) * | 2020-12-29 | 2021-05-11 | 深圳市利拓光电有限公司 | Water quality monitoring system and water quality monitoring laser |
| CN118130330A (en) * | 2024-03-07 | 2024-06-04 | 四川省地质矿产勘查开发局区域地质调查队 | Inter-stratum ground water turbidity and mud film observation device and method and application thereof |
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Cited By (2)
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| CN112782143A (en) * | 2020-12-29 | 2021-05-11 | 深圳市利拓光电有限公司 | Water quality monitoring system and water quality monitoring laser |
| CN118130330A (en) * | 2024-03-07 | 2024-06-04 | 四川省地质矿产勘查开发局区域地质调查队 | Inter-stratum ground water turbidity and mud film observation device and method and application thereof |
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