CN102914519A - Optical fiber type laser liquid turbidity measuring device and measuring method - Google Patents

Optical fiber type laser liquid turbidity measuring device and measuring method Download PDF

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Publication number
CN102914519A
CN102914519A CN2012104017534A CN201210401753A CN102914519A CN 102914519 A CN102914519 A CN 102914519A CN 2012104017534 A CN2012104017534 A CN 2012104017534A CN 201210401753 A CN201210401753 A CN 201210401753A CN 102914519 A CN102914519 A CN 102914519A
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optical fiber
turbidity
signal
laser
value
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CN102914519B (en
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桂华侨
韩霞
程寅
王杰
赵南京
陆亦怀
刘建国
张玉钧
张建
王田丽
殷高方
李德平
曹会彬
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Shengli Oilfield Shengli Eexploration & Design Research Institute Co ltd
Hefei Institutes of Physical Science of CAS
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Shengli Oilfield Shengli Eexploration & Design Research Institute Co ltd
Hefei Institutes of Physical Science of CAS
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Abstract

The invention relates to an optical fiber type laser liquid turbidity measuring device and measuring method. The measuring device comprises a laser, an optical fiber, an optical fiber circulator, an optical fiber collimator, a photoelectric detector and a signal demodulating and processing system. In a measuring system, a full-optical fiber structure of the optical fiber circulator and the optical fiber collimator is adopted, and on the basis of a back scattering light measuring principle, namely, a monotonous relation between the liquid turbidity and the increasing of the scattering light intensity, the accurate on-line measurement for the liquid turbidity under the conditions of long distance and narrow space and other complex conditions is realized. The optical fiber type laser liquid turbidity measuring device has a simple structure, is easy to realize and is high in stability and sensitivity; the practicability and safety of a liquid turbidity measuring system are effectively increased; and a technical support is supplied to the long-term on-line water quality monitoring.

Description

A kind of optical fiber type laser liquid turbidity meter and measuring method
Technical field
The present invention relates to a kind of optical fiber type laser turbidity meter and measuring method, belong to the environmental monitoring technology field.
Background technology
Liquid turbidity is a kind of optical property of liquid, refer to since in the liquid solid suspended particles and impurity scattering of light is caused the decline of water sample transparency.When water pollution issue was day by day serious, water turbidity was one of basic index of reflection water quality condition.In oil extraction process, generally also need to improve petroleum production by means such as water fillings, if but be turbidity when too high with a large amount of suspensions in the water filling, will block water injection well diafiltration end face and seepage flow duct and hinder the extraction of oil.Therefore, at aspects such as conventional water quality monitoring, aquaculture, drinking water safety, reservoir waters, the accurate monitoring of liquid turbidity is all quite important.
American-European countries just carries out design and the production of turbidimeter since nineteen thirties, technology is comparatively ripe.Also the released one after another turbidimeter of dependable performance, advanced technology of external many instrument and meter company, the lower limit of turbidimetry is constantly extended.Series 4670 turbidimeters that the WTM500 that Sigrist company produces, ABB AB produce all adopt the vertical scatterometry scheme of 90 degree, are mainly used in the turbidimetry of low turbidity water sample.
The research of domestic turbidity detection technique is started late, and technical feature has been compared very large gap with external turbidimeter, and through nearly 10 years research of technique and Importing Foreign Advanced Technology experience, domestic turbidimeter parameters index improves a lot.Shanghai thunder magnetic instrument plant, state-run 267 factories, Beijing Tengine Innovation Instrument Co., Ltd. nephelometer product that also released one after another.
At present, various turbidimetry both domestic and external system but is difficult to realize the online turbidimetry under small space and the special mal-condition of test environment, surpassing 65 degrees centigrade such as environment temperature then can't work, its reason is that probe segment comprises light source, detector and signal processing circuit, and job stability and measurement volumes all can be limited greatly.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, a kind of optical fiber type laser liquid turbidity meter and measuring method are provided, realize the accurate on-line monitoring of liquid turbidity under remote small space and the ultra-hostile environment (UHE).
Technical solution of the present invention: a kind of optical fiber type laser liquid turbidity meter, adopt all optical fibre structure of fiber optical circulator and collimating apparatus, comprise that single-chip microcomputer 1, laser modulation module 2, laser instrument 3, the first optical fiber 4, three fiber port circulators 5, optical fiber collimator 6, the second optical fiber 7, photodetector 8, signal amplify and demodulation module 9; 2 pairs of laser instruments of described laser modulation module 3 carry out intensity modulation, to avoid extraneous parasitic light and environmental change to the interference of signal, laser after the modulation is transferred to the first port of three fiber port circulators 5 through the first optical fiber 4, then the second port from three fiber port circulators 5 outputs to optical fiber collimator 6, light from optical fiber collimator 6 outgoing incides on the testing liquid sample, feed back to optical fiber collimator 6 through the part rear orientation light after the scattering of testing liquid sample endoparticle thing, be that optical fiber collimator 6 is simultaneously as laser input and flashlight receiving device, in the coupling efficiency that improves scattered light, also avoided discrete detecting structure to the hypersensitivity of environmental change, and embody the advantage that volume is little and need not to power, scattered light is through the three port output of optical fiber collimator 6 from three fiber port circulators 5, effective separation input light and flashlight also avoids the rear orientation light nonlinear effect to cause the variation of signal spectrum, the scattered light of exporting from the 3rd port of three fiber port circulators 5 is coupled to the second optical fiber 7, then by photodetector 8 light signal is converted into electric signal, electric signal is delivered to single-chip microcomputer 1 after being processed by signal amplification and demodulation module 9, obtain signal voltage amplitude after the demodulation by single-chip microcomputer 1, the signal amplitude of single-chip microcomputer 1 gained and standard turbidity and voltage magnitude variation relation are compared, drawn liquid turbidity information.
Wherein, the standard turbidity is obtained by following process with the voltage magnitude variation relation: the standard formal chaste tree titer of optical fiber collimator 6 being put into respectively different turbidity more than 6 groups, by obtaining corresponding signal voltage amplitude after signal amplification and demodulation module 9 processing, respectively with the magnitude of voltage that measures and standard turbidity value as coordinate in length and breadth, draw signal voltage amplitude and turbidity variation relation curve, the data that measure carried out linear fit:
Y=A+B*X
Wherein, Y representation signal voltage magnitude, X represents turbidity value, and A and B are respectively the linear fit parameter.Adopt least square method to carry out obtaining the value of parameter A and B behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation.When the error of matched curve and measured value surpasses 2%, use the cubic fit equation instead:
Y=A+B1*X+B2*X 2+B3*X 3
Adopt least square method to carry out obtaining the value of parameter A, B1, B2, B3 behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation.
The semiconductor laser that described laser instrument 3 adopts with single-mode tail fiber output is easily realized the Laser output of laser intensity modulation and high coupling efficiency, and laser instrument 3 works in the intensity modulation mode, to avoid extraneous parasitic light and environmental change to the interference of signal.
Described optical fiber collimator 6 has improved the coupling efficiency of flashlight, and has avoided discrete end of probe to the susceptibility of environmental change simultaneously as laser input and signal receiver spare.Described fiber optical circulator 5 effective separations input light and flashlight avoid the rear orientation light nonlinear effect to cause the variation of signal spectrum.Insertion loss≤the 0.8dB of described fiber optical circulator 5, isolation 〉=40dB, the precision of energy Effective Raise systematic survey;
Described the first optical fiber 4, three fiber port circulators 5, optical fiber collimator 6, the second optical fiber 7 all adopt the single-mode fiber device, have loss and hang down and the little characteristics of volume, can realize the on-line monitoring of liquid turbidity under the remote small space; Described fiber optical circulator 5 and optical fiber collimator 6 are selected high temperature resistant device according to practical application, and maximum temperature is selected 150 or 300 degrees centigrade or carry out withstand voltage heat insulation packed, to realize the liquid turbidity on-line monitoring under the abominable measurement environment.
Optical fiber type laser liquid turbidimetry method may further comprise the steps:
The first step, laser instrument 3 output modulation light intensity shine on the testing liquid sample through the first optical fiber 4, three fiber port circulators 5, optical fiber collimator 6 respectively;
Second step, feed back to optical fiber collimator 6 through the part rear orientation light after the scattering of testing liquid sample endoparticle thing, and export through three fiber port circulators 5 the 3rd port, be transferred to photodetector 8 through the second optical fiber 7, photodetector 8 changes light signal into electric signal, electric signal amplify through signal again and demodulation module 9 amplifications and demodulation after deliver to single-chip microcomputer 1, obtain signal voltage amplitude after the demodulation by single-chip microcomputer 1;
The 3rd step, according to ISO7027, utilizing the GBW12001 standard substance is the formal chaste tree titer that 400NTU formal chaste tree titer is prepared a plurality of different turbidity, optical fiber collimator 6 is fixed in the cylindrical container, begin to measure with the 0NTU ultrapure water first, record rear orientation light magnitude of voltage is worth as a setting, the equal subtracting background value of later measured value, then in cylindrical container, add formal chaste tree turbidity standard and recording voltage value, afterwards turbidity liquid is poured out, clean cylindrical container and sensor probe, the formal chaste tree titer that adds again next turbidity, again write down the turbidity value of the photovoltage that signal amplifies and demodulation module 9 obtains and the formal chaste tree solution of preparing, constantly repeat to add the formal chaste tree solution of different turbidity and the photovoltage on tracer signal amplification and the demodulation module 9, until 400NTU formal chaste tree titer obtains 6 groups of above corresponding data;
The 4th step, respectively with the magnitude of voltage that measures and standard turbidity value as coordinate in length and breadth, draw signal voltage amplitude and turbidity variation relation curve;
In the 5th step, the data that measure are carried out linear fit:
Y=A+B*X
Y representation signal voltage magnitude wherein, X represents turbidity value, and A and B are respectively the linear fit parameter.Adopt least square method to carry out obtaining the value of parameter A and B behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation;
When the error of matched curve and measured value surpasses 2%, use the cubic fit equation instead:
Y=A+B1*X+B2*X 2+B3*X 3
Adopt least square method to carry out obtaining the value of parameter A, B1, B2, B3 behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation;
The 6th step, then optical fiber collimator 6 parts of turbidity meter are put into testing liquid, signal amplitude and the standard turbidity and the voltage magnitude variation relation that draw of single-chip microcomputer 1 gained are compared, draw liquid turbidity information.
Liquid turbidity measuring principle of the present invention is as follows: can judge situation and the distribution of particle in the water by measuring scattered light, scattered light intensity and relevant with factors such as mean particle dia size, lambda1-wavelength, incident intensities in the distribution in space.Generally we pay close attention to the scattering phenomenon that larger particles causes, when the radius of suspended particle in the water during more than or equal to optical wavelength, the scattered light intensity that record on the back scattering angular direction this moment is obeyed Mie scattering theorem.At incident wavelength λ, incident intensity I 0, scattering light path r, tested particle diameter size parameter k, refractive index m and situation that scatteringangleθ is all determined under, scattered light intensity just is directly proportional with population concentration, namely is directly proportional with turbidity, and at incident light I 0In the constant situation, the scattered light intensity that the MieShi theorem calculates can be reduced to:
I r=KT
Therefore, no matter how many sizes of particle is, in the water back scattering light intensity always with turbidity T relation in direct ratio, only need in the actual measurement COEFFICIENT K demarcated with turbidity standard and just can calculate turbidity value by the back scattering light intensity after obtaining.
The present invention's advantage compared with prior art is:
(1) the present invention adopts fiber optical circulator and optical fiber collimator structure, Laser emission and signal detection system unite two into one, avoided that system variant has greatly improved the stability of measuring system to the impact of acquisition of signal under the conditions such as ambient temperature variation, vibration.
(2) the present invention adopts Back turbidimetry principle, and adopts fiber optical circulator to realize effective isolation (isolation is greater than 50dB) of transmission laser and flashlight, can realize the Measurement accuracy of low turbidity.
(3) the present invention adopts full optical fiber type detecting structure, is fit to the rugged surroundings such as High Temperature High Pressure and strong electromagnetic; The volume of full optical fiber type probe is very little, and the liquid turbidity that is fit to small space is surveyed.
(4) single-mode fiber is all adopted in the transmission of laser of the present invention and signal, namely can realize the long-range detection of liquid turbidity, has avoided the interference such as electromagnetism of outer bound pair light signal in signals transmission.
Description of drawings
Fig. 1 is optical fiber type laser liquid turbidity meter structural representation among the present invention.
Embodiment
As shown in Figure 1, measurement mechanism of the present invention comprises: single-chip microcomputer 1, laser modulation module 2, laser instrument 3, the first optical fiber 4, three fiber port circulators 5, optical fiber collimator 6, the second optical fiber 7, photodetector 8, signal amplify and demodulation module 9; Described laser instrument 3 is after laser modulation module 2 is carried out intensity modulation, laser is transferred to the first port of three fiber port circulators 5 through the first optical fiber 4, then the second port from three fiber port circulators 5 outputs to optical fiber collimator 6, return and output to the second optical fiber 7 from the 3rd port of three fiber port circulators 5 through optical fiber collimator 6 through particles in liquid scattering rear portion light from the light of optical fiber collimator outgoing, then by photodetector 8 light signal is converted into electric signal, electric signal amplified by signal and demodulation module 9 processing after deliver to single-chip microcomputer 1.
Wherein laser instrument 3 is for having the semiconductor DFB of good modulating characteristic and built in light isolator and refrigerator, the output of band tail optical fiber, the first optical fiber 4 and the second optical fiber 7 are the single mode silica fibre, photodetector 8 is high sensitivity avalanche photodetector module, with the remote transmission (0-10KM) of guaranteeing laser signal and the highly sensitive detection of scattered light.
Measuring method performing step of the present invention is as follows:
(1) single-chip microcomputer 1 passes through gating pulse order-driven laser modulation module 2, and then laser instrument 3 is carried out square-wave frequency modulation (general dutycycle is chosen as 50%);
(2) laser instrument 3 output square-wave frequency modulation light intensity shine on the testing liquid sample through the first optical fiber 4, three fiber port circulators 5, optical fiber collimator 6 successively;
(3) feed back to optical fiber collimator 6 through the part rear orientation light after the scattering of testing liquid sample endoparticle thing, and export through three fiber port circulators 5 the 3rd port, be transferred to photodetector 8 through the second optical fiber 7, photodetector 8 changes the modulation of luminous power into the luminous power electric signal;
(4) electric signal again input signal amplify and demodulation module 9: be amplified into bandwidth-limited circuit through one-level, the fundamental signal that produces behind the bandpass filtering enters full-wave rectification and low pass circuit again, obtains the direct current signal of low frequency, namely finishes the average detection;
(5) signal after amplifying through secondary is delivered to single-chip microcomputer 1, obtains the signal voltage amplitude after the demodulation;
(6) according to ISO7027, formal chaste tree titer is used in the demarcation of water turbidity detection system, utilize the mark liquid of a plurality of different turbidity of GBW12001 standard substance (400NTU formal chaste tree titer) preparation, the optical fiber collimator 6 of turbidity meter is fixed in the cylindrical container, begin to measure with the 0NTU ultrapure water first, record rear orientation light magnitude of voltage is worth as a setting, the equal subtracting background value of later measured value, then in cylindrical container, add formal chaste tree turbidity standard and recording voltage value, afterwards turbidity liquid is poured out, clean container and probe, the titer that adds again next turbidity is write down the turbidity value of signal voltage amplitude and the formal chaste tree solution of preparing again.Constantly repeat to add the formal chaste tree solution of different turbidity and the photovoltage on tracer signal amplification and the demodulation module 9, until 400NTU formal chaste tree titer obtains 6 groups of above corresponding data;
(7) respectively with the magnitude of voltage that measures and standard turbidity value as coordinate in length and breadth, draw signal voltage amplitude and turbidity variation relation curve;
(8) data that measure are carried out linear fit:
Y=A+B*X
Y representation signal voltage magnitude wherein, X represents turbidity value, and A and B are respectively the linear fit parameter.Adopt least square method to carry out obtaining the value of parameter A and B behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation;
(9) when the error of matched curve and measured value surpasses 2%, use the cubic fit equation instead:
Y=A+B1*X+B2*X 2+B3*X 3
Adopt least square method to carry out obtaining the value of parameter A, B1, B2, B3 behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation;
(10) then optical fiber collimator 6 parts of turbidity meter are put into testing liquid, signal amplitude and the standard turbidity and the voltage magnitude variation relation that draw of single-chip microcomputer 1 gained are compared, draw liquid turbidity information.
In a word, realize the accurate on-line measurement of liquid turbidity under remote, small space and other complex environments.The present invention is simple in structure, be easy to realize, stability is high, and the practicality, the security that have effectively improved the liquid turbidity measuring system provide technical guarantee for carrying out long-term online water quality monitoring.
The content that is not described in detail in the instructions of the present invention belongs to the known prior art of this area professional and technical personnel.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (6)

1. optical fiber type laser liquid turbidity meter, it is characterized in that: adopt all optical fibre structure of fiber optical circulator and collimating apparatus, comprise that single-chip microcomputer (1), laser modulation module (2), laser instrument (3), the first optical fiber (4), three fiber port circulators (5), optical fiber collimator (6), the second optical fiber (7), photodetector (8), signal amplify and demodulation module (9); Described laser modulation module (2) is carried out intensity modulation to laser instrument (3), to avoid extraneous parasitic light and environmental change to the interference of signal, laser after the modulation is transferred to the first port of three fiber port circulators (5) through the first optical fiber (4), then the second port from three fiber port circulators (5) outputs to optical fiber collimator (6), light from optical fiber collimator (6) outgoing incides on the testing liquid sample, feed back to optical fiber collimator (6) through the part rear orientation light after the scattering of testing liquid sample endoparticle thing, be that optical fiber collimator (6) is simultaneously as laser input and flashlight receiving device, in the coupling efficiency that improves scattered light, also avoided discrete detecting structure to the hypersensitivity of environmental change, and embody the advantage that volume is little and need not to power, scattered light is through the three port output of optical fiber collimator (6) from three fiber port circulators (5), effective separation input light and flashlight also avoids the rear orientation light nonlinear effect to cause the variation of signal spectrum, the scattered light of exporting from the 3rd port of three fiber port circulators (5) is coupled to the second optical fiber (7), then by photodetector (8) light signal is converted into electric signal, electric signal is delivered to single-chip microcomputer (1) after being processed by signal amplification and demodulation module (9), obtain signal voltage amplitude after the demodulation by single-chip microcomputer (1), the signal amplitude of single-chip microcomputer (1) gained and standard turbidity and voltage magnitude variation relation are compared, drawn liquid turbidity information;
Described standard turbidity is obtained by following process with the voltage magnitude variation relation: the standard formal chaste tree titer of optical fiber collimator (6) being put into respectively 6 groups of above different turbidity, by obtaining corresponding signal voltage amplitude after signal amplification and demodulation module (9) processing, respectively with the magnitude of voltage that measures and standard turbidity value as coordinate in length and breadth, draw signal voltage amplitude and turbidity variation relation curve, the data that measure carried out linear fit:
Y=A+B*X
Wherein, Y representation signal voltage magnitude, X represents turbidity value, and A and B are respectively the linear fit parameter; Adopt least square method to carry out obtaining the value of parameter A and B behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation; When the error of matched curve and measured value surpasses 2%, use the cubic fit equation instead:
Y=A+B1*X+B2*X 2+B3*X 3
Adopt least square method to carry out obtaining the value of parameter A, B1, B2, B3 behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation.
2. 1 described optical fiber type laser liquid turbidity meter as requested, it is characterized in that: described laser instrument (3) adopts the semiconductor laser with single-mode tail fiber output, easily realizes the Laser output of laser intensity modulation and high coupling efficiency.
3. 1 described optical fiber type laser liquid turbidity meter as requested is characterized in that: insertion loss≤0.8dB, the isolation 〉=40dB of described fiber optical circulator (5), precision that can the Effective Raise systematic survey.
4. 1 described optical fiber type laser liquid turbidity meter as requested, it is characterized in that: described the first optical fiber (4), three fiber port circulators (5), optical fiber collimator (6), the second optical fiber (7) all adopt the single-mode fiber device, have loss and hang down and the little characteristics of volume, can realize the on-line monitoring of liquid turbidity under the remote small space.
5. 1 described optical fiber type laser liquid turbidity meter as requested, it is characterized in that: described fiber optical circulator (5) and optical fiber collimator (6) are selected high temperature resistant device according to practical application, maximum temperature is selected 150 or 300 degrees centigrade or carry out withstand voltage heat insulation packed, to realize the liquid turbidity on-line monitoring under the abominable measurement environment.
6. adopt the measuring method of optical fiber type laser liquid turbidity meter claimed in claim 1, it is characterized in that may further comprise the steps:
The first step, laser instrument (3) output modulation light intensity incides on the testing liquid sample through the first optical fiber (4), three fiber port circulators (5), optical fiber collimator (6) respectively;
Second step, feed back to optical fiber collimator (6) through the part rear orientation light after the scattering of testing liquid sample endoparticle thing, and export through three fiber port circulators (5) the 3rd port, be transferred to photodetector (8) through the second optical fiber (7), photodetector (8) changes light signal into electric signal, electric signal amplify through signal again and demodulation module (9) amplification and demodulation after deliver to single-chip microcomputer (1), obtain signal voltage amplitude after the demodulation by single-chip microcomputer (1);
The 3rd step, according to ISO7027, utilizing the GBW12001 standard substance is the formal chaste tree titer that 400NTU formal chaste tree titer is prepared a plurality of different turbidity, optical fiber collimator (6) is fixed in the cylindrical container, begin to measure with the 0NTU ultrapure water first, record rear orientation light magnitude of voltage is worth as a setting, the equal subtracting background value of later measured value, then in cylindrical container, add formal chaste tree turbidity standard and recording voltage value, afterwards turbidity liquid is poured out, clean cylindrical container and sensor probe, the formal chaste tree titer that adds again next turbidity, again write down the turbidity value of the photovoltage that signal amplifies and demodulation module (9) obtains and the formal chaste tree solution of preparing, constantly repeat to add the formal chaste tree solution of different turbidity and the photovoltage on tracer signal amplification and the demodulation module (9), until 400NTU formal chaste tree titer obtains 6 groups of above corresponding data;
The 4th step, respectively with the magnitude of voltage that measures and standard turbidity value as coordinate in length and breadth, draw signal voltage amplitude and turbidity variation relation curve;
In the 5th step, the data that measure are carried out linear fit:
Y=A+B*X
Y representation signal voltage magnitude wherein, X represents turbidity value, and A and B are respectively the linear fit parameter.Adopt least square method to carry out obtaining the value of parameter A and B behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation;
When the error of matched curve and measured value surpasses 2%, use the cubic fit equation instead:
Y=A+B1*X+B2*X 2+B3*X 3
Adopt least square method to carry out obtaining the value of parameter A, B1, B2, B3 behind the linear fit, and draw matched curve, be i.e. standard turbidity and voltage magnitude variation relation;
The 6th step, then optical fiber collimator (6) part of turbidity meter is put into testing liquid, signal amplitude and the standard turbidity and the voltage magnitude variation relation that draw of single-chip microcomputer (1) gained are compared, draw liquid turbidity information.
CN201210401753.4A 2012-10-19 2012-10-19 Optical fiber type laser liquid turbidity measuring device and measuring method Expired - Fee Related CN102914519B (en)

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