CN103323427A - On-line self-calibration turbidity meter and turbidity detection method - Google Patents
On-line self-calibration turbidity meter and turbidity detection method Download PDFInfo
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- CN103323427A CN103323427A CN2013102054571A CN201310205457A CN103323427A CN 103323427 A CN103323427 A CN 103323427A CN 2013102054571 A CN2013102054571 A CN 2013102054571A CN 201310205457 A CN201310205457 A CN 201310205457A CN 103323427 A CN103323427 A CN 103323427A
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Abstract
The invention relates to an on-line self-calibration turbidity meter and a turbidity detection method, belonging to a liquid turbidity detection field. The system is composed of a light source (1), an optical detector (2) for measuring, an optical detector (3) for calibrating, a reflection and transmission component (4), and a liquid (5) to be detected; the said components satisfied the following relation: the after the light from the light source (1) passes through the reflection and transmission component (4), partial light transmits along an original light direction, goes into the liquid (5) with the turbidity to be detected, and then goes into the optical detector (2) for measuring after scattered; and after the light from the light source (1) passes through the reflection and transmission component (4), partial light is reflected by the reflection and transmission component (4), and reflected light goes into the optical detector (3) for calibrating. The system and the method can solve the problem that a traditional turbidity meter needs regular or irregular off line artificial calibration to the light source in a using process.
Description
Technical field
The present invention relates to a kind of online self-alignment turbidimeter system and turbidity detection method, belong to the liquid turbidity fields of measurement.
Background technology
Along with the day by day raising of people's environmental consciousness and living standard, people have proposed more and more higher requirement to the quality control of various water bodys and other liquid, and turbidity is exactly one of most important index of weighing liquid quality.The current international standard that mainly contains two kinds of turbidimetries.A kind of is the ISO7027 standard, mainly uses in Europe, and the wavelength of this standard-required light source is 860nm, and normal operation light emitting diode (LED) light source also can use tungsten lamp in conjunction with optical filter, and the spectral bandwidth of light source is necessary for 860 ± 30nm.Another kind is the USEPA180.1 standard, and the main U.S. that comprises in the area of outside Europe uses, and this standard-required light source is tungsten lamp, and between the 3000K, the peak in the spectral response of detecting device must be between 400～600nm at 2200K for colour temperature.These two kinds of standards all require to measure with being the vertical placement of 90 degree between photo-detector and the light source.The present invention is suitable for these two kinds of standards.
Usually can not solve the especially long-term problem of using rear light intensity attenuation of light source of light source self Strength Changes in the method for current measurement turbidity, so turbidimeter commonly used all requires Application standard turbidity liquid etc. regularly or aperiodically manually turbidimeter to be carried out off-line calibration (every three months is demarcated once usually), not only need to spend a large amount of manpower and materials, and not very real under many circumstances, be contained in the place that is difficult to contact such as turbidimeter, perhaps demarcate the needs that can affect continuous on-line monitoring, etc.The present invention designs for head it off.
Summary of the invention
The object of the present invention is to provide a kind of not requiring regularly or aperiodically online self-alignment turbidimeter system and the turbidity detection method of artificial off-line calibration.
A kind of online self-alignment turbidimeter system is characterized in that: by light source, measure with photo-detector, calibration with photo-detector, reflection and transmission parts, testing liquid; Form with corresponding path channels, electronic signal amplification, treatment circuit and mechanical part; Described light source, measurement are satisfied following relation with photo-detector, calibration with the position of photo-detector, reflection and transmission parts: the light that light source sends is by behind the reflection and transmission parts, part is along former radiation direction transmissive, enter the liquid of turbidity to be measured, enter after being scattered to measure and use photo-detector; The light that light source sends is by behind the reflection and transmission parts, and part is reflected the transmitting member reflection, and reflection ray enters the calibration photo-detector.
Described online self-alignment turbidimeter system, it is characterized in that: reflection and transmission parts testing liquid can contact preferably not contact between the two but leave certain clearance and not contact,, can avoid testing liquid to pollute the reflection and transmission parts.
Described online self-alignment turbidimeter system, it is characterized in that: above-mentioned testing liquid is positioned at container, and container upper surface is the inclined-plane, and this inclined-plane is described reflection and transmission parts; Container has water inlet and water delivering orifice.
Described light source typical component is light emitting diode, and measuring with the photo-detector typical component is silicon photo diode, and calibration is silicon photo diode with the photo-detector typical component, and the reflection and transmission parts are generally the light transmission piece that optical glass is made.
Utilize the turbidity detection method of online self-alignment turbidimeter system, it is characterized in that comprising following process: the light that light source sends is by behind the reflection and transmission parts 4, part is along former radiation direction transmissive, enter the liquid of turbidity to be measured, enter after being scattered to measure and use photo-detector, measure with photo-detector 2 measured signals this moment is S2; Measuring with the measured signal of photo-detector when light source is closed is S20; The light that light source 1 sends is by behind the reflection and transmission parts 4, and part is reflected transmitting member 4 and reflects back, and enters the calibration photo-detector; The signal S1 that calibration records with photo-detector; Calibration was S10 with the measured signal of photo-detector when light source 1 was closed; Calculate turbidity T:T=η * (S2-S20)/(S1-S10) by following formula, wherein η is a scale-up factor, tests definite by the method that carries out curve fitting behind the measurement standard turbidity sample.
Alignment of the present invention is irrelevant with signal and testing liquid that photo-detector records, by and only determined by the reflectance of light signal intensity and transmitting member, and the reflectance of transmitting member can be considered time-independent constant, therefore calibrate the signal S1 that records with photo-detector and can be used as the light signal intensity reference, compare with the measured signal S2 of photo-detector with measurement, can obtain not relying on the turbidity information T after the calibration of light signal intensity, thus avoided to light source regularly or irregularly calibration; Calibration is with light detector readings S10 with measure with light detector readings S20 when usually going back the sampled measurements light source during actual the use and closing.
Description of drawings
Fig. 1 is principle schematic of the present invention; Thin arrow is depicted as the light transmition direction among the figure;
Fig. 2 is the front schematic view of first embodiment of the invention; Thin arrow is depicted as the light transmition direction among the figure, and thick arrow is depicted as liquid flow direction;
Fig. 3 is the front schematic view of second embodiment of the invention; Thin arrow is depicted as the light transmition direction among the figure, and thick arrow is depicted as liquid flow direction;
Number in the figure title: 1, light source, 2, measure and use photo-detector, 3, calibrate and use photo-detector, 4, light transparent member, 5, testing liquid, 6, container, 7, water inlet, 8, water delivering orifice.
Embodiment
As shown in Figure 1, the placement angle of inclination of reflection and transmission parts 4 need to guarantee calibration photo-detector 3 satisfied following formula: 2 α=arctan (L1/L2); Wherein α is the angle of reflection and transmission parts 4 normal directions and light source 1 incident direction, and L1 is light source 1 and the calibration distance between photo-detector 3 centers, and L2 is that incident ray is from light source 1 to the distance the reflection and transmission parts 4.
The beam projecting face of the plane of light incidence of usually measurement usefulness photo-detector 2 and light source 1 is vertical in addition.
One of embodiment:
As shown in Figure 2, use the optical glass light transmission piece as reflection and transmission parts 4, testing liquid is not full of container, and liquid has the clearance between the light transmission piece, and the two is directly contact not; Water inlet and water delivering orifice are at homonymy not.
Two of embodiment:
Use as shown in Figure 3 the optical glass light transmission piece as reflection and transmission parts 4, testing liquid is full of container, and liquid does not have the clearance between the light transmission piece, and the two directly contacts; Water inlet and water delivering orifice are in the same side.
As mentioned above, the present invention can be applied to use the turbidimeter of various criterion; Light source can use light emitting diode, also can use tungsten lamp, can use also and can not use optical filter; Testing liquid can contact reflex transmitting member 4, also can not contact reflex transmitting member 4; Water inlet and water delivering orifice can be homonymy can be in the same sides yet.The present invention also can promote the use of other devices that need to carry out online or real-time light intensity calibration, includes but not limited to use light emitting diode as the measurement instrument of light source, uses tungsten lamp as the measurement instrument of light source, etc.
Above application all should consist of a part of the present invention.
Claims (4)
1. online self-alignment turbidimeter system is characterized in that:
By light source (1), measurement photo-detector (2), calibration photo-detector (3), reflection and transmission parts (4), testing liquid (5); Form with corresponding path channels, electronic signal amplification, treatment circuit and mechanical part;
Described light source (1), measurement are satisfied following relation with photo-detector (2), calibration with the position of photo-detector (3), reflection and transmission parts (4): after the light that light source (1) sends passes through reflection and transmission parts (4), part is along former radiation direction transmissive, enter the liquid (5) of turbidity to be measured, enter after being scattered and measure with photo-detector (2); The light that light source (1) sends is by behind the reflection and transmission parts (4), and part is reflected transmitting member (4) reflection, and reflection ray enters calibration photo-detector (3).
2. described online self-alignment turbidimeter system according to claim 1 is characterized in that:
Described reflection and transmission parts (4) do not contact with testing liquid (5), and both leave the clearance.
3. described online self-alignment turbidimeter system according to claim 1, it is characterized in that: above-mentioned testing liquid (5) is positioned at container (6), and container (6) upper surface is the inclined-plane, and this inclined-plane is described reflection and transmission parts (4); Container (6) has water inlet (7) and water delivering orifice (8).
4. utilize the turbidity detection method of the online self-alignment turbidimeter of claim 1 system, it is characterized in that comprising following process:
The light that light source (1) sends is by behind the reflection and transmission parts (4), part is along former radiation direction transmissive, enter the liquid (5) of turbidity to be measured, enter after being scattered and measure with photo-detector (2), measure with the measured signal of photo-detector (2) this moment is S2; Light source (1) is measured with the measured signal of photo-detector when closing be S20;
The light that light source (1) sends is by behind the reflection and transmission parts (4), and part is reflected transmitting member (4) and reflects back, and enters calibration photo-detector (3); The signal that calibration records with photo-detector (3) is S1; Light source (1) is calibrated with the measured signal of photo-detector when closing be S10;
Calculate turbidity T:T=η * (S2-S20)/(S1-S10) by following formula, wherein η is a scale-up factor, tests definite by the method that carries out curve fitting behind the measurement standard turbidity sample.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122231A (en) * | 2014-08-07 | 2014-10-29 | 北京华源精益传感技术有限公司 | On-line self-calibration water quality turbidity detection system |
| WO2015161748A1 (en) * | 2014-04-24 | 2015-10-29 | 中石化石油工程设计有限公司 | Measurement method for un-gated liquid turbidity measurement device based on time-correlated single photon counting |
| CN105466928A (en) * | 2015-11-17 | 2016-04-06 | 重庆市科学技术研究院 | Calibration treatment method of turbidity sensor |
| CN109564161A (en) * | 2016-10-25 | 2019-04-02 | 哈希公司 | Bottle and closure for turbidity standard |
| CN109855726A (en) * | 2019-01-03 | 2019-06-07 | 桂林优利特医疗电子有限公司 | A kind of calibrating installation and method of the light source power of Immune scatter turbidimetry |
| CN110726698A (en) * | 2019-11-28 | 2020-01-24 | 浙江农林大学 | Turbidity monitoring method for urban river ecological intelligent monitoring parent station |
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| US5912737A (en) * | 1998-06-01 | 1999-06-15 | Hach Company | System for verifying the calibration of a turbidimeter |
| CN201233365Y (en) * | 2008-08-04 | 2009-05-06 | 湖南工程学院 | Air turbidity detection device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015161748A1 (en) * | 2014-04-24 | 2015-10-29 | 中石化石油工程设计有限公司 | Measurement method for un-gated liquid turbidity measurement device based on time-correlated single photon counting |
| CN104122231A (en) * | 2014-08-07 | 2014-10-29 | 北京华源精益传感技术有限公司 | On-line self-calibration water quality turbidity detection system |
| CN104122231B (en) * | 2014-08-07 | 2017-01-11 | 北京华源精益传感技术有限公司 | On-line self-calibration water quality turbidity detection system |
| CN105466928A (en) * | 2015-11-17 | 2016-04-06 | 重庆市科学技术研究院 | Calibration treatment method of turbidity sensor |
| CN105466928B (en) * | 2015-11-17 | 2017-12-19 | 重庆市科学技术研究院 | A kind of demarcation processing method of turbidity transducer |
| CN109564161A (en) * | 2016-10-25 | 2019-04-02 | 哈希公司 | Bottle and closure for turbidity standard |
| CN109564161B (en) * | 2016-10-25 | 2021-11-26 | 哈希公司 | Bottle and cap for turbidity standard liquids |
| CN109855726A (en) * | 2019-01-03 | 2019-06-07 | 桂林优利特医疗电子有限公司 | A kind of calibrating installation and method of the light source power of Immune scatter turbidimetry |
| CN110726698A (en) * | 2019-11-28 | 2020-01-24 | 浙江农林大学 | Turbidity monitoring method for urban river ecological intelligent monitoring parent station |
| CN110726698B (en) * | 2019-11-28 | 2022-02-22 | 浙江农林大学 | Turbidity monitoring method for urban river ecological intelligent monitoring parent station |
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Application publication date: 20130925 |