CN100362336C - Infra-red light ratio pulsation detecting apparatus and detecting method for shape of flocculation in water - Google Patents
Infra-red light ratio pulsation detecting apparatus and detecting method for shape of flocculation in water Download PDFInfo
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- CN100362336C CN100362336C CNB2004100441320A CN200410044132A CN100362336C CN 100362336 C CN100362336 C CN 100362336C CN B2004100441320 A CNB2004100441320 A CN B2004100441320A CN 200410044132 A CN200410044132 A CN 200410044132A CN 100362336 C CN100362336 C CN 100362336C
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Abstract
The present invention relates to an infrared light ratio pulsation detection device and a detection method for the shape of floccules in water, which discloses an optical detection technique for the shape of floccules in water treatment. The present invention is characterized in that a transmitted light detector 6 is arranged on the inner side of a second transparent window 2, and is corresponding to an infrared source 5 arranged on the inner side of a first transparent window 1; a scattered light detector 7 is arranged on the inner side of a third transparent window 3 which is perpendicular to the infrared source 5; electrical signals which are output by the transmitted light detector 6 and the scattered light detector 7 are converted into digital signals, and the digital signals are input into a microprocessor 10; the digital signals of the scattered light intensity are processed by the microprocessor 10, the effective value of a pulsation component is extracted, the natural logarithm of the reciprocal of the average digital signal value of transmitted light intensity is divide by squared value of the effective value, and the ratio calculating result is used as the final effective digital signal of the shape of floccules in reaction water and output through a communication interface. The method of the present invention can be used for the on-line detection of the shape of the floccules in water (an essential parameter which influences the flocculation effect); the detection device of the present invention has the characteristics of low investment, favorable effect, easy operation, etc., and is especially suitable for controlling the charging quantity of flocculating agents in a water treatment process.
Description
Technical field:
The invention belongs to a kind of flocculu shape optical detecting method that is applied to water treatment flocculation dispensing technology.
Background technology:
Flocculation is a most important treatment process in the water cleaning systems, also is the chief component of water producing cost, and whether flocculating agent throwing amount accurately directly has influence on the overall process of water treatment.Traditional flocculation dispensing detects control technology and mainly contains: need to detect every apparent parameter (flow of former water, turbidity, pH value, basicity, the temperature that influences flocculating effect, the flow of polycoagulant, concentration, usefulness etc.) mathematical model method, the short cut technique of test section parameter, detect the semi-automatic method of above-mentioned one or two parameter, model filter tank method or model inclined tube method etc.The shortcoming that they exist all that investment is big, reliability is low, modeling is difficult, low precision, Operation and Maintenance difficulty etc. can't overcome, thereby can't widespread use.Existing general detecting instrument can not on-line continuous be measured the variation of the flocculating degree and the flocculation particle diameter of water, can only come the indirect reaction flocculating degree by detecting dispensing back some characteristic relevant with suspended particulate matter in the water; As based on the streaming current detection technique (SCD) of suspended particle zeta potential and based on the filterable kapillary respiratory time of suspension technology (CST) etc.These detection techniques all have certain limitation, that is to say, after if suspended particle is had an effect in employed flocculating agent and the water, this specific character of suspended particle does not change or when changing very little (as zeta potential) or being difficult to detect (as the kapillary respiratory time) more, so, the detection method accuracy and the sensitivity of these indirect reaction flocculating degrees will reduce, even can not use.
Summary of the invention:
The objective of the invention is provides a kind of water flocculu shape infrared light ratio pulsation detecting device and detection method that is used for water treatment flocculation dispensing technology in order to overcome flocculu shape detection method and big, the shortcomings such as reliability is low, modeling is difficult, low precision, Operation and Maintenance difficulty of the existing investment of device in traditional water.Characteristics such as it has reduced investment, precision height, reliability is high and easy to operate, flocculu shape infrared light ratio pulsation detection method in the water, it is realized by following steps: one, by infrared light supply 5 the infrared laser line is passed and add flocculating agent also through the detected water sample after stirring; Two, use transmitted light detector 6 to receive the infrared laser line that passes detected water sample, receive the infrared laser line in direction with light scattering detector 7 simultaneously and shine the scattered light that produces behind the detected water sample perpendicular to the infrared laser line; Three, transmitted light detector 6 converts the light signal that receives and the proportional transmitted light electric signal of light intensity to, and light scattering detector 7 converts the light signal that receives and the proportional scattered light electric signal of light intensity to simultaneously; Four, the scattered light electric signal of the transmitted light electric signal of transmitted light detector 6 output and light scattering detector 7 outputs is input to microprocessor 10 after converting digital signal to through No. one analog to digital converter 8 and No. two analog to digital converters 9 respectively; Five, microprocessor 10 transmits from No. one analog to digital converter 8 and calculates average transmitted intensity digital signal value T the digital signal
a,, 10 pairs of digital signals that transmit from No. two analog to digital converters 9 of microprocessor are handled, and extract its pulsation composition effective value S
p, obtain the final significant figure signal that ratio operation result α value is flocculu shape in the reflection water: α=S with following formula
p 2/ ln (32768/T
a).
The infrared laser of infrared light supply 5 emission through good transparent window 1 vertical irradiation of light transmission in the water that flows.Because the floc particle size in the water after the dispensing is less than the half-wave wavelength of infrared laser, thereby irradiation light not only weakens to some extent owing to luminous energy is absorbed the brightness that makes through behind the water sample, also scattering will take place.The transmitted light beam that sees through water sample shines on the transmitted light detector 6 by No. two transparent windows 2 in opposite, scattered beam is then by shining on the light scattering detector 7 with perpendicular No. three transparent windows 3 of infrared light supply 5, transmitted light detector 6 converts optical signal transmissive and the proportional electric signal of transmitted intensity to, light scattering detector 7 converts scattered light signal and the proportional electric signal of scattered light intensity to, the output electric signal of transmitted light detector and light scattering detector converts digital signal to through analog to digital converter and is input to and carries out analyzing and processing in the microprocessor, and operation result sends external control devices to by communication interface.Because in the technology water sample, the STOCHASTIC DIFFUSION of floc particle can make contained floc particle number concentration random variation in the certain volume, promptly produces pulsation phenomenon, Poisson distribution is deferred in this variation.When narrow infrared laser shines water sample; will inevitably produce the fluctuation of scattered light; for the floc particle of large-size can the appreciable impact scattered light the pulsation situation, make the scattered light degree of pulsatility bigger, thereby can determine the size of floc particle by the pulsation situation of scattered light intensity.Scattered light intensity digital signal after the analog to digital converter conversion can be regarded as by two parts and form, and a part is average scattering light intensity value g, and another part is ripple component effective value S
p, produce by floc particle random variation in the water.Ripple component effective value S
pMay be very little, but it can be separated from the scattered light intensity digital signal through digital amplification.Microprocessor is handled the scattered light intensity digital signal, extracts its pulsation composition effective value S
p, with its square value divided by average transmitted intensity digital signal value T
aNatural logarithm reciprocal is to eliminate the influence of floc particle concentration to the ripple component size, i.e. α=S
p 2/ ln (32768/T
a).Ratio operation result α value is the final significant figure signal of flocculu shape in the reaction water, and its value is big more, represents flocculating effect good more.Device of the present invention is a kind of optical detection apparatus, but with other various detecting devices based on photoresistance plug or light scattering the internal difference is arranged.This instrument can calculate the variation that the flocculation back forms the floc unit particle diameter rapidly with shining in the fluctuation status of the scattered light intensity of current water, thereby highly sensitive, response rapidly.No matter use which kind of flocculating agent, by which kind of mechanism flocculate, the relative size of floc unit particle diameter is as long as change to some extent, and this device can indicate its flocculating degree accurately, delicately continuously.Be specially adapted to the control of water technology flocculating agent throwing amount; Method of the present invention can online detection influences essential parameter---the flocculu shape in the water of flocculating effect, so only need measure and control this independent factor, just can realize that flocculant dosage accurately controls, or else need monitor any original water gauge and see water quality parameter (turbidity, temperature, basicity, pH value etc.) and water yield parameter (raw water flow, medicinal liquid flow, concentration etc.).
Description of drawings:
Fig. 1 is the structural representation of flocculu shape infrared light ratio pulsation detecting device in the water of the present invention, and Fig. 2 is with flocculu shape scattered light electric signal synoptic diagram in the detected water of the inventive method.
Embodiment:
Embodiment one: specify present embodiment below in conjunction with Fig. 1.Device of the present invention is by infrared light supply 5, light scattering detector 7, transmitted light detector 6, No. one analog to digital converter 8, No. two analog to digital converters 9, microprocessor 10, communication interface 11, a transparent window 1, No. two transparent windows 2, No. three transparent windows 3 and sensor housing 4 are formed, infrared light supply 5, light scattering detector 7, transmitted light detector 6, No. one analog to digital converter 8, No. two analog to digital converters 9 are arranged in the sensor housing 4, a transparent window 1, No. two transparent windows 2, No. three transparent windows 3 are embedded on the sensor housing 4 and sensor housing 4 and seal, it is inboard and be oppositely arranged to receive the infrared laser line with the infrared light supply 5 that is installed in transparent window 1 inboard that transmitted light detector 6 is installed in No. two transparent windows 2, light scattering detector 7 is arranged on No. three transparent window 3 inboards perpendicular with the line of infrared light supply 5 and transmitted light detector 6, the output terminal of transmitted light detector 6 connects the input end of No. one analog to digital converter 8, the output terminal of light scattering detector 7 connects the input end of No. two analog to digital converters 9, the output terminal of No. one analog to digital converter 8 and No. two analog to digital converters 9 is connected on two input ends of microprocessor 10, and the output terminal of microprocessor 10 connects the input end of communication interface 11.Final significant figure signal is exported to external unit by communication interface.The device of present embodiment is work like this: use above-mentioned device, housing 4 is immersed in the adding flocculating agent and through in the detected water sample after stirring, water sample is entered among the groove 4-1.Energized, the infrared laser of infrared light supply 5 emission through good transparent window 1 vertical irradiation of light transmission in the water that flows.The transmitted light beam that sees through water sample shines on the transmitted light detector 6 by No. two transparent windows 2 in opposite, scattered beam is then by shining on the light scattering detector 7 with perpendicular No. three transparent windows 3 of infrared light supply 5, transmitted light detector 6 converts optical signal transmissive and the proportional electric signal of transmitted intensity to, light scattering detector 7 converts scattered light signal and the proportional electric signal of scattered light intensity to, the output electric signal of transmitted light detector 6 and light scattering detector 7 converts digital signal to through analog to digital converter and is input to and carries out analyzing and processing in the microprocessor 10, and operation result sends external control devices to by communication interface 11.This device adopts the 8V-30V DC power supply, source current is 16mA (representative value), the infrared light supply 5 that uses adopts the infra-red laser diode of 935nm, the CMOS low-power consumption high sensitivity photoelectric detector TEKS6400 that light scattering detector, transmitted light detector adopt Vishay Intertechnology company to release, two analog to digital converters adopt the ADI AD9480 of company serial 8bit resolution product, microprocessor adopts 16 products of XAPRISC, communication interface adopts RS-232 interface, represent logical one, represent the logical signal of logical zero with 0V with+5V.Microprocessor is handled the scattered light intensity digital signal, extracts its pulsation composition effective value S
p, with its square value divided by average transmitted intensity digital signal T
aNatural logarithm reciprocal is to eliminate the influence of floc particle concentration to the ripple component size, ratio operation result α=S
p 2/ ln (32768/T
a).Suppose in the water that the floc particle particle diameter is all identical and for spherical, the random variation of floc particle number is followed Poisson distribution in the infrared light path, and number fluctuates in the upper and lower standard deviation scope of average, then S
p=K
1I
0VN
1/2/ λ
2, ln (32768/T
a)=K
27. a
2N I
0, ratio operation result α=S
p 2/ ln (k/T
a)=K
3I
0a
4/ λ
4In the formula: K
1, K
2, K
3Be constant; N is the floc particle number in the unit volume; V is the volume of each floc particle; λ is the wavelength of infrared light supply; I
0Light intensity for infrared light supply; A is the spherical radius (geometric radius) of floc particle.General infrared light supply light intensity and wavelength immobilize, thereby ratio operation result α value is just relevant with the geometric radius of floc particle in the water, can be with its final significant figure signal as flocculu shape in the reaction water, and its value is big more, represents flocculating effect good more.
Embodiment two: flocculu shape infrared light ratio pulsation detection method in the water, it is realized by following steps: one, by infrared light supply 5 the infrared laser line is passed and add flocculating agent also through the detected water sample after stirring; Two, use transmitted light detector 6 to receive the infrared laser line that passes detected water sample, receive the infrared laser line in direction with light scattering detector 7 simultaneously and shine the scattered light that produces behind the detected water sample perpendicular to the infrared laser line; Three, transmitted light detector 6 converts the light signal that receives and the proportional transmitted light electric signal of light intensity to, and light scattering detector 7 converts the light signal that receives and the proportional scattered light electric signal of light intensity to simultaneously; Four, the scattered light electric signal of the transmitted light electric signal of transmitted light detector 6 output and light scattering detector 7 outputs is input to microprocessor 10 after converting digital signal to through No. one analog to digital converter 8 and No. two analog to digital converters 9 respectively; Five, microprocessor 10 transmits from No. one analog to digital converter 8 and calculates average transmitted intensity digital signal value T the digital signal
a,, microprocessor is handled the digital signal that transmits from No. two analog to digital converters 9, extracts its pulsation composition effective value S
p, with pulsation composition effective value S
pSquare value divided by average transmitted intensity digital signal value T
aNatural logarithm reciprocal is to eliminate the influence of floc particle concentration to the ripple component size, i.e. α=S
p 2/ ln (32768/T
a); Ratio operation result α value is the final significant figure signal of flocculu shape in the reaction water, and its value is big more, represents flocculating effect good more.
Claims (1)
1. flocculu shape infrared light ratio pulsation detection method in the water is characterized in that what it was realized by following steps: one, by infrared light supply (5) the infrared laser line is passed and add flocculating agent also through the detected water sample after stirring; Two, use transmitted light detector (6) to receive the infrared laser line that passes detected water sample, receive the infrared laser line in direction with light scattering detector (7) simultaneously and shine the scattered light that produces behind the detected water sample perpendicular to the infrared laser line; Three, transmitted light detector (6) converts the light signal that receives and the proportional transmitted light electric signal of light intensity to, and light scattering detector (7) converts the light signal that receives and the proportional scattered light electric signal of light intensity to simultaneously; Four, the scattered light electric signal of the transmitted light electric signal of transmitted light detector (6) output and light scattering detector (7) output is input to microprocessor (10) after converting digital signal to through No. one analog to digital converter (8) and No. two analog to digital converters (9) respectively; Five, microprocessor (10) transmits from No. one analog to digital converter (8) and calculates average transmitted intensity digital signal value T the digital signal
a,, microprocessor (10) is handled the digital signal that transmits from No. two analog to digital converters (9), extracts its pulsation composition effective value S
p, obtain the final significant figure signal that ratio operation result α value is flocculu shape in the reaction water: α=S with following formula
p 2/ ln (32768/T
a).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122263A (en) * | 2013-04-26 | 2014-10-29 | 济南大学 | Imaging method for laser detection of floc dynamic state |
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| CN1300014C (en) * | 2005-07-13 | 2007-02-14 | 哈尔滨工业大学 | Method for on-line testing effect of polution removing by permanganate composite drug |
| CN102650588A (en) * | 2012-03-16 | 2012-08-29 | 京东方科技集团股份有限公司 | Method and device for monitoring processing capacity of solution as well as etching system |
| CN104122830B (en) * | 2013-04-26 | 2016-12-28 | 济南大学 | A kind of emulation mode of infrared dynamic synchronization monitoring flco |
| CN106885770A (en) * | 2016-03-04 | 2017-06-23 | 摩瑞尔电器（昆山）有限公司 | A kind of big data system and method based on laser detection solution |
| CN110031434A (en) * | 2019-04-08 | 2019-07-19 | 大族激光科技产业集团股份有限公司 | Laser light transmission rate test device and its test method |
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| EP0459846A2 (en) * | 1990-04-27 | 1991-12-04 | Ponselle Mesure Sarl | Probe for monitoring the turbidity of water |
| GB2355524A (en) * | 1999-10-18 | 2001-04-25 | Siemens Plc | Device for measuring colour and turbidity in a liquid sample |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0459846A2 (en) * | 1990-04-27 | 1991-12-04 | Ponselle Mesure Sarl | Probe for monitoring the turbidity of water |
| GB2355524A (en) * | 1999-10-18 | 2001-04-25 | Siemens Plc | Device for measuring colour and turbidity in a liquid sample |
Non-Patent Citations (1)
| Title |
|---|
| 新型在线光学絮凝检测仪的原理、设计与制造. 于水利，李邦宜，曹世杰，李虹，李圭白.传感器技术，第16卷第1期. 1997 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122263A (en) * | 2013-04-26 | 2014-10-29 | 济南大学 | Imaging method for laser detection of floc dynamic state |
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