method and system for online simultaneous detection of low turbidity and high turbidity
阅读说明：本技术 一种在线式同时检测低浊和高浊的方法与系统 (method and system for online simultaneous detection of low turbidity and high turbidity ) 是由 孙琳 刘瑞杰 肖才斌 顾毅康 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种在线式同时检测低浊和高浊的方法与系统,包含检测池单元、光学系统单元、软件计算处理数据单元。光学单元包含两个测试通道,一个测试通道用来进行散射测试,一个测试通道用来进行透射测试,两个测试通道包含一个发光元件,两个感光元件,光学系统单元内发光元件与散射感光元件在电路板上以非直线角度进行安装,透射感光元件安装在发光元件的直线对面位置,分别用来进行散射和透射测试；当光学单元对水样进行测试时,会同时对水样进行散射测试和透射测试；设置散射信号阈值,光强度阈值,多级散射电流,多级透射电流,散射、透射电流切换对水样浊度进行测试。本发明可以优化我国水体环境浊度监测的实际需求。(The invention discloses an method and a system for online simultaneous detection of low turbidity and high turbidity, which comprises a detection cell unit, an optical system unit and a software calculation processing data unit, wherein the optical unit comprises two test channels, test channels are used for performing scattering test, test channels are used for performing transmission test, the two test channels comprise light-emitting elements and two photosensitive elements, the light-emitting elements and the scattering photosensitive elements in the optical system unit are arranged on a circuit board at non-linear angles, the transmission photosensitive elements are arranged at positions opposite to the straight lines of the light-emitting elements and are respectively used for performing scattering test and transmission test, when the optical unit tests a water sample, the optical unit simultaneously performs scattering test and transmission test on the water sample, and sets scattering signal threshold values, light intensity threshold values, multi-stage scattering current, multi-stage transmission current, scattering and transmission current switching to test the turbidity of the water sample.)
1, kinds of on-line simultaneous detection of low turbidity and high turbidityThe system is characterized by comprising a detection cell unit, an optical system unit and a software calculation processing data unit, wherein the optical unit comprises two test channels, test channels are used for performing scattering tests, test channels are used for performing transmission tests, the two test channels comprise light-emitting elements and two photosensitive elements, the light-emitting elements and the scattering photosensitive elements in the optical system unit are arranged on a circuit board at non-linear angles, the transmission photosensitive elements are arranged at positions opposite to the light-emitting elements in a linear mode and are used for performing scattering and transmission tests respectively, when the optical unit tests a water sample, the optical unit performs scattering tests and transmission tests on the water sample simultaneously, and a scattering signal threshold value m is set1And when the light intensity q is transmitted, the software system reads scattering and transmission signals tested by the optical unit, and the turbidity of the water sample is tested by respectively switching the scattering current and the transmission current.
2. The system of claim 1, wherein the optical unit housing is a hollow cylinder, the optical system structure is mounted inside, the light emitting element and the transmissive photosensitive element are located on the same line , and the scattering photosensitive element corresponds to the light emitting element and the transmissive photosensitive element at a non-linear angle.
3. The system for online simultaneous detection of low turbidity and high turbidity of claim 1, wherein: the scattering current is in two stages, and the transmission current is also in two stages.
4, method for online simultaneous detection of low turbidity and high turbidity, characterized in that the test is carried out using the system of any as claimed in claims 1, 2, 3:
setting a scatter signal threshold m1Transmitted light intensityq，Ki,biFor linear fit coefficients, the specific test steps are as follows:
step 1, testing a scattering signal of a water sample by using scattering current , and if the scattering signal is less than m1Substituting Y with the scattering current 1＝K1X1+b1Computing，X1From S under the scattered current Solution signal/Sdi signalTo give Sdi signalFor built-in scattered signals leaving the factory, SSolution signalThe scattering signal, Y, measured under the condition of scattering current 1If the concentration is turbidity concentration, otherwise, skipping to the step 2;
step 2, starting a scattering current self-regulation function to adjust the scattering signal of the water sample, wherein the scattering signal is less than or equal to m1Then new second scattering current is obtained and substituted into Y3＝K3X3+b3Calculating the scattering signal of DI under the second scattering current, wherein the driving current and the luminous intensity of the luminous element are in direct proportion, and X3For self-regulated scattered current two, Y3DI scatters Signal S 'under a scattercurrent of two'di signal(ii) a Simultaneously bring into relation Y1＝K1X1+b1Calculating the turbidity, wherein X1Is a scattering current of Ding S'Solution signal/S'di signal，S'di signalIs Y3＝K3X3+b3Calculated scatter Signal, S'Solution signalScattering signals measured under the condition of scattering current II; otherwise, jumping to the step 3;
step 3, adopting the transmission current to measure the transmission signal, if the transmission signal is larger than the transmission signalqDuring the process, the transmitted light intensity of the water sample is tested by using the transmission current III, and the absorbance X calculated by using the transmission current III2Carry into relation Y2＝K2X2+b2Calculating turbidity, X2From transmission current at three-log (T)Solution signal/Tdi signal) Result in, Tdi signalThe signal is a transmission signal parameter which is built in the factorySolution signalIs a transmission signal parameter, Y, measured under the three conditions of the current transmission current2Is turbidity concentration; otherwise, jumping to the step 4;
step 4, starting a transmission current self-regulation function to regulate the transmission light intensity of the water sample, and substituting the new transmission current four into Y if the transmission light intensity is greater than q to obtain a new transmission current four4＝K4X4+b4Calculate the perspectiveTransmitted light intensity T 'of DI under emission current four'di signal，X4Value of transmission current four, Y4Is T'di signal，T'Solution signalThe transmission signal parameter is measured under the current transmission current four condition, and the driving current of the light-emitting element is in direct proportion to the luminous intensity; can pass through-log (T'Solution signal/T'di signal) Obtaining the absorbance of the water sample under the transmission current of four, substituting into the relational expression Y2＝K2X2+b2Calculating turbidity; if the transmitted light intensity is less than q, the over-range alarm is given.
Technical Field
The invention relates to the field of detection, in particular to methods and systems for online simultaneous detection of low turbidity and high turbidity.
Background
The turbidity is not only the most important physical appearance index for representing water quality, but also means the content of various toxic and harmful substances in water, so that the accurate measurement of the turbidity in water is important.
Water is taken as a life source and directly relates to human health condition and industrial production quality, but water quality monitoring is not easy, water quality indexes are very many in the actual monitoring process, turbidity is which is an important index for measuring water quality condition, a water factory draws water from a place with less pollution in a long distance, although water quality is improved, water production cost is increased, water in water source places has large turbidity difference along with different seasons (tidal rivers) and gas phases, in order to enable the introduced water source water to meet national requirements, water inlet quality must be strictly detected, a tap water company directly discharges untreated large amount of filter tank backwashing wastewater and sedimentation tank sludge water into rivers, channel siltation is caused, negative influence of degree on water environment is caused, sewage must be treated and then discharged, and in both cases, a large amount of manpower and material resources are required to be invested to strictly detect water quality turbidity.
The turbidity measurement methods used in general include spectrophotometry, visual turbidimetry, and turbidimetry. The turbidity of the water sample is controlled by a visual method, and the error is large. At present, the measurement of turbidity is based on an optical method, and the measurement is complex, and the turbidity is not only related to suspended matters, but also related to the components of impurities in water, the particle size and the chromaticity of the water. The principle of the transmission light type turbidimeter is simple, the design of the instrument is also simple, a larger turbidity range can be obtained by adopting transmission type measurement, but the accuracy is easily influenced by the color of a water sample body, and the transmission light type turbidimeter is suitable for measuring a high-turbidity water sample; the scattering turbidity meter is suitable for water samples with lower turbidity, and the scattering light intensity is in direct proportion to the turbidity of the water samples. Therefore, the prior turbidity measurement has the phenomena of poor signal stability, low effectiveness and accuracy, small measuring range, large error and low stability, so that the measurement becomes very difficult, and the practical application can not meet the engineering requirement.
Disclosure of Invention
1. Objects of the invention
The invention provides online methods and systems for simultaneously monitoring low turbidity and high turbidity, which integrate the advantages of scattering and transmission, utilize hardware structure design and characteristics in combination with software method, can realize full-range measurement of 1-10000NTU only by infrared lamps, have simple structure, are connected with a client controller and output by 4-20MA current signals, are simple to use, have high sensitivity and accuracy, and automatically switch test channels according to actual water samples.
2. The technical scheme adopted by the invention
The invention discloses an system for online simultaneous detection of low turbidity and high turbidity, which comprises a detection pool unit, an optical system unit and a software calculation processing data unit, wherein the optical unit comprises two test channels, test channels are used for performing scattering test, test channels are used for performing transmission test, the two test channels comprise light-emitting elements and two photosensitive elements, the light-emitting elements and the scattering photosensitive elements are arranged on a circuit board at non-linear angles, the transmission photosensitive elements are arranged at positions opposite to the linear positions of the light-emitting elements and are used for performing scattering and transmission tests respectively, when the optical unit tests a water sample, the optical unit simultaneously performs scattering test and transmission test on the water sample, and a scattering signal threshold value m is set1And a light intensity threshold q, reading scattering and transmission signals tested by the optical unit by a software system, and testing the turbidity of the water sample by respectively switching scattering current and transmission current.
Further , the optical unit housing is a hollow cylinder, the optical system structure is installed inside, the light emitting element and the transmission photosensitive element are on the same diagonal line , and the scattering photosensitive element corresponds to the light emitting element and the transmission photosensitive element at a non-linear angle.
Further , the scattering current is two-step, and the transmission current is two-step.
The invention discloses online methods for simultaneously detecting low turbidity and high turbidity, which are used for testing according to the following steps:
setting a scatter signal threshold m1Transmitted light intensityq，Ki,biFor linear fit coefficients, the specific test steps are as follows:
step 4, starting a transmission current self-regulation function to regulate the transmission light intensity of the water sample, and substituting the new transmission current four into Y if the transmission light intensity is greater than q to obtain a new transmission current four4＝K4X4+b4Calculating transmitted light intensity T 'of DI under transmission current four'di signalX4Value of transmission current four, Y4Is T'di signal，T'Solution signalIs when
The transmission signal parameter measured under the four conditions of the front transmission current, the driving current of the light-emitting element and the luminous intensity are in direct proportion; can pass through-log (T'Solution signal/T'di signal) Obtaining the absorbance of the water sample under the transmission current of four, substituting into the relational expression Y2＝K2X2+b2Calculating turbidity; if the transmitted light intensity is less than q, the over-range alarm is given.
3. Advantageous effects adopted by the present invention
(1) Based on the technology of a scattering method and a transmission method, the invention carries out two-channel multi-current scattering transmission measurement through an unique light source, judges and selects a proper measurement channel and a proper test method, finds out the relation between an optical element and scattering and transmission signals by utilizing the characteristics of an optical structure and hardware, develops methods and systems capable of simultaneously detecting low turbidity and high turbidity, realizes the automatic switching measurement of the turbidity concentration range from 1NTU to 10000NTU on the device, has stable performance and high sensitivity, adopts multi-current scattering signal calculation at the low end, adopts multi-current transmission signal calculation at the high end, and can control the accuracy within +/-5 percent.
(2) The invention selects the large range through transmission and selects the precision through scattering, so the invention adopts multi-stage transmission current and scattering current to realize the testing precision.
Drawings
FIG. 1 is a cross-sectional view of the optical unit of the device;
FIG. 2 is a cross-sectional view of the optical unit of the device;
in fig. 3, y is 0.997x +0.68, R2A linear relation graph of a true value and an actual value which are 0.999;
in fig. 4, y is 0.985x-1.543, R2A linear relation graph of a true value and an actual value of 0.998;
in fig. 5, y is 1.044x-37.44, R2A linear relation graph of a true value and an actual value of 0.998;
in fig. 6, y is 0.965x +270.3, R2Linear relationship between true value and measured value of 0.999.
Detailed Description
The technical solutions in the examples of the present invention will be described clearly and completely with reference to the drawings in the examples of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than the whole embodiments.
An example of the invention is further described in detail below with reference to the drawings.
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