CN102621047A - Sediment content reflective measuring method and sediment content reflective measuring device - Google Patents
Sediment content reflective measuring method and sediment content reflective measuring device Download PDFInfo
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- CN102621047A CN102621047A CN2012101013527A CN201210101352A CN102621047A CN 102621047 A CN102621047 A CN 102621047A CN 2012101013527 A CN2012101013527 A CN 2012101013527A CN 201210101352 A CN201210101352 A CN 201210101352A CN 102621047 A CN102621047 A CN 102621047A
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Abstract
The invention relates to a sediment content reflective measuring method and a sediment content reflective measuring device. The sediment content reflective measuring method includes the following steps of firstly, setting a sediment content measuring device comprising a near-infrared sensor, a single-chip microcomputer, a power source driving circuit, an amplifying circuit and a data acquirer; secondly, calibrating sediment content of sediment carrying flow to be measured and building a calibration model before measuring; and thirdly, disposing the near-infrared sensor into the sediment carrying flow to be measured, repeating the above steps to acquire optical signals reflected by sediment and voltage signal intensity value of reflecting light, and calculating the sediment content of the sediment carrying flow to be measured according to the calibration model, wherein the near-infrared sensor comprises light source, a photoelectric detector and a glass plate. The sediment content reflective measuring method and the sediment content reflective measuring device can be widely applied to areas with serious water losses and soil erosion and particularly applicable to measuring sediment carrying flow high in sediment content.
Description
Technical field
The present invention relates to a kind of sand-carrying capacity measuring method and measurement mechanism, particularly about a kind of reflective sand-carrying capacity measuring method and measurement mechanism that is applicable to high sediment concentration.
Background technology
China is one of more serious country of soil erosion; Distinct issues are that the river silt content is higher; The Huanghe valley for example; According to " Chinese river load communique " data, important hydrometric station, 1950～2005 years the Yellow River mainstream downstream surveys for many years that mean sediment runoff is about 900,000,000 tons, and annual mean sediment concentration is 25kg/m
3About, local section can reach every cubic metre of hundreds of even thousands of kilogram.The measurement of silt content is the important content in the automatic monitoring system of soil erosion, how fast, accurately, the continuous coverage silt content is significant for soil erosion study, diversion irrigation, harbour shipping and hydraulic engineering security of operation etc.At present, the method for measuring the river silt content has the direct method of measurement and the indirect method of measurement, and the direct method of measurement generally adopts oven drying method, and the influence of oven drying method human factor is bigger, not only wastes time and energy, and can not monitor the dynamic changing process of sediment concentration well; The indirect method of measurement has vibratory drilling method, supercritical ultrasonics technology, laser method, remote sensing method, photoelectric method and infra-red method etc.Above-mentioned measuring method is used to measure the lower situation of silt silt content basically, and measuring accuracy is higher, but measurement range is limited, and particularly silt content surpasses 50kg/m
3The time, can't satisfy measurement requirement.
With the immediate technology of the present invention be infrared sand-measuring meter, it is to adopt near infrared ray retroreflection method or transmission method to measure silt content.Generally, the silt content of infrared sand-measuring meter institute energy measurement is also at 50kg/m
3Below, receive the influence of silt composition etc. bigger, be not suitable for the measurement of high sediment concentration.Because China's severe water and soil erosion is domatic all higher with the river course silt content, so limited the application of infrared sand-measuring meter.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide a kind of reflective sand-carrying capacity measuring method and the measurement mechanism that can measure high sediment concentration in the silt carrying flow accurately, fast.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of reflective sand-carrying capacity measuring method; May further comprise the steps: 1) be provided with one include near infrared sensor, single-chip microcomputer, light source driving circuit, amplifying circuit and data acquisition unit the sediment concentration measuring device, said near infrared sensor includes light source, photodetector and glass plate; 2) before the measurement; Silt content to silt carrying flow to be measured is carried out rating test; Set up peg model; Detailed process is: 1. near infrared sensor is placed in the current of known silt content, single-chip microcomputer sends near infrared light through light source driving circuit control light source, and near infrared light sees through glass plate and shines in the silt carrying flow; 2. photodetector receives the light signal through the silt reflection; And will receive that conversion of signals becomes electric signal after amplifying circuit sends to single-chip microcomputer; After single-chip microcomputer carries out the A/D conversion, output in the data acquisition unit, data acquisition unit is according to the acquisition time storage of setting and show catoptrical voltage signal intensity level; 3. obtain peg model Y=Ax+B according to the relation between catoptrical voltage signal intensity level and the known silt content concentration value, in the formula, A and B are respectively regression coefficient and regression constant; When 3) measuring, near infrared sensor is placed in the silt carrying flow to be measured, repeats the light signal of above-mentioned steps collection, and obtain catoptrical voltage signal intensity level through the silt reflection, according to said peg model, the counter silt content of obtaining silt carrying flow to be measured.
The process of setting up of peg model said step 2) is: 1) near infrared sensor is fixedly installed in the stirred vessel; And in stirred vessel, add a certain amount of pure water; Silt in the silt carrying flow to be measured of known quality is put into stirred vessel, obtain containing the silt carrying flow of silt to be measured; 2) silt in the stirred vessel is stirred, send near infrared light through light source, data acquisition unit collects the intensity level of reflected light signal through photodetector; 3) after measurement is accomplished, continue in stirred vessel, to add the silt of known quality, repeating step 2); 4) according to the intensity level Y of the one group of reflected light signal that measures and the silt content value x of correspondence; Through match; Find the solution and draw regression coefficient A and regression constant B; With A and B substitution, both found the solution the relation that obtains between catoptrical voltage signal intensity level and the known silt content concentration value and obtained peg model: Y=Ax+B.
Realize a kind of reflective sediment concentration measuring device of said measuring method, it is characterized in that: it includes single-chip microcomputer, light source driving circuit, amplifying circuit and data acquisition unit; Said near infrared sensor is bowl-shape; The bottom centre of said near infrared sensor is provided with a photodetector; Medial surface all around around said photodetector is provided with more than one light source; A relative side with said photodetector is provided with a glass plate, makes whole said near infrared sensor form a hollow closed structure; The said light source driving circuit of said Single-chip Controlling connects said light source driving, and it sends near infrared light; Said near infrared light is received by said photodetector after the silt reflection; Send to said single-chip microcomputer through said amplifying circuit, said single-chip microcomputer carries out sending to said data acquisition unit after A/D changes with the signal that receives and stores demonstration.
Angle between said light source and the said photodetection is 45 degree.
Said optical source wavelength adopts more than one among 1800nm and the 1940nm.
Said light source adopts based on GaInAsSb type photodiode.
Said photodetector adopts the photodiode of the PD24 type of GaInAsSb.
The present invention is owing to take above technical scheme; It has the following advantages: 1, the present invention is owing to be provided with a near infrared sensor in silt carrying flow; And be provided with an above light source, a photodetector and a glass plate above that; Therefore when silt carrying flow was measured, photodetector can directly receive the light signal that reflects through silt in the silt carrying flow, and obtained the silt content value quickly and accurately according to known peg model.2, the present invention compares with retroreflection method or transmission method in the prior art owing to adopt the near-infrared reflection mode that the silt content in the silt carrying flow is measured, and the present invention is specially adapted to the silt carrying flow of high sediment concentration is measured.3, optical source wavelength of the present invention can adopt a kind of among 1800nm and the 1940nm, and perhaps two kinds of wavelength combinations are used, and therefore can the measurement range be selected easily according to uses needs.4, photodetector of the present invention adopts the photodiode based on the PD24 type of GaInAsSb, because photoelectric diode has the response time fast, so the present invention can accomplish the measurement of silt content fast and accurately; Because the photodetector that adopts receives only the near infrared light of light source wave band, therefore do not receive the influence of available light simultaneously.5, light source of the present invention adopts the photodiode based on the GaInAsSb type, because little based on the photodiode volume of GaInAsSb type, power consumption is few, and the life-span is long, and response speed is fast, so the having good stability of the measurement mechanism of silt content of the present invention.The present invention can be widely used in the area of severe water and soil erosion and use, and is particularly useful in the measuring process of silt current of high sediment concentration.
Description of drawings
Fig. 1 (a) is the structural representation of measurement mechanism of the present invention;
Fig. 1 (b) is that synoptic diagram is looked on the left side of near infrared sensor among Fig. 1 (a);
Fig. 2 is a test unit synoptic diagram of the present invention;
Fig. 3 is the graph of a relation between the reflected light signal intensity level that reads of silt content of the present invention and data acquisition unit, and horizontal ordinate is represented silt content, and unit is kg/m
3, ordinate is represented the reflected light signal intensity level; Fig. 3 (a) adopts the measurement result of 1800nm light source to the silt content of Yellow River mud, coefficient of determination R
2=0.90; Fig. 3 (b) adopts the measurement result of 1940nm light source to the silt content of Yellow River mud, coefficient of determination R
2=0.96; Fig. 3 (c) adopts the measurement result of 1800nm light source to the silt content of Weihe River silt, coefficient of determination R
2=0.99; Fig. 3 (d) adopts the measurement result of 1940nm light source to the silt content of Weihe River silt, coefficient of determination R
2=0.96; Fig. 3 (e) adopts the measurement result of 1800nm light source to the silt content of sky and water silt, coefficient of determination R
2=0.96; Fig. 3 (f) adopts the measurement result of 1940nm light source to the silt content of sky and water silt, coefficient of determination R
2=0.97;
Fig. 4 is that actual sediment concentration of the present invention compares synoptic diagram with the result who adopts peg model to calculate sediment concentration; The result of calculation of " ◆ " expression Yellow River mud silt content; The result of calculation of the silt content of " ■ " expression Weihe River silt; The result of calculation of the silt content of " ▲ " expression sky and water silt, horizontal ordinate is represented actual silt content, unit is kg/m
3, ordinate is represented the calculating silt content that calculates through peg model, unit is kg/m
3Fig. 4 (a) adopts the actual sediment concentration of 1800nm light source and the comparison diagram as a result of the silt content that adopts peg model to calculate, and three kinds of silt actual values and Model Calculation value are all near 1: 1 straight line, and fit equation coefficient of determination R
2All greater than 0.91; Fig. 4 (b) adopts the actual sediment concentration of 1940nm light source and the comparison diagram as a result of the silt content that adopts peg model to calculate, and three kinds of silt actual values and Model Calculation value are all near 1: 1 straight line, and fit equation coefficient of determination R
2All greater than 0.95.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
Silt carrying flow is the solid-liquid two-phase flow body that silt and water are formed, and when rayed was in silt carrying flow, a part of light was through the silt carrying flow transmission, and a part is absorbed by current and silt, and a part is by current and silt reflection.Under the less situation of silt carrying flow silt content, most of light is through the silt carrying flow transmission, and having only seldom, a part is reflected by current and silt.Along with silt content constantly increases; Silt strengthens reflection of light; There is more light to be reflected by silt; Therefore as long as can measure intensity, and set up the peg model of light signal strength and different sediment concentrations, just can measure the silt content of different silt carrying flows through this peg model through the light signal of silt reflection.
Shown in Fig. 1 (a), sediment concentration measuring device of the present invention includes a near infrared sensor 1, a single-chip microcomputer 2, a light source driving circuit 3, an amplifying circuit 4 and a data acquisition unit 5; Wherein, Near infrared sensor 1 is bowl-shape design; The bottom centre of near infrared sensor 1 (the bowl end) is provided with a photodetector 11; (on the bowl-shape side) is provided with one or more light source 12 on the side around the photodetector 11, with photodetector 11 relative sides (the rim of a bowl) glass plate 13 is set, and makes whole near infrared sensor 1 form a hollow closed structure.Single-chip microcomputer 2 control light source driving circuits 3 connect light source 12 driving light sources and send near infrared light; Near infrared light is sent to single-chip microcomputer 2 by photodetector 11 receptions through amplifying circuit 4 after the silt reflection, single-chip microcomputer 2 carries out sending to data acquisition unit 5 after A/D changes with the signal that receives and stores demonstration.
Shown in Fig. 1 (b); In the foregoing description, in order to strengthen the stability of light signal in the silt carrying flow, the inwall side of near infrared sensor 1 can be set to six; Center, the bottom of near infrared sensor 1 (the bowl end) is provided with a photodetector 11; Each face of six at interval is provided with 12, six light sources 12 of a light source respectively can be divided into two groups, and wherein one group of light source 121 wavelength that can adopt is 1800nm; The wavelength that other one group of light source 122 adopts is 1940nm; Each light source in two groups of light sources is arranged alternately respectively, and the angle between the Different Light that is adjacent of each light source can be set to 60 degree, and the angle between each light source 12 and the photodetection 11 is set to 45 and spends.The actual quantity of light source 12 can confirm as required that if adopt a light source, the wavelength of light source 12 can adopt 1800nm or 1940nm, if adopt two or more light sources, the wavelength of light source 12 can adopt the combination of 1800nm or 1940nm.The mode of operation of all light sources 12 is selected the mode of operation of constant current source, that is: the electric current of input light source and light intensity that light source sends are proportional.
Among above-mentioned each embodiment, light source 12 adopts based on GaInAsSb type photodiode, and the performance parameter of light source 12 is: diameter 5mm, maximum impulse mode current 1A, maximum continuous mode current 220mA, the diameter 3mm of hot spot.
Among above-mentioned each embodiment, the photodiode that photodetector 11 adopts based on the PD24 type of GaInAsSb, its performance parameter is: sensitizing range diameter 0.3mm, cutoff wavelength 2.4 μ m, dark current 0.7-3 μ A, peak wavelength 2.0-2.2 μ m; The photodetector of above-mentioned performance parameter has very strong response characteristic to the light of 1800nm and 1940nm wave band.
Among above-mentioned each embodiment, glass plate 13 can adopt poly (methyl methacrylate) plate.
Among above-mentioned each embodiment, light source driving circuit 3 needs to guarantee that the input current of light sources is constant, therefore can select for use pulse mode luminous, and light source 12 is not damaged, and input current and output intensity improve a lot.
Among above-mentioned each embodiment, because the catoptrical signal that photodetector 11 receives is fainter, amplifying circuit 4 of the present invention can be selected second amplifying circuit 4 for use; Second amplifying circuit 4 can be made up of two single-stage amplifying circuits, and input signal gets into the prime input end, the input end of level after being amplified into; Through level amplification later, the intensity of reflected light signal is enhanced again, has advantages such as high speed, low noise; Because the second amplifying circuit that adopts is a custom circuit, therefore repeat no more.
Shown in Fig. 1 (a), the method that adopts above-mentioned sediment concentration measuring device that the silt content of a certain silt carrying flow is measured may further comprise the steps:
1) before the measurement, silt to be measured is carried out rating test, set up peg model, detailed process is:
1. near infrared sensor 1 is placed in the silt carrying flow of known silt content, single-chip microcomputer 2 sends near infrared light through light source driving circuit 3 all light sources 12 of control, and near infrared light sees through glass plate 13 and shines in the silt carrying flow;
2. photodetector 11 receives the light signal that reflects through silt; And will receive that conversion of signals becomes electric signal after amplifying circuit 4 sends to single-chip microcomputer 2; After single-chip microcomputer 2 carries out A/D conversion, output in the data acquisition unit in 5, data acquisition unit 5 is according to the acquisition time storage of setting and show catoptrical voltage signal intensity level.
3. obtain peg model Y=Ax+B according to the relation between catoptrical voltage signal intensity level and the known silt content value, in the formula, A and B are respectively regression coefficient and regression constant.
When 2) measuring, near infrared sensor 1 is placed in the silt carrying flow to be measured, repeats the light signal of above-mentioned steps collection, and obtain catoptrical voltage signal intensity level through the silt reflection, according to above-mentioned peg model, the counter silt content of obtaining silt carrying flow.
As shown in Figure 3, in the foregoing description, above-mentioned steps 1) calibration process in is: the silt of choosing silt carrying flow to be measured; Adopt balance to take by weighing the silt weight of sieving and drying; With near infrared sensor 1 be fixedly installed on a volume be the test of 1500mL with in the stirred vessel 6, and in stirred vessel 6, add the 1000mL pure water, the silt of known quality is put in the stirred vessel 6; Be mixed with certain density silt carrying flow; This concentration is the design silt content of the silt content of silt carrying flow, and actual silt content is the quality of silt in the unit silt carrying flow, and the computing formula of actual silt content C is:
In the formula, C
dBe the design silt content, unit is kg/m
3ρ
sBe sand grain density, ρ
sBe 2.65 * 10
3Kg/m
3
Silt in the stirred vessel 6 fully stirs, and sends near infrared light through light source 12, and photodetector 12 sends to amplifying circuit 4, single-chip microcomputer 2 and data acquisition unit 5 successively with the signal that receives; Data acquisition unit 5 shows the intensity level of reflected light signal; After measuring completion, continue in stirred vessel 6, to add continuously the silt of known quality, repeat above-mentioned measuring process; In order to reduce stochastic error; The sediment concentration of same concentration reads three secondary data, averages, the intensity level Y of the one group of reflected light signal that obtains after the measurement and corresponding silt content value x; According to analysis to measurement result; Linear between the voltage signal of the silt content of the silt carrying flow of variable concentrations and near infrared sensor 1 output, promptly intensity of reflected light strengthens along with the increase of silt carrying flow silt content, can find the solution through match and draw regression coefficient A and regression constant B; With in A and the B substitution peg model, both found the solution the relation that obtains between catoptrical voltage signal intensity level and the known silt content concentration value and obtained peg model at last:
Y＝Ax+B (2)
Can be in actual measurement through the anti-silt content x that obtains silt carrying flow of output voltage signal intensity level Y of this relational expression according near infrared sensor.
Below through concrete embodiment; Further check the response characteristic of 1 pair of different silt of near infrared sensor of the present invention; The near infrared sensor of specific embodiment of the present invention adopts two groups of light sources of 1800nm wave band and 1940nm wave band to make an experiment for three kinds of silts choosing (taking from the Yellow River S1, Weihe River S2 and sky and water S3 respectively), and detailed process is following:
Respectively the Yellow River S1, Weihe River S2 and sky and water S3 being adopted precision is that the balance of 0.01g takes by weighing the silt that sieves and dry; Near infrared sensor 1 is fixed in the stirred vessel 6, and the 1000mL pure water is added to stirred vessel 6, and in stirred vessel 6, put into a kind of a certain amount of silt and fully stir; Single-chip microcomputer 2 reads measurement data through light source driving circuit 3 when the different light sources of two groups of wavelength are alternately stablized through data acquisition unit 5 respectively under the irradiation; After the data of a certain concentration (silt content value) accomplished in record, and in stirred vessel 6, add a certain amount of silt again, repeat said process several times; The silt content of variable concentrations to preparation is measured; In order to reduce stochastic error, the sediment concentration of same concentration reads three secondary data, averages; Obtain the design silt content of silt carrying flow of the variable concentrations of three kinds of different silts, and the actual silt content of three kinds of different silts asking according to formula (1).
Shown in Fig. 3 (a)～Fig. 3 (f), under the different condition according to formula (2) (the equal R of the coefficient of determination
2All greater than 0.9), be under the light source irradiation of 1800nm and 1940nm at wavelength, the relational expression of the output voltage signal intensity level Y of near infrared sensor 1 and the silt content x of silt carrying flow is:
1) wavelength is that the relational expression of the output voltage signal intensity level Y of near infrared sensor 1 and the silt content x of silt carrying flow is respectively under three kinds of different silt carrying flow conditions of light source irradiation of 1800nm:
Yellow River mud: Y=0.1061x+12.267
Weihe River silt: Y=0.0989x+15.325
Sky and water silt: Y=0.1421x+18.472
2) wavelength is that the relational expression of the output voltage signal intensity level Y of near infrared sensor 1 and the silt content x of silt carrying flow is respectively under three kinds of different silt carrying flow conditions of light source irradiation of 1940nm:
Yellow River mud: Y=0.1345x+12.650
Weihe River silt: Y=0.1005x+15.338
Sky and water silt: Y=0.1450x+18.569
The regression coefficient statistics of three kinds of different silt carrying flows under the light sources with different wavelengths irradiation is as shown in table 1,
Table 1
Can find out that from the statistics of table 1 same type silt Response Table reveals identical trend; Coefficient A is close, therefore having good stability of near infrared sensor 1 can be described, with a kind of light source different silts is had different response characteristics; Coefficient A fluctuation is bigger; Therefore explain that near infrared sensor receives the influence of silt kind bigger, will carry out rating test to different silt carrying flows to be measured before therefore measuring, draw peg model.
Shown in Fig. 4 (a)～Fig. 4 (b), actual silt content and peg model result of calculation are compared, the result shows, adopts peg model result of calculation and actual silt content correlativity good, as shown in table 2, coefficient of determination R
2All greater than 0.91, regression coefficient D all approaches 1, promptly can use the peg model calculated value to replace actual value.Error between employing peg model calculating sediment concentration and actual sediment concentration is all less than 5%.Therefore, near-infrared reflection sensor 1 of the present invention can be measured high sediment concentration situation, draws through test, and maximum survey sensor value can reach 300kg/m
3, the survey sensor precision can reach 10kg/m
3
Table 2
Above-mentioned each embodiment only is used to explain the present invention; Wherein the structure of the step of implementation method, measurement mechanism and connected mode all can change to some extent; Every equivalents of on the basis of technical scheme of the present invention, carrying out and improvement all should not got rid of outside protection scope of the present invention.
Claims (10)
1. reflective sand-carrying capacity measuring method may further comprise the steps:
1) be provided with one include near infrared sensor, single-chip microcomputer, light source driving circuit, amplifying circuit and data acquisition unit the sediment concentration measuring device, said near infrared sensor includes light source, photodetector and glass plate;
2) before the measurement, the silt content of silt carrying flow to be measured is carried out rating test, set up peg model, detailed process is:
1. near infrared sensor is placed in the current of known silt content, single-chip microcomputer sends near infrared light through light source driving circuit control light source, and near infrared light sees through glass plate and shines in the silt carrying flow;
2. photodetector receives the light signal through the silt reflection; And will receive that conversion of signals becomes electric signal after amplifying circuit sends to single-chip microcomputer; After single-chip microcomputer carries out the A/D conversion, output in the data acquisition unit, data acquisition unit is according to the acquisition time storage of setting and show catoptrical voltage signal intensity level;
3. obtain peg model Y=Ax+B according to the relation between catoptrical voltage signal intensity level and the known silt content concentration value, in the formula, A and B are respectively regression coefficient and regression constant;
When 3) measuring, near infrared sensor is placed in the silt carrying flow to be measured, repeats the light signal of above-mentioned steps collection, and obtain catoptrical voltage signal intensity level through the silt reflection, according to said peg model, the counter silt content of obtaining silt carrying flow to be measured.
2. a kind of reflective sand-carrying capacity measuring method as claimed in claim 1 is characterized in that: the process of setting up of peg model said step 2) is:
1) near infrared sensor is fixedly installed in the stirred vessel, and in stirred vessel, adds a certain amount of pure water, the silt in the silt carrying flow to be measured of known quality is put into stirred vessel, obtain containing the silt carrying flow of silt to be measured;
2) silt in the stirred vessel is stirred, send near infrared light through light source, data acquisition unit collects the intensity level of reflected light signal through photodetector;
3) after measurement is accomplished, continue in stirred vessel, to add the silt of known quality, repeating step 2);
4) according to the intensity level Y of the one group of reflected light signal that measures and the silt content value x of correspondence; Through match; Find the solution and draw regression coefficient A and regression constant B; With A and B substitution, both found the solution the relation that obtains between catoptrical voltage signal intensity level and the known silt content concentration value and obtained peg model:
Y＝Ax+B。
3. realize a kind of reflective sediment concentration measuring device of measuring method according to claim 1 or claim 2, it is characterized in that: it includes single-chip microcomputer, light source driving circuit, amplifying circuit and data acquisition unit; Said near infrared sensor is bowl-shape; The bottom centre of said near infrared sensor is provided with a photodetector; Medial surface all around around said photodetector is provided with more than one light source; A relative side with said photodetector is provided with a glass plate, makes whole said near infrared sensor form a hollow closed structure; The said light source driving circuit of said Single-chip Controlling connects said light source driving, and it sends near infrared light; Said near infrared light is received by said photodetector after the silt reflection; Send to said single-chip microcomputer through said amplifying circuit, said single-chip microcomputer carries out sending to said data acquisition unit after A/D changes with the signal that receives and stores demonstration.
4. a kind of reflective sediment concentration measuring device as claimed in claim 3 is characterized in that: the angle between said light source and the said photodetection is 45 degree.
5. like claim 3 or 4 described a kind of reflective sediment concentration measuring devices, it is characterized in that: said optical source wavelength adopts more than one among 1800nm and the 1940nm.
6. like claim 3 or 4 described a kind of reflective sediment concentration measuring devices, it is characterized in that: said light source adopts based on GaInAsSb type photodiode.
7. a kind of reflective sediment concentration measuring device as claimed in claim 5 is characterized in that: said light source adopts based on GaInAsSb type photodiode.
8. like claim 3 or 4 or 7 described a kind of reflective sediment concentration measuring devices, it is characterized in that: said photodetector adopts the photodiode of the PD24 type of GaInAsSb.
9. a kind of reflective sediment concentration measuring device as claimed in claim 5 is characterized in that: said photodetector adopts the photodiode of the PD24 type of GaInAsSb.
10. a kind of reflective sediment concentration measuring device as claimed in claim 6 is characterized in that: said photodetector adopts the photodiode of the PD24 type of GaInAsSb.
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| CN109883906A (en) * | 2019-02-21 | 2019-06-14 | 浙江大学 | A kind of nano metal two-phase fluid stability measurement method |
| CN109883912A (en) * | 2019-02-28 | 2019-06-14 | 河海大学 | A kind of water body sediment concentration measuring device and method |
| CN110108659A (en) * | 2019-05-28 | 2019-08-09 | 杭州电子科技大学 | One kind being based on near-infrared reflection formula soil humidity measuring device and its detection method |
| CN110398460A (en) * | 2019-07-30 | 2019-11-01 | 邱景 | A kind of husky device and method of hydrology survey |
| CN110398460B (en) * | 2019-07-30 | 2021-09-21 | 邱景 | Hydrological sand measurement device and method |
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