CN104198436A - Detection system and detection method for concentration of light-transparent liquid - Google Patents
Detection system and detection method for concentration of light-transparent liquid Download PDFInfo
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- CN104198436A CN104198436A CN201410472852.0A CN201410472852A CN104198436A CN 104198436 A CN104198436 A CN 104198436A CN 201410472852 A CN201410472852 A CN 201410472852A CN 104198436 A CN104198436 A CN 104198436A
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- reflective mirror
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Abstract
The invention discloses a detection system for the concentration of light-transparent liquid. The detection system is characterized in that detected light-transparent liquid is enclosed in a standing container; a second reflecting mirror is arranged on the inner wall of one side of the standing container; a first reflecting mirror and a third reflecting mirror are respectively arranged on the inner wall, opposite to the second reflecting mirror, of the other side of the standing container; laser beams emitted by a laser device outside the container are projected to the first reflecting mirror and then are sequentially refracted by the second reflecting mirror and the third reflecting mirror; the emitted light after refraction is used as detection light; a photoelectric detector receives a detection light spot position signal; the detection light spot position signal is processed to obtain the concentration of the detected light-transparent liquid. The detection system disclosed by the invention has the advantages of high detection precision, high speed, simple structure, easiness for operation and wider refractive index detection range, and can be used for quickly detecting small change of the liquid concentration in real time.
Description
Technical field
The present invention relates to a kind of light-transmissive fluid concentration detection system and detection method, belong to detection field.
Background technology
Concentration is to weigh a very important index of industrial product quality, is an important physical parameter of liquid substance.Therefore,, in the production of the industries such as chemical industry, medicine, food and in some scientific researches, often need accurate quantification to measure the concentration of predetermined substance in liquid.The method of traditional measurement strength of fluid mainly contains hydrometer method, chemical analysis, supercritical ultrasonics technology, optical means etc.Although hydrometer method precision is higher, adopts analytical balance to claim repeatedly, and can only detect the concentration of upper surface solution; Chemical analysis has higher accuracy of detection, but it in use spent many chemical reagent are very expensive, cost is high, and analytical cycle that need to be very long, can not meet the requirement that real-time online detects; Though supercritical ultrasonics technology precision is high, device therefor weight is large, it is mobile to be difficult for, and measured strength of fluid wants appropriate, can not be too high can not be too low; Although optical means is convenient, quick, cheap and pollution-free, be subject to the impacts such as optical activity, sensitivity, equipment or environment, cause degree of accuracy not high.These Technology Needs complexity and expensive experimental provisions, and can not detect in real time for working fluid concentration.Sample time-consumingly and loaded down with trivial details, hysteresis quality is large simultaneously, and the result out of true of analysis can not meet present industrial actual requirement.
In the patent " liquid concentration detection device and detection method " of publication number 101216422, a kind of device and detection method of tracer liquid concentration disclosed.It utilizes light in having the tight container of euphotic cover plate, to reflect and refraction, records refractive index and the concentration of unknown liquid, can reach the object of fast detecting liquid refractivity, but in this device, refraction of light path number of times is few, and d is little for spot displacement Δ, and sensitivity is not high.
In the patent " a kind of liquid concentration detection device " of publication number 102590098A, adopt photovalve to detect the refracted ray intensity of exit facet, cost is high, and this system complex is difficult for building.
Paper (the optical method salinity measurement technical research [J] of position-based Sensitive Apparatus. Acta Optica, 2003,23 (11): 1379-1383.), scholar obtains luminous point position relationship on salinity and light-sensitive detector by the method that adds a certain amount of high concentration salt solution to change tested salt salinity water in low concentration salt solution, make salt salinity water stable, but its process length consuming time, is unfavorable for that real-time online detects.
Paper (performance evaluation of liquid quality fraction Photodetection system [J]. sensor and micro-system, 2013,31 (11): 8-10.), scholar proposes light path to be optimized, and by multiple reflections, increase light path and can effectively overcome above defect, the spot displacement that Dan Qi unit's concentration change causes is less, and sensitivity can not meet the demands.
Summary of the invention
The present invention, for avoiding the existing weak point of above-mentioned prior art, provides a kind of light-transmissive fluid concentration detection system and detection method, to effectively improving the sensitivity of Photoelectric Detection clear solution concentration, and realizes device miniaturization.Known with reference to solution refractive index in the situation that, utilize native system can determine fast and accurately the concentration of clear solution and the refractive index of solution.
The technical solution adopted for the present invention to solve the technical problems is:
The design feature of light-transmissive fluid concentration detection system of the present invention is: a standing container is set, and tested light-transmissive fluid is enclosed in described standing container; In described container, be positioned on the inwall of container one side the second reflective mirror is set, on the inwall of the container opposite side relative with described the second reflective mirror, be respectively arranged with the first reflective mirror and the 3rd reflective mirror, the minute surface of described the first reflective mirror and the 3rd reflective mirror is parallel to each other and becomes an inclination angle with described the second reflective mirror; On described container side wall, the top that is in described the second reflective mirror is provided with printing opacity form, and the below that is in described the second reflective mirror arranges lower printing opacity form;
The laser beam being sent by the laser instrument that is arranged on external container is projected to described the first reflective mirror from described upper printing opacity form, the refract light of described the first reflective mirror after the refraction of the second reflective mirror and the 3rd reflective mirror, is penetrated and conduct detection light by lower printing opacity form successively;
Photodetector is set for receiving the light spot position signal of described detection light, through signal, processes and obtain tested light-transmissive fluid concentration.
The design feature of light-transmissive fluid concentration detection system of the present invention is also:
Described laser instrument is the good semiconductor laser of the linearity of λ=635nm.
Described photodetector is position sensitive detector PSD or one dimensional linear array Charge Coupled Device (CCD) CCD.
The feature of utilizing detection system of the present invention to carry out the method for light-transmissive fluid concentration is to carry out as follows:
Step a, in container, inject the benchmark light-transmissive fluid that known refractive index is n1, the laser beam that laser instrument sends is set and from upper form, enters the angle in container, make incident ray after the refraction through the first reflective mirror, the second reflective mirror and the 3rd reflective mirror successively, in lower printing opacity form, penetrate, and in photodetector, obtain benchmark hot spot positional information; This detected state of described laser instrument and photodetector of take be to be set detected state;
Step b, the benchmark light-transmissive fluid in container is replaced by standard salt solion, keeps described laser instrument and photodetector for setting detected state, in photodetector, obtain the facula position information of standard salt solion;
Step c, for the standard salt solion repeating step b of variable concentrations, the corresponding facula position information that obtains the standard salt solion of variable concentrations, and obtain thus the graph of a relation of facula position information in concentration and photodetector;
Steps d, for tested transparency liquid, by step b, obtain tested transparency liquid hot spot positional information on photodetector, by with the comparing of described graph of a relation, obtain the concentration value of tested transparency liquid.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, laser beam of the present invention multiple reflections in reflective mirror group, increases light path, amplifies spot displacement Δ d, effectively improves the detection sensitivity of clear solution, has dwindled the required height of detecting instrument, compact conformation.
2, the invention belongs to non-contact measurement, safer for the measurement of toxic liquid;
3, simple, the good stability of system architecture of the present invention, employing Position-Sensitive Detector PSD or one dimensional linear array Charge Coupled Device (CCD) CCD Information Monitoring can facilitate and realize exactly the real-time online detection of strength of fluid, and can extensively in teaching, be used in conjunction with.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is that light path of the present invention detects principle schematic.
Fig. 3 is result after multiple reflections.
Number in the figure: printing opacity form on 1 laser instrument, 2,3 containers, 4 first reflective mirrors, 5 second reflective mirrors, 6 the 3rd reflective mirrors, 7 times printing opacity forms, 8 photodetectors, 9 data collecting cards, 10 computing machines, 11 bottom rubber plugs, 12 tapholes, 13 outlet valves, 14 top rubber plugs, 15 solution inlet port, 16 admission valves.
Embodiment
Referring to Fig. 1, in the present embodiment, the version of light-transmissive fluid concentration detection system is: a standing container 3 is set, and the bottom of container 3, by bottom rubber plug 11 back covers, offers taphole 12 in bottom rubber plug 11, and outlet valve 13 is set on taphole 12, for discharge liquid; The top of container 3 is provided with top rubber plug 14, offers solution inlet port 15 on top rubber plug 14, is provided with admission valve 16 in solution inlet port 15, for injecting light-transmissive fluid to container 3.
Tested light-transmissive fluid is enclosed in standing container 3; In container 3, be positioned on the inwall of container one side and be provided with the second reflective mirror 5, on the inwall of the container opposite side relative with described the second reflective mirror 5, be respectively arranged with the first reflective mirror 4 and the 3rd reflective mirror 6, the minute surface of described the first reflective mirror 4 and the 3rd reflective mirror 6 be parallel to each other and with 5 one-tenth one inclination angles of described the second reflective mirror; On described container side wall, the top that is in described the second reflective mirror 5 is provided with printing opacity form 2, and the below that is in described the second reflective mirror 5 arranges lower printing opacity form 7;
The laser beam being sent by the laser instrument 1 that is arranged on external container is projected to described the first reflective mirror 4 from described upper printing opacity form 2, the refract light of described the first reflective mirror 4 after the refraction of the second reflective mirror 5 and the 3rd reflective mirror 6, is penetrated and conduct detection light by lower printing opacity form 7 successively;
Photodetector 8 is set for receiving the light spot position signal that detects light, through data collecting card 9, gathers, and machine 10 carries out the tested light-transmissive fluid concentration of signal processing acquisition as calculated.
In concrete enforcement, laser instrument 1 is the good semiconductor laser of the linearity of λ=635nm; Photodetector 8 is position sensitive detector PSD or one dimensional linear array Charge Coupled Device (CCD) CCD.
The method of carrying out light-transmissive fluid concentration with detection system in the present embodiment is to carry out as follows:
Step 1, in container, inject the benchmark light-transmissive fluid that known refractive index is n1, the laser beam that laser instrument 1 sends is set and from upper form 2, enters the angle in container, make incident ray after the refraction through the first reflective mirror 4, the second reflective mirror 5 and the 3rd reflective mirror 6 successively, in lower printing opacity form 7, penetrate, and in photodetector 8, obtain benchmark hot spot positional information; This detected state of described laser instrument and photodetector of take be to be set detected state;
Step 2, the benchmark light-transmissive fluid in container is replaced by standard salt solion, keeps described laser instrument and photodetector for setting detected state, in photodetector 8, obtain the facula position information of standard salt solion;
Step 3, for the standard salt solion repeating step 2 of variable concentrations, the corresponding facula position information that obtains the standard salt solion of variable concentrations, and obtain thus the graph of a relation of facula position information in concentration and photodetector 8;
Step 4, for tested transparency liquid, by step 2, obtain tested transparency liquid hot spot positional information on photodetector 8, by with the comparing of described graph of a relation, obtain the concentration value of tested transparency liquid.
It is as follows that Fig. 2 shows measuring principle of the present invention:
Based on the signal of reflective detectable concentration light path as shown in Figure 2, fill with and in the closed container of printing opacity or semi-transparent liquid, arrange two and be the reflective mirror at α angle with container inner wall, the distance being respectively between the first reflective mirror 4 and 6, two reflective mirrors of the 3rd reflective mirror is l; The light that laser instrument sends is with angle θ
1enter to inject solvent cell again with refraction angle θ
2directive the first reflective mirror 4, through the reflection of the first reflective mirror 4, light is with θ
3reflection angle is folded to the second reflective mirror 5, on the second reflective mirror 5 with θ
4reflection enters the 3rd reflective mirror 6, and through the reflection of the 3rd reflective mirror 6, light is with reflection angle θ
5be folded to glass, then with incidence angle θ
6see through after glass with refraction angle θ
7be irradiated to PSD surface.At the optical path adjusting initial stage, allow light vertically shine to PSD.According to light refraction law, the relation of incident angle and reflection angle can obtain following relation:
n
1sinθ
1＝n
2sinθ
2 (1)
θ
3＝θ
2+α (2)
θ
4＝θ
2+2α (3)
n
1sinθ
7＝n
2sinθ
6 (4)
As shown in Figure 3, establishing light is h at incidence point on glass to the vertical range on the first reflective mirror 4
1, and light incides point on the first reflective mirror 4 for the first time, to the distance of glass surface, be h
2, by that analogy, obtain h
3, h
4, it is L that folded light beam is surveyed target surface light path to PSD after the refraction of liquid-air interface, establishing light is w in the distance of incidence point on glass and eye point, according to trigonometric function, can obtain:
h
4＝h
3sin(90+α)sin(90-θ
4)/sin(90-θ
4-α) (6)
l＝h
2tanθ
2+h
2tan(θ
3+α) (7)
w＝h
2tanθ
2+h
2tan(θ
3+α)+h
4tanθ
4+h
4tan(θ
5+α) (10)
When in container, the refractive index of solution changes, folded light beam is deflection thereupon, and PSD is with the side-play amount of voltage form output beam.When solution concentration changes, the light path after variation as shown in phantom in FIG., refractive index n
2become n'
2, angle θ
2, θ
3, θ
4, θ
5, θ
6, θ
7be changed to respectively θ '
2, θ '
3, θ '
4, θ '
5, θ '
6, θ '
7, and light incide for the first time point on the first reflective mirror 4 to the vertical range of glass surface by h
2become h'
2, light becomes w' at the distance w of incidence point on glass and eye point.Utilize angle and h after changing
2also can obtain the similar result with w.The Δ d side-play amount obtaining on PSD and the refractive index difference of fluid to be measured have relation one to one, and acquisition liquid refractivity is n'
2time strength of fluid.The displacement d that final hot spot on PSD produces because of solution refraction index changing is:
Δd＝(w-w')cosθ
7+[L+(w-w')sinθ
7]tan(θ
7-θ′
7)
Above derivation is the result that primary event in solution is calculated for light, can learn, because solution variations in refractive index causes the defection signal of micro-beam, mainly by the factor of two aspects, one repeatedly changes in refraction effect and brings; Another is to make owing to increasing solvent cell height the part increasing.Theoretical analysis shows, increase the height of solvent cell to suitable numerical value, and when larger incident angle, PSD signal response is better.But be subject to the impact of equipment making itself and experiment itself, on the one hand, increase solvent cell height, can increase solution time swap, PSD actual response signal is had a great impact simultaneously; On the other hand, also can increase the shared space of instrument itself, make instrument be difficult for miniaturization.During experiment light path design, should increase light at solvent cell order of reflection as far as possible, can make the structure in instrument space compacter, and obtain good resolution.Continue to calculate result of calculation after reflective mirror secondary reflection and triple reflection for this reason.
Fig. 3 is the different incident angle of analog computation and the incidence angle θ that obtains respectively through the first reflective mirror 4 and the last reflection of the 3rd reflective mirror 6, secondary reflection, triple reflection
1graph of a relation with spot displacement Δ d.As seen from Figure 3, after multiple reflections, can increase substantially the sensitivity of detection system.
The version that the present embodiment provides is in left side, to be respectively arranged with the first reflective mirror and the 3rd reflective mirror, if continue to increase the number of reflective mirror in left side, can effectively increase spot displacement, improves the sensitivity of detection system.When reflective mirror number reaches some, can make the sensitivity of detection system reach the effect in ideal.
The present invention describes by specific implementation process, without departing from the present invention, can also carry out various conversion and be equal to replacement invention.Therefore, the present invention is not limited to disclosed specific implementation process, and should fall into the whole embodiments within the scope of the claims in the present invention.
Claims (4)
1. a light-transmissive fluid concentration detection system, is characterized in that: a standing container is set, and tested light-transmissive fluid is enclosed in described standing container; In described container, be positioned on the inwall of container one side the second reflective mirror (5) is set, on the inwall of the container opposite side relative with described the second reflective mirror (5), be respectively arranged with the first reflective mirror (4) and the 3rd reflective mirror (6), the minute surface of described the first reflective mirror (4) and the 3rd reflective mirror (6) is parallel to each other and becomes an inclination angle with described the second reflective mirror (5); On described container side wall, the top that is in described the second reflective mirror (5) is provided with printing opacity form (2), and the below that is in described the second reflective mirror (5) arranges lower printing opacity form (7);
The laser beam being sent by the laser instrument (1) that is arranged on external container is projected to described the first reflective mirror (4) from described upper printing opacity form (2), the refract light of described the first reflective mirror (4) after the refraction of the second reflective mirror (5) and the 3rd reflective mirror (6), is penetrated and conduct detection light by lower printing opacity form (7) successively;
Photodetector (8) is set for receiving the light spot position signal of described detection light, through signal, processes and obtain tested light-transmissive fluid concentration.
2. light-transmissive fluid concentration detection system according to claim 1, is characterized in that: described laser instrument (1) is the good semiconductor laser of the linearity of λ=635nm.
3. light-transmissive fluid concentration detection system according to claim 1, is characterized in that: described photodetector (8) is position sensitive detector PSD or one dimensional linear array Charge Coupled Device (CCD) CCD.
4. utilize detection system described in claim 1 to carry out the method for light-transmissive fluid concentration, it is characterized in that carrying out as follows:
Step a, in container, inject the benchmark light-transmissive fluid that known refractive index is n1, the laser beam that laser instrument (1) sends is set and from upper form (2), enters the angle in container, make incident ray after the refraction through the first reflective mirror (4), the second reflective mirror (5) and the 3rd reflective mirror (6) successively, in lower printing opacity form (7), penetrate, and in photodetector (8), obtain benchmark hot spot positional information; This detected state of described laser instrument and photodetector of take be to be set detected state;
Step b, the benchmark light-transmissive fluid in container is replaced by standard salt solion, keeps described laser instrument and photodetector for setting detected state, the facula position information of acquisition standard salt solion in photodetector (8);
Step c, for the standard salt solion repeating step b of variable concentrations, the corresponding facula position information that obtains the standard salt solion of variable concentrations, and obtain thus the graph of a relation of facula position information in concentration and photodetector (8);
Steps d, for tested transparency liquid, by step b, obtain tested transparency liquid in the upper hot spot positional information of photodetector (8), by with the comparing of described graph of a relation, obtain the concentration value of tested transparency liquid.
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| CN105021570A (en) * | 2015-07-15 | 2015-11-04 | 中山市三易测量仪器有限公司 | Liquid concentration detection device |
| CN105651702A (en) * | 2016-03-22 | 2016-06-08 | 派棱环保科技（苏州）有限公司 | Water quality detection method based on film-coated decomposition pool |
| CN108195799A (en) * | 2018-02-12 | 2018-06-22 | 中国科学院光电研究院 | A kind of penetration by liquid rate measuring device and method based on total reflection principle |
| CN108507979A (en) * | 2018-05-29 | 2018-09-07 | 莆田市烛火信息技术有限公司 | A kind of brine, syrup concentration assay method based on Intelligent water cup for kitchen use |
| CN108507978A (en) * | 2018-05-29 | 2018-09-07 | 莆田市烛火信息技术有限公司 | A kind of household self-control beverage concentration measuring apparatus |
| CN110864998A (en) * | 2019-11-28 | 2020-03-06 | 文武 | Method for testing salt content of crude salt |
| CN111337455A (en) * | 2020-04-17 | 2020-06-26 | 湖南文理学院 | Concentration detection system for electroplating solution |
| TWI777503B (en) * | 2021-04-19 | 2022-09-11 | 林怡男 | Detection device for fluid |
| CN116990260A (en) * | 2023-09-27 | 2023-11-03 | 长春电子科技学院 | Alcohol concentration measuring method |
| CN117269080A (en) * | 2023-09-20 | 2023-12-22 | 秦皇岛卓安科技有限公司 | Organic matter detects laser sensor |
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| CN105021570B (en) * | 2015-07-15 | 2017-12-19 | 中山市三易测量仪器有限公司 | A kind of liquid concentration detection device |
| CN105021570A (en) * | 2015-07-15 | 2015-11-04 | 中山市三易测量仪器有限公司 | Liquid concentration detection device |
| CN105651702A (en) * | 2016-03-22 | 2016-06-08 | 派棱环保科技（苏州）有限公司 | Water quality detection method based on film-coated decomposition pool |
| CN108195799A (en) * | 2018-02-12 | 2018-06-22 | 中国科学院光电研究院 | A kind of penetration by liquid rate measuring device and method based on total reflection principle |
| CN108507979B (en) * | 2018-05-29 | 2020-11-24 | 义乌兰思体育用品有限公司 | Method for measuring concentration of saline water and sugar water based on intelligent water cup for kitchen |
| CN108507979A (en) * | 2018-05-29 | 2018-09-07 | 莆田市烛火信息技术有限公司 | A kind of brine, syrup concentration assay method based on Intelligent water cup for kitchen use |
| CN108507978A (en) * | 2018-05-29 | 2018-09-07 | 莆田市烛火信息技术有限公司 | A kind of household self-control beverage concentration measuring apparatus |
| CN110864998A (en) * | 2019-11-28 | 2020-03-06 | 文武 | Method for testing salt content of crude salt |
| CN111337455A (en) * | 2020-04-17 | 2020-06-26 | 湖南文理学院 | Concentration detection system for electroplating solution |
| CN111337455B (en) * | 2020-04-17 | 2022-09-23 | 湖南文理学院 | Concentration detection system for electroplating solution |
| TWI777503B (en) * | 2021-04-19 | 2022-09-11 | 林怡男 | Detection device for fluid |
| CN117269080A (en) * | 2023-09-20 | 2023-12-22 | 秦皇岛卓安科技有限公司 | Organic matter detects laser sensor |
| CN117269080B (en) * | 2023-09-20 | 2024-04-05 | 秦皇岛卓安科技有限公司 | Organic matter detects laser sensor |
| CN116990260A (en) * | 2023-09-27 | 2023-11-03 | 长春电子科技学院 | Alcohol concentration measuring method |
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