CN104833820A - Flow velocity measurement system based on fluorescent tracing technique and method thereof - Google Patents
Flow velocity measurement system based on fluorescent tracing technique and method thereof Download PDFInfo
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- CN104833820A CN104833820A CN201510232617.0A CN201510232617A CN104833820A CN 104833820 A CN104833820 A CN 104833820A CN 201510232617 A CN201510232617 A CN 201510232617A CN 104833820 A CN104833820 A CN 104833820A
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- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 29
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract 10
- 238000012545 processing Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
本发明公开了一种基于荧光示踪技术的流速测量系统及方法，属于流速测量技术领域。本发明包括在沿流体流动方向距离为L的地方分别设置投放点和检测点；在投放点放置荧光剂投放装置，投放荧光剂；当荧光剂到达检测点时，在激发光源的照射下产生荧光信号，将荧光信号通过光敏二极管转换为电信号，并经过放大，再交由单片机处理；记录下荧光剂从投放点到检测点所用时间t；计算距离L与时间t的商值，即为所测流体的平均流速v，并将结果显示出来。本发明将荧光示踪技术引入到流速测量领域，开辟了流速测量的新思路。本发明所采用的荧光剂用量小，投放后可以很快被分解，基本上不会对生态环境产生影响。
The invention discloses a flow velocity measurement system and method based on fluorescent tracer technology, belonging to the technical field of flow velocity measurement. The invention includes respectively setting a delivery point and a detection point at a place whose distance is L along the fluid flow direction; a fluorescent agent delivery device is placed at the delivery point, and the fluorescent agent is injected; when the fluorescent agent reaches the detection point, fluorescence is generated under the irradiation of an excitation light source Signal, the fluorescent signal is converted into an electrical signal through a photosensitive diode, and then amplified, and then processed by a single-chip computer; the time t taken by the fluorescent agent from the injection point to the detection point is recorded; the quotient of the distance L and time t is calculated, which is the obtained Measure the average flow velocity v of the fluid and display the result. The invention introduces the fluorescent tracing technology into the field of flow velocity measurement, and opens up a new idea of flow velocity measurement. The fluorescent agent used in the present invention has a small dosage, can be decomposed quickly after being put in, and basically has no impact on the ecological environment.
Description
Technical field
The invention belongs to fluid-velocity survey technical field, more specifically, relate to a kind of flow velocity measuring system based on fluorescent tracer technique and method.
Background technology
Flow velocity can reflect that fluid has this feature of mobility the most intuitively.Fluid-velocity survey technical development so far, there is a lot of very proven technique, more advanced technology has Doppler laser velocimeter (being called for short LDV) and particle image velocimeter (being called for short PIV), and the general character of these two kinds of methods will throw in trace particle exactly in fluid.When the former principle is the trace particle when the flowing of LASER Light Source directive, the scattered light frequency that particle sends can change, and detects that the change of frequency just can measure the speed of particle by electrooptical device, is also the flow velocity of fluid; The principle of the latter is that optically multiexposure, multiple exposure trace particle, in not position in the same time, just can measure not velocity in the same time by change in displacement.Doppler laser velocimeter and particle image velocimeter can reach very high precision in fluid-velocity survey, but cannot extensively promote due to expensive equipment.More simply, a kind of method that electrolyte pulse method measures flow rate of water flow is disclosed in the method (application number 01131826.0) that patent of invention electrolyte pulse method measures flow rate of water flow and sediment charge, by adding electrolyte in water, several groups of probes are being arranged along the direction of water flow, when electrolyte ion flows through probe time, voltage can change, so just can obtain electrolyte from rendering to the time t be detected, because input source and each distance L organized between probe can survey, the flow velocity of electrolyte ion just can be obtained, i.e. flow rate of water flow by L/t.Electrolyte pulse method reduces cost greatly, but very harsh to the requirement of water quality, and any charged ion all can produce interference to measurement.
In recent years, fluorescent tracer technique is widely used in the fields such as leak detection, flaw detection, sewage detection, and main cause is that it has highly sensitive, that reliability is strong advantage.A kind of method of fluorescence measurement water gaging matter stabilizer concentration is disclosed in patent of invention on-line automatic monitoring instrument of circulation cooling water quality stabilizing agent (application number 200810071307.5), fluorescer is added in the recirculated cooling water containing water quality stabilizer, the transparent vessel filling sample water is irradiated with incident light source, by the intensity of photodiode as sensor senses fluorescence, obtain the concentration of solvent in recirculated water with this.But current fluorescent tracer technique is not also applied to fluid-velocity survey field, this also becomes a problem urgently to be resolved hurrily.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of flow velocity measuring system based on fluorescent tracer technique and method, its object is to enrich existing flow-speed measurement method, supplement a kind of measuring method of flow rate of water flow, have simple to operate, reliability is strong, highly sensitive advantage.
For achieving the above object, according to one aspect of the present invention, a kind of flow velocity measuring system based on fluorescent tracer technique is provided, comprises:
Fluorescer delivery device, excitation source, servicing unit narrow band pass filter, condenser lens, photodiode, signal processing module, wherein, described fluorescer delivery device is provided with solenoid valve, and shown signal processing module is provided with signal amplification circuit, single-chip microcomputer and LCDs; Described fluorescer delivery device and described photodiode are vertically arranged, are separately fixed at the place that fluid upstream and downstream distance is L; Described condenser lens is positioned at immediately below described photodiode, and described narrow band pass filter is positioned at immediately below described condenser lens; Described excitation source is positioned at downstream fluid, arranges at an angle with described photodiode, and the extended line of its light path and described photodiode meets at a bit, and the output terminal of described photodiode is connected with described signal processing module.
According to another aspect of the present invention, a kind of flow-speed measurement method based on fluorescent tracer technique is provided, comprises the following steps:
Step 1 the system as claimed in claim 1 powers on;
Step 2 applies a pulse signal, the of short duration unlatching of described solenoid valve, and the instantaneous input fluorescer of described fluorescer delivery device is rolled into a ball in fluid, and first time measures beginning, and meter is now moment t
0;
Whether the voltage signal that step 3 detects described photodiode two ends in the place of distance release position downstream L by described signal processing module suddenlys change, and is perform step 4, otherwise is left intact;
The mutation voltage signal that described step 3 obtains by step 4 amplifies through described signal processing module, and the moment of meter voltage jump is t
1, this flow velocity measured of calculating is
and in this result of calculation of liquid crystal display screen display of described signal processing module;
Step 5 repeating said steps 2 ~ 4, takes multiple measurements;
The result of calculation of step 6 pair repetitive measurement is averaged, as last measurement flow velocity v.
In general, the above technical scheme conceived by the present invention compared with prior art, has following beneficial effect:
Fluorescent tracer technique is incorporated into fluid-velocity survey field by the present invention, opens the new approaches of fluid-velocity survey.The extremely strong fluorescence signal of fluorescer can make a distinction with undesired signal easily, substantially increases the reliability of measurement; On the other hand, equipment and materials of the present invention is simple and easy to get, and the costs such as light source wherein, photodiode, fluorescer are all lower, solves the difficult problem that existing instrument price is expensive, not easily promote.Further, fluorescer consumption of the present invention is little, can be decomposed very soon after input, substantially can not have an impact to ecologic environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of the flow velocity measuring system that the present invention is based on fluorescent tracer technique;
Fig. 2 is the process flow diagram of the flow-speed measurement method that the present invention is based on fluorescent tracer technique;
Fig. 3 is the circuit diagram of signal amplification circuit in signal processing module of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Figure 1 shows that the structural representation of the flow velocity measuring system that the present invention is based on fluorescent tracer technique, comprise fluorescer delivery device 1, solenoid valve 2, excitation source 3, servicing unit narrow band pass filter 4, condenser lens 5, photodiode 6, signal processing module 7.Signal processing module 7 is provided with signal amplification circuit, single-chip microcomputer and LCDs.Fluorescer delivery device 1 and photodiode 6 are vertically arranged, are separately fixed at the place that fluid upstream and downstream distance is L.Condenser lens 5 is positioned at immediately below photodiode 6, and narrow band pass filter 4 is positioned at immediately below condenser lens 5.Excitation source 3 is positioned at downstream fluid, arranges at an angle with photodiode 6, and the extended line of its light path and photodiode 6 meets at a bit.The output terminal of photodiode 6 is connected with wire with signal processing module 7.In embodiments of the present invention, excitation source 3 is ultraviolet LED, and the fluorescer in fluorescer delivery device 1 is water base fluorescent tracer
Figure 2 shows that the process flow diagram of the flow-speed measurement method that the present invention is based on fluorescent tracer technique, specifically comprise the following steps:
Step 1 device powers on.Now fluorescer delivery device 1 is contained with enough fluorescers, and the solenoid valve 2 of fluorescer delivery device 1, photodiode 6, signal processing module 7 power on, and excitation source 3 is lit;
Step 2 applies a pulse signal, and solenoid valve 2 is opened momently, and fluorescer is instantaneous to be rendered in fluid, and first time measures beginning, and meter is now moment t
0;
Step 3 arranges check point in the place of distance release position downstream L, and whether the voltage signal at microprocessor detect photodiode 6 two ends of signal processing module 7 suddenlys change.Before fluorescer group does not also arrive check point, voltage signal can not suddenly change, and is left intact accordingly; After fluorescer group flows through distance L with current, arrive check point, under the irradiation of excitation source 3 light path, fluorescer group launches strong fluorescence signal, through the unwanted undesired signal of narrow band pass filter 4 filtering, then line focus lens 5 focus on the light-sensitive surface of photodiode 6.So, the sudden change of fluorescence signal is just converted into the sudden change of photodiode 6 both end voltage signal, is for further processing;
The weak voltage signals that step 3 obtains by step 4 amplifies through the amplifying circuit of signal processing module 7, and is t by the moment of the single-chip microcomputer meter voltage jump of signal processing module 7
1, this flow velocity measured of calculating is
wherein L represents the path along water (flow) direction between release position and check point, and in this result of liquid crystal display screen display of signal processing module 7;
Step 5 repeats step 2 ~ 4, takes multiple measurements;
The result of calculation of step 6 pair repetitive measurement is averaged, as last measurement flow velocity v.
Figure 3 shows that the circuit diagram of signal amplification circuit in signal processing module 7 of the present invention, photodiode is connected with the resistance R2 of a 2k, and applies voltage at its two ends.When not having light signal, photodiode ends, and resistance R1 two ends can't detect voltage; When photodiode detects light signal, now it is equivalent to a resistance, and resistance R1 can get a part of voltage in two ends.But because usual voltage signal is very faint, just can need detect through amplifying.At voltage signal through after the amplifying circuit that amplifier OP07 is formed, then voltage amplification 100 doubly exports, and delivers to single-chip microcomputer.At a voltage output end electric capacity 104 in parallel, by HF noise signal filtering, interference can be reduced.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018878A (en) * | 2016-05-10 | 2016-10-12 | 中国人民解放军国防科学技术大学 | Plasma velocity measurement method and system |
| CN106093465A (en) * | 2016-07-07 | 2016-11-09 | 贵州东方世纪科技股份有限公司 | A kind of method utilizing navigator test streamflow speed |
| CN112462088A (en) * | 2020-11-18 | 2021-03-09 | 中国农业大学 | Method for measuring flow velocity of slope surface water flow through salt-heat coupling |
| CN114167078A (en) * | 2021-11-25 | 2022-03-11 | 中关村科学城城市大脑股份有限公司 | Flow velocity detection apparatus, flow velocity calculation method, and storage medium |
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| CN106018878A (en) * | 2016-05-10 | 2016-10-12 | 中国人民解放军国防科学技术大学 | Plasma velocity measurement method and system |
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| CN112462088A (en) * | 2020-11-18 | 2021-03-09 | 中国农业大学 | Method for measuring flow velocity of slope surface water flow through salt-heat coupling |
| CN114167078A (en) * | 2021-11-25 | 2022-03-11 | 中关村科学城城市大脑股份有限公司 | Flow velocity detection apparatus, flow velocity calculation method, and storage medium |
| CN114167078B (en) * | 2021-11-25 | 2022-07-12 | 中关村科学城城市大脑股份有限公司 | Flow velocity detection apparatus, flow velocity calculation method, and storage medium |
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Application publication date: 20150812 |