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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Abstract
The invention discloses a flow velocity measurement system based on fluorescent tracing technique and a method thereof. The flow velocity measurement system belongs to the technical field of flow velocity measurement. The method of the invention comprises the steps of respectively arranging a release point and a detecting point at positions which are separated from each other for L in the fluid flow direction; arranging a fluorescent agent releasing device at the release point and releasing the fluorescent agent; when the fluorescent agent arrives at the detecting point, generating a fluorescent signal under irradiation of an excitation light source, converting the fluorescent signal to an electric signal through a photosensitive diode, amplifying the electric signal and processing the amplified electric signal by a single-chip microcomputer; recording a time length t from releasing at the releasing point to arriving at the detecting point by the fluorescent agent; calculating a quotient between the length L and the time length t, namely the average flow velocity v of the measured fluid is obtained, and furthermore displaying the result. According to the flow velocity measurement system, the fluorescent tracing technique is introduced into the flow velocity measurement field and a new concept for flow velocity measurement is developed. The amount of the fluorescent agent used in the flow velocity measurement system is small, and the fluorescent agent can be quickly decomposed after releasing, and therefore no effect is generated for the ecological environment substantially.
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)
1. based on a flow velocity measuring system for fluorescent tracer technique, it is characterized in that, comprising:
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.
2. as claimed in claim 1 based on the flow velocity measuring system of fluorescent tracer technique, it is characterized in that, after the fluorescer group that described fluorescer delivery device is thrown in flows through distance L with current, under the irradiation of described excitation source light path, fluorescer group launches strong fluorescence signal, through the unwanted undesired signal of described narrow band pass filter filtering, then focus on through described condenser lens on the light-sensitive surface of described photodiode.
3. as claimed in claim 1 or 2 based on the flow velocity measuring system of fluorescent tracer technique, it is characterized in that, described photodiode both end voltage signal amplifies through the amplifying circuit of described signal processing module, this flow velocity measured is calculated again by the single-chip microcomputer of described signal processing module, and in this result of calculation of liquid crystal display screen display of described signal processing module.
4. based on a flow-speed measurement method for fluorescent tracer technique, it is characterized in that, comprising:
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.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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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Cited By (5)
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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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