CN105806422B - A kind of single fiber line quantity sensor probe and its detection method - Google Patents

A kind of single fiber line quantity sensor probe and its detection method Download PDF

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Publication number
CN105806422B
CN105806422B CN201610367245.7A CN201610367245A CN105806422B CN 105806422 B CN105806422 B CN 105806422B CN 201610367245 A CN201610367245 A CN 201610367245A CN 105806422 B CN105806422 B CN 105806422B
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piston
fluid
detection
hole
cap
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CN105806422A (en
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钟丽琼
胡浩
姜云
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Guizhou University
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Guizhou University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/38Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule

Abstract

The present invention provides a kind of single fiber line quantity sensor probe and its detection method, sensor probe includes piston cylinder and detection case, it is closed respectively by end cap at the both ends of piston cylinder, sliding is provided with piston in piston cylinder, spring and piston rod are respectively provided between piston and the end cap at both ends, through-hole is offered on the end cap at both ends, one end of piston rod is fixed on piston, other end sealing is slideably positioned in through-hole, and the end of the piston rod in one of through-hole is fixed with reflecting part, reflecting part correspondence is equipped with fiber laser arrays end, detection case passes through a fluid passage with the chamber of piston two sides respectively and is connected, fluid passage and gas source are respectively arranged at fluid in the opposite sides of detection case internal flow path.It is mostly used in a manner of traditional dynamometry by solving existing flow sensor probe, possesses the limitations such as measurement accuracy is not high, energy consumption is big, the problem that cannot be competent at well in many occasions.The invention belongs to field of flow detection.

Description

A kind of single fiber line quantity sensor probe and its detection method
Technical field
The present invention relates to a kind of flow sensor probes, belong to flow sensing monitoring technical field.
Background technique
During modern industrial production especially automated production, it is often required to that production is monitored and controlled with various sensors Parameters in the process make equipment work in normal condition or optimum state, and product are made to reach best quality.Sensor Also such as industrial production, space development, hydrospace detection, environmental protection, resource investigation, medical diagnosis, biological work are penetrated into already The extremely general field of journey, even historical relic's protection etc..The present invention is one of sensor --- the flow sensor of numerous classifications. With the development of sensor technology, diversified flow sensor is had already appeared at present, it is most common to have vane type, vortex street Formula, toll bar vortex, hot-wire etc..But the sensors such as vane type, eddy currents, toll bar vortex, hot-wire, principle Traditional dynamometry mode is mostly used, possesses the limitations such as measurement accuracy is not high, energy consumption is big, cannot win well in many occasions Appoint.
Summary of the invention
It is an object of the invention to: a kind of single fiber line quantity sensor probe and its detection method are provided, it is existing to solve There is flow sensor probe to mostly use traditional dynamometry mode, possesses the limitations such as measurement accuracy is not high, energy consumption is big, very much The problem that occasion cannot be competent at well.
The solution of the present invention is as follows: a kind of single fiber line quantity sensor probe, including piston cylinder and is set to piston cylinder The both ends of the detection case of side, piston cylinder are closed by end cap respectively, and sliding is provided with piston, the end of piston and both ends in piston cylinder Spring and piston rod are respectively provided between lid, one end of spring is fixed on piston, and the other end is fixed on end cap, the both ends Through-hole is offered on end cap, one end of piston rod is fixed on piston, and other end sealing is slideably positioned in through-hole, i.e. piston To be slidingly sealed structure between bar and through-hole, for example, being provided with sealing ring on the outside of piston rod, pass through sealing ring realization and through-hole Sealing between inner wall prevents fluid from flowing between reflecting part and fiber laser arrays end, and the piston rod in one of through-hole End be fixed with reflecting part, the other end of the through-hole is additionally provided with fiber laser arrays end, fiber laser arrays end and the piston rod it Between through-hole side wall on be also provided with the external venthole being connected of probe, the fiber optic bundle at fiber laser arrays end is by incident optical It is formed with the output optical fiber set armouring, the incident optical other end is docked with light source, to couple incident light, the outgoing of the output optical fiber End is connect with light-sensitive element, output light intensity signal, can determine whether reflecting part by the power of the output optical fiber received signal The variation of distance between fiber laser arrays end can be extrapolated further to calculate the sliding distance of piston into piston two The pressure difference of the fluid of side;
Have fluid inlet and fluid outlet to enable flow across the inside of detection case, detection case and piston cylinder on detection case The chamber of middle piston two sides passes through a fluid passage respectively and is connected, and further includes gas source, and the gas supply direction of gas source is directed toward two The middle position of fluid passage, and fluid passage and gas source are respectively arranged at fluid opposite the two of detection case internal flow path It then lives so set, the Fluid pressure for flowing into two side cavity of piston should be identical when the fluid in detection case does not circulate side Plug can be remained unchanged in equilbrium position, and after fluid flowing, the Fluid pressure for flowing into two side cavity of piston is different, then Piston can slide, and this pressure change will be reflected in the change in optical signal of fibre-optical probe detection, that is, pass through the sensing Device detects the information such as fluid flow.
The spring of influence in order to avoid spring to sensor, piston two sides is symmetrical arranged, and the spring of piston two sides Structure and specification are identical, and piston is initial position when being located at the centre position of both ends end cap, at this point, piston two sides Spring is in nature, i.e. spring tensionless winkler foundation and compressive deformation;
For the sensing effect for guaranteeing fibre-optical probe, more accurate, the center of end cap where two through-holes are provided with is detected Heart position, two through-holes, piston and two piston rods are coaxially disposed, and reflecting part is vertically arranged with fiber laser arrays end, reflective Component is reflective mirror or reflecting piece, piston seal is provided between piston and the inner wall of piston cylinder, to prevent piston two sides Fluid penetrates into mutually;
As preferred structure, the fiber laser arrays end is tightened by screw thread in through-hole, to guarantee fibre-optical probe What is positioned is secured and accurate, and end cap is rubber stopper, and structure is more simplified under the premise of guaranteeing structural reliability;
For the service life and using effect for guaranteeing sensor, the preferred hard alloy of the material of piston;
Enter sensor probe to prevent from flowing intracorporal impurity, is provided with strainer on the fluid passage.
Utilize the method for the sensor probe detection fluid flow, comprising:
If being flowed in detection case without detected fluid, the Fluid pressure in piston cylinder in two side cavity of piston be it is identical, Piston keeps initial position constant, and fiber laser arrays end detects that two chamber pressure differences are zero;If there is detected fluid flowing in detection case, Starting gas source blows to form air-flow, then detected fluid and air-flow interact in detection case, so that detected fluid is gentle The initial momentum of stream changes, and fluid shifts in detection case, thus into piston cylinder fluid-mixing in piston Two sides form pressure difference, and piston slides under the action of two fluid detection chamber pressure differences to low pressure side, and passes through signal processing It obtains pressure difference, resettles momentum pressure difference mathematical model, reckoning obtains fluid momentum;
The momentum pressure difference mathematical model is as follows: the relationship between analysis transmission amount and pressure difference, if the speed of air-flow is Vs, The speed of detected fluid is V, wherein VsThe air velocity emitted by gas source, be known quantity, piston both ends pressure difference with The momentum M of two fluidss/ M is related, and wherein M is detected fluid momentum, MsFor air-flow momentum, respectively withWith V2It is directly proportional.
M=kV2
K is constant;
That is:
Then:
Wherein, k1For known quantity, to can acquire the value of V after known Δ P, in test, we take VsEqual to 5m/ S takes k1=2, V change by 1m/s to 2m/s, and curve is as described in Figure 3.
The circulating direction of fluid is perpendicular in the jet direction and detection case of gas source.
Compared with prior art, the present invention major advantage is as follows: can by structure design, theoretical research and experimental analysis Know, which has lesser structure, higher accuracy and reliability, well adapting to property and interchangeability etc., this Sensor probe can be suitably used for numerous fluid flow detection occasions, and photoelectric sensing principle is applied to field of flow detection, output Signal output valve after photoelectric conversion and signal processing calculate will change at double, to improve detection sensitivity, have very Important practical application value plays great impetus to the design and popularization of novel flow rate sensor probe.
Meanwhile differential pressure pick-up probe uses piston cylinder operator as pressure detection device, has pressure in two side liquids When power difference, piston is translational motion, it is only necessary to fluid pressure differential can be calculated according to the translational movement of piston, for Fibre Optical Sensor It is required that lower, measure and calculate more simple, and piston structure is more stable, not vulnerable to external interference, is hardly damaged, uses the longevity It is more permanent to order, so that the reliability of sensor probe, adaptability and interchangeability have compared with much progress, is suitable for use as fluid stream The measurement of amount;The intensity compensation principle of sensor probe is more simple, and practicability is stronger.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the sensor probe configuration;
Fig. 2 is detection principle diagram;
Fig. 3 is the relationship of fluid momentum Yu piston both sides pressure difference.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below with reference to accompanying drawings Step ground detailed description,
Embodiment:
Referring to figs. 1 to Fig. 3, the present embodiment provides a kind of single fiber line quantity sensor probes, including piston cylinder 1 and setting Detection case 2 in 1 side of piston cylinder, the both ends of piston cylinder 1 are closed by end cap 3 respectively, and end cap 3 is rubber stopper, are slided in piston cylinder 1 Dynamic to be provided with piston 4, the material of piston 4 is hard alloy, is provided with piston seal between piston 4 and the inner wall of piston cylinder 1 41, spring 5 and piston rod 6 are respectively provided between piston 4 and the end cap 3 at both ends, one end of spring 5 is fixed on piston 4, the other end It is fixed on end cap 3, the spring 5 of 4 two sides of piston is symmetrical arranged, and the structure of the spring 5 of 4 two sides of piston and the complete phase of specification It together, is initial position when piston 4 is located at the centre position of both ends end cap 3, at this point, the spring 5 of 4 two sides of piston is in nature State, i.e. spring tensionless winkler foundation and compressive deformation offer through-hole 7 on the end cap 3 at the both ends, and one end of piston rod 6 is fixed In on piston 4, other end sealing is slideably positioned in through-hole 7, the center position of end cap 3 where two through-holes 7 are provided with, Two through-holes 7, piston 4 and two piston rods 6 are coaxially disposed, and the end of the piston rod 6 in one of through-hole 7 is fixed with instead Light component 8, reflecting part 8 are vertically arranged with fiber laser arrays end 9, reflecting part 8 be reflective mirror or reflecting piece, the through-hole 7 it is another One end is additionally provided with fiber laser arrays end 9, and the one end at fiber laser arrays end 9 is tightened by screw thread in through-hole 7, fiber laser arrays end It is also provided on the side wall of through-hole 7 between 9 and the piston rod 6 and the external venthole 71 being connected of probe, fiber laser arrays end 9 Fiber optic bundle armouring gathered by incident optical and the output optical fiber 91 form, the output optical fiber 91 and photoelectric conversion at fiber laser arrays end 9 Device is connected, and photoelectric converter is connected with signal processor, and light source is set to one end of optical fiber for generating fiber-optic signal, light source hair Optical signal out is coupled into optical fiber, and the other end of optical fiber is divided into detection fiber and reference optical fiber after Y type coupler, inspection Intelligent acess is surveyed to the fiber laser arrays end 9 in sensor probe 1, and the incident optical as fiber laser arrays end 9, reference optical fiber is then Individually with a photoelectric converter be connected, and the photoelectric converter be also connected with signal processor;
Have fluid inlet 21 and fluid outlet 22 to enable flow across the inside of detection case 2, detection case 2 on detection case 2 Pass through a fluid passage 23 respectively with the chamber of 4 two sides of piston in piston cylinder 1 to be connected, filter is provided on fluid passage 23 Net 25, further includes gas source 24, and the middle position of two fluid passages 23, and 23 He of fluid passage are directed toward in the gas supply direction of gas source 24 Gas source 24 is respectively arranged at fluid in the opposite sides of 2 internal flow path of detection case, the jet direction and detection case 2 of gas source 24 The circulating direction of interior fluid is perpendicular.
Utilize the method for the sensor probe detection fluid flow:
The optical signal that light source issues is coupled into optical fiber, then is divided into two-way by Y type coupler, all the way through detection light Fibre reaches fiber laser arrays end 9, is irradiated on reflecting part 8, reflected light after reflection enters reception optical fiber 91, by reception optical fiber 91, which are transferred to photoelectric converter, carries out photoelectric conversion, then inputs a signal into signal processor and carry out signal processing;Another way is through joining It examines optical fiber to be transmitted directly to photoelectric converter and carry out also entering into signal processor after photoelectric conversion carry out signal processing, at signal It manages device and ratio operation is carried out to this two paths of signals again, obtain pressure difference;
As shown in Fig. 2, coupling and interacting with detected fluid from the test fluid (i.e. air-flow) that gas source 24 enters, in quilt Under the action of fluid measured, test fluid flow fields are shifted to the right by being uniformly distributed.When test fluid flow fields are uniformly distributed (i.e. detected fluid does not flow), the fluid flow into sensor or so test chamber is identical, the Fluid pressure in the test chamber of left and right Equal, piston rest is motionless;And after testing fluid flow fields and shifting to the right (detected fluid flows to the right), into sensing The fluid flow of device right chamber increases, and the fluid flow into sensor left chamber reduces, so as to cause the production of sensor or so test chamber Raw pressure difference.Piston 4 left and right offset directly driven 6 end of piston rod reflecting part 8 movement, and make fiber optic bundle with instead Mating plate (reflecting part 8) distance changes, and the intensity of output optical signal is caused to change, and photoelectric converter turns optical signal Electric signal is turned to, which is input in computer after the processing links such as amplification, rectification and filtering, cooperates corresponding algorithm meter It calculates, it can be deduced that the fluid pressure differential of two detection positions.Momentum pressure difference mathematical model is resettled, reckoning obtains fluid momentum.

Claims (4)

1. a kind of single fiber line quantity sensor probe, it is characterised in that: including piston cylinder (1) and be set to piston cylinder (1) one The detection case (2) of side, the both ends of piston cylinder (1) are closed by end cap (3) respectively, and sliding is provided with piston (4) in piston cylinder (1), Spring (5) and piston rod (6) are respectively provided between piston (4) and the end cap (3) at both ends, piston (4) are fixed in one end of spring (5) On, the other end is fixed on end cap (3), is offered through-hole (7) on the end cap (3) at the both ends, and one end of piston rod (6) is solid Due on piston (4), other end sealing is slideably positioned in through-hole (7), and the piston rod (6) in one of through-hole (7) End is fixed with reflecting part (8), and the other end of the through-hole (7) is additionally provided with fiber laser arrays end (9), fiber laser arrays end (9) Fiber optic bundle is formed by incident optical and the output optical fiber (91) set armouring, logical between fiber laser arrays end (9) and the piston rod (6) It is also provided on the side wall in hole (7) and the external venthole (71) being connected of probe;
There is fluid inlet (21) and fluid outlet (22) to enable flow across the inside of detection case (2), detection on detection case (2) Case (2) passes through a fluid passage (23) with the chamber of piston (4) two sides in piston cylinder (1) respectively and is connected, and further includes gas source (24), the middle position of two fluid passages (23), and fluid passage (23) and gas source are directed toward in the gas supply direction of gas source (24) (24) fluid is respectively arranged in the opposite sides of detection case (2) internal flow path, the jet direction and detection of gas source (24) The circulating direction of case (2) interior fluid is perpendicular;
Fluid when flowing, can generate momentum pressure difference, the momentum pressure in detection case (2) in the two sides test chamber of piston (4) The mathematical model of difference are as follows: the relationship between analysis transmission amount and pressure difference, if the speed of air-flow is Vs, the speed of detected fluid is V, Wherein VsIt is the air velocity emitted by gas source (24), is known quantity, the momentum of piston both ends pressure difference and two fluids Ms/ M is related, and wherein M is detected fluid momentum, MsFor air-flow momentum, respectively withWith V2It is directly proportional;
M=kV2
K is constant;
That is:
Then:
Wherein, k1For known quantity, so that the value of V can be acquired after known Δ P.
2. a kind of single fiber line quantity sensor probe according to claim 1, it is characterised in that: the bullet of piston (4) two sides Spring (5) is symmetrical arranged, and the structure of the spring (5) of piston (4) two sides and specification are identical, and piston (4) is located at both ends end It is initial position when covering the centre position of (3), at this point, the spring (5) of piston (4) two sides is in nature.
3. a kind of single fiber line quantity sensor probe according to claim 1, it is characterised in that: two through-holes (7) are opened The center position of end cap (3) where being located at, two through-holes (7), piston (4) and two piston rods (6) are coaxially disposed, reflective Component (8) is vertically arranged with fiber laser arrays end (9), is provided with piston seal between piston (4) and the inner wall of piston cylinder (1) (41)。
4. a kind of single fiber line quantity sensor probe according to claim 1, it is characterised in that: the fiber laser arrays end (9) it is tightened in through-hole (7) by screw thread.
CN201610367245.7A 2016-05-30 2016-05-30 A kind of single fiber line quantity sensor probe and its detection method Active CN105806422B (en)

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CN108775938A (en) * 2018-05-31 2018-11-09 北汽福田汽车股份有限公司 Flow sensor, gas handling system and vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4411738A1 (en) * 1994-04-06 1995-10-12 Elster Produktion Gmbh Turbine operated counter for material fluid flow in pipes
CN104389581A (en) * 2014-09-17 2015-03-04 中国石油大学(北京) Underground fluid induction device and fluid flow velocity measuring system using same
CN105021343A (en) * 2015-07-10 2015-11-04 贵州大学 Single fiber bundle probe differential pressure sensor
CN105043649A (en) * 2015-07-10 2015-11-11 贵州大学 Probe structure of single fiber bundle differential pressure sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4411738A1 (en) * 1994-04-06 1995-10-12 Elster Produktion Gmbh Turbine operated counter for material fluid flow in pipes
CN104389581A (en) * 2014-09-17 2015-03-04 中国石油大学(北京) Underground fluid induction device and fluid flow velocity measuring system using same
CN105021343A (en) * 2015-07-10 2015-11-04 贵州大学 Single fiber bundle probe differential pressure sensor
CN105043649A (en) * 2015-07-10 2015-11-11 贵州大学 Probe structure of single fiber bundle differential pressure sensor

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