CN106052781B - A kind of single-piston optic flow sensor probe and its detection method - Google Patents
A kind of single-piston optic flow sensor probe and its detection method Download PDFInfo
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- CN106052781B CN106052781B CN201610367241.9A CN201610367241A CN106052781B CN 106052781 B CN106052781 B CN 106052781B CN 201610367241 A CN201610367241 A CN 201610367241A CN 106052781 B CN106052781 B CN 106052781B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention provides a kind of single-piston optic flow sensor probe and its detection method, sensor probe includes piston cylinder and the detection case for being set to piston cylinder side, 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 end cap, detection through-hole is offered on end cap, piston rod one end is fixed on piston, the other end is slideably positioned in detection through-hole, and the end of piston rod is fixed with reflecting part, the other end of detection through-hole is additionally provided 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
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-piston optic flow sensor probe and its detection method are provided, to solve
Existing flow sensor mostly uses traditional dynamometry mode, possesses the limitations such as measurement accuracy is not high, energy consumption is big, in many fields
Close the problem that cannot be competent at well.
The solution of the present invention is as follows: a kind of single-piston optic flow sensor probe, including piston cylinder and is set to piston
The both ends of the detection case of cylinder side, piston cylinder are closed by end cap respectively, and sliding is provided with piston in piston cylinder, piston and both ends
Spring and piston rod are respectively provided between end cap, one end of spring is fixed on piston, and the other end is fixed on end cap, the both ends
End cap on offer detection through-hole, one end of piston rod is fixed on piston, the other end be slideably positioned in detection through-hole in,
And the end for the piston rod being slideably positioned in detection through-hole is fixed with reflecting part, the other end for detecting through-hole is additionally provided with light
The fiber optic bundle of fine test side, fiber laser arrays end is formed by incident optical and the output optical fiber set armouring, the incident optical other end with
Light source docking, to couple incident light, the exit end of the output optical fiber is connect with light-sensitive element, output light intensity signal, by going out
The power for penetrating optical fiber received signal can determine whether the distance between reflecting part and fiber laser arrays end, to calculate the cunning of piston
Dynamic distance, can further extrapolate the pressure difference of the fluid into piston two sides；
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 when piston is located at the centre position of both ends end cap, the spring of piston two sides is in nature
State, i.e. spring tensionless winkler foundation and compressive deformation；
For the sensing effect for guaranteeing fibre-optical probe, guarantee the distance between both ends fiber laser arrays end and reflecting part balance,
The center position of end cap where two detection through-holes are provided with, two detection through-holes, piston and two piston rods are coaxial
Setting, reflecting part are vertically arranged with fiber laser arrays end, and reflecting part is reflective mirror or reflecting piece, the inner wall of piston and piston cylinder
Between to be slidingly sealed formula structure, to prevent the fluid of piston two sides from penetrating into mutually, also to slide between piston rod and detection through-hole
Movable sealing structure is realized and is detected by sealing ring and is between through-hole wall close for example, being provided with sealing ring on the outside of piston rod
Envelope prevents fluid from flowing between reflecting part and fiber laser arrays end；
As preferred structure, the one end at the fiber laser arrays end is tightened by screw thread in detecting in through-hole, to protect
The secured and accurate of fibre-optical probe positioning is demonstrate,proved, end cap is rubber stopper, and structure is more simplified under the premise of guaranteeing structural reliability；
For the sealing effect for guaranteeing piston, prevent fluid from flowing into spring place chamber, piston and piston cylinder through piston ridge
Inner wall between be provided with piston seal；
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.
A kind of single-piston fiber optic flow detection method, comprising:
Optical Fibre Differential-Pressure Seasor probe and the detection case with fluid distribution channel；
Optical Fibre Differential-Pressure Seasor probe includes the piston cylinder of tubular, and there are two by being slideably positioned in piston for tool in piston cylinder
The fluid detection chamber that piston in cylinder separates, two fluid detection chambers are connected with detection case respectively；
Detection case passes through two fluid passages with two fluid detection chambers respectively and is connected, and is also correspondingly arranged at detection case
Towards the gas source of the middle position jet of two fluid passages, and fluid passage and gas source are respectively arranged at the fluid in detection case
The opposite sides of distribution channel, if detection case in without detected fluid flow, two intracavitary pressure of fluid detection be it is identical,
Optical Fibre Differential-Pressure Seasor probe detects that two chamber pressure differences are zero；If there is detected fluid flowing in detection case, starting gas source is blown
Air-flow is formed, then detected fluid and air-flow interact in detection case, so that the initial momentum of detected fluid and air-flow
It changes, fluid-mixing shifts in detection case, so that the fluid-mixing into piston cylinder is formed in the two sides of piston
Pressure difference, piston slides under the action of two fluid detection chamber pressure differences to low pressure side, and is visited by Optical Fibre Differential-Pressure Seasor
Head detection pressure difference, establishes momentum pressure difference mathematical model, and 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.
Fluid circulating direction is perpendicular in the blowing 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-piston optic flow sensor probe, including piston cylinder 1 and set
It is placed in the detection case 2 of 1 side of piston cylinder, the both ends of piston cylinder 1 are closed by end cap 3 respectively, and sliding is provided with piston in piston cylinder 1
4, it is provided with piston seal 41 between piston 4 and the inner wall of piston cylinder 1, is respectively provided with spring between piston 4 and the end cap 3 at both ends
5 and piston rod 6, one end of spring 5 be fixed on piston 4, the other end is fixed on end cap 3, and the springs 5 of 4 two sides of piston is symmetrical
Setting, and the structure of the spring 5 of 4 two sides of piston and specification are identical, piston 4 is located at the centre position of both ends end cap 3
When, the spring 5 of 4 two sides of piston is in nature, i.e. spring tensionless winkler foundation and compressive deformation, and the end cap 3 at the both ends is just
Center position offers detection through-hole 7, and one end of piston rod 6 is fixed on piston 4, and it is logical that the other end is slideably positioned in detection
In hole 7, the outside of piston rod 6 is provided with sealing ring, realizes and detect the sealing between 7 inner wall of through-hole by sealing ring, and sliding
The end of the dynamic piston rod 6 being set in detection through-hole 7 is fixed with reflecting part 8, two detection through-holes 7, piston 4 and two work
Stopper rod 6 is coaxially disposed, and reflecting part 8 is vertically arranged with fiber laser arrays end 9, and reflecting part 8 is reflective mirror or reflecting piece, detection
The other end of through-hole 7 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 detection through-hole 7
Interior, the fiber optic bundle at fiber laser arrays end 9 is gathered armouring by incident optical 91 and the output optical fiber 92 and is formed, 91 other end of incident optical with
Light source docking, to couple incident light, the exit end of the output optical fiber 92 is connect with light-sensitive element, and output light intensity signal passes through
The power of 92 received signal of the output optical fiber can determine whether the distance between reflecting part 8 and fiber laser arrays end 9, to calculate work
The sliding distance of plug 4, can further extrapolate the pressure difference of the fluid into 4 two sides of piston；
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 10 respectively with the chamber of 4 two sides of piston in piston cylinder 1 to be connected, filter is provided on fluid passage 10
Net 12, further includes gas source 11, and the middle position of two fluid passages 10, and 10 He of fluid passage are directed toward in the gas supply direction of gas source 11
Gas source 11 is respectively arranged at fluid in the opposite sides of 2 internal flow path of detection case, so set, when the stream in detection case 2
When body does not circulate, the Fluid pressure for flowing into 4 liang of side cavities of piston should be identical, then piston 4 can be remained unchanged in equilbrium position,
And after fluid flowing, the Fluid pressure for flowing into 4 liang of side cavities of piston is different, then piston 4 can slide, this pressure
Variation will be reflected in the change in optical signal of fibre-optical probe detection, i.e., detect the information such as fluid flow by the sensor.
A kind of method of single-piston fiber parametric amplification flow:
There are two the fluid detection chambers separated by the piston 4 being slideably positioned in piston cylinder 1 for tool in piston cylinder 1, if inspection
It is flowed in measuring tank 2 without detected fluid, then two intracavitary pressure of fluid detection are identical, Optical Fibre Differential-Pressure Seasor probe detection
It is zero to two chamber pressure differences；If there is detected fluid flowing in detection case 2, the starting air blowing of gas source 11 forms air-flow, then detected fluid
It interacts in detection case 2 with air-flow, so that the initial momentum of detected fluid and air-flow changes, fluid-mixing exists
It shifts in detection case 2, so that the fluid-mixing into piston cylinder 1 forms pressure difference in the two sides of piston 4, piston 4 is two
It under the action of a fluid detection chamber pressure difference, is slid to low pressure side, and is popped one's head in by Optical Fibre Differential-Pressure Seasor and detect pressure difference, established
Momentum pressure difference mathematical model, reckoning obtain fluid momentum.
Claims (3)
1. a kind of single-piston fiber-optic sensor probe flow rate testing methods, it is characterised in that:
Detection case (2) including Optical Fibre Differential-Pressure Seasor probe and with fluid distribution channel；
Optical Fibre Differential-Pressure Seasor probe includes the piston cylinder (1) of tubular, and there are two by being slideably positioned in work for tool in piston cylinder (1)
The fluid detection chamber that piston (4) in plug cylinder (1) separates, two fluid detection chambers are connected with detection case (2) respectively；
Detection case (2) passes through two fluid passages (10) with two fluid detection chambers respectively and is connected, also corresponding at detection case (2)
It is provided with the gas source (11) towards the middle position jet of two fluid passages (10), and fluid passage (10) and gas source (11) point
It is not set to the opposite sides of the fluid distribution channel in detection case (2), if having detected fluid flowing in detection case (2), starts
Gas source (11) air blowing forms air-flow, then detected fluid and air-flow interact in detection case (2) so that detected fluid with
The initial momentum of air-flow changes, and fluid-mixing shifts in detection case (2), so that into the mixing of piston cylinder (1)
Fluid forms pressure difference in the two sides of piston (4), and piston (4) is under the action of two fluid detection chamber pressure differences, to low pressure side
Sliding, and popped one's head in by Optical Fibre Differential-Pressure Seasor and detect pressure difference, momentum pressure difference mathematical model is established, reckoning obtains fluid momentum.
2. flow rate testing methods according to claim 1, it is characterised in that: the momentum pressure difference mathematical model is as follows: analysis
Relationship between transmission amount and pressure difference, if the speed of air-flow is Vs, the speed of detected fluid is V, wherein VsIt is to be sent out by gas source (11)
The air velocity shot out is known quantity, the momentum M of piston both ends pressure difference and two fluidss/ M is related, and wherein M is tested
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.
3. flow rate testing methods according to claim 1, it is characterised in that: the blowing direction of gas source (11) and detection case (2)
Interior fluid circulating direction is perpendicular.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610367241.9A CN106052781B (en) | 2016-05-30 | 2016-05-30 | A kind of single-piston optic flow sensor probe and its detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610367241.9A CN106052781B (en) | 2016-05-30 | 2016-05-30 | A kind of single-piston optic flow sensor probe and its detection method |
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| CN106052781B true CN106052781B (en) | 2019-03-08 |
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| CN107192480B (en) * | 2017-07-17 | 2023-03-24 | 河南科技大学 | Clamping force detection device of pot seedling planting machine |
| DE102017214370A1 (en) * | 2017-08-17 | 2019-02-21 | Landis + Gyr Gmbh | Transducer for a flowmeter with a stepped sidewall |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009063400A (en) * | 2007-09-06 | 2009-03-26 | Fiberlabs Inc | Differential optical fiber flow sensor and flow detection system using the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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