CN206038064U - Optical fiber detection fluid flow's sensor structure - Google Patents

Abstract

The utility model provides an optical fiber detection fluid flow's sensor structure, sensor probe includes the piston cylinder and sets up in the detection case of piston cylinder one side, the both ends of piston cylinder are sealed by the end cover respectively, it is provided with the piston to slide in the piston cylinder, all set up spring and piston rod between piston and the end cover, detecting through hole has all been seted up on the end cover, piston rod one end is fixed in on the piston, the other end slides and sets up in detecting through hole, and the end fixing of piston rod has light reflecting component, detecting through hole's the other end still is provided with the optical fiber detection end, the detection case is linked together through a fluid pathway respectively with the cavity of piston both sides, fluid pathway and air supply set up respectively in the relative both sides of fluid at the inside circulation path of detection case. Adopt traditional dynamometry mode in order to solve current flow sensor more, possess limitations such as measurement accuracy is not high, the power consumption is big, the problem that can not be competent at well in a lot of occasions. The utility model belongs to the flow measurement field.

Description

A kind of sensor construction of fiber laser arrays fluid flow

Technical field

This utility model is related to a kind of flow transducer, belongs to flow sensing monitoring technical field.

Background technology

Modern industry production especially, during automated production, is often required to various sensors monitor and control production During parameters, make equipment be operated in normal condition or optimum state, and make product reach best quality.Sensor Also such as commercial production, space development, marine exploration, environmental conservation, resource investigation, medical diagnosiss, biological work is penetrated into already The extremely general field of journey, even historical relic's protection etc..This utility model is that one of the sensor of numerous classifications flow is passed Sensor.With the development of sensor technology, occurred diversified flow transducer at present, it is the most frequently used have vane type, Eddy currents, toll bar vortex, hot wire type etc..But, the sensor such as vane type, eddy currents, toll bar vortex, hot wire type, Adopt traditional dynamometry mode more principle, possess the limitations such as certainty of measurement is not high, power consumption is big, can not be fine in many occasions It is competent on ground.

The content of the invention

The purpose of this utility model is：A kind of sensor construction of fiber laser arrays fluid flow is provided, it is existing to solve Adopt traditional dynamometry mode more flow transducer, possess the limitations such as certainty of measurement is not high, power consumption is big, in many occasions not The problem that can be competent at well.

Scheme of the present utility model is as follows：A kind of sensor construction of fiber laser arrays fluid flow, including sensor probe, Optical-electrical converter and signal processor, sensor probe include piston cylinder and are arranged at the detection case of piston cylinder side, piston cylinder Two ends closed by end cap respectively, sliding to be provided between the end cap at piston, piston and two ends in piston cylinder is respectively provided with spring, bullet One end of spring is fixed on piston, and the other end is fixed on end cap, and the two ends of piston are also respectively provided with reflecting piece, the end at two ends Cover, detect and in through hole, be provided with the fiber laser arrays end for pointing to reflecting piece, fiber laser arrays end has Incident optical and the output optical fiber, the output optical fiber at fiber laser arrays end are connected with optical-electrical converter, optical-electrical converter and signal processing Device is connected, and can determine whether the distance between reflecting piece and fiber laser arrays end by the power of the output optical fiber received signal, so as to Judge the sliding distance of piston, you can determine whether out the pressure reduction of the fluid into piston both sides；

There is fluid intake and fluid issuing on detection case so that the inside of fluid stream case after testing, detection case and piston cylinder The chamber of middle piston both sides is connected by a fluid passage respectively, and also including source of the gas, the supply direction of source of the gas points to two The centre position of fluid passage, and fluid passage and source of the gas are respectively arranged at fluid relative the two of detection case internal flow path Side, is arranged such, and when the fluid in detection case does not circulate, the Fluid pressure for flowing into two side cavity of piston should be identical, then live Plug can keep constant in equilbrium position, and after working as flow of fluid, the Fluid pressure for flowing into two side cavity of piston be it is different, then Piston can occur to slide, and this pressure change will be reflected in the change in optical signal of fibre-optical probe detection, i.e., by the sensing Device detects the information such as fluid flow.

Light source, Y types bonder and optical fiber are included also, light source is arranged at one end of optical fiber to be used for producing fiber-optic signal, light The optical signal that source sends is coupled in optical fiber, and the other end of optical fiber is divided into two-way light source incidence optical fiber Jing after Y type bonders, Two-way light source incidence optical fiber corresponds to two fiber laser arrays ends being linked in sensor probe respectively, and as fiber laser arrays end Incident optical, is irradiated on reflecting part, and reflected light after reflection is passed into the output optical fiber at two ends respectively by the output optical fiber Defeated to two single optical-electrical converters carry out opto-electronic conversion, and the signal of telecommunication after conversion is defeated respectively Jing after the process of A/D conversion units Enter to signal processor, signal processor carries out ratio computing to this two paths of signals again.

In order to avoid impact of the spring to sensor, the spring of piston both sides is symmetrical arranged, and the spring of piston both sides Structure and specification are identical, and when piston is located at the centre position of two ends end cap, the spring of piston both sides is in nature State, i.e. spring tensionless winkler foundation and compressive deformation；

For ensureing the sensing effect of fibre-optical probe, it is ensured that the distance between two ends fiber laser arrays end and reflecting piece balance, two Individual detection through hole is opened in the center position of place end cap, and two detection through holes and piston are coaxially disposed, reflecting piece with Fiber laser arrays end is vertically arranged, for being slidingly sealed formula structure between piston and the inwall of piston cylinder, to prevent the stream of piston both sides Body penetrates into mutually, is located on the inside of fiber laser arrays end and is additionally provided with sealed light-transmitting piece, i.e. sealed light-transmitting piece and inspection in detection through hole Survey sealing between the inwall of through hole to arrange, prevent fluid contamination fiber laser arrays end；

Used as preferred structure, the fiber laser arrays end is tightened in detection through hole, to ensure optical fiber by screw thread It is firm and accurate that probe is positioned, and end cap is rubber stopper, it is ensured that on the premise of structural reliability, structure more simplifies；

For ensureing the sealing effectiveness of piston, prevent fluid Jing piston ridges from flowing into spring place chamber, piston and piston cylinder Inwall between be provided with piston packing；

For ensureing the service life and using effect of sensor, the preferred hard alloy of material of piston；

For preventing the impurity in fluid from entering sensor probe, on the fluid passage, filter screen is provided with.

The fibre bundle at fiber laser arrays end is formed by incident optical and the output optical fiber set armouring, the incident optical other end and light Source is docked, and to couple incident illumination, the exit end of the output optical fiber is connected with light-sensitive element, output light intensity signal.

The momentum pressure reduction mathematical model is as follows：Relation between analysis transmission amount and pressure reduction, if the speed of air-flow is V_s, The speed of detected fluid is V, wherein V_sBe the air velocity emitted by source of the gas, be known quantity, piston two ends pressure difference with The momentum M of two fluids_s/ M is relevant, wherein M be detected fluid momentum, M_sFor air-flow momentum, respectively withWith V²It is directly proportional.

M=kV²；

K is constant；

I.e.：

Then：

Wherein, k₁For known quantity, so as to the value that can try to achieve V after known Δ P, in test, we take V_sEqual to 5m/ S, takes k₁=2, V change by 1m/s to 2m/s, and its curve is as described in Figure 4.

Compared with prior art, major advantage is as follows for this utility model：Through structure design, theoretical research and experimental analysiss Understand, the sensor has less structure, higher degree of accuracy and reliability, well adapting to property and interchangeability etc., the biography Sensor can be suitably used for numerous fluid flow detection occasions, and photoelectric sensing principle is applied to field of flow detection, output signal Jing After opto-electronic conversion and signal processing are calculated, output valve will change at double, so as to improve detection sensitivity, with highly important Actual application value, the design and popularization to novel flow rate sensor serve great impetus.

Meanwhile, the differential pressure pick-up has pressure differential in two side liquids using piston cylinder operator as pressure detection device When, piston is translational motion, it is only necessary to can calculate fluid pressure differential according to the translational movement of piston, for the requirement of Fibre Optical Sensor It is lower, calculate and measure more simple, and piston structure is more stable, is difficult, by external interference, to be hardly damaged, service life is more For permanent so that the reliability of sensor, adaptability and interchangeability have compared with much progress, are suitable for use as the survey of fluid flow Amount；The intensity compensation principle of sensor is more simple, and practicality is higher.

Description of the drawings

Fig. 1 is the systematic schematic diagram of the sensor；

Fig. 2 is the sectional view of the sensor probe configuration；

Fig. 3 is detection principle diagram；

Fig. 4 is the relation of fluid momentum and piston both sides pressure difference.

Specific embodiment

It is for making the purpose of this utility model, technical scheme and advantage clearer, new to this practicality below with reference to accompanying drawings Type is described in further detail,

Embodiment：

Referring to figs. 1 to Fig. 3, the present embodiment provides a kind of sensor construction of fiber laser arrays fluid flow, including sensor Probe 1, optical-electrical converter 2 and signal processor 3, sensor probe 1 include piston cylinder 11 and are arranged at 11 side of piston cylinder Detection case 12, the two ends of piston cylinder 11 are closed by end cap 13 respectively, and slip in piston cylinder 11 is provided with piston 14, piston 14 and work It is provided between the inwall of plug cylinder 11 between the end cap 13 of piston packing 141, piston 14 and two ends and is respectively provided with spring 15, spring 15 one end is fixed on piston 14, and the other end is fixed on end cap 13, and the two ends of piston 14 are also respectively provided with reflecting piece 16, Detection through hole 17 is offered on the end cap 13 at two ends, is detected and is provided with the fiber laser arrays end for pointing to reflecting piece 16 in through hole 17 19, fiber laser arrays end 19 has incident optical 191 and the output optical fiber 192, and the fibre bundle at fiber laser arrays end 19 is by incident optical 191 Form with the set armouring of the output optical fiber 192, light source 5 is arranged at one end of optical fiber 7 to be used for producing fiber-optic signal, what light source 5 sent Optical signal is coupled in optical fiber 7, and the other end of optical fiber 7 is divided into two-way light source incidence optical fiber, two-way Jing after Y types bonder 6 Light source incidence optical fiber corresponds to two fiber laser arrays ends 19 being linked in sensor probe 1 respectively, and as fiber laser arrays end 19 Incident optical 191, be irradiated on reflecting part 18, reflected light after reflection enters the output optical fiber 192 at two ends, by outgoing Optical fiber 192 is respectively transmitted to two single optical-electrical converters 2 and carries out opto-electronic conversion, and the signal of telecommunication Jing A/D conversions after conversion are single Unit 8 is separately input to signal processor 3 after processing, and signal processor 3 carries out ratio computing to this two paths of signals again.

There is fluid intake 121 and fluid issuing 122 on detection case 12 so that the inside of fluid stream case 12 after testing, detection Case 12 is connected by a fluid passage 123 respectively with the chamber of 14 both sides of piston in piston cylinder 11, on fluid passage 123 Filter screen 125 is provided with, the centre position of two fluid passages 123, and 123 He of fluid passage are pointed in the supply direction of source of the gas 124 Source of the gas 124 is respectively arranged at opposite sides of the fluid in 12 internal flow path of detection case, is arranged such, when in detection case 12 When fluid does not circulate, the Fluid pressure for flowing into 14 liang of side cavities of piston should be identical, then piston 14 can be kept in equilbrium position It is constant, and after working as flow of fluid, the Fluid pressure for flowing into 14 liang of side cavities of piston is different, then piston 14 can occur to slide, This pressure change will be reflected in the change in optical signal of fibre-optical probe detection, i.e., detect fluid flow by the sensor Etc. information.

The spring 15 of 14 both sides of piston is symmetrical arranged, and the complete phase of the structure and specification of the spring 15 of 14 both sides of piston Together, when piston 14 is located at the centre position of two ends end cap 13, the spring 15 of 14 both sides of piston is in naturalness, i.e. spring Tensionless winkler foundation and compressive deformation, two detection through holes 17 are opened in the center position of place end cap 13, two detection through holes 17 And piston 14 is coaxially disposed, reflecting piece 16 is vertically arranged with fiber laser arrays end 19, between the inwall of piston 14 and piston cylinder 11 For being slidingly sealed formula structure, detect that the inner side for being located at fiber laser arrays end 19 in through hole 17 is additionally provided with sealed light-transmitting piece 18, i.e., it is close Sealing between the inwall of envelope light transmission piece 18 and detection through hole 17 is arranged,

As shown in figure 3, the test fluid (i.e. air-flow) entered from source of the gas 124 is coupled with detected fluid and is interacted, In the presence of detected fluid, test fluid flow fields are shifted to the right by being uniformly distributed.When test fluid flow fields are uniformly distributed When (detected fluid does not flow), the fluid flow into sensor or so test chamber is identical, and the fluid pressure of intracavity is detected in left and right Power is equal, and piston rest is motionless；And when (detected fluid flows to the right) after fluid flow fields are shifted to the right is tested, into biography The fluid flow increase of sensor right chamber, the fluid flow into sensor left chamber reduces, so as to cause sensor or so test chamber Produce pressure differential.The left and right skew of piston 14 has directly driven the movement of reflecting piece 16 on piston 14, and makes fiber laser arrays end 19 Change with the distance between reflecting piece 16, cause that the intensity of two output optical signals are different, light-sensitive element turns optical signal The signal of telecommunication is turned to, the signal is input in computer after the processing links such as amplification, rectification and filtering, coordinate corresponding algorithm meter Calculate, it can be deduced that the fluid pressure differential of two test positions.Momentum pressure reduction mathematical model is resettled, reckoning draws fluid momentum.

Claims (8)

1. a kind of sensor construction of fiber laser arrays fluid flow, it is characterised in that：Including sensor probe (1), opto-electronic conversion Device (2) and signal processor (3), sensor probe (1) include piston cylinder (11) and are arranged at the detection of piston cylinder (11) side Case (12), the two ends of piston cylinder (11) are closed by end cap (13) respectively, and sliding in piston cylinder (11) is provided with piston (14), piston (14) spring (15) is respectively provided with and the end cap (13) at two ends between, and one end of spring (15) is fixed on piston (14), the other end It is fixed on end cap (13), the two ends of piston (14) are also respectively provided with reflecting piece (16), open up on the end cap (13) at two ends There is detection through hole (17), detect and in through hole (17), be provided with the fiber laser arrays end (19) for pointing to reflecting piece (16), fiber laser arrays The output optical fiber (192) and the photoelectricity that end (19) has incident optical (191) and the output optical fiber (192), fiber laser arrays end (19) turns Parallel operation (2) is connected, and optical-electrical converter (2) is connected with signal processor (3)；

There is fluid intake (121) and fluid issuing (122) on detection case (12) so that the inside of fluid stream case (12) after testing, Detection case (12) is connected by a fluid passage (123) respectively with the chamber of piston (14) both sides in piston cylinder (11), also Including source of the gas (124), the centre position of two fluid passages (123), and fluid passage are pointed in the supply direction of source of the gas (124) And source of the gas (124) is respectively arranged at opposite sides of the fluid in detection case (12) internal flow path (123).

2. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：Light is included also Source (5), Y type bonders (6) and optical fiber (7), light source (5) is arranged at one end of optical fiber (7) to be used for producing fiber-optic signal, light source (5) optical signal for sending is coupled in optical fiber (7), and the other end of optical fiber (7) is divided into two-way light Jing after Y type bonders (6) Source incident optical, two-way light source incidence optical fiber correspond to two fiber laser arrays ends (19) being linked in sensor probe (1) respectively, And the incident optical (191) as fiber laser arrays end (19).

3. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：Piston (14) two The spring (15) of side is symmetrical arranged, and the structure and specification of the spring (15) of piston (14) both sides are identical, piston (14) Positioned at the centre position of two ends end cap (13) when, the spring (15) of piston (14) both sides is in naturalness.

4. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：Two detections are logical Hole (17) is opened in the center position of place end cap (13), and two detections through hole (17) and piston (14) are coaxially disposed, Reflecting piece (16) is vertically arranged with fiber laser arrays end (19), is to be slidingly sealed formula between the inwall of piston (14) and piston cylinder (11) Structure, is located in detection through hole (17) on the inside of fiber laser arrays end (19) and is additionally provided with sealed light-transmitting piece (18).

5. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：The optical fiber inspection Survey end (19) to be tightened in detection through hole (17) by screw thread, end cap (13) is rubber stopper.

6. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：Piston (14) with Piston packing (141) is provided between the inwall of piston cylinder (11).

7. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：The fluid leads to Filter screen (125) is provided with road (123).

8. a kind of sensor construction of fiber laser arrays fluid flow according to claim 1, it is characterised in that：Fiber laser arrays end (19) fibre bundle by incident optical (191) and the output optical fiber (192) set armouring form, incident optical (191) other end with Light source is docked, and to couple incident illumination, the exit end of the output optical fiber (192) is connected with light-sensitive element, output light intensity signal.