CN202209975U

CN202209975U - Floater-type fiber liquid level meter

Info

Publication number: CN202209975U
Application number: CN2011202534984U
Authority: CN
Inventors: 赵恩国
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-07-19
Filing date: 2011-07-19
Publication date: 2012-05-02
Anticipated expiration: 2021-07-19

Abstract

The utility model discloses a floater-type fiber liquid level meter, which consists of a protective cylinder, a fiber grating, a membrane fixing cylinder, a hard core membrane, a floater, an installation base and an armored cable, wherein the fiber grating and the floater are connected to two sides of the hard core membrane respectively and are both located on the central axis of the hard core membrane. In this way, when a liquid level to be measured changes, the buoyancy of the floater changes to result in the change of a concentrated force applied to a hard core of the hard core membrane, therefore, micro displacement of the hard core of the hard core membrane is caused to stretch or compress the fiber grating so as to lead to movement of a central reflection wavelength of the fiber grating, and finally, the change information of the liquid level to be measured can be detected by sensing the amount of movement of the central reflection wavelength of the fiber grating. The floater-type fiber liquid level meter disclosed by the utility model is simple in structure and high in stability and reliability.

Description

A kind of float-type fiber optic liquid height meter

Technical field:

The utility model relates to sensory field of optic fibre, particularly a kind of float-type fiber optic liquid height meter.

Background technology:

High-precision level gauging is being brought into play important effect in many industry spot, be widely used in the engineering fields such as building, petrochemical complex, electric power, water conservancy and hydropower.At present; Using comparatively widely, mostly liquid level gauge is the electrical type liquid level gauge; For example magnetostriction liquidometer, capacitance level gauge, ultrasonic level gage etc.; These liquid level gauges all have certain limitation, and for example: long-time stability and the reliability in strong electromagnetic, inflammable and explosive, bigger rugged surroundings of thunderbolt probability, used are bad.

In recent ten years; Because the fast development of fiber grating sensing technology; More since fiber grating have anti-electromagnetic interference (EMI), anti-thunderbolt, can application in inflammable and explosive environment, plurality of advantages such as long-term reliability and good stability, in the level gauging field, receive more and more scientific workers' favor.

2002; People such as burnt star have set up a kind of float-type fiber grating liquid level meter model in International Symposium on Precision Mechanical Measurements (ISPMM ' 2002) meeting paper, and have carried out detailed theoretical derivation.In this scheme, have two significant disadvantages:

1) fiber grating is directly immersed in the testing liquid.This both had been unfavorable for the protection of fiber grating, also was not easy to on-the-spot the installation, more be unfavorable for commercialization;

2) come the gravity of balance floating drum with spring.Two hooks of spring can rotate relatively, and floating drum is difficult to reach balance, cause long-time stability and reliability not high.

Summary of the invention:

The utility model is to the deficiency of prior art, and a kind of high precision, float-type fiber optic liquid height meter simple in structure are provided, and solves technical matterss such as medium-term and long-term stability of prior art and reliability be undesirable.

This float-type fiber optic liquid height meter of the utility model is made up of a protection tube, a fiber grating, a diaphragm stationary magazine creel, a hard core diaphragm, a mounting base, a floating drum and an armouring optical cable.

Wherein, Described hard core diaphragm is processed through precision optical machinery by resilient material, and wherein the hard core of a side is an optical fiber diaphragm bearing, is used for fixing the tail optical fiber of described fiber grating one end; And the hard core of opposite side is said floating drum connecting hole; Be used for being connected of diaphragm and described floating drum, described fiber grating and described floating drum are connected to the both sides of described hard core diaphragm, and all on the central axis of described hard core diaphragm.

The basic operational steps that the float-type fiber optic liquid height meter of the utility model is made is following: 1) utilize prior art to be fixed on optical fiber diaphragm bearing fiber grating one end tail optical fiber; 2) periphery with hard core diaphragm utilizes prior art to be fixed on the relevant position on the diaphragm stationary magazine creel, and carries out sealing test; 3) after prestretched, the tail optical fiber of the fiber grating other end is fixed on the optical fiber stationary magazine creel bearing on the diaphragm stationary magazine creel; 4) protection tube and mounting base are assembled together through screw thread and the sealing of diaphragm stationary magazine creel respectively; 5) tail optical fiber utilizes the armouring cable protection, and utilizes fluid sealant to seal; 6) floating drum links together at described floating drum connecting hole through hook and hard core diaphragm.

Further, the material of described hard core diaphragm can be a kind of or other better elastic material of stainless steel, bronze.

Further, described hard core diaphragm can be a kind of of flat diaphragm or convoluted diaphragm or corrugated tube or bellows.

Further, described fiber grating can be substituted by fiber F-P cavity or string wire.

Further, described floating drum, its shape can be right cylinder or multiple edge body.

Further, the dimensional parameters and the shape thereof of dimensional parameters, material parameter and described floating drum through changing described hard core diaphragm can realize the adjustment of fiber optic liquid height meter liquid level sensitivity coefficient.

The basic functional principle of the utility model is: when liquid level to be measured changes; The suffered buoyancy of floating drum changes, and causes the variation that is applied to the concentrated force on the hard core diaphragm, and then causes the micrometric displacement of the hard core of diaphragm; Fiber grating is received stretch or compression; Thereby cause the moving of foveal reflex wavelength of fiber grating, the amount of movement of the foveal reflex wavelength through the detection optical fiber grating can detect the change information of liquid level to be measured.

The utility model and prior art compare, and its effect is actively with tangible.The hard core diaphragm of the utility model utilization replaces spring, comes the gravity of balance floating drum by hard core diaphragm, makes liquid level gauge be easier to balance; And fiber grating is positioned in the protection tube, separate with testing liquid, avoided the liquid corrosion of being corroded property of fiber grating, be easier to commercialization.These all are more conducive to the raising of this float-type fiber optic liquid height meter long-time stability and reliability engineering index.

Description of drawings:

Fig. 1 is the structural representation of the float-type fiber optic liquid height meter of the utility model.

Among the figure, 1-protects tube; The 2-tail optical fiber; The 3-fiber grating; 4-diaphragm stationary magazine creel; The hard core diaphragm of 5-; The 6-floating drum; 7-floating drum connecting hole; The 8-mounting base; 9-optical fiber diaphragm bearing; 10-optical fiber stationary magazine creel bearing; The 11-fluid sealant; 12-armouring optical cable.

Embodiment:

Embodiment 1:

Practical implementation below in conjunction with 1 pair of the utility model of accompanying drawing elaborates:

As shown in Figure 1; The float-type fiber optic liquid height meter of the utility model is made up of 1, tail optical fiber of a protection tube 2, fiber grating 3, diaphragm stationary magazine creel 4, hard core diaphragm 5, floating drum 6, a mounting base 8 and an armouring optical cable 12.Wherein, Described hard core diaphragm 5 is processed through precision optical machinery by resilient material; Wherein the hard core of a side is a described optical fiber diaphragm bearing 9; The tail optical fiber that is used for fixing described fiber grating 3 one ends, and the hard core of the opposite side of described hard core diaphragm 5 is described floating drum connecting hole 7 is used for and being connected of described floating drum 6.

Particularly, the manufacturing process of present embodiment is:

1) earlier utilize prior art to be fixed on the above optical fiber diaphragm bearing 9 of described hard core diaphragm 5 an end tail optical fiber of described fiber grating 3;

2) periphery with described hard core diaphragm 5 utilizes prior art to be fixed on the relevant position on the described diaphragm stationary magazine creel 4, and carries out sealing test;

3), utilize prior art that the tail optical fiber of this end of described fiber grating 3 is fixed on the above optical fiber stationary magazine creel bearing 10 of described diaphragm stationary magazine creel 4 with after described fiber grating 3 prestretcheds;

4) described protection tube 1 is assembled together through screw thread and 4 sealings of described diaphragm stationary magazine creel;

5) the described armouring optical cable 12 of described tail optical fiber 2 usefulness is protected, and carries out and the described seal approach of protecting between the tube 1 with described fluid sealant 11;

6) described mounting base 8 is assembled together through screw thread and 4 sealings of described diaphragm stationary magazine creel;

7) described floating drum 6 links together at described floating drum connecting hole 7 through hook and described hard core diaphragm 5.

The course of work of the embodiment of the utility model is: with the described float-type fiber optic liquid height meter of the utility model through described mounting base 8 firm fixation on housing or motionless basic thing; And the parts below the described floating drum 6 are placed on the testing liquid liquid level when following; Like this, when liquid level to be measured changed, described floating drum 6 suffered buoyancy changed; Cause the variation of the concentrated force that is applied to described hard core diaphragm 5 upper hard-core places; And then cause the hard core generation micrometric displacement of described hard core diaphragm 5, and described fiber grating 3 is received stretch or compression, thus the moving of foveal reflex wavelength that causes described fiber grating 3; The amount of movement of the foveal reflex wavelength through surveying described fiber grating 3 can detect the change information of liquid level to be measured.

Claims

1. float-type fiber optic liquid height meter; Constitute by a protection tube, a fiber grating, a diaphragm stationary magazine creel, a hard core diaphragm, a mounting base, a floating drum and an armouring optical cable; It is characterized in that: described hard core diaphragm both sides are respectively arranged with optical fiber diaphragm bearing and floating drum connecting hole, and its periphery utilizes the prior art sealing and fixing on described diaphragm stationary magazine creel; Described fiber grating and described floating drum are connected to the both sides of described hard core diaphragm; And all on the central axis of described hard core diaphragm; One end of described fiber grating is fixed on the optical fiber diaphragm bearing of hard core diaphragm; Behind the prestretching, the other end is fixed on the optical fiber stationary magazine creel bearing of described diaphragm stationary magazine creel; Described protection tube and described mounting base link together through screw thread and described diaphragm stationary magazine creel respectively, and tail optical fiber is with described armouring cable protection, and take seal approach; And described floating drum is suspended in the floating drum connecting hole of described hard core diaphragm through hook.

2. float-type fiber optic liquid height meter as claimed in claim 1, it is further characterized in that: described hard core diaphragm can be a kind of of flat diaphragm or convoluted diaphragm or corrugated tube or bellows.

3. float-type fiber optic liquid height meter as claimed in claim 1, it is further characterized in that: described fiber grating can be substituted by fiber F-P cavity or string wire.

4. float-type fiber optic liquid height meter as claimed in claim 1, it is further characterized in that: described floating drum, its shape can be right cylinder or multiple edge body.