CN201155966Y

CN201155966Y - Optical fibre grating displacement meter

Info

Publication number: CN201155966Y
Application number: CNU2008200791826U
Authority: CN
Inventors: 刘海涛
Original assignee: BEIJING JIKANG TECHNOLOGY Co Ltd
Current assignee: BEIJING JIKANG TECHNOLOGY Co Ltd
Priority date: 2008-02-25
Filing date: 2008-02-25
Publication date: 2008-11-26
Anticipated expiration: 2018-02-25

Abstract

The utility model provides a fiber grating displacement meter, which relates to the engineering measurement tools. The displacement meter comprises a fiber, a wire rope, a sleeve tube and end plugs of two ends thereof; wherein, a fiber inlet and a fixed rod interface are arranged on one end plug; a fiber outlet and a wire rope outlet are arranged on the other end plug; the inner part of the sleeve tube are orderly provided with a fixed pressing block, strain beams and an installation seat; the fixed pressing block, the strain beams and the installation seat are mutually connected; a strain grating and a temperature compensated grating are respectively stuck on the strain beams of two sides of the fixed pressing block; the fiber extends in from the fiber inlet and extends out from the fiber outlet via the strain grating and temperature compensated grating on the strain beams; one end of the wire rope is connected with the strain beam and the other end extends out of the wire rope outlet. The fiber grating displacement meter has the advantages of good lightening-stroke protection performance, strong anti-electromagnetic interference performance, long measuring distance, good reliability, wide measurement range and high measurement precision. In addition, the displacement meter has flexibility and expansibility of various measuring range.

Description

Optical Fiber Grating Displacement Meter

Technical field

The utility model relates to the engineering measurer, and particularly a kind of Optical Fiber Grating Displacement Meter is used to monitor folding degree, and the soil body settling amount on building foundation or road basis of architecture structural crack or seam.

Background technology

At present, the normal measurer that adopts of the displacement deformation of monitoring building structure is an electronic sensor, the folding degree of the structural cracks of covil construction, hydraulic engineering or seam for example, and building foundation or the road and rail roadbed bankets or the soil body settling amount of other similar structures all obtains by Displacement Measurement distortion, because electronic sensor self exists anti-thunderbolt poor performance, anti-electromagnetic interference performance is poor, measuring distance is nearer defective, so caused poor reliability, measurement range is little, measuring accuracy is not high problem.

Summary of the invention

The purpose of this utility model is the defective at above-mentioned prior art, provides good, the anti-electromagnetic interference performance of a kind of anti-thunderbolt performance strong, measuring distance Optical Fiber Grating Displacement Meter far away, has good reliability, measurement range is big, measuring accuracy is high advantage.

The technical scheme taked of the utility model is to achieve these goals: a kind of Optical Fiber Grating Displacement Meter, comprise optical fiber, wire rope, the end at sleeve pipe and two ends thereof is stifled, stifled optical fiber inlet and the fixed bar interface of being provided with of one end, the other end blocks up and is provided with optical fiber outlet and wire rope outlet, inside pipe casing is provided with interconnective fixedly briquetting in turn, strain beam and mount pad, fixedly be pasted with strain grating and temperature compensation grating on the strain beam of briquetting both sides respectively, optical fiber is stretched into by the optical fiber inlet, and strain grating on strain beam and temperature compensation grating, stretched out by the optical fiber outlet, wire rope one end is connected on the strain beam, the other end stretches out the wire rope outlet.The utility model utilizes grating, optical fiber to realize accurate measurement to the wire rope stretching displacement by the strain measurement to the strain beam surface.Grating fibers itself has strong, the measuring distance advantage far away of good, the anti-electromagnetic interference performance of anti-thunderbolt performance, and the temperature compensation grating has temperature compensation function in addition, therefore the utlity model has good reliability, measurement range is big, measuring accuracy is high characteristics.

Change the direction of external force for convenience, be provided with fixed pulley between the wire rope of described inside pipe casing and the strain beam.

Described fixed pulley is the U groove bearing.

In order to realize the flexible expansion of different ranges, described wire rope exports external bourdon tube adapter.Realized the transformation of different ranges making the easier realization seriation of product by the length that changes the spring that articulates in the bourdon tube adapter.

The beneficial effects of the utility model are: compared to existing technology, the utility model self has that good, the anti-electromagnetic interference performance of anti-thunderbolt performance is strong, measuring distance is far away, good reliability, measurement range is big, measuring accuracy is high advantage, also has the flexible expansion of different ranges in addition.

Description of drawings

Fig. 1 is the utility model master cut-open view;

Fig. 2 is the vertical view that the utility model is cut sleeve pipe open.

Among the figure: fixedly briquetting, 6 strain gratings, 7 fixed pulleys, 8 bourdon tube adapters, 9 wire rope, 10 strain beams, 11 mount pads, 12 sleeve pipes, 13 O-ring seals, 14 ends block up, 15 wire rope export for 1 optical fiber inlet, 2 fixed bar interfaces, 3 optical fiber, 4 temperature compensation gratings, 5, the outlet of 16 optical fiber.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments, but not as to qualification of the present utility model.

A kind of Optical Fiber Grating Displacement Meter shown in Fig. 1-2 comprises that the end at optical fiber 3, wire rope 9, sleeve pipe 12 and two ends thereof blocks up 14, is provided with O-ring seal 13 between end stifled 14 and the sleeve pipe 12.Wherein, an end stifled 14 is provided with optical fiber inlet 1 and fixed bar interface 2, the other end stifled 14 is provided with optical fiber outlet 16 and wire rope exports 15.Sleeve pipe 12 inside are provided with strain beam 10, and strain beam 10 tops are provided with fixedly that briquetting 5, bottom are provided with mount pad 11.Fixedly briquetting 5 one side bonds on the strain beam 10 have strain grating 6.Owing to unavoidably can produce variation of temperature in the practical application, and the numerical value that variation of temperature can directly cause measuring produces drift, in order to revise Temperature Influence, the opposite side of the fixedly briquetting 5 of strain beam 10 bonding performance and strain grating 6 identical temperature compensation gratings 4.Because fixedly the acting in conjunction of briquetting 5 and mount pad 11 makes strain beam 10 do the time spent at power F, have only strain grating 6 places to have distortion and this is out of shape by the 6 complete perception of strain grating, and temperature compensation grating 4 one ends are not subjected to the influence of tensile force f.When variation of ambient temperature, it is identical that strain grating 6 and temperature compensation grating 4 are subjected to Temperature Influence.So, strain grating 6 is a temperature influence, is subjected to the influence of tensile force f simultaneously again; And 4 simple temperature influences of temperature compensation grating; So cut the computing method removal temperature effect of the measured value of temperature compensation grating 4 with the measured value of strain grating 6, thereby realized auto thermal compensation, make the utility model not be subjected to the influence of ambient temperature when measuring, make the measurement of displacement more accurate, precision can reach 0.1%FS.Optical fiber 3 is stretched into by optical fiber inlet 1 and strain grating 6 on strain beam 10 and temperature compensation grating 4, stretched out by optical fiber outlet 16.Wire rope 9 one ends are connected on the strain beam 10, the other end is walked around fixed pulley 7 and stretched out wire rope outlet 15 and bourdon tube adapter 8.The displacement meter of different ranges can be realized by the length that changes the spring of hanging in the bourdon tube adapter 8, made the easier realization seriation of product.

Principle of work of the present utility model: as shown in Figure 1, spring in the bourdon tube adapter 8 links to each other with wire rope 9, effect lower spring at external force F is pulled different length, act on the elastic strain beam 10 by wire rope 9 and fixed pulley 7 F that exerts all one's strength, strain beam 10 occurs bending and deformation under the effect of power F, the distortion that strain beam 10 is produced is bonded to 6 perception of strain grating on it, strain grating 6 is sent to the size of the deflection that perceives to signal by optical fiber 3 the grating analyser of far-end, just can know the length that spring stretches by the grating analyser to the analysis of different wave length light signal, thereby realize the measurement of displacement.

The utility model self has that good, the anti-electromagnetic interference performance of anti-thunderbolt performance is strong, measuring distance is far away, good reliability, measurement range is big, measuring accuracy is high advantage, also has the flexible expansion of different ranges in addition.

Above-described embodiment, the utility model embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solutions of the utility model scope and replacing all should be included in the protection domain of the present utility model.

Claims

1. Optical Fiber Grating Displacement Meter, it is characterized in that: comprise optical fiber, wire rope, the end at sleeve pipe and two ends thereof is stifled, stifled optical fiber inlet and the fixed bar interface of being provided with of one end, the other end blocks up and is provided with optical fiber outlet and wire rope outlet, inside pipe casing is provided with interconnective fixedly briquetting in turn, strain beam and mount pad, fixedly be pasted with strain grating and temperature compensation grating on the strain beam of briquetting both sides respectively, optical fiber is stretched into by the optical fiber inlet, and strain grating on strain beam and temperature compensation grating, stretched out by the optical fiber outlet, wire rope one end is connected on the strain beam, the other end stretches out the wire rope outlet.

2. Optical Fiber Grating Displacement Meter according to claim 1 is characterized in that: be provided with fixed pulley between the wire rope of described inside pipe casing and the strain beam.

3. Optical Fiber Grating Displacement Meter according to claim 2 is characterized in that: described fixed pulley is the U groove bearing.

4. according to the described Optical Fiber Grating Displacement Meter of the arbitrary claim of claim 1-3, it is characterized in that: described wire rope exports external bourdon tube adapter.