CN208818203U - A kind of novel optical fiber inclination sensor of stretching structure - Google Patents

Abstract

Originally practical to disclose a kind of novel optical fiber inclination sensor of stretching structure, including package casing and pendulum；Package casing outer top and outer bottom end are equipped with steel disc, and steel disc is equipped with fixed mounting hole；The first guide rail and the second guide rail are equipped with inside package casing, the first guide rail is equipped with sliding block, and the second guide rail is equipped with limiter；Pendulum is made of swing rod, rectangle steel part and weight, and the top bearing of swing rod is mounted at the first guide rail central axes, and the bottom end of swing rod is threadedly coupled rectangle steel part, and rectangle steel part is threadedly coupled weight, and weight bottom end is fixed by screws package casing；Rectangle steel part two sides connect limiter；The upper and lower side of sliding block and rectangle steel part wears fine steel tube, and package casing is outer interior equipped with two groups of sensor fibres vertically downward, and the upper and lower side of two groups of sensor fibres is both secured in fine steel tube；This is practical can to carry out grade level highly sensitive detection by sensor fibre, have reusable, light weight, high sensitivity, it is at low cost many advantages, such as.

Description

A kind of novel optical fiber inclination sensor of stretching structure

Technical field

This is practical to be related to a kind of inclination sensor, more particularly, to a kind of novel optical fiber inclination sensor of stretching structure, It is related to groundwork detection technical field.

Background technique

In recent years, with the construction of the heavy constructions such as Stadium, natatorium, business high building, the monitoring of ground health by Gradually become the hot spot studied both at home and abroad, especially optical fiber inclination sensor has received widespread attention.Compared to traditional electronic type Inclination sensor, optical fiber inclination sensor have reusable, light weight, high sensitivity, it is at low cost many advantages, such as.Traditional electricity That there are sensitivity is lower for minor inclination sensor, and measuring signal is vulnerable to external interference, the not strong defect of stability, and current optical fiber The product market of dipmeter is substantially a vacancy, it is therefore desirable to design it is a kind of have reusable, light weight, high sensitivity, at The optical fiber inclination sensor of this low plurality of advantages.

Utility model content

This practical technical problems to be solved is to overcome the defect of existing conditional electronic formula inclination sensor, provides a kind of drawing The novel optical fiber inclination sensor for stretching structure, to solve the above problems.

To achieve the above object, originally practical to provide the following technical solutions: a kind of novel optical fiber inclination sensing of stretching structure Device, including package casing and pendulum；The package casing outer top and outer bottom end are provided with steel disc, are provided on the steel disc The fixed mounting hole of hollow out；The first guide rail being parallel to each other and second is disposed with inside the package casing from top to bottom to lead Rail is provided with two groups of centrosymmetric sliding blocks on first guide rail, be provided on second guide rail two groups it is centrosymmetric Limiter；The pendulum is made of swing rod, rectangle steel part and weight, and the top bearing of the swing rod is mounted on the first guide rail axis At line, the bottom end of the swing rod is threadedly coupled rectangle steel part, and the rectangle steel part is threadedly coupled weight, and the weight bottom end passes through Screw is fixedly connected with package casing；Rectangle steel part two sides are flexibly connected limiter；The sliding block and rectangle steel part up and down It holds and wears fine steel tube, it is interior outside the package casing to be provided with two groups of sensor fibres vertically downward, sensor fibre described in two groups Upper and lower side be both secured in fine steel tube.

As a kind of originally practical optimal technical scheme, it is provided on the sliding block, limiter and rectangle steel part several Equally distributed fixed point.

A kind of optimal technical scheme practical as this, the package casing are cuboid, the package casing and weight 304 stainless steels are all made of to be made.

A kind of optimal technical scheme practical as this, the sensor fibre and fine steel tube use PY-51 type AB viscose glue glue It connects.

A kind of optimal technical scheme practical as this, the length of the fine steel tube are disposed as 20mm.

A kind of optimal technical scheme practical as this, the part of the force of sensor fibre described in two groups are isometric.

Compared with prior art, this practical beneficial effect is: this is practical to have resistant to high temperatures, corrosion-resistant, impact resistance, small swollen The advantages such as swollen coefficient and splendid processing characteristics can carry out grade level highly sensitive detection, tool by sensor fibre Have reusable, light weight, high sensitivity, it is at low cost many advantages, such as.

Detailed description of the invention

Attached drawing is used to provide to be further understood to originally practical, and constitutes part of specification, practical reality with this It applies example and is used to explain together practical, do not constitute a limitation practical to this.In the accompanying drawings:

Fig. 1 is this utility structure schematic diagram；

Fig. 2 is that this practical inclination sensor measures schematic diagram

Fig. 3 is that this practical inclination sensor a measures schematic diagram；

Fig. 4 is that this practical inclination sensor b measures schematic diagram；

Fig. 5 be this practical fibre strain sensitivity and graph of relation；

1, fixed mounting hole in figure；2, sensor fibre；3, the first guide rail；4, sliding block；5, fine steel tube；6, swing rod；7, second Guide rail；8, limiter；9, rectangle steel part；10, weight；11, package casing；12, screw；13, steel disc；100, pendulum.

Specific embodiment

Below in conjunction with the attached drawing in this practical embodiment, the technical solution in this practical embodiment is carried out clear, complete Site preparation description, it is clear that described embodiment is only that this practical a part of the embodiment is based on instead of all the embodiments Embodiment during this is practical, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment belongs to the range of this practical protection.

Embodiment 1

As shown in Figs. 1-5, originally practical that a kind of novel optical fiber inclination sensor of stretching structure, including package casing 11 are provided With pendulum 100；11 outer top of package casing and outer bottom end are provided with steel disc 13, and the fixed installation of hollow out is provided on steel disc 13 Hole 1；The first guide rail 3 and the second guide rail 7 being parallel to each other, the first guide rail 3 are disposed with inside package casing 11 from top to bottom On be provided with two groups of centrosymmetric sliding blocks 4, two groups of centrosymmetric limiters 8 are provided on the second guide rail 7；Pendulum 100 by Swing rod 6, rectangle steel part 9 and weight 10 form, and the top bearing of swing rod 6 is mounted at 3 central axes of the first guide rail, the bottom of swing rod 6 End is threadedly coupled rectangle steel part 9, and rectangle steel part 9 is threadedly coupled weight 10, and 10 bottom end of weight is fixedly connected with encapsulation by screw 12 Shell 11 prevents the random swing of pendulum 100 during transportation from causing pullling for sensor fibre 2, removes screw when to be used again 12 measure；9 two sides of rectangle steel part are flexibly connected limiter 8, and limiter 8 is used to limit the amplitude of fluctuation of pendulum 100, can lead to The spacing for overregulating limiter 8 changes range；The upper and lower side of sliding block 4 and rectangle steel part 9 wears fine steel tube 5, package casing 11 Two groups of sensor fibres 2 vertically downward are provided in outer, the upper and lower side of two groups of sensor fibres 2 is both secured in fine steel tube 5.

Several equally distributed fixed points are provided on sliding block 4, limiter 8 and rectangle steel part 9；Equally distributed fixation Point is to also ensure the stress equalization in equilibrium state to make two optical fiber in left and right symmetrical；Package casing 11 is rectangular Body, package casing 11 and weight 10 are all made of 304 stainless steels and are made, so that single unit system has resistant to high temperatures, corrosion-resistant, resistance to punching It hits, there are also the advantages such as splendid processing characteristics for the small coefficient of expansion；Sensor fibre 2 and fine steel tube 5 use PY-51 type AB viscose glue glue It connects, from -20 to ± 130 DEG C of the curing agent operating temperature, after solidification, 150kg/cm can be reached by being glued shearing strength³, and Can resistant to high temperatures, antiacid alkali, organic solvent-resistant, so being suitable for metal material, timber, ceramics etc., it is viscous from each other It connects, usage scenario demand of the inclination sensor in reality can be met.The length of fine steel tube 5 is disposed as 20mm；Two groups of biographies Photosensitive fine 2 part of the force is isometric, guarantees the linearity and precision of sensor.

Specifically, the position that the sensor fibre of equal length maintains weight is flat when inclination sensor is in a horizontal position Surely.Swing rod total length be L3, upper end sensor fibre fixed point at a distance from swing rod shaft be L2, lower end sensor fibre fixed point with The distance of swing rod is L1.First guide rail is the size for adjusting L2, by adjusting L2=L1 is made, is made in conjunction with sensor is practical The consideration in size and encapsulating structure in, using the weight shape of cylindrical body, quality m=400g, radius R=20mm, Take upper end sensor fibre fixed point and the spacing L2 of swing rod shaft and lower end sensor fibre fixed point and swing rod the lowermost distance L1 is 25mm, and taking the length of swing rod is 115mm；The strain variation of two sensor fibres in left and right is expressed as Δ ε_i(i=1, 2) torque equilibrium equation of weight: mgL, is listed according to the mechanics of materials₃sinα-SEΔε₁L₂=0, thenIts In, in the case that tilt angle is smaller, that is, sin α: α, the relationship of the approximate linear ratio of strain variation and inclination angle should The sensor fibre strain sensitivity of structure isStrain sensitivity is maximum at this time；By being carried out to fixed mounting hole Screw is installed, so that sensor fibre dipmeter is fixed on the vertical plane of surveyed plane, if surveyed plane tilts, weight Hammer gravity into shape and keep vertical direction, and sensor fibre stress size and direction change, according to weight gravity and sensor fibre by The equalising torque relationship of power, can find out the strain sensitivity of single sensor fibreWherein, sensor fibre strains Changes delta ε can be measured by sensor fibre grating demodulation instrument, then can be by once demarcating to obtain Δ ε₀, then pass throughMeter Calculation obtains inclination angle alpha；

(1) work as L₂< L₁If being tilted to the left in x-y plane, it is as shown in Figure 2 that inclination sensor measures schematic diagram.By scheming It learns, sensor fibre swings trend and is closer to swing rod swing trend, therefore the biggish swing of amplitude can occur for swing rod pendulum, The measurement inaccuracy for leading to tilt detection structure, so working as L₂< L₁When, it is not suitable for actual measurement；

The method that this programme uses second point discussion, takes method in Fig. 2, can take to avoid the generation of such case L₂=L₁The case where effect it is best.

(2) work as L₂≥L₁If being tilted to the left in x-y plane, inclination sensor a measures schematic diagram, such as Fig. 3, two biographies The strain variation of photosensitive fibre is expressed as Δ ε_i(i=1,2).A left side known to the movement tendency line of sensor fibre in figure and swing rod Side sensor fibre tension, tension, the schematic diagram of inclination sensor measurement at this time be not as shown in Figure 4 for right side sensor fibre.If tilt angle For α, then the torque equilibrium equation of weight are as follows:

mgL₃sinα-SEΔε₁L₂θ=0 cos (1)

M is the quality of weight, L in formula₃It is swing rod total length, S is the cross-sectional area of sensor fibre, and E indicates sense light The Young's modulus of fiber material, L₂Expression upper end sensor fibre fixed point is at a distance from swing rod shaft, L₁Indicate that lower end sensor fibre is solid Fixed point is at a distance from swing rod.Formula (1) abbreviation is obtained:

And because are as follows:

Formula (3) are substituted into formula (2), available:

WhereinIn the case that tilt angle is smaller, strain variation linear ratio approximate with inclination angle The relationship of example.Maximum strain sensitivity in order to obtain takes θ=0 (L₂=L₁), the sensor fibre strain of the structure is sensitive at this time Degree isSensor fibre strain sensitivity withRelation curve such as Fig. 4, be in inverse proportion function relationship.

It is not excessiveTake too small, the biggish swing of amplitude and the first feelings can also occur in run-off the straight for swing rod pendulum Condition (L₂< L₁) discussion result it is the same, eventually result in tilt detection structure measurement inaccuracy.When tilt detection structure to the right When run-off the straight, situation is as the case where being tilted to the left, therefore two sensor fibres in left and right can individually detect the survey institute The inclination of generation.

In conclusion finally using L₂=L₁Structure design, according to the above theory analysis, and combine that sensor is practical to be made Weight shape, is finally set to cylindrical body, quality m=400g by the consideration in size and encapsulating structure in, and radius is 20mm takes the spacing L of upper end sensor fibre fixed point and swing rod shaft₂With lower end sensor fibre fixed point and swing rod the lowermost Distance L₁It is 25mm, takes the length L of swing rod₃For 115mm.

This is practical with advantages such as resistant to high temperatures, corrosion-resistant, impact resistance, the small coefficient of expansion and splendid processing characteristics, passes through Sensor fibre can carry out grade level highly sensitive detection, have reusable, light weight, high sensitivity, at low cost etc. Plurality of advantages.

Finally, it should be noted that the foregoing is merely this practical preferred embodiment, be not limited to it is practical, Although being described in detail with reference to the foregoing embodiments to originally practical, for those skilled in the art, still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features, Within all spirit and principle practical in sheet, it is practical to should be included in this for any modification, equivalent replacement, improvement and so on Within protection scope.

Claims (6)

1. a kind of novel optical fiber inclination sensor of stretching structure, including package casing (11) and pendulum (100)；Its feature exists In: package casing (11) outer top and outer bottom end are provided with steel disc (13), are provided with hollow out on the steel disc (13) Fixed mounting hole (1)；The first guide rail (3) being parallel to each other and the are disposed with inside the package casing (11) from top to bottom Two guide rails (7) are provided with two groups of centrosymmetric sliding blocks (4) on first guide rail (3), are arranged on second guide rail (7) There are two groups of centrosymmetric limiters (8)；The pendulum (100) is made of swing rod (6), rectangle steel part (9) and weight (10), institute The top bearing for stating swing rod (6) is mounted at the first guide rail (3) central axes, and the bottom end of the swing rod (6) is threadedly coupled rectangle steel Part (9), the rectangle steel part (9) are threadedly coupled weight (10), and weight (10) bottom end is fixedly connected with envelope by screw (12) Casing (11)；Rectangle steel part (9) two sides are flexibly connected limiter (8)；The sliding block (4) and rectangle steel part (9) it is upper Lower end is worn fine steel tube (5), the package casing (11) outside in be provided with two groups of sensor fibres (2) vertically downward, two groups The upper and lower side of the sensor fibre (2) is both secured in fine steel tube (5).

2. a kind of novel optical fiber inclination sensor of stretching structure according to claim 1, it is characterised in that: the sliding block (4), several equally distributed fixed points are provided on limiter (8) and rectangle steel part (9).

3. a kind of novel optical fiber inclination sensor of stretching structure according to claim 1, it is characterised in that: the encapsulation Shell (11) is cuboid, and the package casing (11) and weight (10) are all made of 304 stainless steels and are made.

4. a kind of novel optical fiber inclination sensor of stretching structure according to claim 1, it is characterised in that: the sensing Optical fiber (2) and fine steel tube (5) are glued using PY-51 type AB viscose glue.

5. a kind of novel optical fiber inclination sensor of stretching structure according to claim 1, it is characterised in that: the thin steel The length of pipe (5) is disposed as 20mm.

6. a kind of novel optical fiber inclination sensor of stretching structure according to claim 1, it is characterised in that: described in two groups The part of the force of sensor fibre (2) is isometric.