阅读说明：本技术 一种基于横向力的大量程光纤光栅加速度计 (Wide-range fiber grating accelerometer based on transverse force ) 是由 田娟 赵义虎 李瑜庆 李阔 于 2019-12-18 设计创作，主要内容包括：本发明公开了一种基于横向力的大量程光纤光栅加速度计,包括传感器壳体,其包括矩形空腔结构,所述传感器壳体内部封装有阻尼液；光纤,其纵向贯穿传感器壳体,所述光纤上设置有光栅；惯性原件,其与光纤同轴设置,且对称设置在传感器壳体中心；以及纵向限位装置,其设置在传感器壳体内部,用于限定惯性原件纵向移动。本发明通过在传感器壳体内封装一定系数的阻尼液,极大的提高了光纤光栅加速度计的量程,有效的避免了因超过量程而出现的失真,使得该装置能够适用于不同场合的测量,提高了光纤光栅加速度计的适应性。(The invention discloses a wide-range fiber grating accelerometer based on transverse force, which comprises a sensor shell, a sensor body and a sensor body, wherein the sensor shell comprises a rectangular cavity structure; the optical fiber longitudinally penetrates through the sensor shell, and a grating is arranged on the optical fiber; the inertia element is coaxially arranged with the optical fiber and symmetrically arranged at the center of the sensor shell; and the longitudinal limiting device is arranged inside the sensor shell and used for limiting the longitudinal movement of the inertia element. According to the invention, the damping liquid with a certain coefficient is packaged in the sensor shell, so that the measuring range of the fiber grating accelerometer is greatly improved, the distortion caused by exceeding the measuring range is effectively avoided, the device can be suitable for measurement in different occasions, and the adaptability of the fiber grating accelerometer is improved.)

1. A wide-range fiber grating accelerometer based on transverse force is characterized in that: comprises that

The sensor comprises a sensor shell (1) and a sensor body, wherein the sensor shell (1) comprises a rectangular cavity structure, and damping liquid (3) is packaged in the sensor shell (1);

the optical fiber (2) longitudinally penetrates through the sensor shell (1), and a grating is arranged on the optical fiber (2);

the inertia element (4) is coaxially arranged with the optical fiber (2) and symmetrically arranged at the center of the sensor shell (1); and

and the longitudinal limiting device (5) is arranged inside the sensor shell (1) and is used for limiting the longitudinal movement of the inertia element (4).

2. A wide range fiber grating accelerometer based on lateral forces as claimed in claim 1, wherein: the inertia element (4) comprises a stainless steel cylinder with a diameter of 10mm, a height of 10mm and a weight of 5.3 g.

3. A wide range fiber grating accelerometer based on lateral forces as claimed in claim 1, wherein: the damping fluid (3) comprises a resistance fluid having a viscosity of 10000 Cst.

4. A wide range fiber grating accelerometer based on lateral forces as claimed in claim 1, wherein: the longitudinal limiting device (5) comprises limiting blocks (51), the limiting blocks (51) are movably arranged on the sensor shell (1) through sliding grooves, driving shafts (52) are arranged between the limiting blocks (51), threads with opposite rotation directions are arranged at two ends of the driving shafts (52), first bevel gears (53) are arranged on the driving shafts (52), the first bevel gears (53) are meshed with second bevel gears (54) arranged on adjusting shafts (55), and the other ends of the adjusting shafts (55) extend to the outside of the sensor shell (1).

Technical Field

The invention relates to the technical field of fiber grating accelerometer equipment, in particular to a wide-range fiber grating accelerometer based on transverse force.

Background

The fiber grating acceleration sensor has important application in many fields, such as real-time monitoring in aerospace, large electromechanical equipment, bridge structures, oil exploration, ships, earthquakes and the like. The fiber grating acceleration sensor enables the fiber grating to deform through the movement of the inertia original piece along with the object to be measured, senses the size of the parameter to be measured through the drift amount of the center wavelength of the fiber grating, monitors the vibration condition of the object, judges the working state, timely eliminates the fault, and avoids major accidents.

The patent "a method of changing the strain of a string using a lateral force and its application in a fiber grating accelerometer" (patent No. ZL201310415482.2, inventor: li kuang) proposes a more sensitive fiber grating accelerometer, which is based on a lateral force and has a range of only 1g in the direction of gravity because in the direction of gravity, if the acceleration of gravity is 0, the inertial element will not be subjected to gravity and will not pull the fiber, while the position of the fiber is horizontal. However, the actual situation is an acceleration of 1g in the direction of gravity. Therefore, when the amplitude of the acceleration of the applied positive sine wave reaches 1g, the optical fiber reaches the level when the inertia element moves to the highest position. At this time, the length of the optical fiber is the shortest, the return wavelength of the fiber grating is also the smallest, and the corresponding acceleration is also the smallest, which is-1 g. When the amplitude of the acceleration exceeds 1g, the highest position moved by the inertia element is higher than the position where the optical fiber is originally made horizontal, the length of the optical fiber is not the shortest, the return wavelength is not the smallest, but the corresponding acceleration is the smallest, and the distortion occurs.

Disclosure of Invention

The present invention is directed to a wide-range fiber grating accelerometer based on lateral force, so as to solve the above problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a wide-range fiber grating accelerometer based on transverse force comprises

The sensor comprises a sensor shell, a sensor cover and a sensor, wherein the sensor shell comprises a rectangular cavity structure, and damping liquid is packaged in the sensor shell;

the optical fiber longitudinally penetrates through the sensor shell, and a grating is arranged on the optical fiber;

the inertia element is coaxially arranged with the optical fiber and symmetrically arranged at the center of the sensor shell; and

and the longitudinal limiting device is arranged inside the sensor shell and used for limiting the longitudinal movement of the inertia element.

Preferably, the inertia element comprises a stainless steel cylinder having a diameter of 10mm, a height of 10mm and a weight of 5.3 g.

Preferably, the damping liquid comprises a resistance liquid having a viscosity of 10000 Cst.

Preferably, the longitudinal limiting device comprises limiting blocks, the limiting blocks are movably arranged on the sensor shell through sliding grooves, driving shafts are arranged between the limiting blocks, threads with opposite rotation directions are arranged at two ends of the driving shafts, first bevel gears are arranged on the driving shafts and meshed with second bevel gears arranged on the adjusting shafts, and the other ends of the adjusting shafts extend to the outside of the sensor shell.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the damping liquid with a certain coefficient is packaged in the sensor shell, so that the measuring range of the fiber grating accelerometer is greatly improved, the distortion caused by exceeding the measuring range is effectively avoided, the device can be suitable for measurement in different occasions, and the adaptability of the fiber grating accelerometer is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the longitudinal limiting device of the present invention.

In the figure: the sensor comprises a sensor shell 1, an optical fiber 2, a damping fluid 3, an inertia element 4, a longitudinal limiting device 5, a limiting block 51, a driving shaft 52, a first bevel gear 53, a second bevel gear 54 and an adjusting shaft 55.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution:

a wide-range fiber grating accelerometer based on transverse force comprises

The sensor comprises a sensor shell 1, a damping liquid 3 is packaged in the sensor shell 1, the damping liquid 3 comprises a resistance liquid with the viscosity of 10000Cst, and the arrangement of the damping liquid 3 can effectively improve the measuring range of the sensor and avoid distortion caused by exceeding the measuring range;

the optical fiber 2 longitudinally penetrates through the sensor shell 1, and a grating is arranged on the optical fiber 2;

the inertia original piece 4 is coaxially arranged with the optical fiber 2 and symmetrically arranged at the center of the sensor shell 1, the inertia original piece 4 comprises a stainless steel cylinder with the diameter of 10mm, the height of 10mm and the weight of 5.3g, the sensor is arranged on a measured object, the acceleration of the measured object is transmitted to the inertia original piece 4, the optical fiber 2 is deformed by the movement of the inertia original piece 4, the drift amount of the central wavelength of the fiber grating is changed, and the acceleration is obtained by measuring the drift amount; and

and a longitudinal limiting device 5 arranged inside the sensor housing 1 and used for limiting the longitudinal movement of the inertia element 4.

The longitudinal limiting device 5 comprises limiting blocks 51, the limiting blocks 51 are movably arranged on the sensor shell 1 through sliding grooves, driving shafts 52 are arranged between the limiting blocks 51, threads with opposite rotation directions are arranged at two ends of the driving shafts 52, first bevel gears 53 are arranged on the driving shafts 52, the first bevel gears 53 are meshed with second bevel gears 54 arranged on adjusting shafts 55, and the other ends of the adjusting shafts 55 extend to the outside of the sensor shell 1. Through rotatory regulating shaft 55, under the effect of first bevel gear 53 and second bevel gear 54, linkage drive shaft 52 rotates, because drive shaft 52 both ends are connected with stopper 51 through the opposite screw of turning round for stopper 51 can be close to or keep away from inertia original paper 4 along the spout is synchronous, realizes the fore-and-aft spacing to inertia original paper 4.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.