阅读说明：本技术 光纤光栅流速流向传感器 (Fiber grating flow velocity and direction sensor ) 是由 唐浩冕 梁磊 许儒泉 张健 王宁 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种光纤光栅流速流向传感器,包括圆柱形外壳,外壳的顶部安装有与内部连通的线缆管道,外壳的内壁安装有支座,支座环绕外壳内壁一圈设置,支座上固定有圆弧铰链的一端,圆弧铰链的两端之间粘附有四根相互平行的应变光栅,圆弧铰链的另一端接有半圆球底座,半圆球底座与传导棒相接,传导棒通过外壳底部的通孔伸到外部,且传导棒末端连接有圆柱形探头。本专利能够实现水流方向和流速的同时测量,具备测量响应快、灵敏度高、抗干扰能力强等优点。(The invention discloses a fiber bragg grating flow velocity and flow direction sensor which comprises a cylindrical shell, wherein a cable pipeline communicated with the inside is installed at the top of the shell, a support is installed on the inner wall of the shell, the support is arranged around the inner wall of the shell in a circle, one end of an arc hinge is fixed on the support, four parallel strain gratings are adhered between two ends of the arc hinge, the other end of the arc hinge is connected with a semi-spherical base, the semi-spherical base is connected with a conduction rod, the conduction rod extends to the outside through a through hole at the bottom of the shell, and the tail end of the conduction rod is connected with a cylindrical probe. This patent can realize the simultaneous measurement of rivers direction and velocity of flow, possesses advantages such as measurement response is fast, sensitivity is high, the interference killing feature is strong.)

1. A fiber grating flow velocity and direction sensor is characterized in that: the optical fiber cable comprises a shell, an arc hinge, an optical fiber assembly and a conduction assembly;

the cable pipeline is arranged in the center of the top of the shell and is coaxial with the shell, and a support is arranged on the inner side wall of the shell and surrounds the inner wall of the shell for a circle;

the optical fiber assembly is provided with a Bragg grating, the upper end and the lower end of the Bragg grating are connected with optical fibers, and the optical fiber assembly is arranged around the circular arc hinge in a surrounding manner; the conducting assembly is connected to the lower end of the arc hinge, and the conducting assembly extends to the outside of the shell.

2. The fiber grating flow sensor of claim 1, wherein: the two ends of the arc hinge are respectively provided with four placing holes, and the placing holes at the two ends of the arc hinge are in one-to-one correspondence with four straight lines.

3. The fiber grating flow sensor of claim 2, wherein: the optical fibers are respectively adhered to the placing holes at the two ends of the circular arc hinge, and the Bragg grating is positioned between the placing holes at the two ends of the circular arc hinge.

4. The fiber grating flow sensor of claim 1, wherein: the bottom of the shell is provided with threads, and the shell is provided with an end cover which is screwed on the shell through the threads.

5. The fiber grating flow sensor of claim 4, wherein: the conducting assembly comprises a hemispherical base, the plane of the hemispherical base is fixed at the lower end of the arc hinge, the spherical surface of the hemispherical base is connected with a conducting rod, and a silica gel probe is installed at the tail end of the conducting rod.

6. The fiber grating flow sensor of claim 5, wherein: the end cover is provided with a conduction rod through hole, and the conduction rod penetrates through the conduction rod through hole.

7. The fiber grating flow sensor of claim 1, wherein: the optical fiber is protected by the silicone rubber sleeve and the armored optical cable sleeve to penetrate through the cable pipeline.

8. The fiber grating flow sensor of claim 1, wherein: the optical fiber is connected with the optical fiber coupler through an optical cable, the optical fiber coupler is connected with the optical fiber light source and the optical fiber demodulator, and the optical fiber demodulator is connected with the computer.

[ technical field ] A method for producing a semiconductor device

The invention mainly relates to a fiber bragg grating flow velocity and direction sensor.

[ background of the invention ]

The fiber grating is a diffraction grating formed by axially and periodically modulating the refractive index of the fiber core, and the resonance wavelength of the fiber grating can be changed due to the change of parameters such as strain, temperature, pressure, displacement, flow and the like. The sensors for measuring the flow velocity of water flow are various, such as an ultrasonic flow velocity sensor, a Doppler flow velocity sensor and a thermal flow velocity sensor, the flow velocity sensors are easy to be subjected to electromagnetic interference and cannot measure the flow velocity of fluid in a complex environment, and the fiber grating sensor has the advantages of small volume, quick response, difficulty in being subjected to external electromagnetic interference and the like, so that the fiber grating flow velocity sensor can realize long-term monitoring in the complex environment.

The traditional optical fiber flow velocity sensor is only limited to measuring the flow velocity of fluid in a pipeline and cannot accurately measure the water flow direction in complex environments such as a navigation channel, a ship lock, a water tank and the like.

[ summary of the invention ]

The invention provides a fiber grating flow velocity and flow sensor, which aims to solve the problem that the fiber grating flow velocity sensor in the prior art cannot accurately measure the fluid state in a complex environment, and adopts the following technical scheme:

a fiber bragg grating flow velocity and direction sensor comprises a shell, an arc hinge, a fiber assembly and a conduction assembly;

the cable pipeline is arranged in the center of the top of the shell and is coaxial with the shell, and a support is arranged on the inner side wall of the shell and surrounds the inner wall of the shell for a circle;

the optical fiber assembly is provided with a Bragg grating, the upper end and the lower end of the Bragg grating are connected with optical fibers, and the optical fiber assembly is arranged around the circular arc hinge in a surrounding manner; the conducting assembly is connected to the lower end of the arc hinge, and the conducting assembly extends to the outside of the shell.

Preferably, four placing holes are respectively formed in two ends of the arc hinge, and the placing holes in the two ends of the arc hinge are located on four straight lines in a one-to-one correspondence mode.

Preferably, the optical fibers are respectively adhered in the placing holes at the two ends of the circular arc hinge, and the bragg grating is positioned between the placing holes at the two ends of the circular arc hinge.

Preferably, the bottom of the housing is threaded and the housing is provided with an end cap screwed onto the housing.

Preferably, the conduction subassembly includes the hemisphere base, the plane of hemisphere base is fixed circular arc hinge lower extreme, the sphere of hemisphere base is connected with the conduction stick, the silica gel probe is installed to the conduction stick end.

Preferably, the end cover is provided with a conduction rod through hole, and the conduction rod penetrates through the conduction rod through hole.

Preferably, the optical fibre is protected through the cable duct by a silicone sleeve and an armoured cable jacket.

Preferably, the optical fiber is connected with the optical fiber coupler through an optical cable, the optical fiber coupler is connected with the optical fiber light source and the optical fiber demodulator, and the optical fiber demodulator is connected with the computer.

Compared with the background technology, the invention has the following beneficial effects:

by adopting the scheme, the silica gel probe can generate a small displacement under the influence of water flow in water, the direction of the displacement is consistent with the direction of the water flow, and the size of the displacement is related to the speed of the water flow. When the speed of rivers changes, the probe can remove along the rivers direction, and the displacement of probe drives the skew of conduction stick to lead to the deformation of circular arc hinge, through with four strain grating arrays around the circular arc hinge, with the change of four grating wavelengths, perception circular arc hinge is met an emergency and is met an emergency in the branch strain of two mutual orthogonal directions, obtains the size and the direction of meeting an emergency, indirect measurement velocity of flow size and direction. The invention has the advantages of high sensitivity, quick response, low cost, no electromagnetic interference and the like, can accurately measure the change of the water flow speed and direction in real time, and is used for monitoring the water flow state of the complex water body environment.

[ description of the drawings ]

FIG. 1 is a cross-sectional view of a fiber grating flow sensor according to a preferred embodiment of the present invention;

FIG. 2 is a schematic perspective view of a fiber grating flow velocity and direction sensor according to a preferred embodiment of the present invention;

fig. 3 is a schematic perspective view of the fiber grating water flow velocity and direction sensor according to the preferred embodiment of the present invention.

[ detailed description ] embodiments

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

The technical scheme and the beneficial effects of the invention are clearer and clearer by further describing the specific embodiment of the invention with the accompanying drawings of the specification. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention.

The preferred embodiment provided by the present invention: as shown in fig. 1 to 3, the fiber grating flow velocity/direction sensor includes: the optical fiber cable comprises a shell 1, a circular arc hinge 2, an optical fiber component 3 and a conducting component 4.

Cable pipeline 11 is installed at 1 top center of shell, and cable pipeline 11 and the coaxial setting of shell 1, support 12 is installed to the inside lateral wall of shell 1, and support 12 encircles the shell inner wall round, 1 bottom of shell is equipped with the screw thread and is used for connecting end cover 13, 2 one ends of circular arc hinge are fixed on support 12, the unsettled placing of the other end, 2 both ends of circular arc hinge are equipped with four upper portion place hole 21 and four lower part place hole 22 respectively, fiber component 3 installs Bragg grating 32, Bragg grating 32 upper end and lower extreme are connected with optic fibre 31, fiber component 3 encircles and arranges around circular arc hinge 2, conduction subassembly 4 is connected 2 lower extremes of circular arc hinge, and conduction subassembly 4 passes end cover 13 stretches the outside of shell 1.

In the fiber grating flow velocity and direction sensor, the upper portion placing hole 21 corresponds to the lower portion placing hole 22, the optical fibers at two ends of the bragg grating 32 are respectively adhered to the upper portion placing hole 21 and the lower portion placing hole 22, and the bragg grating is located between the upper portion placing hole 21 and the lower portion placing hole 22, so that the fiber grating can be prevented from being influenced by other stresses, and the precision and the service life of the fiber sensor are improved.

Conduction subassembly 4 is equipped with hemisphere base 41 the plane of hemisphere base 41 is fixed 2 lower extremes of circular arc hinge, the sphere of hemisphere base 41 is connected with conduction stick 42, silica gel probe 43 is installed to conduction stick 42 end, and the change of probe response rivers state passes to inside through the conduction stick, can adjust the sensitivity of sensor through the length that changes the conduction stick.

The center of the end cover 13 is provided with a conduction rod through hole, the conduction rod 42 penetrates through the conduction rod through hole, the conduction rod is limited by the conduction rod through hole, the measurement range of the sensor is controlled by adjusting the radius of the through hole, and the phenomenon that the internal structure of the sensor is damaged due to the fact that the measured water flow speed is too high is prevented

The optical fiber penetrates through the cable pipeline under the protection of the silicon rubber sleeve pipe sleeve and the armored optical cable sleeve, and is connected with the optical fiber coupler through the optical cable, the optical fiber coupler is connected with the optical fiber light source and the optical fiber demodulator, and the optical fiber demodulator is connected with the computer. The demodulator demodulates the wavelength change of the optical signal and displays the wavelength change on a computer, and the change of the flow speed and the flow direction of the measured fluid can be reflected.

When the flow velocity is measured, the probe can move along the water flow direction, the displacement of the probe drives the deflection of the conduction rod, so that the deformation of the arc hinge is caused, the four strain gratings are arrayed around the arc hinge, the partial strain of the arc hinge in two mutually orthogonal directions is sensed by using the wavelength change of the four strain gratings, the strain magnitude and direction are obtained, and the flow velocity magnitude and direction are indirectly measured. The invention has the advantages of high sensitivity, quick response, low cost, no electromagnetic interference and the like, can accurately measure the change of the water flow speed and direction in real time, and is used for monitoring the water flow state of the complex water body environment.

In the description of the specification, reference to the description of "one embodiment", "preferably", "an example", "a specific example" or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention, and schematic representations of the terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

With the above structure and principle in mind, those skilled in the art should understand that the present invention is not limited to the above embodiments, and modifications and substitutions based on the known technology in the field are within the scope of the present invention, which should be limited by the claims.