CN210774017U

CN210774017U - Differential pressure type static force leveling device based on fiber grating

Info

Publication number: CN210774017U
Application number: CN201921497031.7U
Authority: CN
Inventors: 胡长华
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-06-16
Anticipated expiration: 2029-09-10

Abstract

A differential pressure type static level device based on fiber bragg gratings measures the pressure difference between a measuring point and a reference point through a fiber bragg grating sensor, represents the static level value of each measuring point, and can eliminate the influence of environmental conditions such as temperature and the like on the liquid level through the pressure difference. The device has small volume, simple structure and simple and convenient operation, and is suitable for static leveling measurement of various structures.

Description

Differential pressure type static force leveling device based on fiber grating

The technical field is as follows:

the utility model relates to a hydrostatic level device, specifically speaking are differential hydrostatic level device based on fiber grating.

Background art:

the static leveling measurement is widely applied to a plurality of practical engineering structures such as civil engineering, bridges and tunnels, and can be used for monitoring vertical displacement and inclination through the static leveling. Compared with the traditional electrical measurement method, the fiber grating measurement method has the characteristics of long distance and no electricity, and is very convenient to use in large-scale structure measurement. Patent application

CN101408463A and CN204788355U propose fiber grating static levels, which are based on the liquid level principle, and are composed of buoy structures, and have large volume, complex internal structure, and small measuring range (below 600 mm), and if they are installed in a small-diameter circular tube or measuring range is several meters, they are obviously impossible to measure.

The utility model has the following contents:

an object of the utility model is to provide a differential hydrostatic level device based on fiber grating to prior art not enough. The device adopts the pressure difference principle, and is small in size, simple in structure and simple and convenient to operate.

The technical scheme of the utility model:

the utility model provides a differential hydrostatic level device based on fiber grating which characterized in that: the static box body is provided with an elastic sheet on the upper cover, the optical fiber grating sensors are attached to the outside of the sheet, the two ends of the box body are provided with liquid pipe joints, during measurement, a liquid storage cylinder is arranged at a reference position, the outlet at the lower end of the static box body is connected with one static box body, the other static box body is arranged at a required measuring point, all the static box bodies are connected in series through a pipeline, all the optical fiber grating sensors are connected in series to an optical fiber grating demodulator, and the static level data at the measuring point can be obtained by measuring the pressure difference between each measuring point and the reference point.

The utility model has the advantages that: compared with the prior art, the utility model relates to a differential hydrostatic level device based on fiber grating, it is small, simple structure, easy and simple to handle.

Description of the drawings:

fig. 1 is a schematic structural diagram of the present invention.

The labels in the figure are: the device comprises a liquid storage cylinder 1, a fiber grating demodulator 2, a static box 3, a fiber grating sensor 4 and a pipeline 5.

The specific implementation mode is as follows:

as shown in fig. 1, a differential pressure type static leveling device based on fiber grating. The device comprises a liquid storage cylinder 1, a fiber bragg grating demodulator 2, a static box 3, a fiber bragg grating sensor 4 and a pipeline 5.

The liquid storage cylinder 1 is arranged at a stable position, a static box body 3 is connected to a place near the liquid storage cylinder by a pipeline 5 to be used as a reference point, other static box bodies 3 are arranged at other needed places to be used as measuring points, the static box bodies 3 are connected by the pipeline 5, and the fiber grating sensors 4 on the static box bodies 3 are connected to the fiber grating demodulator 2 in series by optical fibers.

The working principle of the differential pressure type static leveling device based on the fiber bragg grating is as follows: the fiber grating demodulator measures pressure data of the fiber grating sensor at each position, the difference between the pressure at the measuring point and the pressure at the reference point represents a static level value, and the liquid level influence generated by environmental conditions such as temperature and the like can be eliminated through differential pressure.

Claims

1. The utility model provides a differential hydrostatic level device based on fiber grating, characterized by: the liquid storage cylinder (1) is installed at a stable position, a static box body (3) is connected to a place near the liquid storage cylinder through a pipeline (5) to serve as a datum point, other static box bodies (3) are installed at other needed positions to serve as measuring points, the static box bodies (3) are connected through the pipeline (5), and the fiber grating sensors (4) on the static box bodies (3) are connected to the fiber grating demodulator (2) in series through optical fibers.