Abstract
In view of problems existing in the detection of the traditional hydraulic system, such as the large volume of sensor and the low measurement accuracy, a new one-piece target type flow sensor is designed and researched based on fiber Bragg grating (FBG). A compact structure is designed, which is convenient to be dismantled, processed, and installed, based on the analysis of the principle of FBG and the structure of target type flow sensor. The force of target put in fluid flow is turned into the FBG wavelength drift, with a corresponding relationship. The problem on the cross sensitivities of the temperature and strain is solved effectively by using double FBG symmetrically pasted on the both surfaces of the cantilever. The impact on the fluid state is analyzed through simulation in the software FLUENT, and the results show that the impact was smaller than that of the traditional structure. The results of experiments in the hydraulic system show that there is a good linear relationship between the change in the dual FBG central wavelength and mass loading on the target sheet has a good linear relationship, and the sensitivity is twice that of a single FBG sensitivity.
Highlights
In the industrial production process and automation control field, the flow is one of the parameters being detected and controlled
Fiber Bragg grating (FBG) flow sensor is a new type of sensing technology developed in recent 20 years [5, 6], and its principle is that the central Bragg reflected wavelength is sensitive to physical quantities of the external physics, through the special package and structure design to realize measurement of various parameters [7, 8]
We design a construction which combines target sheet and sensitive element into one product based on the sensing principle of the FBG target type flowmeter
Summary
Photonic Sensors flow parameters, such as high precision and multiple point detection requirements. Yu et al [11], Wang et al [12], Wang et al [13], and others have applied FBG in the traditional target flowmeter and have realized the accurate and quick measurement of flow by FBG based on the circular target and a cantilever beam structure, but its structure is complex and not easy to be installed and sealed, and it fails to give full play to the advantages of FBG sensor. According to the above background, this paper proposes a set of choke target slices and sensitive elements in one of equal strength cantilever structures, on the basis of analyzing the measuring principle, and after the structure design and material processing, the feasibility of this structure is verified by experiment, and the sensor is proved sensitive and reliable
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