Optical fiber sensor based on long suspension fiber core structure in optical fiber and fiber core preparation method
An optical fiber sensor and fiber core technology, which is applied in the direction of using optical devices to transmit sensing components, cladding fibers, microstructure fibers, etc. Application scope and other issues, to achieve the effect of simple structure, simple production, and control of corrosion depth
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0030] like figure 1 Among them, the optical fiber sensor based on the long suspended fiber core in this embodiment is composed of a housing 1 , an air cladding 2 and a long suspended fiber core 3 .
[0031] The overall appearance shape of the housing 1 in this embodiment is a cylinder, which is directly formed by the corroded optical fiber cladding. The optical fiber housing 2 is a cavity formed by air in the housing. The overall shape of the long suspended fiber core 3 is a hexagonal prism in cross-section, which is formed by the suspended fiber core after corrosion. The diameter of the suspension core is 19um and the length is 3mm. The structure of the sensor in the invention is integrated, and the casing formed after corrosion protects the long suspended fiber core from being damaged. Preparation methods such as Figure 5 As shown, the optical fiber 2 is inserted into the injector 1, and the interface is sealed with AB glue.
Embodiment 2
[0033] In this embodiment, a fiber grating vibration sensor based on a long suspended fiber core is implemented. Based on the structure of the long-suspended fiber core sensor in Example 1, the design is as follows figure 2 The micro-nano fiber grating structure of the micro-cantilever shown. In this structure, a fiber Bragg grating (FBG) with a length of 3 mm is written on the core of a photonic crystal fiber by femtosecond laser direct writing. The long suspended core after corrosion can be used as a micro-cantilever beam, and the FBG on the independent core is used as the sensing element. When the sensor is placed in a vibrating environment, the fiber core will bend and cause the period of the FBG grating to change, which will cause the drift of the Bragg wavelength. The vibration signal can be sensed by monitoring the drift of the center wavelength.
Embodiment 3
[0035] In this embodiment, based on the structure in Embodiment 1, a reflective surface is added to the end face of the optical fiber to form an optical fiber vibration sensor with light intensity modulation. The structure is as follows Image 6 shown. The fiber end face 5 and the reflective face 4 form an FP cavity to realize intensity detection.
[0036] In order to verify the beneficial effect of the present invention, the inventor adopts the fiber grating vibration sensor based on the long suspended fiber core prepared by embodiment 2 to carry out laboratory research experiments, and the experimental conditions are as follows:
[0037] Experimental equipment: vibration table (WS-Z30-40); demodulation system, oscilloscope (SDS-1100X-E), tunable laser (CBDX1-1-C-HOI-FA), photodetector (KG-P-200M -A-FC).
[0038] 1. Frequency response experiment;
[0039] The present invention and the standard charge acceleration sensor (YD81D-V) are fixed on the vibrating table by screw r...
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| length | aaaaa | aaaaa |
| Sensitivity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More