Novel fiber grating two-dimensional tilting angle sensor

Abstract

The invention relates to a novel fiber sensor which is used for measuring the size and the direction of a tilting angle and is manufactured by utilizing strain effect of a fiber grating and wavelength measuring technology based on the prior fiber Bragg grating. The system consists of a pedestal (1), a supporting column (2), a top disc (3), fiber gratings (4), a weight (5) and fibers (6). When the sensor tilts for a certain angle, the sensor causes three fiber gratings to have different stresses and utilizes the drifting amount of central reflective wavelength of the fiber grating measured by the wavelength measuring technology to reversely calculate the size and the direction of the tilting angle. A common fiber grating is sensitive to a temperature; and as the novel fiber sensor uses the three fiber gratings positioned in the same environment and the consistent drifting amount of the central wavelength caused by the temperature can be compensated in the angle analyzing and calculating process, the novel fiber sensor is insensitive to the temperature when measuring the tilting angle. The novel fiber sensor has a simple principle, has the characteristics of light mass, anticorrosion, electromagnetic interference resistance, safe and reliable use and the like, also has the unique advantages of small size, high sensitivity, easy coupling with fiber, small consumption, integration of sensing and transmission and easy wavelength division multiplex and the like and is convenient to realize; therefore, the novel fiber sensor can be used as a tilting angle sensor of various fields.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to the application of optical fiber gratings and the technology for measuring tilt angles. Background technique [0002] In daily life, we often need to measure whether some equipment, buildings, etc. are tilted during construction or installation. When the inclination angle is relatively large, we can simply use ready-made tools such as a protractor to make a rough measurement, but when the inclination angle is small (such as less than 5°), it is difficult to use this method to achieve a more accurate measurement. Later, people proposed some sensors such as measuring the tilt angle by capacitance change, but the electrical signal is easily subject to electromagnetic interference, so its scope of application is greatly limited, and its measurement accuracy is not high, and its structure is relatively complicated. [0003] Fiber Bragg grating is a basic fib...

AI Technical Summary

Problems solved by technology

However, the proposed scheme needs to stick the fiber grating on the surface of the cantilever beam or fix it on the steel frame. The force generated by the tilt needs to be transmitted to the fiber grating through the intermediate device, and the mechanical contact, friction and rotation of the device will bring Large error, so the rigid connection and stability requirements of the device are very high

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