Integrated two-dimensional fiber optic micro accelerometer based on four-core fiber optic
A micro-accelerometer, four-core fiber technology, applied in the direction of acceleration measurement using inertial force, cladding fiber, optical waveguide light guide, etc., can solve the problems of complex probe structure, unfavorable practical utilization, high cost of sensor head and demodulation , to achieve the effect of being conducive to miniaturization and simple production method
Inactive Publication Date: 2012-03-14
HARBIN ENG UNIV
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Problems solved by technology
The Chinese patent "Fiber Bragg Grating Three-dimensional Acceleration Vibration Sensor" (publication number CN 101210937A) and US Patent US 20060219009A1 use three gratings to realize three-dimensional acceleration measurement. The probe structure designed by this method is too complicated, which is not conducive to practical use
However, the change of the spectrum occupies a wide channel, and generally requires a spectrometer to demodulate, so the cost of the sensor head and demodulation is very high
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[0020] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0021] figure 1 It is the system structure diagram of the four-core accelerometer of the present invention, the light source 1 of 1310nm and the light source 2 of 1550nm are connected to the input end of circulator 4 after the wavelength division multiplexer 3, and the first output port of the circulator 4 is connected to the single-core single-mode optical fiber 5, the single-core optical fiber 5 is connected to the optical fiber sensing probe 6, and the 1310nm and 1550nm detectors 7 and 8 are connected to the other port of the circulator 4 through another wavelength division multiplexer 3.
[0022] The structure and manufacturing process of the optical fiber sensing probe 6 are described as follows:
[0023] Figure 4 A cross-sectional structure diagram of the four-core optical fiber of the present invention is given; the cores 20-23 are symmetrically distribu...
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The invention provides an integrated two-dimensional fiber optic micro accelerometer based on a four-core fiber optic, which is formed by connecting light sources the wave lengths of which are 1310nm and 1550nm respectively, a wavelength division multiplexer, a circulator, a single-core fiber optic, a fiber optic sensing probe and a dual detector, wherein the fiber optic sensing probe comprises afour-core fiber optic, an external shell, mass blocks and a support, wherein each fiber core is carved with fiber optic gratings serving as reflectors; resonance wavelengths of the two orthotropic fiber optic grating pairs are 1310nm and 1550nm respectively; the single-core fiber optic and the four-core fiber optic are connected by utilizing a fiber optic coupler; the single-core fiber optic and the shell are rigidly connected; the mass blocks and the four-core fiber optic are connected and fixed; the mass blocks are fixed at the positions of the four fiber optic gratings; and the four-core fiber optic is fixed with the external shell by the support. The invention is beneficial to the miniaturization and the integration of sensors, can realize the acceleration measurement in the two-dimensional direction, has simple, convenient and feasible manufacture method and can achieve the goal of temperature compensation.
Description
technical field [0001] The invention relates to an optical fiber accelerometer, in particular to an integrated two-dimensional optical fiber micro accelerometer based on a four-core optical fiber. Background technique [0002] The accelerometer is an important sensor commonly used in shock and vibration measurement of ordnance, vehicles, ships, etc., earthquake detection, inertial navigation and guidance systems. The inertial force or displacement generated during motion can be measured to measure the corresponding acceleration. Traditional accelerometers use electromechanical methods to measure the inertial force or displacement of the mass, while fiber optic accelerometers use fiber optic sensing technology to measure the inertial force or displacement of the mass. Compared with the former, the latter not only has the unique advantages of anti-electromagnetic interference, but also has small size and light weight, wide dynamic range, high precision, can work in harsh envi...
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IPC IPC(8): G01P15/03G02B6/02
Inventor 苑立波关春颖杨军
Owner HARBIN ENG UNIV