A Two-Dimensional Vibration Sensor Based on Twisted Fiber Bragg Grating
A two-dimensional vibration and torsion optical fiber technology, which is applied in the direction of instruments, measuring devices, and wave/particle radiation, can solve the problems of inaccurate total acceleration and different sensitivity, and achieve the effects of accurate acceleration, improved sensitivity, and improved precision
Inactive Publication Date: 2020-05-05
WUHAN UNIV OF TECH
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Problems solved by technology
[0003] Most fiber grating two-dimensional vibration sensors obtain two-dimensional acceleration through the acceleration vector synthesis method of two perpendicular measurement directions, but many sensors have different sensitivities in the two measurement directions, which will make the synthesized total acceleration not accurate enough
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[0021] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.
[0022] Such as figure 1 As shown, a two-dimensional vibration sensor based on twisted fiber gratings includes a base 1 for fixing on the object to be measured. Two bearing seats 5 are installed on the base 1, and the two bearing seats 5 are respectively matched through bearings. There is a pair of parallel torsion bars 3, one end of the two torsion bars 3 is fixed on the base 1, and the other end protrudes from the bearing seat 5, the two torsion bars 3 correspond to two long-period fiber gratings 10 respectively, and the long-period fiber gratings 10 They are respectively fixed on the extension end of the corresponding torsion bar 3 and the base 1 and are concentric with the corresponding torsion bar 3. The pigtails are drawn out through the through hole on the base 1. The extension end of a torsion bar 3 is provided with a A mass block 8 perpendi...
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The invention relates to a two-dimensional vibration sensor based on torsional fiber gratings. The two-dimensional vibration sensor includes a base fixed on a tested object. Two bearing seats are installed on the base. The two bearing seats are respectively matched with a pair of parallel torsion bars through bearings. One end of each torsion bar is fixed to the base, and the other end extends out of the corresponding bearing seat. The two torsion bars respectively correspond to two long-period fiber gratings. The long-period fiber gratings are respectively fixed to the extending ends of the corresponding torsion bars and the base, and are concentric with the corresponding torsion bars. A tail fiber is led out via a through hole of the base. At the extending end of one torsion bar, a horizontal mass block perpendicular to the torsion bar is arranged. At the extending end of the other torsion bar, a vertical mass block perpendicular to the torsion bar is arranged. The sensor obtains measurement signals based on the torsion characteristic of the long-period fiber gratings. The sensitivity and the measurement accuracy are improved.
Description
technical field [0001] The invention belongs to the field of vibration measurement, in particular to a two-dimensional vibration sensor based on twisted optical fiber gratings. Background technique [0002] In recent years, fiber grating sensors have developed rapidly with the advantages of lightness, safety, strong anti-electromagnetic interference, high temperature resistance and corrosion resistance. At present, the common fiber grating two-dimensional vibration acceleration sensors are mainly the following two types, one is to use the structure such as diaphragm, elastic sheet or spring to bear the external force brought by the acceleration, and the acceleration is measured by measuring the strain of the elastic structure through the fiber grating; the other is to directly The fiber grating is used as the elastic body to bear the inertial force caused by the acceleration, and the acceleration is obtained by the wavelength shift of the grating. In these two types of fibe...
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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 魏莉王兢兢
Owner WUHAN UNIV OF TECH