A Fiber Bragg Grating Acceleration Sensor
A technology of acceleration sensor and optical fiber grating, which is applied in the direction of measuring acceleration, velocity/acceleration/shock measurement, and acceleration measurement using inertial force, etc. problem, to achieve the effect of good consistency, increased sensitivity, and simple structure
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no. 1 example
[0032] The embodiment of the present invention provides a fiber grating acceleration sensor 10A, such as figure 1 shown. The fiber grating acceleration sensor 10A includes: a housing 11 , a mass block 14A placed in the housing 11 , a lever arm 13 , a fulcrum elastic piece 12 , a grating support 15 and a fiber grating 16 .
[0033]The housing 11 is used as a supporting structure of the fiber grating acceleration sensor 10A for fixing the fulcrum elastic piece 12 . The housing 11 can have various shapes, for example, it can be in the shape of "U", it can also be rectangular, and it can also be in the shape of trapezoid. In this embodiment, preferably, the housing 11 The shape can be rectangular. In this embodiment, preferably, the casing 11 may be made of a material with a small thermal expansion coefficient.
[0034] One end of the fulcrum elastic piece 12 is fixed at the inner bottom of the housing 11 , and the other end of the fulcrum elastic piece 12 is connected to one e...
no. 2 example
[0045] The fiber grating acceleration sensor 10B that present embodiment provides, as figure 2 As shown, compared with the first embodiment, the difference lies in that the mass block 14B has a different structure, and also includes: a first fiber exiting and crossing protection part 18, a second fiber exiting and crossing protection part 19, and a The first limit post 144 for the range of motion of the block 14B.
[0046] The mass block 14B is provided with a first hole 143 matched with the first limiting post 144, and the first limiting post 144 is placed in the first hole 143, and by adjusting the first limiting post 144 The height between the column 144 and the first inner wall of the housing 11 limits the displacement of the mass block 14B, so as to limit the offset of the mass block 14B.
[0047] Wherein, as an embodiment, the first hole 143 provided on the mass block 14B may be a through hole penetrating from the upper surface of the mass block 14B to the lower surfac...
no. 3 example
[0052] The fiber grating acceleration sensor 10C that present embodiment provides, as image 3 As shown, compared with the second embodiment, the difference lies in that the structure of the mass block 14A is different, and in addition, the first limiting column 144 is replaced by the second limiting column 112 provided on the inner wall of the housing 11 .
[0053] The inner side wall of the housing 11 is provided with a second hole 111 matched with the second limiting column 112, the second limiting column 112 is placed in the second hole 111, by adjusting the second The height between the two limit posts 112 and the mass block 14A limits the displacement of the mass block 14A, so as to limit the displacement of the mass block 14A. Wherein, the second hole 111 faces the lower surface of the mass block 14A, in order to accurately limit the movement range of the mass block 14A, a third screw thread can be provided in the second hole 111, and a third thread can be provided on t...
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