CN205139169U - Acceleration sensor based on fiber grating - Google Patents
Acceleration sensor based on fiber grating Download PDFInfo
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- CN205139169U CN205139169U CN201520900142.3U CN201520900142U CN205139169U CN 205139169 U CN205139169 U CN 205139169U CN 201520900142 U CN201520900142 U CN 201520900142U CN 205139169 U CN205139169 U CN 205139169U
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- 238000001514 detection method Methods 0.000 abstract description 3
- 239000013307 optical fiber Substances 0.000 description 3
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Abstract
一种基于光纤光栅的加速度传感器，包括光纤光栅、等强度梁、壳体和弹簧；光纤光栅加速度传感器的壳体的内侧壁上固定一等强度梁,等强度梁的另一端连接有质量块，两个光纤光栅固定于等强度梁上，质量块的下端连接有弹簧，弹簧的另一端固定于壳体的底部。利用光纤光栅进行加速度检测，免受电磁辐射的干扰，测量精度高，灵敏度可以调整，能消除温度对加速度测量的影响；具有结构简单、精度高、长期稳定性好、不受电磁辐射干扰的特点。
An acceleration sensor based on a fiber grating, comprising a fiber grating, an equal-intensity beam, a housing and a spring; a first-class intensity beam is fixed on the inner wall of the housing of the fiber-optic grating acceleration sensor, and the other end of the equal-intensity beam is connected with a mass block, The two fiber gratings are fixed on the equal strength beam, the lower end of the mass block is connected with a spring, and the other end of the spring is fixed at the bottom of the housing. Using fiber grating for acceleration detection, free from electromagnetic radiation interference, high measurement accuracy, adjustable sensitivity, can eliminate the influence of temperature on acceleration measurement; it has the characteristics of simple structure, high precision, good long-term stability, and no electromagnetic radiation interference .
Description
技术领域 technical field
本实用新型属于光纤传感检测技术领域，具体涉及一种基于光纤光栅的加速度传感器。 The utility model belongs to the technical field of optical fiber sensing and detection, in particular to an acceleration sensor based on optical fiber gratings.
背景技术 Background technique
在工程应用中，结构振动的测试可以反映出结构的性能，因此加速度传感器在实际的工程应用中非常重要。常用的加速度传感器是强度调制型、数字式的，这种传感器具有易受电磁辐射的干扰、长期稳定性差、防水性差等缺点，无法满足工程应用中长期灾害监测和恶劣工作环境的需要。 In engineering applications, the test of structural vibration can reflect the performance of the structure, so the acceleration sensor is very important in practical engineering applications. Commonly used acceleration sensors are intensity-modulated and digital. This kind of sensor has the disadvantages of being susceptible to electromagnetic radiation interference, poor long-term stability, and poor water resistance. It cannot meet the needs of long-term disaster monitoring and harsh working environments in engineering applications.
发明内容 Contents of the invention
为克服上述现有技术的不足，本实用新型的目的在于提供一种基于光纤光栅的加速度传感器，具有结构简单、精度高、长期稳定性好、不受电磁辐射干扰的特点。 In order to overcome the shortcomings of the above-mentioned prior art, the purpose of this utility model is to provide an acceleration sensor based on a fiber grating, which has the characteristics of simple structure, high precision, good long-term stability, and free from electromagnetic radiation interference.
为实现上述目的，本实用新型采用的技术方案是：一种基于光纤光栅的加速度传感器，包括有两个光纤光栅、等强度梁、壳体、质量块、弹簧；壳体的内侧壁上固定等强度梁；等强度梁的另一端连接有质量块；两个光纤光栅固定于等强度梁上；质量块的下端连接有弹簧，弹簧的另一端固定于壳体的底部。 In order to achieve the above object, the technical solution adopted by the utility model is: an acceleration sensor based on fiber gratings, including two fiber gratings, equal strength beams, housings, mass blocks, springs; Intensity beam; the other end of the constant strength beam is connected with a mass block; two fiber gratings are fixed on the equal strength beam; the lower end of the mass block is connected with a spring, and the other end of the spring is fixed at the bottom of the housing.
所述的等强度梁通过螺丝与壳体连接。 The equal-strength beams are connected with the shell through screws.
所述的弹簧通过螺丝与壳体连接。 The spring is connected with the housing through screws.
所述的质量块通过螺丝与等强度梁的自由端连接。 The mass block is connected with the free end of the equal-strength beam through screws.
所述的两个光纤光栅分别固定于等强度梁的上表面、下表面的中心线上。 The two fiber gratings are respectively fixed on the centerlines of the upper surface and the lower surface of the equal-strength beam.
与现有的加速度传感器相比，本实用新型的优点在于利用光纤光栅进行加速度检测，提出了一种新颖的光纤光栅加速度传感方法,本实用新型继承了悬臂梁光纤光栅传感的优点，操作简便、灵敏度高、动态范围大、光栅损害小,对加速度有良好的线性响应度，可以消除温度引起的交叉敏感效应，灵活的调整传感器的灵敏度；此外，本实用新型结构简单，抗电磁辐射的干扰，可以广泛的应用在结构工程等恶劣环境的检测中。 Compared with the existing acceleration sensor, the utility model has the advantage of using the fiber grating to detect the acceleration, and proposes a novel fiber grating acceleration sensing method. The utility model inherits the advantages of the cantilever beam fiber grating sensor, and the operation Simple, high sensitivity, large dynamic range, small grating damage, good linear response to acceleration, can eliminate the cross-sensitive effect caused by temperature, and flexibly adjust the sensitivity of the sensor; in addition, the utility model has a simple structure and is resistant to electromagnetic radiation. Interference can be widely used in the detection of harsh environments such as structural engineering.
光纤光栅由于其具有电绝缘、耐腐蚀、测量精度高、结构简单、体积小、重量轻、耗能少、灵敏度高等优点而成为一种新型的优良传感元件。由于其采用波长解码技术，避免了光源功率和损耗对测量的影响，适合长期监测；同时由于在同一根光纤上可以刻多个光栅，这样就可以实现分布式测量。 Fiber Bragg Grating has become a new type of excellent sensing element due to its advantages of electrical insulation, corrosion resistance, high measurement accuracy, simple structure, small size, light weight, low energy consumption, and high sensitivity. Because it adopts wavelength decoding technology, it avoids the influence of light source power and loss on measurement, and is suitable for long-term monitoring; at the same time, since multiple gratings can be engraved on the same optical fiber, distributed measurement can be realized.
附图说明 Description of drawings
图1为本实用新型的结构示意图。 Fig. 1 is the structural representation of the utility model.
具体实施方式 detailed description
下面结合附图对本实用新型进一步详细描述。 Below in conjunction with accompanying drawing, the utility model is described in further detail.
参见图1，一种基于光纤光栅的加速度传感器包括光纤光栅1和2、等强度梁3、壳体6、质量块4、弹簧5；所述的壳体6的内侧壁上固定所述的等强度梁3,所述的等强度梁3的另一端连接有所述的质量块4，所述的光纤光栅1和2固定于所述的等强度梁3的上下表面的中心线上，所述的质量块4的下端连接有所述的弹簧5，所述的弹簧5的另一端固定于所述的壳体6的底部。 Referring to Fig. 1, a kind of acceleration sensor based on fiber grating comprises fiber grating 1 and 2, constant strength beam 3, housing 6, mass block 4, spring 5; Intensity beam 3, the other end of the equal intensity beam 3 is connected with the mass block 4, the fiber gratings 1 and 2 are fixed on the center line of the upper and lower surfaces of the equal intensity beam 3, the The lower end of the mass block 4 is connected to the spring 5 , and the other end of the spring 5 is fixed to the bottom of the housing 6 .
所述的等强度梁3通过螺丝与壳体6连接。所述的弹簧5通过螺丝与壳体6连接。所述的质量块4通过螺丝与等强度梁3的自由端连接。所述的光纤光栅1、2分别固定于等强度梁3的上表面、下表面的中心线上。 The equal-strength beam 3 is connected with the housing 6 through screws. The spring 5 is connected with the housing 6 by screws. The mass block 4 is connected to the free end of the equal-strength beam 3 by screws. The fiber gratings 1 and 2 are respectively fixed on the centerlines of the upper surface and the lower surface of the equal strength beam 3 .
通过调节质量块4的质量和弹簧5的刚度来改变光纤光栅加速度传感器的灵敏度。 The sensitivity of the fiber grating acceleration sensor is changed by adjusting the quality of the mass block 4 and the stiffness of the spring 5 .
本实用新型的工作原理为： The working principle of the utility model is:
本加速度传感器固定在被测结构上，由于两个光纤光栅1、2贴在等强度梁的两侧面，处于相同的温度场，从而消除了温度对测量的影响。当被测结构振动而引起等强度梁3受迫振动时，两个光纤光栅1、2的中心波长分别沿相反方向漂移，则两个光纤光栅中心波长的差值的变化反映了被测结构的振动信息。 The acceleration sensor is fixed on the structure to be measured, and since the two fiber gratings 1 and 2 are pasted on both sides of the equal-intensity beam, they are in the same temperature field, thereby eliminating the influence of temperature on the measurement. When the measured structure vibrates and causes the equal-intensity beam 3 to vibrate, the center wavelengths of the two fiber gratings 1 and 2 drift in opposite directions, and the change of the difference between the center wavelengths of the two fiber gratings reflects the measured structure. vibration information.
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| CN201520900142.3U CN205139169U (en) | 2015-11-12 | 2015-11-12 | Acceleration sensor based on fiber grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804281A (en) * | 2021-08-03 | 2021-12-17 | 西安理工大学 | Sound wave vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804281A (en) * | 2021-08-03 | 2021-12-17 | 西安理工大学 | Sound wave vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle |
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