CN210833446U - Temperature self-compensation fiber grating strain sensor for monitoring wind power blade - Google Patents
Temperature self-compensation fiber grating strain sensor for monitoring wind power blade Download PDFInfo
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- CN210833446U CN210833446U CN201922182679.1U CN201922182679U CN210833446U CN 210833446 U CN210833446 U CN 210833446U CN 201922182679 U CN201922182679 U CN 201922182679U CN 210833446 U CN210833446 U CN 210833446U
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Abstract
The utility model discloses a temperature self compensating fiber grating strain transducer for wind-powered electricity generation blade monitoring, including transmission optical fiber, protecting sheathing, combined material basement, strain grating and temperature grating, the protecting sheathing encapsulation cladding is at combined material basement top, form the holding chamber between protecting sheathing and the combined material basement, strain grating and temperature grating establish respectively on the transmission optical fiber that is located the holding intracavity, strain grating is the prestretching structure, the unsettled combined material basement top of locating of temperature grating. The utility model adopts the same composite material as the wind power paddle as the substrate, and the substrate of the sensor is arranged on the paddle, so that strain transmission can be better carried out, and the detection precision of the sensor is improved; the temperature grating and the strain grating are packaged in the sensor, so that the temperature and the strain can be sensed simultaneously, the temperature self-compensation can be realized during signal demodulation, the temperature interference is eliminated, and the strain detection accuracy of the sensor is improved.
Description
Technical Field
The utility model relates to a sensor field especially relates to a temperature self compensating fiber grating strain transducer for wind-powered electricity generation blade monitoring.
Background
At present, in the field of wind power generation, as people have higher and higher requirements on the efficiency and load of power generation equipment, a safety monitoring system plays a greater and greater role. Once the wind generating set stops rotating due to the failure of a transmission device and an engine and the damage of a rotating blade, huge economic loss is caused. The wind power blade is one of key components of a wind generating set, and the performance of the wind power blade directly influences the performance of the whole system. The wind power blades are huge in size, are generally installed at high altitude in remote areas, are quite harsh in operating environment, various media in the air erode the blades almost every moment, and are possibly damaged by thunder, lightning, hail, rain, snow and sand at any time, and serious production accidents can be caused if the blades break and fall.
At present, the wind turbine generator is ensured to be safe in operation mainly by means of regular manual detection, the detection period is long, the detection is not timely, the accident of the wind turbine generator cannot be predicted and avoided in real time, and the loss reaches 37.4% of the wind turbine generator operation and maintenance cost according to incomplete statistics. The traditional electric measurement monitoring mode is easy to be interfered by electromagnetic waves, has various links, large additional weight and short service life, and can not meet the actual use requirement.
The Fiber Bragg Grating (FBG) sensor has the advantages of electromagnetic interference resistance, strong environmental adaptability, good insulating property, long service life, high integration level and the like, and is one of the sensors with the most potential for monitoring blade load and damage. And current fiber grating strain transducer is mostly the steel pipe encapsulation of civil structure etc. the steel sheet encapsulation, and long gauge length encapsulation etc. mostly is the metal material encapsulation, and the wind-powered electricity generation oar piece is mostly combined material, and metal and combined material install the back mutually, and the transmission of meeting an emergency can produce certain error, leads to the not high accuracy of testing result. In addition, when the environmental temperature of the paddle changes greatly, the surface of the paddle also generates strain, so that the accuracy of the fiber bragg grating sensor for detecting the strain is reduced.
Accordingly, the prior art is deficient and needs improvement.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the temperature self-compensation fiber grating strain sensor for monitoring the wind power blade is good in strain transfer effect, high in detection precision, small in size and light in weight.
The technical scheme of the utility model as follows: the temperature self-compensation fiber grating strain sensor for monitoring the wind power blade comprises a transmission optical fiber, a protective shell, a composite material substrate, a strain grating and a temperature grating, wherein the protective shell is packaged and coated on the top of the composite material substrate, a containing cavity is formed between the protective shell and the composite material substrate, the first end of the transmission optical fiber is arranged in the containing cavity, the second end of the transmission optical fiber penetrates through the containing cavity and is exposed out of the containing cavity, the strain grating and the temperature grating are respectively arranged on the transmission optical fiber in the containing cavity, the strain grating is of a pre-stretching structure, and the temperature grating is arranged above the composite material substrate in a hanging mode.
By adopting the technical scheme, the temperature self-compensation fiber grating strain sensor for monitoring the wind power blade is characterized in that the temperature grating is arranged at the position close to the first end of the transmission optical fiber, and the strain optical fiber is arranged at the position far away from the first end of the transmission optical fiber.
By adopting the technical scheme, in the temperature self-compensation fiber grating strain sensor for monitoring the wind power blade, the composite material substrate is a polyimide substrate.
By adopting the technical scheme, the temperature self-compensation fiber grating strain sensor for monitoring the wind power blade is characterized in that the protective shell is a silica gel soft shell.
By adopting the technical schemes, the utility model adopts the composite material which is the same as the wind power paddle as the substrate, and the substrate of the sensor is arranged on the paddle, thereby better performing strain transmission and improving the detection precision of the sensor; the temperature grating and the strain grating are packaged in the sensor, so that the temperature and the strain can be sensed simultaneously, the temperature self-compensation can be realized during signal demodulation, the temperature interference is eliminated, and the strain detection accuracy of the sensor is improved; the fiber grating sensor is packaged by the silica gel soft shell, has the characteristics of no electricity, small volume and light weight, and reduces the influence on the structure and performance of the operating paddle.
Drawings
Fig. 1 is a schematic view of the internal structure of the present invention;
fig. 2 is a schematic diagram of the external structure of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, a temperature self-compensation fiber grating strain sensor for monitoring a wind turbine blade includes a transmission fiber 1, a protective casing 5, a composite material substrate 2, a strain grating 4 and a temperature grating 3, wherein the protective casing 5 is encapsulated and coated on the top of the composite material substrate 2, an accommodating cavity is formed between the protective casing 5 and the composite material substrate 2, a first end of the transmission fiber 1 is disposed in the accommodating cavity, a second end of the transmission fiber 1 penetrates through the accommodating cavity and is exposed outside the accommodating cavity, the strain grating 4 and the temperature grating 3 are respectively disposed on the transmission fiber 1 located in the accommodating cavity, the strain grating 4 is in a pre-stretching structure, and the temperature grating 3 is suspended above the composite material substrate 2.
In order to reduce the weight of the blade, the blade for wind power generation is usually made of a composite material, and in the embodiment, the composite material substrate 2 which is the same as the wind power blade is adopted, so that the real deformation condition of the blade can be reflected, the error of the stress transmission of the blade is reduced, and the detection accuracy of the sensor is improved. Preferably, the composite substrate 2 is a polyimide substrate. Polyimide is used as one of organic polymer materials with the highest comprehensive performance and widely applied to blades for wind power generation, the polyimide substrate is used as the composite material substrate 2, the polyimide substrate can be matched with manufacturing materials of most wind power blades and is installed on the blades, the additional weight is small, the influence on the structure and the performance of the operating blades can be reduced, and the stress transfer error between the polyimide substrate and the blades can be reduced.
The transmission optical fiber 1 can transmit optical signals without electricity, and the strain grating 4 and the temperature grating 3 are respectively arranged on the transmission optical fiber 1, so that temperature and strain can be sensed simultaneously, and the strain detection precision of the sensor is improved. In this embodiment, the strain grating 4 is in a pre-stretching structure, and the strain grating 4 in the pre-stretching structure has a positive and negative self-adjusting function when being stretched for detection, so that a creeping phenomenon of a central wavelength of the strain grating 4 can be reduced when being stretched for detection, thereby improving the strain detection accuracy of the blade. In addition, the temperature grating 3 is arranged above the composite material substrate 2 in a suspended mode, so that the temperature grating 3 is in an unstressed state and is only influenced by temperature, and when signals are demodulated, an optical fiber signal analyzer connected with the sensor can calculate the sensing quantity of the two gratings, remove temperature change and finally output strain variation, and therefore temperature self-compensation of the sensor is achieved. Therefore, the temperature grating 3 and the strain grating 4 are respectively arranged on the transmission optical fiber 1, so that strain can be accurately transmitted, and the blade strain caused by temperature change is prevented, so that the detection result of the sensor is interfered. Further, the temperature grating 3 is disposed at a position close to the first end of the transmission fiber 1, and the strain fiber 4 is disposed at a position far from the first end of the transmission fiber 1.
A protective casing 5 is encapsulated on top of the composite substrate 2. Therefore, the protective shell 5 can hermetically protect the composite material substrate 2, the temperature grating 3 and the strain grating 4, and the grating damage is prevented from influencing the detection accuracy. Preferably, the protective casing 5 is a silicone rubber soft casing. The silica gel soft shell has good flexibility, flame resistance, non-oxidation property and sealing property, is packaged and coated with the composite material substrate 2, and also has good waterproof performance, and in the embodiment, the waterproof grade of the sensor can reach IP 67.
By adopting the technical schemes, the utility model adopts the composite material which is the same as the wind power paddle as the substrate, and the substrate of the sensor is arranged on the paddle, thereby better performing strain transmission and improving the detection precision of the sensor; the temperature grating and the strain grating are packaged in the sensor, so that the temperature and the strain can be sensed simultaneously, the temperature self-compensation can be realized during signal demodulation, the temperature interference is eliminated, and the strain detection accuracy of the sensor is improved; the fiber grating sensor is packaged by the silica gel soft shell, has the characteristics of no electricity, small volume and light weight, and reduces the influence on the structure and performance of the operating paddle.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides a temperature self compensating fiber grating strain transducer for wind-powered electricity generation blade monitoring which characterized in that: the optical fiber temperature sensor comprises a transmission optical fiber, a protective shell, a composite material substrate, a strain grating and a temperature grating, wherein the protective shell is packaged and coated on the top of the composite material substrate, an accommodating cavity is formed between the protective shell and the composite material substrate, the first end of the transmission optical fiber is arranged in the accommodating cavity, the second end of the transmission optical fiber penetrates through the accommodating cavity and is exposed out of the accommodating cavity, the strain grating and the temperature grating are respectively arranged on the transmission optical fiber in the accommodating cavity, the strain grating is of a pre-stretching structure, and the temperature grating is arranged above the composite material substrate in a suspended mode.
2. The temperature self-compensating fiber grating strain sensor for wind turbine blade monitoring of claim 1, wherein: the temperature grating is arranged at a position close to the first end of the transmission optical fiber, and the strain grating is arranged at a position far away from the first end of the transmission optical fiber.
3. The temperature self-compensating fiber grating strain sensor for wind turbine blade monitoring of claim 1, wherein: the composite material substrate is a polyimide substrate.
4. The temperature self-compensating fiber grating strain sensor for wind turbine blade monitoring of claim 1, wherein: the protective casing is a silica gel soft casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922182679.1U CN210833446U (en) | 2019-12-06 | 2019-12-06 | Temperature self-compensation fiber grating strain sensor for monitoring wind power blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922182679.1U CN210833446U (en) | 2019-12-06 | 2019-12-06 | Temperature self-compensation fiber grating strain sensor for monitoring wind power blade |
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| Publication Number | Publication Date |
|---|---|
| CN210833446U true CN210833446U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922182679.1U Active CN210833446U (en) | 2019-12-06 | 2019-12-06 | Temperature self-compensation fiber grating strain sensor for monitoring wind power blade |
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| CN (1) | CN210833446U (en) |
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