CN204359277U - A kind of turbine blade dynamic strain measurement system - Google Patents
A kind of turbine blade dynamic strain measurement system Download PDFInfo
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- CN204359277U CN204359277U CN201520032273.4U CN201520032273U CN204359277U CN 204359277 U CN204359277 U CN 204359277U CN 201520032273 U CN201520032273 U CN 201520032273U CN 204359277 U CN204359277 U CN 204359277U
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- fiber bragg
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- bragg grating
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Abstract
A kind of turbine blade dynamic strain measurement system, comprise wideband light source, optical fiber circulator (1), sense light fiber Bragg grating (2), filtering optical fiber Bragg raster (5), semiconductor cooler (4), temperature controller, photodetector (6), analog filter and data acquisition processing device, it is characterized in that sense light fiber Bragg grating (2) is pasted onto centre of surface between turbine blade; Filtering optical fiber Bragg raster (5) is pasted on the semiconductor cooler (4) told; Sense light fiber Bragg grating (2) is transferred to through optical fiber circulator (1) by wideband light source light out, the light meeting phase-matching condition is reflected, remaining is transmitted, reflected light incides filtering optical fiber Bragg raster (5) by optical fiber circulator (1), received by photodetector (6) through filtered light, then bandwidth is reduced through analog filter, restraint speckle, finally convert Computer signal to by data acquisition processing device and complete subsequent demodulation work, realizing making prevention observation to the fatigue break that turbine may occur.
Description
Technical field
The utility model relates to a kind of turbine blade dynamic strain measurement system, be specially utilize optical fiber Bragg raster centre wavelength offset measurement turbine blade suffered by STRESS VARIATION, prevention observation is made in the fatigue break that may occur turbine.
Background technology
Turbine is the important device of electric system widespread use, and by the rotor of high speed System of Rotating about Fixed Axis, stator forms with casing and bearing.The performance of turbine improves constantly in recent years, and structure is day by day to high rotating speed, high-level efficiency, high precision, high reliability trend development.Turbine rotor is usually with very high rotary speed working, it and air or gas-flow interact, become kinetic energy or pressure gas to obtain gases at high pressure thermal energy, the unbalanced centrifugal force etc. that is uneven, unstable and rotor of air flow method can make rotor oscillation, cause some assemblies in rotor unreliable at work, occur fatigue break.Therefore, to the measurement of turbine blade stress, namely unreliable at work to some assemblies in rotor, and the prevention observation occurring fatigue break is extremely important.
Optical fiber Bragg raster is a kind of wavelength-modulated type sensor, when object generation strain variation, the space periodic or the effective refractive index that are attached to the optical fiber Bragg raster of body surface change thus cause the drift of Bragg centre wavelength, can obtain corresponding strain value by the variable quantity of demodulation reflection wavelength.Therefore, optical fiber Bragg raster is particularly suitable for the measurement of real-time small strain, and has broad application prospects.
In actual measurement, due to the impact of external environment, temperature variation brings the drift of the Bragg wavelength of optical fiber Bragg raster may exceed the working range of optical fiber Bragg raster, brings difficulty to input, demodulation.Therefore, realize will contributing to the measurement of turbine blade dynamic strain to the optimal demodulation of optical fiber Bragg raster wavelength signals.
Summary of the invention
The utility model is for problems of the prior art, propose a kind of STRESS VARIATION method suffered by offset measurement turbine blade utilizing optical fiber Bragg raster centre wavelength, and realize making prevention observation to the fatigue break that may occur in turbine rotor high-speed operation by the optimal demodulation of temperature control optical fiber Bragg grating wavelength signal.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of turbine blade dynamic strain measurement system, comprise wideband light source, optical fiber circulator, sense light fiber Bragg grating, filtering optical fiber Bragg raster, semiconductor cooler, temperature controller, photodetector, analog filter and data acquisition processing device, the sense light fiber Bragg grating told is pasted onto centre of surface between turbine blade, and blade stress suffered by this point is proportional to the drift of Bragg reflected light centre wavelength, the filtering optical fiber Bragg raster told is pasted on the semiconductor cooler told, is controlled by the temperature of temperature controller to semiconductor cooler told, by the wideband light source told light out after described optical fiber circulator through Optical Fiber Transmission to sense light fiber Bragg grating, the light meeting Bragg raster phase matching condition is reflected, remaining is transmitted, reflected light incides filtering optical fiber Bragg raster by optical fiber circulator, through filtered light by described photoelectric detector, the light signal received reduces the bandwidth of signal through described analog filter, restraint speckle, then convert Computer signal to by data acquisition processing device and complete follow-up FTF time-frequency domain conversation, signal graph display and file preservation work, realize making prevention observation to the fatigue break that turbine may occur.
The temperature of temperature controller to semiconductor cooler controls, and then can the temperature of regulating and controlling filtering optical fiber Bragg raster, make the Bragg wavelength-shift of filtering optical fiber Bragg raster, reach and the matching of the Bragg wavelength of sense light fiber Bragg grating, meanwhile, use the fiber Bragg Grating Strain Sensor device encapsulated as filtering optical fiber Bragg raster, temperature control filtering optical fiber Bragg raster tuning range can be improved like this, can effectively solve because temperature variation brings the Bragg wave length shift of optical fiber Bragg raster to exceed the problem of the working range of optical fiber Bragg raster, also the optimum matching of realization and sensor fibre Bragg grating wavelength signal is contributed to.
The utility model tool has the following advantages:
1. the optical fiber Bragg grating sensor that the utility model adopts has electromagnetism interference, lightweight, long transmission distance, the advantage such as corrosion-resistant, and measured signal be adopt Wavelength-encoding, can distributed measurement and to be easy to same optical-mechanical system integrated;
2. the utility model is by temperature controlled method and adopt the fiber Bragg Grating Strain Sensor device that encapsulated as filtering optical fiber Bragg raster, better can complete the optimum matching of sensor fibre Bragg grating wavelength signal, effectively can solve because temperature variation brings the Bragg wave length shift of optical fiber Bragg raster to exceed the problem of the working range of optical fiber Bragg raster, realize making prevention observation to the fatigue break that may occur in turbine rotor high-speed operation.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present utility model
Wherein: 1-optical fiber circulator
2-sense light fiber Bragg grating
3-turbine blade
4-semiconductor cooler
5-filtering optical fiber Bragg raster
6-photodetector
Specific embodiment
The problem that the utility model needs solve is the stress measurement of turbine blade, namely unreliable at work to some assemblies in rotor, and the prevention recording geometry of fatigue break.Ultimate principle be utilize optical fiber Bragg raster centre wavelength offset measurement turbine blade suffered by STRESS VARIATION method, and realize making prevention observation to the fatigue break that may occur in turbine rotor high-speed operation by the optimal demodulation of temperature control optical fiber Bragg grating wavelength signal.
Below in conjunction with the drawings and specific embodiments, the utility model is further elaborated.
A kind of turbine blade dynamic strain measurement system, comprise wideband light source, optical fiber circulator 1, sense light fiber Bragg grating 2, filtering optical fiber Bragg raster 5, semiconductor cooler 4, temperature controller, photodetector 6, analog filter and data acquisition processing device, the sense light fiber Bragg grating 2 told is pasted onto centre of surface between turbine blade, and blade stress suffered by this point is proportional to the drift of Bragg reflected light centre wavelength; The filtering optical fiber Bragg raster 5 told is pasted on the semiconductor cooler 4 told, is controlled by the temperature of temperature controller to semiconductor cooler 4 told.
What wideband light source of the present utility model was selected is the ASE wide spectrum light source that FooxTek company limited produces, and can provide centre wavelength 1550nm, and spectrum width is stable more than the high power of 40hm to be exported.
Sense light fiber Bragg grating 2 is pasted onto centre of surface between turbine blade 3, turbine blade 3 stress suffered by this point is proportional to the drift of Bragg reflected light centre wavelength, the light meeting Bragg phase-matching condition is reflected, remaining is transmitted, isolate through optical fiber circulator 1 from sense light fiber Bragg grating 2 light out, do not return light source.
The Bragg reflected light of sense light fiber Bragg grating 2 incides filtering optical fiber Bragg raster 5 by optical fiber circulator 1, filtering optical fiber Bragg raster 5 is pasted on the semiconductor cooler 4 told, by the control of temperature controller to semiconductor cooler 4 temperature, achieve the control to sense light fiber Bragg grating 2 temperature, make the Bragg wavelength-shift of filtering optical fiber Bragg raster 5, reach and match with the Bragg2 wavelength of sense light fiber Bragg grating, meanwhile, the utility model also uses the fiber Bragg Grating Strain Sensor device encapsulated as filtering optical fiber Bragg raster 5, temperature control filtering optical fiber Bragg raster 5 tuning range can be improved like this, can effectively solve because temperature variation brings the Bragg wave length shift of optical fiber Bragg raster to exceed the problem of the working range of optical fiber Bragg raster, also contribute to realize and sense light fiber Bragg grating 2 wavelength match, the object of the optimal demodulation reached.For temperature controller, the utility model selects Pelter chip and AD590 temperature sensing chip respectively as the control end of temperature controller and feedback device, and temperature control scope is 0 DEG C ~ 50 DEG C, and feedback accuracy is 0.1 DEG C.
InGaAs PIN photodiode selected by photodetector 6, and its spectral response range is 850 ~ 1700nm, responsiveness λ=1550nm, Re=0.9mA/mW, and dark current representative value is 3nA; Analog filter selects Nanjing An Zheng softcom limited to produce, and model is the analogue amplifier of AZ802A, has analog filtering and amplifies two functions; Data acquisition processing device selects NI PCI-6013 type data collecting card, provides the measurement of 16 precision, the single-ended or 8 road difference analogues inputs in 16 tunnels, and most high sampling rate is 200kS/s.
Light signal detected by photodetector 6 is through analog filter, analog filter Main Function is the bandwidth reducing signal, be conducive to restraint speckle and image data more accurately, then convert Computer signal to by data acquisition processing device and complete follow-up FTF time-frequency domain conversation, signal graph display and file preservation work.
It is the demodulation mode that a kind of cost compare is low that the utility model utilizes filtering optical fiber Bragg raster 5 to carry out demodulation as wave filter to sense light fiber Bragg grating 2, achieves the demodulation of Bragg wavelength-shift.Utilize the performance-adjustable of temperature control filtering optical fiber Bragg raster 5 simultaneously, be adjusted to and make sense light fiber Bragg grating 2 reflected light transmissivity change maximum state, ensure that best filter effect.
The principle of work of the present embodiment is as described below:
First, by wideband light source light out after described optical fiber circulator 1 through Optical Fiber Transmission to sense light fiber Bragg grating 2, the light meeting Bragg raster phase matching condition is reflected, remaining is transmitted, reflected light incides filtering optical fiber Bragg raster 5 by optical fiber circulator 1, received by photodetector 6 through filtered light, the light signal received reduces the bandwidth of signal through analog filter, restraint speckle, then convert Computer signal to by data acquisition processing device and complete follow-up FTF time-frequency domain conversation, signal graph display and file preservation work, realize making prevention observation to the fatigue break that turbine may occur.
Above-described hardware material is the common model of this area; and be only preferred embodiment of the present utility model; not the present invention is imposed any restrictions; every above embodiment is done according to the utility model essence any simple modification, change and equivalent structure transformation, all still belong in the protection domain of technical solutions of the utility model.
Claims (2)
1. a turbine blade dynamic strain measurement system, comprise wideband light source, optical fiber circulator (1), sense light fiber Bragg grating (2), filtering optical fiber Bragg raster (5), semiconductor cooler (4), temperature controller, photodetector (6), analog filter and data acquisition processing device, it is characterized in that described sense light fiber Bragg grating (2) is pasted onto centre of surface between turbine blade, described filtering optical fiber Bragg raster (5) is pasted on described semiconductor cooler (4), by described wideband light source light out through described optical fiber circulator (1) by Optical Fiber Transmission to sense light fiber Bragg grating (2), the light meeting Bragg raster phase matching condition is reflected, remaining is transmitted, reflected light incides filtering optical fiber Bragg raster (5) by optical fiber circulator (1), received by described photodetector (6) through filtered light, the light signal received reduces the bandwidth of signal through described analog filter, restraint speckle, then convert Computer signal to by described data acquisition processing device and complete follow-up FTF time-frequency domain conversation, signal graph display and file preservation work, realize making prevention observation to the fatigue break that turbine may occur.
2. a kind of turbine blade dynamic strain measurement system according to claim 1, is characterized in that described filtering optical fiber Bragg raster (5) uses the fiber Bragg Grating Strain Sensor device encapsulated.
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| CN201520032273.4U CN204359277U (en) | 2015-01-14 | 2015-01-14 | A kind of turbine blade dynamic strain measurement system |
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| CN201520032273.4U CN204359277U (en) | 2015-01-14 | 2015-01-14 | A kind of turbine blade dynamic strain measurement system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507453A (en) * | 2018-12-06 | 2019-03-22 | 广州广电计量检测股份有限公司 | A kind of revolving speed calibration system and calibration method based on fiber grating |
| CN109596570A (en) * | 2018-10-24 | 2019-04-09 | 昆明理工大学 | A kind of biochemical sensitive system based on Si-based photodetectors |
| CN110030900A (en) * | 2019-04-25 | 2019-07-19 | 沈阳透平机械股份有限公司 | A kind of reel grid deviation measurement method of fluting welding impeller |
| CN112595253A (en) * | 2020-11-10 | 2021-04-02 | 新疆大学 | Surface strain dynamic optical fiber grating detection device |
-
2015
- 2015-01-14 CN CN201520032273.4U patent/CN204359277U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596570A (en) * | 2018-10-24 | 2019-04-09 | 昆明理工大学 | A kind of biochemical sensitive system based on Si-based photodetectors |
| CN109507453A (en) * | 2018-12-06 | 2019-03-22 | 广州广电计量检测股份有限公司 | A kind of revolving speed calibration system and calibration method based on fiber grating |
| CN110030900A (en) * | 2019-04-25 | 2019-07-19 | 沈阳透平机械股份有限公司 | A kind of reel grid deviation measurement method of fluting welding impeller |
| CN112595253A (en) * | 2020-11-10 | 2021-04-02 | 新疆大学 | Surface strain dynamic optical fiber grating detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20160114 |