CN111006600A - System for measuring satellite temperature and deformation quantity by using fiber bragg grating - Google Patents

System for measuring satellite temperature and deformation quantity by using fiber bragg grating Download PDF

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Publication number
CN111006600A
CN111006600A CN201911055510.8A CN201911055510A CN111006600A CN 111006600 A CN111006600 A CN 111006600A CN 201911055510 A CN201911055510 A CN 201911055510A CN 111006600 A CN111006600 A CN 111006600A
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China
Prior art keywords
measuring
module
light
temperature
deformation
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Pending
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CN201911055510.8A
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Chinese (zh)
Inventor
张立东
王健
郭春辉
王雷
王涛
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China Academy of Space Technology CAST
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China Academy of Space Technology CAST
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Priority to CN201911055510.8A priority Critical patent/CN111006600A/en
Publication of CN111006600A publication Critical patent/CN111006600A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/18Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres

Abstract

The utility model provides a system for utilize fiber grating to satellite temperature and deformation volume carry out measurement, including measuring the light path module, measure the light source, measure the light demodulation module, data processing and communication module, power module, sensor array, the temperature measurement or the deformation volume measurement of large scale that realize through using the sensor array of fiber grating and wrapper combination to replace thermistor to realize to utilize and measure the light demodulation module, data processing and communication module realize the demodulation processing to temperature value and deformation volume value, realize multichannel optic fibre timesharing measurement function, simplify the system constitution, reduce the assembly degree of difficulty.

Description

System for measuring satellite temperature and deformation quantity by using fiber bragg grating
Technical Field
The invention relates to a system for measuring satellite temperature and deformation by using fiber bragg gratings, belonging to the field of satellite temperature measurement.
Background
Different types of thermistors have suitable temperature measuring intervals. In a proper temperature range, the temperature sensor is sensitive to temperature change, has high precision and is suitable for temperature measurement; in an inappropriate temperature range, the resistance value is insensitive to temperature change, the accuracy is poor, and the method is not suitable for temperature measurement. The working temperature range of each part of the satellite is large, some parts work in a low-temperature region of-40 ℃ to 0 ℃ for a long time, and a thermistor sensitive to low temperature needs to be selected, and some parts work in a normal-temperature region of 0 ℃ to 50 ℃ for a long time, and a thermistor sensitive to normal temperature needs to be selected; some parts work in a high temperature region of 70-120 ℃, and a thermistor sensitive to high temperature needs to be selected. Therefore, the thermistor with a single model cannot meet the requirement of temperature measurement of the whole satellite of the satellite, and different measurement objects need to be provided with thermistor models which are adaptive to the temperature ranges of the measurement objects, so that the complexity and difficulty of design, development and assembly of a satellite thermal control system are increased.
Disclosure of Invention
The technical problem solved by the invention is as follows: aiming at the defects that the traditional thermistor temperature measuring interval is narrow, the accuracy of the antenna paraboloid cannot be accurately measured and the like in the prior art, the system for measuring the satellite temperature and the deformation by using the fiber grating is provided.
The technical scheme for solving the technical problems is as follows:
the utility model provides an utilize fiber grating to carry out measuring system to satellite temperature and deformation volume, includes measurement light path module, measurement light source, measurement light demodulation module, data processing and communication module, power module, sensor array, wherein:
a light path measuring module: receiving measuring light with the same wavelength emitted by a measuring light source, controlling the light path direction of the measuring light, and outputting the measuring light to a sensor array through a specified optical fiber according to a light path gating instruction sent by a data processing and communication module; receiving a diffraction light signal which is input by a sensor array and contains measuring point temperature information or measuring point deformation information, controlling the direction of a light path of the signal according to a light path gating instruction sent by a data processing and communication module, and sending the signal to a measuring light demodulation module;
measuring a light source: transmitting the measuring light with the appointed wavelength to a measuring light path module;
a measurement light demodulation module: demodulating the wavelength of the diffraction light signal, converting the diffraction light signal into a digital signal containing the temperature or deformation data of the measuring point, and sending the digital signal to a data processing and communication module;
the data processing and communication module: converting data contained in a digital signal converted from a diffraction light signal, storing sensor array measuring point position information corresponding to the digital signal and a converted temperature or deformation amount, and packaging and outputting the sensor array measuring point position information and the corresponding temperature or deformation amount information according to an external calling instruction after the storage of all measuring point position information and the corresponding temperature or deformation amount information of the sensor array is finished; meanwhile, a light path gating instruction is sent to the measurement light path module at regular time according to the module gating period;
a sensor array: the device comprises a satellite device, a measurement light path module, a measurement light source, a measurement point temperature module, a measurement point deformation module and a diffraction light signal module, wherein the satellite device is arranged at a designated position on the surface of the satellite device according to the thermal control and mechanical measurement requirements of the satellite, is connected in series through optical fibers, receives measurement light with a designated wavelength emitted by the measurement light source, changes the wavelength of the measurement light, and sends the diffracted light signal containing measurement point temperature information or measurement point;
a power supply module: and supplying power to other modules.
Still include the state monitoring module, wherein:
the state monitoring module collects voltage analog quantities of other modules for the data processing and communication module to call regularly, judges whether the working state of each module is normal or not through the data processing and communication module, stores the working state of each module, and switches the modules with abnormal working states from main backup to backup.
The measuring light path module comprises a light path gating switch and a circulator, wherein:
an optical path gating switch: gating the light source transmitted by the circulator according to a light path gating instruction sent by the data processing and communication module, and outputting the light path gating instruction to a specified optical fiber; meanwhile, sending the diffraction light signal returned by the appointed optical fiber into a circulator;
a circulator: and the measuring light source and the light path gating switch are internally communicated, and the light path gating switch and the measuring light demodulation module are internally communicated to control the light path direction of the measuring light.
The data processing and communication module comprises a singlechip processing unit, a memory unit and an interface unit, wherein:
the singlechip processing unit: converting data contained in a digital signal converted from a diffraction light signal, sending sensor array measuring point position information corresponding to the digital signal and converted temperature or deformation amount information to a memory unit, and calling the required data by the memory unit according to an external calling instruction; setting a module gating period and sending a light path gating instruction to the measurement light path module at regular time;
a memory cell: storing the information sent by the singlechip processing unit;
1553B interface unit: receiving an external calling instruction and forwarding the external calling instruction to the single chip microcomputer processing unit; and simultaneously, the system is used as an information interaction channel of all digital signals containing temperature or deformation and external calling instructions.
The sensor array comprises gratings and a packaging device, the gratings are respectively arranged at the appointed positions of the optical fibers corresponding to the satellite equipment, and the packaging device is arranged on the surface of the satellite equipment after being packaged by the packaging device.
The optical fiber adopts an enhanced radiation-resistant R1310-HTA optical fiber.
The measurement light demodulation module is installed in the special radiation-proof cavity to reduce the radiation quantity and intensity of the space irradiation to the measurement light demodulation module.
The diameter of the optical fiber core is 125 mu m, and the packaging device adopts a cuboid structure.
Compared with the prior art, the invention has the advantages that:
according to the system for measuring the satellite temperature and the deformation by using the fiber bragg grating, the fiber bragg grating is adopted to replace the traditional temperature and deformation measuring mode of a thermistor, meanwhile, the grating sensitive element is manufactured in the fiber core, the temperature or deformation measurement can be realized on one fiber, and compared with the thermistor, the system has obvious advantages in size and weight, is beneficial to reducing the number of cables and reducing the weight of a satellite platform; meanwhile, the optical switch is used for gating, the time-sharing measurement function of the multi-path optical fibers is realized, the requirements and the characteristics of multiple temperature measurement points and wide distribution on the satellite are met, the flow of the thermistor type can be selected according to the temperature range of a temperature measurement object, and the complexity and the difficulty of design, development and assembly can be simplified.
Drawings
FIG. 1 is a schematic diagram of a measurement system configuration provided by the present invention;
FIG. 2 is a schematic view of the placement of the encapsulator provided by the invention;
Detailed Description
The utility model provides an utilize fiber grating to satellite temperature and deformation volume system of carrying out measurement, improves the design through the sensor array to containing the fiber grating, demodulates the output to the signal of receiving, has solved the temperature measurement interval narrower problem that uses traditional thermistor to cause easily, as shown in figure 1, specifically includes measuring light path module, measuring light source, measuring light demodulation module, data processing and communication module, power module, sensor array, wherein:
the measuring light path module receives measuring light with the same specified wavelength emitted by the measuring light source, controls the light path direction of the measuring light, outputs the measuring light to the sensor array through a specified optical fiber according to a light path gating instruction sent by the data processing and communication module, simultaneously receives a diffraction light signal which is input by the sensor array and contains measuring point temperature information or measuring point deformation information, controls the light path direction of the signal according to the light path gating instruction sent by the data processing and communication module, and sends the signal to the measuring light modulation module;
the measuring light path module mainly comprises a light path gating switch and a circulator, wherein the light path gating switch gates a light source transmitted by the circulator according to a light path gating instruction sent by the data processing and communication module and outputs the light source to a specified optical fiber; meanwhile, sending the diffraction light signal returned by the appointed optical fiber into a circulator; the circulator needs to communicate the measuring light source and the light path gating switch internally, and simultaneously communicates the light path gating switch and the measuring light demodulation module internally, so as to control the direction of the light path of the measuring light, and finally form an annular gating light path for receiving the measuring light;
in the measuring light demodulation module, the wavelength of the diffraction light signal is demodulated, the diffraction light signal is converted into a digital signal containing measuring point temperature or deformation data, and the digital signal is sent to the data processing and communication module;
in the data processing and communication module, converting data contained in a digital signal converted from a diffraction light signal, storing sensor array measuring point position information corresponding to the digital signal and a converted temperature or deformation amount, and packaging and outputting the sensor array measuring point position information and the corresponding temperature or deformation amount information according to an external calling instruction after the storage of the sensor array measuring point position information and the corresponding temperature or deformation amount information is finished; and simultaneously, regularly sending a light path gating instruction to the measurement light path module according to the module gating period, wherein:
the data processing and communication module mainly comprises a single chip microcomputer processing unit, a memory unit and an interface unit, converts data contained in a digital signal converted from a diffraction light signal by using the single chip microcomputer processing unit, sends sensor array measuring point position information corresponding to the digital signal and temperature or deformation amount information obtained by conversion to the memory unit, and calls the required data by the memory unit according to an external calling instruction; setting a module gating period and sending a light path gating instruction to the measurement light path module at regular time; meanwhile, information sent by the singlechip processing unit is stored in the memory unit, and an external calling instruction is received by the 1553B interface unit and forwarded to the singlechip processing unit to serve as an information interaction channel of all digital signals containing temperature or deformation and the external calling instruction;
according to the measurement requirements of thermal control and mechanical deformation measurement of the satellite, the sensor array is arranged at a designated position on the surface of the satellite equipment, the sensor array is connected in series through optical fibers, the measurement light with a designated wavelength emitted by a measurement light source is received, the wavelength of the measurement light is changed, a diffracted light signal containing temperature information or deformation information of a measurement point after diffraction is sent to a measurement light path module, and a power supply module is used for supplying power to all the modules.
The sensor array mainly comprises gratings and an encapsulator, wherein the gratings are respectively arranged at the appointed positions of optical fibers corresponding to satellite equipment, the encapsulator is arranged on the surface of the satellite equipment after being encapsulated by the encapsulator, and in order to meet the requirement of a satellite operation environment, enhanced anti-radiation optical fibers R1310-HTA are adopted; and writing a grating on the optical fiber by adopting a phase mask method, wherein the length of the grating is 12mm, and the 3dB bandwidth is less than 0.2 nm.
Meanwhile, the system also comprises a state monitoring module which is used for collecting voltage analog quantities of other modules for the data processing and communication module to regularly collect, judging whether the working state of each module is normal or not through the data processing and communication module, storing the working state of each module and switching the modules with abnormal working states.
The optical path gating instruction for controlling the optical switch needs to be determined according to a clock set in each module judged by the data processing and communication module, the gated optical path is replaced once every specified time period, and the specific time period needs to be determined according to task requirements.
The measuring light demodulation module does not have enough radiation resistance, so that the measuring light demodulation module cannot stably work on the track for a long time. Therefore, the system designs a special tantalum shell for the measuring light demodulation module, and the special tantalum shell is installed on a printed board at the periphery of the measuring light demodulation module, so that the radiation quantity and the intensity of the space irradiation to the measuring light demodulation module are reduced, and the requirement of on-rail stable operation is met.
The material of the fiber grating is Si02And the core diameter is smaller. In order to improve the mechanical strength of the fiber grating, the fiber grating is packaged by adopting an aluminum alloy material during packaging.
Because the grating sensor is an element sensitive to temperature and deformation in a crossed manner, when a sensor array is designed, a groove fixing structure is designed for packaging the temperature sensor, so that the grating is in a free state, and the influence of deformation caused by expansion caused by heat, contraction caused by cold and the like on temperature measurement precision of a packaging shell is avoided. The structure of which is shown in figure 2.
In order to realize the function of deformation measurement, the deformation sensor probe adopts a method that bare fiber written with grating is directly adhered to a measured object, a temperature sensor probe is arranged beside each deformation sensor probe to measure the temperature of a deformation measurement point, and the influence of temperature change on the deformation measurement precision is eliminated through a temperature compensation algorithm.
The following is further illustrated with reference to specific examples:
in this embodiment, a measuring light source generates light with a bandwidth of 1526nm to 1566nm, the light enters a light path gating switch through a circulator, is gated according to a light path gating instruction and is output to a specified optical fiber, a diffracted light signal returned by the optical fiber passes through the circulator again in a measuring light demodulation module, the wavelength of the diffracted light signal is demodulated, the diffracted light signal is converted into a digital signal containing temperature or deformation data of a measuring point, data contained in the digital signal converted by the diffracted light signal is converted in a data processing and communication module, the position information of the measuring point of a sensor array and the temperature or deformation quantity obtained by conversion corresponding to the digital signal are stored, and after the storage is completed, all stored information is packaged and output, wherein the optical fiber measuring and demodulating instrument is powered by a 100V bus of a satellite, the total number of optical fibers is 4, and all the optical fibers are enhanced radiation-resistant optical fibers R1310-HTA optical fiber, the diameter of the optical fiber core is 125 μm, 8 temperature measuring gratings are written on each optical fiber by adopting a phase mask method, 6 of the temperature measuring gratings are packaged by a packaging device and used for measuring temperature, and 2 of the temperature measuring gratings are not packaged and used for measuring deformation. The grating length is 12mm, the grating reflectivity is more than 95%, and the signal-to-noise ratio is more than 15%;
the material of the fiber grating is Si02And the core diameter is smaller. In order to improve the mechanical strength of the fiber grating and improve the temperature measurement precision, the aluminum alloy material is adopted to carry out grating packaging on the temperature sensor probe, the packaging device specifically adopts a cuboid with the thickness of 25mm, the width of 3mm and the height of 3mm, the cuboid is divided into a groove and a cover, the optical fiber containing the grating is arranged in the groove, the free and straight state is kept, and the influence of the deformation of the grating part on the temperature measurement precision is avoided.
The invention is not described in detail and is within the knowledge of a person skilled in the art.

Claims (8)

1. A system for measuring the temperature and deformation of a satellite by using a fiber grating is characterized in that: including measuring light path module, measuring light source, measuring light demodulation module, data processing and communication module, power module, sensor array, wherein:
a light path measuring module: receiving measuring light with the same wavelength emitted by a measuring light source, controlling the light path direction of the measuring light, and outputting the measuring light to a sensor array through a specified optical fiber according to a light path gating instruction sent by a data processing and communication module; receiving a diffraction light signal which is input by a sensor array and contains measuring point temperature information or measuring point deformation information, controlling the direction of a light path of the signal according to a light path gating instruction sent by a data processing and communication module, and sending the signal to a measuring light demodulation module;
measuring a light source: transmitting the measuring light with the appointed wavelength to a measuring light path module;
a measurement light demodulation module: demodulating the wavelength of the diffraction light signal, converting the diffraction light signal into a digital signal containing the temperature or deformation data of the measuring point, and sending the digital signal to a data processing and communication module;
the data processing and communication module: converting data contained in a digital signal converted from a diffraction light signal, storing sensor array measuring point position information corresponding to the digital signal and a converted temperature or deformation amount, and packaging and outputting the sensor array measuring point position information and the corresponding temperature or deformation amount information according to an external calling instruction after the storage of all measuring point position information and the corresponding temperature or deformation amount information of the sensor array is finished; meanwhile, a light path gating instruction is sent to the measurement light path module at regular time according to the module gating period;
a sensor array: the device comprises a satellite device, a measurement light path module, a measurement light source, a measurement point temperature module, a measurement point deformation module and a diffraction light signal module, wherein the satellite device is arranged at a designated position on the surface of the satellite device according to the thermal control and mechanical measurement requirements of the satellite, is connected in series through optical fibers, receives measurement light with a designated wavelength emitted by the measurement light source, changes the wavelength of the measurement light, and sends the diffracted light signal containing measurement point temperature information or measurement point;
a power supply module: and supplying power to other modules.
2. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 1, wherein: still include the state monitoring module, wherein:
the state monitoring module collects voltage analog quantities of other modules for the data processing and communication module to call regularly, judges whether the working state of each module is normal or not through the data processing and communication module, stores the working state of each module, and switches the modules with abnormal working states from main backup to backup.
3. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 1, wherein: the measuring light path module comprises a light path gating switch and a circulator, wherein:
an optical path gating switch: gating the light source transmitted by the circulator according to a light path gating instruction sent by the data processing and communication module, and outputting the light path gating instruction to a specified optical fiber; meanwhile, sending the diffraction light signal returned by the appointed optical fiber into a circulator;
a circulator: and the measuring light source and the light path gating switch are internally communicated, and the light path gating switch and the measuring light demodulation module are internally communicated to control the light path direction of the measuring light.
4. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 1, wherein: the data processing and communication module comprises a singlechip processing unit, a memory unit and an interface unit, wherein:
the singlechip processing unit: converting data contained in a digital signal converted from a diffraction light signal, sending sensor array measuring point position information corresponding to the digital signal and converted temperature or deformation amount information to a memory unit, and calling the required data by the memory unit according to an external calling instruction; setting a module gating period and sending a light path gating instruction to the measurement light path module at regular time;
a memory cell: storing the information sent by the singlechip processing unit;
1553B interface unit: receiving an external calling instruction and forwarding the external calling instruction to the single chip microcomputer processing unit; and simultaneously, the system is used as an information interaction channel of all digital signals containing temperature or deformation and external calling instructions.
5. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 1, wherein: the sensor array comprises gratings and a packaging device, the gratings are respectively arranged at the appointed positions of the optical fibers corresponding to the satellite equipment, and the packaging device is arranged on the surface of the satellite equipment after being packaged by the packaging device.
6. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 1, wherein: the optical fiber adopts an enhanced radiation-resistant R1310-HTA optical fiber.
7. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 1, wherein: the measurement light demodulation module is installed in the special radiation-proof cavity to reduce the radiation quantity and intensity of the space irradiation to the measurement light demodulation module.
8. The system for measuring the temperature and the deformation of the satellite by using the fiber grating as claimed in claim 6, wherein: the diameter of the optical fiber core is 125 mu m, and the packaging device adopts a cuboid structure.
CN201911055510.8A 2019-10-31 2019-10-31 System for measuring satellite temperature and deformation quantity by using fiber bragg grating Pending CN111006600A (en)

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CN1343873A (en) * 2000-09-15 2002-04-10 饶云江 Integrated optical fibre strain and temp sensor device
JP2005055450A (en) * 2004-11-29 2005-03-03 Kyowa Electron Instr Co Ltd Optical fiber strain gage
CN1924627A (en) * 2006-09-08 2007-03-07 哈尔滨工业大学 Distributed cone optical-fiber grating sensor, its band width demodulator and detection method
CN103017804A (en) * 2012-12-26 2013-04-03 中国科学院上海光学精密机械研究所 High-time-synchronization multichannel fiber bragg grating sensing system
JP2013113830A (en) * 2011-12-01 2013-06-10 Hitachi Ltd Multipoint measuring method and multipoint measuring device, using fbg sensor
CN103604446A (en) * 2013-11-04 2014-02-26 清华大学 Multi-channel fiber bragg grating absolute wavelength demodulation system based on single detector and method thereof
CN104967220A (en) * 2015-07-16 2015-10-07 国网河南省电力公司漯河供电公司 Transformer substation monitoring system
CN205156936U (en) * 2015-12-03 2016-04-13 珠海市光辰科技有限公司 Fiber grating demodulating equipment based on semiconductor laser
CN108398144A (en) * 2017-12-25 2018-08-14 北京航天控制仪器研究所 Aerospace fiber grating sensing system and method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1343873A (en) * 2000-09-15 2002-04-10 饶云江 Integrated optical fibre strain and temp sensor device
JP2005055450A (en) * 2004-11-29 2005-03-03 Kyowa Electron Instr Co Ltd Optical fiber strain gage
CN1924627A (en) * 2006-09-08 2007-03-07 哈尔滨工业大学 Distributed cone optical-fiber grating sensor, its band width demodulator and detection method
JP2013113830A (en) * 2011-12-01 2013-06-10 Hitachi Ltd Multipoint measuring method and multipoint measuring device, using fbg sensor
CN103017804A (en) * 2012-12-26 2013-04-03 中国科学院上海光学精密机械研究所 High-time-synchronization multichannel fiber bragg grating sensing system
CN103604446A (en) * 2013-11-04 2014-02-26 清华大学 Multi-channel fiber bragg grating absolute wavelength demodulation system based on single detector and method thereof
CN104967220A (en) * 2015-07-16 2015-10-07 国网河南省电力公司漯河供电公司 Transformer substation monitoring system
CN205156936U (en) * 2015-12-03 2016-04-13 珠海市光辰科技有限公司 Fiber grating demodulating equipment based on semiconductor laser
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