CN2807227Y - Optical fiber grating sensing and demodulating display device - Google Patents
Optical fiber grating sensing and demodulating display device Download PDFInfo
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- CN2807227Y CN2807227Y CN 200520111897 CN200520111897U CN2807227Y CN 2807227 Y CN2807227 Y CN 2807227Y CN 200520111897 CN200520111897 CN 200520111897 CN 200520111897 U CN200520111897 U CN 200520111897U CN 2807227 Y CN2807227 Y CN 2807227Y
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Abstract
The utility model discloses an optical fiber grating sensing and demodulation display device, which is connected with an optical fiber coupler through at least one optical fiber grating probe. The optical fiber coupler is connected with a sensing demodulator through an optical fiber, and the sensing demodulator is also connected with a waveform display in the operation wavelength range of an optical fiber grating probe. The sensing demodulator is respectively connected with a data acquisition module and a display processor through wires, the data acquisition module and the display processor are connected with wires, and other ports of the display processor are respectively connected with a trace storer, an LCD color display module, a keyboard, a coding interface, a PC interface and a Local area network interface by wires. The utility model adopts the method of the combination of the optical fiber sensing detection technique of scanning and visualization and the technique of waveform display sampling conversion, designs an optical fiber grating sensing and demodulation display device with high precision and low cost and displays the central wavelength value and waveform. The utility model has the advantages of high measurement precision and low cost.
Description
Technical field
The utility model belongs to optical fiber grating sensing, optical measuring device, particularly a kind of optical fiber grating sensing and demodulating display device.
Background technology
Fiber grating is a kind of optical device with narrowband reflection characteristic that is produced on the optical fiber.Because the elastic deformation and the thermal expansion character of optical fiber make it very responsive to temperature and stress.Therefore, be widely used in recent years in the sensing measurement of temperature, stress etc.Use fiber grating to be exactly: accurately to separate the Bragg wavelength change amount of reading fast, promptly to the demodulation of Bragg wavelength as the technology of senser element most critical.Traditional demodulation method is: use spectrometer, monochromator or wavemeter etc., directly measure the wavelength location of fiber Bragg grating reflected signal.This demodulation mode is simple, measuring accuracy is high, and prices are rather stiff but adopt these related instrument and meters of this method, and not portable, can not be applied in in-site measurement and the on-line measurement.
People have proposed some novel wavelength information demodulation schemes in recent years, have in the prior art abroad: Mach-Zehnder interferometer mode, adjustable Fabry-Bai Luo wave filter method, matched fiber grating wave filter method etc.
Utilize tunable laser as testing light source, optical maser wavelength continuous sweep in certain scope of output, according to the position of light signal in the scan period, can measure the variation of fiber grating reflected light wavelength, the advantage of this method is that energy of reflection light height, signal are easy to detect, the resolution height.But the deficiency of this method is the difficulty that designs and produces of light source, and the cost height costs an arm and a leg, and inconvenience still is applied in the actual sensor-based system.
Utilize wideband light source as testing light source, utilize tunable optic filter as restitution element for sensor fibre optical grating reflection light signal, with sensed light signal such as light power meters, the precision of this method is subject to the restriction of the qualitative and external interference of light source, and the wavelength coverage of sensing and demodulating is smaller.
Above method all respectively has characteristics, but all is the data based on the demodulation wavelength variable quantity, can not intactly directly reflect wavelength properties, does not have waveform to show, and is not directly perceived.
Demodulation techniques in the fiber grating sensing system are one of barriers of optical fiber grating sensing application, and measurement how accurate, that stablize, finish cheaply optic fiber grating wavelength is just becoming one of hot technology in the sensor research field.
Summary of the invention
The purpose of this utility model provides a kind of measuring accuracy height and can directly reflect wavelength properties, a kind of optical fiber grating sensing and demodulating display device of display waveform.
For achieving the above object, solution of the present utility model is: a kind of optical fiber grating sensing and demodulating display device, link to each other with fiber coupler by at least one fiber grating probe, fiber coupler links to each other with the sensing and demodulating device by optical fiber, also connect a waveform oscilloscope in the operating wavelength range of described fiber grating probe on the described sensing and demodulating device, described sensing and demodulating device respectively with data acquisition module, display processor connects with lead, described data acquisition module is connected with lead with described display processor, other port of display processor respectively with the trace storer, the colored display module of LCD, keyboard and coding, the PC interface, lan interfaces connects with lead.
The utility model solves in the prior art can not intactly directly reflect optic fiber grating wavelength character, does not have waveform to show, observes not problem intuitively.Adopt scan-type, visual optical fiber grating sensing detection technique and the method that waveform demonstration unscented transformation technology combines, design a kind of precision height, optical fiber grating sensing and demodulating display device that cost is low, this demonstration comprises centre wavelength value and waveform.Be that a centralized procurement integrates, the novel portable optical measurement instrument of storage, demonstration, analysis and processing capacity.Be a kind of measuring accuracy height, utility model that cost is low.The user not only can measure in this locality, also can control on remote computer and the parameter analysis.
The utility model mainly is made up of the two large divisions, the demonstration of separating the mediation waveform signal of transducing signal.At first be the demodulation of transducing signal: the broadband light that the wideband light source in the detuner sends is sent to the fiber grating probe through coupling mechanism, is reflected by the fiber grating probe again, becomes several narrow-band spectrum, turns back in the detuner through coupling mechanism again.Detuner is finished the demodulation of optic fiber grating wavelength, is the demonstration of waveform signal in addition: the lightwave signal that demodulates is finished the demonstration of fiber grating waveform signal simultaneously through data acquisition module, display processor, trace storer, the colored display module of LCD etc.
Comprised profuse information in the detected wavelength data, be used for showing that the very effective form of these data is exactly that waveform shows.
The data acquisition module of analog channel is mainly finished signal condition and the simulating signal of importing is transformed to digital quantity.Display processor carries out signal and waveform processing, is the core that waveform shows, mainly carries out digital filtering, interpolation, the waveform computing, analyzing and processing etc., the discrete data-signal that phase is weekly sampled reverts to complete tested waveform signal and deposits the trace wave memorizer in.Intuitively the signal and the waveform of optical fiber grating sensing are shown again by the colour liquid crystal display device image again.
Under many circumstances, we need be detected number of wavelengths reportedly toward PC, and in other cases, we may wish to come wavelength data is controlled with PC, and both of these case all requires " optical fiber grating sensing and demodulating display device " to have ability to communicate.That is to say, communication hardware and support software thereof must be housed.Here RS232/485, two kinds of interfaces of LAN (Local Area Network) have been adopted.
The built-in system software of " optical fiber grating sensing and demodulating display device " is mainly by collection, the demodulation of transducing signal, the collection of Wave data, the measurement of waveform parameter, parameter demodulation, the digital filtering of transducing signal, interpolation, the waveform computing, analyzing and processing, display driver, data communication and compositions such as waveform storage and playback.The mediation of separating that has realized fiber grating sensing signal shows, and close friend's the human-computer interaction interface of being convenient to operate is provided for the user.
" optical fiber grating sensing and demodulating display device " is the basic equipment and the core component of grating measuring.
Should " optical fiber grating sensing and demodulating display device " have highly sensitive, tuning range big, structure is simple relatively, cost is low, display is directly perceived, use is reliable and stable, be easy to characteristics such as making.
Have the characteristic of explosion-proof, the no fax sense of essence, chemically stable, long transmission distance, the information direct coding that grating sensor returns becomes wavelength, has broken through the existing measurement capability of portable apparatus.Can be used for the absolute measurement of parameter to external world.
According to pleasant scientific principle opinion, the digital oscilloscope technology is engaged with the fiber grating measuring technique, utilize numeral and graphics mode various field datas of stratified demonstration on LCD, requirement and custom according to managerial personnel, from chart and data, in time understand on-the-spot state, realized concentrated supervision and unified management.Broken the conventional thought of simple detection.
Possesses complete interconnection capability.It is integrated multiple electronics and data communication standard, the output of data is adopted RS232/RS485, two kinds of interfaces of LAN (Local Area Network) with communicating by letter of front end.Information sharing between the distributed sensing measurement of realization multiple spot and a plurality of collector and concentrated.
Description of drawings
Fig. 1 system architecture synoptic diagram of the present utility model
Embodiment
Referring to shown in Figure 1, adopting four fiber grating probes 1 to be connected in series with fiber coupler 2 in the present embodiment links to each other, fiber coupler 2 links to each other with sensing and demodulating device 3 by optical fiber, two other port of sensing and demodulating device 3, be connected with data acquisition module 4, display processor 5 usefulness leads respectively, data acquisition module 4 is connected with display processor 5 usefulness leads, have 7 ports on the display processor 5, other 5 ports respectively with trace storer 6, LCD colored display module 7, keyboard and encode 8, PC interface 9, lan interfaces 10 usefulness leads is connected.The broadband light that wideband light source in the sensing and demodulating device 3 sends is sent to four fiber grating probes 1 that are serially connected through fiber coupler 2, reflect by four fiber grating probes 1 again, become several narrow-band spectrum, the characteristic wavelength that process sensing and demodulating device 3 is measured fiber grating is finished the demodulation of fiber grating sensing signal, the fiber grating signature waveform signal that demodulates simultaneously, be input to display processor 5 through data acquisition module 4, the discrete data-signal that phase is weekly sampled reverts to complete tested waveform signal and deposits trace storer 6 in, finishes separating of fiber grating sensing signal by display processor 5 and instrument with LCD color monitor 7 grades again and is in harmonious proportion demonstration.Integrated multiple electronics and data communication standard in the system are by PC interface 9, lan interfaces 10, finish the communication with PC and far-end computer.The keyboard and 8 man-machine interactive operation that system is provided of encoding.
The mediation of separating in real time that present embodiment has not only been finished external fiber grating shows (comprising centre wavelength value and waveform), and can realize the measurement of sensing temperature, and the pass of detected grating wavelength and temperature T is:
D
11, D
12Be the intermediate value of master grating, calculate the coefficient of demarcating grating in view of the above, calculate temperature afterwards again.
aX+b＝T
A among the aX+b=T (slope) and b (side-play amount) wherein X are formula result of calculation, and T represents temperature.
Claims (1)
1. optical fiber grating sensing and demodulating display device, link to each other with fiber coupler (2) by at least one fiber grating probe (1), fiber coupler (2) links to each other with sensing and demodulating device (3) by optical fiber, it is characterized in that: also connect a waveform oscilloscope in the operating wavelength range of described fiber grating probe on the described sensing and demodulating device (3), described sensing and demodulating device (3) respectively with data acquisition module (4), display processor (5) connects with lead, described data acquisition module (4) is connected with lead with described display processor (5), other port of display processor (5) respectively with trace storer (6), the colored display module (7) of LCD, keyboard and coding (8), PC interface (9), lan interfaces (10) connects with lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520111897 CN2807227Y (en) | 2005-07-16 | 2005-07-16 | Optical fiber grating sensing and demodulating display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520111897 CN2807227Y (en) | 2005-07-16 | 2005-07-16 | Optical fiber grating sensing and demodulating display device |
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| Publication Number | Publication Date |
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| CN2807227Y true CN2807227Y (en) | 2006-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520111897 Expired - Lifetime CN2807227Y (en) | 2005-07-16 | 2005-07-16 | Optical fiber grating sensing and demodulating display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109392A (en) * | 2010-12-07 | 2011-06-29 | 上海申瑞电力科技股份有限公司 | Embedding type fiber bragg grating temperature measuring device |
-
2005
- 2005-07-16 CN CN 200520111897 patent/CN2807227Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109392A (en) * | 2010-12-07 | 2011-06-29 | 上海申瑞电力科技股份有限公司 | Embedding type fiber bragg grating temperature measuring device |
| CN102109392B (en) * | 2010-12-07 | 2014-04-16 | 上海申瑞继保电气有限公司 | Embedding type fiber bragg grating temperature measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150716 Granted publication date: 20060816 |
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| EXPY | Termination of patent right or utility model |