CN202188925U - Intensity coding type fiber grating temperature monitoring alarm system - Google Patents
Intensity coding type fiber grating temperature monitoring alarm system Download PDFInfo
- Publication number
- CN202188925U CN202188925U CN2010206957288U CN201020695728U CN202188925U CN 202188925 U CN202188925 U CN 202188925U CN 2010206957288 U CN2010206957288 U CN 2010206957288U CN 201020695728 U CN201020695728 U CN 201020695728U CN 202188925 U CN202188925 U CN 202188925U
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- fiber grating
- alarm system
- temperature
- temperature monitoring
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Abstract
The utility model relates to an intensity coding type fiber grating temperature monitoring alarm system, belonging to the fiber sensing technology field. The intensity coding type fiber grating temperature monitoring alarm system is composed of a broadband light source, a Y-shaped optical splitter, fiber gratings of which the reflectivity has a gradient change and the reflection wavelengths are same, a tunable filter, an optical detector and corresponding fibers and leads, and can be used for temperature monitoring and fire hazard alarm. In the utility model, by a reflection signal intensity coding mode, the low cost advantage of an isotactic fiber grating temperature monitoring alarm system is retained, and the defect is avoided that the concrete fiber grating can not be positioned; and when a greater temperature change occurs to alarm, the concrete fiber grating generating the temperature change or the alarm signal in a monitoring area can be positioned, so that the intensity coding type fiber grating temperature monitoring alarm system is more advantaged. By using the intensity coding type fiber grating temperature monitoring alarm system of the utility model, the monitoring alarm temperature is usually below 200 DEG C, but if special materials or processed fiber gratings are used, the highest monitoring temperature can reach 500 DEG C.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is a kind of novel optical fiber and optical grating multi-point temp monitor and alarm system simultaneously.
Background technology
In industries such as oil, chemical industry, rock gas, the energy, be and important that the too high meeting of temperature sometimes causes accidents such as burning, blast, thereby causes the loss of life, property to the monitoring of temperature.Therefore, the real time monitoring of temperature has great application demand.
Traditional temperature monitoring technology is many based on the electromagnetic sensor system, is used for the fashionable unsafe factors that exist in field such as inflammable and explosive, and receive electromagnetic wave easily, the interference of extraneous factor such as humidity.The temperature monitoring system that utilizes fiber grating to make then have essential safety, anti-electromagnetic interference (EMI), anti-moist, anticorrosive, volume is little, advantage such as in light weight.At present, the optical fiber grating temperature-measuring technology mainly contain the optical fiber grating temperature-measuring technology of wavelength-division multiplex with entirely with optical fiber grating thermometry.Wavelength-division multiplex optical fiber grating temp measuring system is that the grating that utilizes wavelength-division multiplex technique on an optical fiber, to make a plurality of different reflection wavelengths carries out the multimetering of array; The signal demodulating apparatus of this system need carry out the length scanning (usually more than tens nanometer reaches) of relative broad range; Therefore cost an arm and a leg, be unfavorable in practical engineering application, promoting.And it is complete identical with the reflection wavelength of the fiber grating that adopts in the optical fiber grating temperature-measuring system; Therefore the demodulated equipment wavelength coverage that only need scan very narrow (1 to several nanometers) can realize the collection and the monitoring of signal; If only be used for reporting to the police then do not need length scanning, therefore reduced cost.But because the concrete fiber grating in the link can not be distinguished by system, whether one section zone therefore can only monitoring a plurality of fiber gratings distributions simultaneously has the temperature anomaly situation, and can not temperature variation or alarm set point be positioned.
Summary of the invention
The utility model adopts that a plurality of reflection wavelengths are identical, reflectivity different fibers grating is serially connected in and realizes temperature monitoring and warning in the optical fiber; The demodulated equipment that equally only needs wavelength scanning range very narrow (or fixed wave length), and can distinguish and locate fiber grating through the intensity of output signal.This system both provided cost savings, and had avoided can not locating with the optical fiber optical-mechanical system full the shortcoming of the particular location of temperature variation or warning again, therefore more had superiority.
Shown in accompanying drawing: wideband light source (1) links to each other with a branch road port of Y shape optical branching device (2) through optical fiber (7); The terminal fiber grating (3) that reflection wavelength is identical with optical fiber (7) is different with a plurality of reflectivity that closes of Y shape optical branching device (2) is connected in series; Another minute road port of Y shape optical branching device (2) is used up fibre (7) and is linked to each other with the input port of adjustable filter (4); The output terminal of adjustable filter (4) links to each other with photo-detector (5) through optical fiber (7); The electric signal of photo-detector (5) links to each other with audible-visual annunciator (6) through lead (8).
The principle of work of the utility model is: the optically-coupled that wideband light source sent gets into optical fiber; Incide in the fiber grating that reflectivity is different, reflection wavelength is identical with the optical fiber serial connection through Y shape optical branching device; The co-wavelength fiber grating can optionally reflect a narrow band light, and the centre wavelength of narrow band light is the reflection wavelength of co-wavelength fiber grating.Narrowband reflection light is through another minute of Y shape optical branching device road port entering adjustable filter.The filter wavelength of adjustable filter is provided with a sweep limit by the requirement of reporting to the police, under normal condition, and when the reflection wavelength of fiber grating during less than the minimum value of the set length scanning of adjustable filter, the unglazed output of filtering output end mouth of adjustable filter; The residing environment temperature of any one fiber grating raises in link, and the reflection wavelength of this fiber grating will move to the long wave direction, gets into the set wavelength scanning range of adjustable filter, and adjustable filter produces light signal and is sent to photo-detector.Because the reflectivity of fiber grating is different; The light intensity that is the fiber grating reflection is different; So the different light intensity that detects according to photo-detector can specifically navigate to the fiber grating position that certain occurrence temperature changes; And the scanning wavelength when producing light signal according to wave filter comes the changing value of accounting temperature, thereby can reach the effect of real-time monitoring.When the reflection wavelength of fiber grating overlaps with the length scanning maximal value of adjustable filter setting (environment temperature reaches set alarming value); The filtering output end of adjustable filter has light output, triggers the audible-visual annunciator warning thereby photo-detector detects light signal.In a word, the utility model not only can be located the position that occurrence temperature changes, and can measure the temperature variation of this position.
Wideband light source is meant the light source of broadband greater than all fiber grating reflection wavelength maximum changing ranges in the link.The bandwidth of wideband light source only needs to use common light emitting diode to get final product once enough to several nanometers.
The fiber grating that reflectivity is different, reflection wavelength is identical is defined as in the optical fiber that is produced on commaterial, specification, remove the identical a plurality of fiber gratings of different other parameters of reflectivity; Each fiber grating reflectivity can be made as 5% according to the resolving accuracy of signal detection system, the fiber grating quantity factor decision of needs series connection at interval, and promptly reflectivity is followed successively by 5%; 10%; ..., 95% ,～100%.
Adjustable filter be meant filter wavelength within the specific limits the people for a change or the wave filter of autoscan, the certain limit here is meant: the maximum changing range of the pairing fiber grating reflection wavelength of temperature maximum changing range under the environment of detector place.
Audible-visual annunciator is meant the different light intensity that detects according to photo-detector, produces the alarm of unlike signal.
Y shape optical branching device, photo-detector and corresponding optical fiber, lead are to satisfy the commonplace components that systemic-function requires.
Description of drawings
Accompanying drawing is an intensity coding type optical fiber grating temperature monitor and alarm system principle schematic.
1: wideband light source; 2:Y shape optical branching device; 3: the fiber grating that reflectivity is different, reflection wavelength is identical; 4: adjustable filter; 5: photo-detector; 6: audible-visual annunciator; 7: optical fiber; 8: lead.
Embodiment:
Utilize special method in optical fiber, to make reflectivity graded, fiber grating that reflection wavelength is identical.Each fiber grating reflectivity at interval can be according to the resolving accuracy of signal detection system, factors such as the fiber grating quantity decision of needs series connection.Reflection wavelength value difference between each fiber grating is not determined by the error that actual monitoring allowed.
The fiber grating of making is installed in the place of actual needs monitoring; Be connected in series with optical fiber between each fiber grating; And insert the road port that closes of Y shape optical branching device; Two branch road ports of Y shape optical branching device connect wideband light source and adjustable filter with optical fiber respectively, and the filtering output end of adjustable filter inserts photo-detector through optical fiber, and the electric signal of photo-detector output connects sound and light alarm device through special circuit.Except the fiber grating of serial connection, other each several part of system can be integrated in the instrument container.
The temperature value that requires according to reporting to the police sets the filter wavelength of adjustable filter, and energized can be carried out temperature monitoring and warning to the fiber grating zone is installed.Through the filter wavelength of automatic or manual scanning adjustable filter, can carry out the real-time monitoring of temperature to the zone that fiber grating is installed.
Claims (1)
1. one kind based on intensity coding type optical fiber grating temperature monitor and alarm system; Comprise wideband light source (1), a Y shape optical branching device (2), a plurality of reflectivity difference and identical fiber grating (3), adjustable filter (4), photo-detector (5), audible-visual annunciator (6) and the corresponding optical fiber (7) and lead (8) of reflection wavelength, it is characterized in that wideband light source (1) passes through optical fiber (7) and links to each other with a branch road port of Y shape optical branching device (2); The terminal fiber grating (3) that reflection wavelength is identical with optical fiber (7) is different with a plurality of reflectivity that closes of Y shape optical branching device (2) is connected in series; Another minute road port of Y shape optical branching device (2) is used up fibre (7) and is linked to each other with the input port of adjustable filter (4); The output terminal of adjustable filter (4) links to each other with photo-detector (5) through optical fiber (7); The electric signal of photo-detector (5) links to each other with audible-visual annunciator (6) through lead (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206957288U CN202188925U (en) | 2010-12-29 | 2010-12-29 | Intensity coding type fiber grating temperature monitoring alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206957288U CN202188925U (en) | 2010-12-29 | 2010-12-29 | Intensity coding type fiber grating temperature monitoring alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202188925U true CN202188925U (en) | 2012-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206957288U Expired - Fee Related CN202188925U (en) | 2010-12-29 | 2010-12-29 | Intensity coding type fiber grating temperature monitoring alarm system |
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| CN (1) | CN202188925U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167872A (en) * | 2017-05-05 | 2017-09-15 | 薛鹏 | Fiber grating code set knows method for distinguishing |
| CN111982347A (en) * | 2020-07-07 | 2020-11-24 | 傲普(上海)新能源有限公司 | FBG temperature measurement method suitable for energy storage battery |
-
2010
- 2010-12-29 CN CN2010206957288U patent/CN202188925U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167872A (en) * | 2017-05-05 | 2017-09-15 | 薛鹏 | Fiber grating code set knows method for distinguishing |
| CN111982347A (en) * | 2020-07-07 | 2020-11-24 | 傲普(上海)新能源有限公司 | FBG temperature measurement method suitable for energy storage battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20120411 Termination date: 20151229 |
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| EXPY | Termination of patent right or utility model |