CN1888884A - Optical fiber grating solid material thermal expansion coefficient testing device - Google Patents
Optical fiber grating solid material thermal expansion coefficient testing device Download PDFInfo
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- CN1888884A CN1888884A CN 200610028965 CN200610028965A CN1888884A CN 1888884 A CN1888884 A CN 1888884A CN 200610028965 CN200610028965 CN 200610028965 CN 200610028965 A CN200610028965 A CN 200610028965A CN 1888884 A CN1888884 A CN 1888884A
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- fiber grating
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Abstract
An optical fiber raster solid material heat expand coefficient test method relates to one laser source. The fan-out of the laser source connects with the first ending of the optical fiber coupling implement. The third ending of the latter connects with optical fiber raster wavelength demodulation module at first and then the photoelectric conversion module, data collection equipment and industrial control computer and they set in housing. The optical fiber raster sensor head, tested material stick timber and self-controlled high temperature stove make up into a optical fiber raster solid material heat expand sensor institution. Epoxy polyester fixes with optical fiber to both ending of the sensor raster on the free ending's casting isinglass of the tested material stick timber and the casting isinglass of the flange tray to make the said optical fiber raster sensor head. The said tested material stick timber fixes inside the self-controlled high temperature stove. The second ending to the said optical fiber coupling implement connects with the optical fiber to the said sensor raster. It can test heat expand coefficient in high temperature condition with high dependability, low cost and quick test speed.
Description
Technical field
The present invention relates to fiber grating, particularly a kind of optical fiber grating solid material thermal expansion coefficient testing device.Be mainly used in the test calibration of different solid material thermal linear expansion coefficients.
Background technology
Thermal expansivity is in order to show the build-in attribute of the temperature distortion of material own.Thermal expansivity is the important parameter that must consider in engineering design, exact instrument manufacturing, material welding and the processing, again because thermal expansivity is the function of temperature, its concrete numerical value can change along with variation of temperature, will bring tangible error iff adopting on the handbook given average coefficient of linear expansion to carry out designing and calculating.For high-accuracy Machine Design, must by actual measurement under the uniform temperature condition detected materials thermal expansivity, just can obtain definite design data reliably.
The method of test solid material thermal expansion coefficient has at present: optical lever method, moire method, splitter method, laser scanning micrometry, electronic speckle method and fiber grating method or the like.We find that prior art is all existing intrinsic defective and deficiency in varying degrees.For example: the temperature range of optical lever method test is little, and resolution is low; Moire method requires at the accurate grating of test surfaces etching, the technological requirement height, and also high to the quality requirement of test specimen, its light path requires complicated simultaneously; Laser scanning micrometry and electronic speckle method are had relatively high expectations to experiment porch, a little less than the antijamming capability; Existing fiber grating method, grating is fixed in the test specimen surface to be heated together, a kind of method has been considered grating thermal expansion effects and thermo-optic effect in theory, another kind method plates the thermal expansion effects of metal coating with compensated optical fiber on one section optical fiber on grating next door, though these two kinds of schemes have all guaranteed the precision of test substantially, but grating is heated with test specimen, can not realize the test of high temperature section, and certainly will will influence the mission life of grating.
Summary of the invention
The present invention is directed to defective and deficiency that prior art exists, propose a kind of optical fiber grating solid material thermal expansion coefficient testing device, this device can be realized the thermal expansivity test under the condition of high temperature, has advantages such as reliability height, cost is low, measuring speed is fast.
Technical solution of the present invention is as follows:
A kind of optical fiber grating solid material thermal expansion coefficient testing device comprises:
First end of the output termination fiber coupler of one LASER Light Source, this LASER Light Source, the 3rd terminated optical fiber grating wavelength demodulation module of this fiber coupler is connected in series photoelectric conversion module, data acquisition equipment and industrial computer more successively and is arranged in the casing; Form the optical fiber grating solid material thermal expansion sensing mechanism by optical fiber grating sensing head, detected materials bar and controllable high temperature furnace, described optical fiber grating sensing head is fixed on the free-ended casting mica of detected materials bar with epoxy polyester with the optical fiber at sensing grating two ends and is fixed on the casting mica on the ring flange and constitutes, and described detected materials bar is fixed in the controllable high temperature furnace chamber; The optical fiber of the described sensing grating of second termination of described fiber coupler.
Principle of work of the present invention is:
Be fixed on the detected materials bar expanded by heating in the controllable high temperature furnace furnace chamber, owing to an end of detected materials rod is fixed, so the back detected materials rod that is heated expands to free end.Fiber grating is fixed on the free-ended casting mica of detected materials rod and is fixed on the casting mica on the ring flange, and detected materials rod expanded by heating and then stretching optical fiber grating, the centre wavelength drift value Δ λ of fiber grating are by following formulate:
ΔL＝αL (2)
λ wherein
BBe fiber grating centre wavelength, P
eBe effective elasto-optical coefficient, Δ L is the elongation of bar, L
fBe the fiber lengths (comprising grating) between two point of fixity, α is the thermal linear expansion coefficient of material, and L is the length of bar, so can get:
Hence one can see that, as long as demodulate the centre wavelength drift value Δ λ of fiber grating
B, promptly can try to achieve the thermal linear expansion coefficient of this solid material by formula 3.
The advantage that the present invention gives prominence to is:
1. avoid sensing grating to heat, realized the possibility of thermal expansivity test under the condition of high temperature, and guaranteed the mission life of grating with test specimen.
2. can realize that the test of the temperature range of any setting being carried out thermal expansivity shows
3, Fiber Bragg Grating technology maturation, stable performance, cheap, be easy to apply.
Description of drawings
Fig. 1 is the structural drawing of optical fiber grating solid material thermal expansion coefficient testing device of the present invention
Fig. 2 is an optical fiber grating solid material thermal expansion sensing mechanism structural drawing in apparatus of the present invention
Among the figure: 1-LASER Light Source, 2-fiber coupler, 3-optical fiber grating solid material thermal expansion sensing mechanism, 4-optic fiber grating wavelength demodulation module, 5-photoelectric conversion module, 6-data acquisition equipment, 7-industrial computer, 8-casing, 9-controllable high temperature furnace, 10-detected materials bar, 11-optical fiber grating sensing head, 12-furnace chamber, 13-heating wire, 14-ring flange, 15-heat-protecting glass sleeve pipe, 16-casting mica, 17-casting mica, 18-sensing grating, 19-pottery mica sheet, 20-epoxy polyester point of fixity.
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
See also Fig. 1 and Fig. 2 earlier, as seen from the figure, optical fiber grating solid material thermal expansion coefficient testing device of the present invention comprises:
One LASER Light Source 1, first end 21 of the output termination fiber coupler 2 of this LASER Light Source 1, the 3rd end 23 of this fiber coupler 2 connects optic fiber grating wavelength demodulation module 4, is connected in series photoelectric conversion module 5, data acquisition equipment 6 and industrial computer 7 more successively and is arranged in the casing 8; Form optical fiber grating solid material thermal expansion coefficient sensing mechanism 3 by optical fiber grating sensing head 11, detected materials rod 10 and controllable high temperature furnace 9, described optical fiber grating sensing head 11 is the two ends of sensing grating 18 to be fixed on detected materials bar 10 free-ended casting micas 16 and to be fixed on the casting mica 17 on the ring flange with epoxy polyester 20 to constitute, and described detected materials rod 10 is fixed in the furnace chamber 12 of controllable high temperature furnace 9; Second end 22 of described fiber coupler 2 connects the optical fiber of described sensing grating 18.
Controllable high temperature furnace 9 gives furnace chamber 12 heating to heat up or to keep temperature by heating wire 13; Detected materials rod 10 is fixed in the furnace chamber 12 by ceramic mica sheet 19; Heat-protecting glass sleeve pipe 15 is enclosed within the outside of detected materials rod 10, and its effect is that outer part bar of furnace chamber and the part bar in the furnace chamber are in together under the temperature field; The end face that is fixed on detected materials rod 10 free-ended casting micas 16 will keep in one plane with the end face that is fixed on the casting mica 17 on the ring flange, only in this way could guarantee that the fiber grating that is fixed in the above only is subjected to axial stress and stressed even.
Because an end of detected materials rod 10 is fixed, back detected materials rod expands to free end so be heated, thereby stretching optical fiber grating, make centre wavelength produce drift, optic fiber grating wavelength demodulation module 4 is demodulated to described wave length shift the variation of light intensity value, photoelectric conversion module 5 is converted into magnitude of voltage with light intensity value, data acquisition equipment 6 is converted into this magnitude of voltage digital quantity and sends it to industrial computer 7, by calculating the drift value that can obtain centre wavelength, just can calculate the thermal linear expansion coefficient of detected materials again by formula 3, and show by the display screen of industrial computer.
Apparatus of the present invention are tested so can realize the thermal linear expansion coefficient under the condition of high temperature, and are had advantages such as reliability height, cost is low, measuring speed is fast owing to place high-temperature outside the venue sensing grating.
Claims (1)
1, a kind of optical fiber grating solid material thermal expansion coefficient testing device is characterized in that comprising:
First end (21) of the output termination fiber coupler (2) of one LASER Light Source (1), this LASER Light Source (1), the 3rd end (23) of this fiber coupler (2) connects optic fiber grating wavelength demodulation module (4), is connected in series photoelectric conversion module (5), data acquisition equipment (6) and industrial computer (7) more successively and is arranged in the casing (8);
Form optical fiber grating solid material thermal expansion sensing mechanism (3) by optical fiber grating sensing head (11), detected materials bar (10) and controllable high temperature furnace (9), described optical fiber grating sensing head (11) is the two ends of sensing grating (18) to be fixed on the free-ended casting mica of detected materials bar (10) (16) and to be fixed on casting mica (17) on the ring flange with epoxy polyester (20) to go up and constitute, and described detected materials bar (10) is fixed in the furnace chamber (12) of controllable high temperature furnace (9);
Second end (22) of described fiber coupler (2) connects the optical fiber of described sensing grating (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100289657A CN100538350C (en) | 2006-07-14 | 2006-07-14 | Optical fiber grating solid material thermal expansion coefficient testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100289657A CN100538350C (en) | 2006-07-14 | 2006-07-14 | Optical fiber grating solid material thermal expansion coefficient testing device |
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| CN1888884A true CN1888884A (en) | 2007-01-03 |
| CN100538350C CN100538350C (en) | 2009-09-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217454A (en) * | 2013-03-22 | 2013-07-24 | 南京航空航天大学 | Fiber bragg grating measurement system and method for cylindrical structure thermal diffusivity |
| CN105783751A (en) * | 2014-12-17 | 2016-07-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for testing supporting point vector deformation under multi-field coupling |
| CN111272804A (en) * | 2020-03-12 | 2020-06-12 | 陕西科技大学 | Device and method for measuring enamel linear thermal expansion coefficient in ceramic based on grating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMO20010248A1 (en) * | 2001-12-12 | 2003-06-12 | Expert System Solutions Srl | PERFECTED OPTICAL DILATOMETER |
| CN100340839C (en) * | 2005-09-27 | 2007-10-03 | 天津大学 | Fibre-optical strain measuring device and method thereof |
| CN2924529Y (en) * | 2006-07-14 | 2007-07-18 | 中国科学院上海光学精密机械研究所 | Optical fiber grating solid material thermal expansion coefficient measuring device |
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2006
- 2006-07-14 CN CNB2006100289657A patent/CN100538350C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217454A (en) * | 2013-03-22 | 2013-07-24 | 南京航空航天大学 | Fiber bragg grating measurement system and method for cylindrical structure thermal diffusivity |
| CN105783751A (en) * | 2014-12-17 | 2016-07-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for testing supporting point vector deformation under multi-field coupling |
| CN105783751B (en) * | 2014-12-17 | 2018-12-18 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of multi- scenarios method state lower fulcrum vector deformation test method |
| CN111272804A (en) * | 2020-03-12 | 2020-06-12 | 陕西科技大学 | Device and method for measuring enamel linear thermal expansion coefficient in ceramic based on grating |
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| Publication number | Publication date |
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| CN100538350C (en) | 2009-09-09 |
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