CN100387972C - Eliminating method of inertial deviation in optical fiber sensing corrosion detecting aluminium material - Google Patents
Eliminating method of inertial deviation in optical fiber sensing corrosion detecting aluminium material Download PDFInfo
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- CN100387972C CN100387972C CNB2005100443284A CN200510044328A CN100387972C CN 100387972 C CN100387972 C CN 100387972C CN B2005100443284 A CNB2005100443284 A CN B2005100443284A CN 200510044328 A CN200510044328 A CN 200510044328A CN 100387972 C CN100387972 C CN 100387972C
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Abstract
The invention relates to a method to avoid the initial error for fiber sensor corrosion testing aluminum material. It includes the following steps: selecting a normal communication fiber, removing fiber sheath and coating layer, removing cladding by hydrofluoric acid and making fiber core diameter reach 50-60um, making fiber core aluminum metal sensitive film and boiling the coating fiber, taking sealing process for 30-180min to make the aluminum metal sensitive film expand to decrease the surface Millipore quality on surface and decrease initial error. It can ensure the accuracy of testing result.
Description
Technical field:
The invention belongs to the optical fiber sensing corrosion monitoring technical field, be used for eliminating the initial error that corrosion detects metal material, the specifically removing method of inertial deviation in optical fiber sensing corrosion detecting aluminium material.
Technical background:
The extended active duty phenomenon of ship-board aircraft commonly used is serious at present, and the corrosion monitoring at its aircraft skin structure place is essential.In marine environment, corrosion of metal monitoring mostly is visual detection, and when the corrosion of metal phenomenon can be found, its corrosion thickness had reached 10% of original metal layer thickness, lose quite seriously, and the repair of this moment is also relatively more difficult.This visual detection method expends great amount of manpower and material resources, and the dismounting inspection that corrosion location does not particularly take place also can destroy the integrality of original material and reduce structural strength, causes unnecessary waste.This visual detection can't realize that original position monitors in real time.Existing many occasions utilize ultrasonic method to detect the metal erosion performance, but the ultrasonic investigation method is difficult to differentiation corrosion product and original metal layer thickness, very easily cause and detect error.
Compare with classic method, optical fiber has volume little (fibre diameter is less than 150 μ m), in light weight, wide coverage, advantage that the data message amount is big, and shape is flexible, durable in use, can bend to multiple shape according to concrete operating mode needs, not only time saving and energy saving, and anti-electromagnetic interference (EMI).The advantage of optical fiber itself has caused many superiority of optical fiber sensing technology, is widely used in a lot of fields.There has been the scientific research personnel to develop the corrosion monitoring process of Fibre Optical Sensor aluminum, but thisly there is tangible initial error when utilizing optical fiber sensing technology to detect the aluminum corrosion, and this error is difficult for being eliminated in the ordinary course of things, up to the present, yet there are no the method that solves this error of reporting.
Summary of the invention:
The objective of the invention is to method, eliminate the initial error that exists when detecting the aluminum corrosion phenomenon, guarantee the accuracy of measuring with optical fiber sensing technology and sealing processing.
Method of the present invention comprises preparation aluminum metallic sensing film and two basic processes of sealing processing, and its step is as follows:
(1) choose 50 centimetres of commercially available communication optical fibers, its inside and outside core diameter size is respectively 62.5/125 μ m, and the structure of its optical fiber is fibre core, covering, overlay and sheath from inside to outside successively;
(2) remove optical fiber jacket and overlay with conventional process and instrument, again with exposed covering and core segment hydrofluorite erosion removal covering; Its concrete grammar is: in concentration is immersion corrosion in the hydrofluoric acid solution of 5%-30%, uses spiral dial gauge (0-25mm range, resolution are 0.01mm) constantly to monitor core diameter simultaneously, till its diameter reaches 50-60 μ m.Fibre core diameter is excessive, influences metal film corrosion monitoring effect; Fibre core diameter is too small, and fiber strength is too low, and frangibility is so should get hold of the diameter of fiber core in processing procedure;
(3) with pellet Films Prepared with Vacuum Evaporation Deposition aluminum metallic sensing film.Select conventional vacuum evaporation plating machine for use, aluminium is a target, and electrical current is 3-300A, and initial depression is 10 before the last sample
-4Pa;
(4) vacuum deposition method prepares the aluminum metallic sensing film at optical fiber surface, in sodium hydroxide solution, carry out simulative corrosion test, its experimental system setup comprises transducing part, corrosive liquid, light power meter and the computing machine etc. of light source, optical fiber, optical fiber, through this systematic procedure and corrosion of equipment, record corrosion sensing curve as shown in Figure 2.
(5) from the experimental result curve of gained as can be seen, the initial landing of power detection part is about 0.04uW, changes nearly 0.13uW and the corrosion process luminous power is overall, initial landing account for that overall optical power changes about 30%, this error can not be ignored.
(6) in order to eliminate this error, the optical fiber that is coated with the aluminum sensitive membrane to be boiled in water do sealing and handle, the processing time makes the surface metal sensitive membrane expand in 30 minutes to 180 minutes scopes, eliminates micropore, reduces initial error;
(7) can illustrate that from the change curve that seals the fiber optical corrosive through-put power after handling initial error is eliminated substantially through after this processing.
After the aluminum metal film of optical fiber surface was handled through above-mentioned sealing, micropore quantity obviously reduced, and the initial error of optical output power curve disappears substantially, has guaranteed the accuracy of measurement result.
Description of drawings:
Fig. 1 is fiber optical corrosive monitoring simulation corrosion process principle schematic.
Fig. 2 is a corrosion process Optical Fiber Transmission function rate change curve.
Fig. 3 handles the curve map of post-etching process Optical Fiber Transmission variable power for sealing.
Specific embodiments:
In the enforcement of the present invention, its fiber optical corrosive monitoring simulation corrosion process is finished in the system equipment that a combine and assemble forms, and this system equipment comprises that light source 1, optical fiber 2, transducing part 3, corrosive liquid 4, light power meter 5 and digital processing computing machine 6 are communicated with the system that can realize corrosion process that combines by principle of work.
The skin of optical fiber is overlay and sheath, and main effect is a protection optical fiber, improves physical strength, avoids fractureing and isolating veiling glare.Internal layer is fibre core and covering, and this is the main body of optical fiber structure, and the propagation of light wave is played decisive role.Light is propagated in fiber core, and its material principal ingredient is a silicon dioxide, and the micro-other materials that also mixes is to improve the light refractive index of fibre core.The principal ingredient of covering also is a silicon dioxide, and just the material that adds is in order to reduce the light refractive index of covering, to propagate to realize the total reflection of optical signalling in fiber core.
When corrosion took place the optical fiber surface metallic sensing film, optical fiber one end that has metal film connected light source, and the other end connects light power meter, and the corrosion process of the metallic sensing film of optical fiber surface is noted by the curve of output of luminous power.The initial landing of curve causes owing to the aluminum surface micropore, and occupies suitable ratio in overall power changes, and can not be ignored.
Experimental result shows that after optical fiber surface aluminum sensitive membrane was handled through sealing, surface micropore had disappeared, the initial landing of light curve of output also disappears thereupon, and optical detection more accurately and reliably.
Embodiment 1:
Get 50 centimetres of commercially available conventional fibers, remove protective seam and overlay, in 10% hydrofluoric acid solution, soak and removed covering (core diameter reaches 52.5 μ m) in 1 hour; It is to take out after target deposition aluminium lamination formed the aluminum metallic sensing film in 30 minutes that the optical fiber of removing covering is placed in the vacuum evaporation plating machine with aluminium; Optical fiber with vacuum deposited metal aluminum sensitive membrane boiled 60 minutes in 100 ℃ of water then, put into fiber optical corrosive monitoring simulation corrosion experimental device and carry out the optical detection of corrosion process, testing result can show in the change curve of sealing processing post-etching process Optical Fiber Transmission power; Consequently the Output optical power initial error disappears, and the sealing process of optical fiber surface aluminum sensitive membrane is tangible.
The selected equipment of vacuum deposition method in this example is target for the JEE-4x type vacuum evaporation plating machine that NEC company produces with aluminium, and electrical current is 200A, and the preceding initial depression of last sample is 10
-4Pa; It promptly is that the optical fiber of vacuum deposited metal aluminum sensitive membrane was boiled 60 minutes in 100 ℃ in boiling water that said sealing is handled, and accompanying drawing 2 and accompanying drawing 3 demonstrate the curve map of effect of the present invention respectively.
Claims (3)
1. the removing method of an inertial deviation in optical fiber sensing corrosion detecting aluminium material, it is characterized in that removing optical fiber jacket and overlay, more exposed covering and fibre core are reached 50-60 μ m with hydrofluoric acid solution immersion corrosion removal covering to core diameter with conventional process and instrument; Using conventional vacuum evaporation plating machine again, is target with aluminium, passes to electric current, and initial depression is 10
-4The condition of Pa prepares the aluminum sensitive membrane; The optical fiber that will be coated with the aluminum sensitive membrane again boils to seal in water to be handled in 30 minutes to 180 minutes scopes, and its surface metal sensitive membrane is expanded, and eliminates micropore, reduces initial error.
2. the removing method of inertial deviation in optical fiber sensing corrosion detecting aluminium material according to claim 1 is characterized in that used hydrofluoric acid solution concentration is 5%-30%; The electrical current 3-300A of vacuum evaporation plating machine.
3. the removing method of inertial deviation in optical fiber sensing corrosion detecting aluminium material according to claim 1, it is characterized in that preparing the aluminum metallic sensing film at optical fiber surface, carry out simulative corrosion test in sodium hydroxide solution, its system and device comprises transducing part, corrosive liquid, light power meter and the computing machine of light source, optical fiber, optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100443284A CN100387972C (en) | 2005-07-29 | 2005-07-29 | Eliminating method of inertial deviation in optical fiber sensing corrosion detecting aluminium material |
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| CNB2005100443284A CN100387972C (en) | 2005-07-29 | 2005-07-29 | Eliminating method of inertial deviation in optical fiber sensing corrosion detecting aluminium material |
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| CN1904587A CN1904587A (en) | 2007-01-31 |
| CN100387972C true CN100387972C (en) | 2008-05-14 |
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| CN105987876A (en) * | 2015-02-06 | 2016-10-05 | 中国人民解放军空军第航空学院 | Grid-region direct-coating FBG sensor for detecting aluminum corrosion and method thereof |
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