CN107884408A - Phase transition temperature tester and its method of testing - Google Patents
Phase transition temperature tester and its method of testing Download PDFInfo
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- CN107884408A CN107884408A CN201610871613.1A CN201610871613A CN107884408A CN 107884408 A CN107884408 A CN 107884408A CN 201610871613 A CN201610871613 A CN 201610871613A CN 107884408 A CN107884408 A CN 107884408A
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- 230000007704 transition Effects 0.000 title claims abstract description 42
- 238000010998 test method Methods 0.000 title abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 56
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 230000033001 locomotion Effects 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 229910001000 nickel titanium Inorganic materials 0.000 claims abstract description 10
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 29
- 230000009466 transformation Effects 0.000 claims description 10
- 239000012085 test solution Substances 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 5
- 241001212149 Cathetus Species 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8405—Application to two-phase or mixed materials, e.g. gas dissolved in liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8472—Investigation of composite materials
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a kind of phase transition temperature tester and its method of testing.Wherein, phase transition temperature tester includes：For accommodating the container of sample；Heater, the sample in the container is heated；Image acquiring device, for obtaining the image of sample；Temperature sensor, it is connected with the container, for detecting the temperature change of the sample；Processor, it is connected with described image acquisition device and temperature sensor electronics, for performing following processing：The change in displacement according to caused by the image detection sample of acquisition due to heating, and according to the temperature movement curve of change in displacement and temperature change the generation sample detected.Phase transition temperature tester provided by the present invention and its method of testing realize the non-contact measurement to Nitinol phase transition temperature, the nick-eltitanium alloy stent of any specification and shape type accurately can be tested, and applicability is wide.
Description
Technical field
The present invention relates to a kind of phase transition temperature tester, more particularly to a kind of phase transition temperature for being used to detect Nitinol
Contactless phase transition temperature tester and its method of testing.
Background technology
In existing practice, the method for generally use artificial judgment tests the phase transition temperature A of NitinolSAnd AF, but so
The degree of accuracy of test is not high and workload is big.Therefore, have developed in recent years can realize automatic detection AFContact phase transformation
Temperature measuring device, i.e., detect the change in shape that it is varied with temperature by contacting Nitinol.But for millimetre-sized small
Nick-eltitanium alloy stent, contact phase transition temperature tester has limitation, can be deposited between its position sensor and detected rod
In mechanical friction error, it is difficult to carry out accurate measurement to small nick-eltitanium alloy stent.
The content of the invention
Contactless phase transition temperature A can be accurately detected it is an object of the invention to provide a kind ofSAnd AFPhase transition temperature
Tester.
To achieve these goals, phase transition temperature tester provided by the invention, including：For accommodating the appearance of sample
Device；Heater, the sample in the container is heated；Image acquiring device, for obtaining the figure of sample
Picture；Temperature sensor, it is connected with the container, for detecting the temperature change of the sample；And processor, it is and described
Image acquiring device connects with temperature sensor electronics, for performing following processing：According to the image detection sample of acquisition
Due to change in displacement caused by heating, and according to the temperature movement of change in displacement and temperature change the generation sample detected
Curve.
In some embodiments, described image acquisition device includes：Camera, for shooting sample to obtain quilt
The image of test sample product；And supporting mechanism, for camera to be supported on into camera site to be shot to sample.It is optional
Ground, the supporting mechanism can include：Support base；And position adjusting mechanism, it is arranged on support base, suitable for being taken the photograph described in adjustment
As the camera site of head.Wherein, the position adjusting mechanism can include：Guide rail, set along the vertical direction in the support base
Put；And sliding part, the camera are fixed with the sliding part, and the sliding part is engaged with the guide rail so that described take the photograph
As head can move along the guide rail.
In a preferred embodiment, the position adjusting mechanism may also include：Drive mechanism, the drive mechanism and cunning
Moving part is engaged to drive the sliding part to be moved along the guide rail.Preferably, the drive mechanism is linear electric motors.The straight line
Motor is located at the bottom of the phase transition temperature tester.
In some embodiments, the phase transition temperature tester may also include holding said container, heater, image
The cover body of acquisition device and temperature sensor, wherein, the cover body have make container, heater, pickup camera and TEMP
The visible opening of device and the sliding door for opening or closing the opening.Preferably, the sliding door is arranged to 180 degree and may move.It is excellent
Selection of land, rotating mechanism is provided between the sliding door and cover body, by rotating the rotating mechanism with the movement sliding door.
In some embodiments, the sample can be nick-eltitanium alloy stent.
Present invention also offers the method tested using above-mentioned phase transition temperature tester sample, this method bag
Include following steps：A. the sample in container is heated；B. the image of sample is obtained, detects the sample
Temperature change；C. the change in displacement according to caused by the image detection sample of acquisition due to heating, and according to detecting
Change in displacement and temperature change generation temperature movement curve, obtain transformation temperature.In a preferred embodiment, in the container
Test solution with immersion sample, also, step a includes：Sample is carried out by heating the test solution
Heating.
In some embodiments, sample is detected because change in displacement caused by heating includes：Obtain and determine institute
Multiple characteristic points in the image of the sample of acquisition are stated, track the multiple characteristic point because position caused by heating changes
Become, the length between the multiple characteristic point after the change of calculation position, so as to obtain the change in displacement of the sample.It is excellent
Selection of land, it can be obtained by Harris Corner Detection Algorithms and determine the multiple characteristic point, track the multiple characteristic point
The length between the multiple characteristic point after position change and calculation position change.Wherein, described image is gray level image.
In some embodiments, the sample is that elongated rails, methods described are also wrapped made of Nitinol
Include：According to the diameter and length of elongated rails described in the image detection of the sample of the acquisition.Preferably, detect described thin
The diameter and length of long stent include：The image cathetus or class straight border of the sample of the acquisition are determined, demarcation is respectively
The position on individual border, the distance between each border is calculated according to the position on each border, so as to obtain the elongated rails
Diameter and length.Preferably, straight line or class straight border, the position on each border of demarcation can be determined by image Hough algorithms
Put and calculate the distance between each border.
Contactless phase transition temperature tester provided by the present invention and its method of testing are realized to Nitinol phase transformation
The non-contact measurement of temperature, compared with contact type measurement, due to using optical ranging by image acquiring device and processor
To detect change in displacement, the mechanical friction error of formula measurement can be avoided contact with so that test is more accurate, can be to any specification
Accurately tested with the nick-eltitanium alloy stent of shape type, and applicability is wide.
Enter to advance below with reference to the drawings and specific embodiments to technical scheme and the advantages of thus bringing
One step is described in detail.
Brief description of the drawings
Fig. 1 a and Fig. 1 b are the structural representations according to the phase transition temperature tester of one embodiment of the present invention；
Fig. 2 a are the fragmentary, perspective views of the phase transition temperature tester in Fig. 1 b, and Fig. 2 b are the signals of the pedestal top plate in Fig. 1 b
Figure；
Fig. 3 a to Fig. 3 c are respectively stereogram, fragmentary, perspective view and the top view of position adjusting mechanism.
Fig. 4 a are the structural representations of the electronic box in Fig. 1 a, and Fig. 4 b are the enlarged diagram of part A.
Fig. 5 is the method stream tested according to the phase transition temperature tester of one embodiment of the present invention sample
Cheng Tu.
Fig. 6 is the method flow diagram tested by Harris Corner Detection Algorithms sample.
Fig. 7 is the method flow diagram for the diameter and length that elongated rails are detected by Hough algorithms.
Embodiment
Various aspects of the present invention are described in detail below in conjunction with the drawings and specific embodiments.Wherein, it is attached
Part in figure is not necessarily drawn to scale, and its design for focusing on to the present invention is illustrated.
In each embodiment of the present invention, the well-known structure or material being directed to are not made in detail
Explanation.Also, feature, structure or characteristic described in the invention can in one or more embodiments group in any way
Close.In addition, it will be appreciated by those skilled in the art that following various embodiments are served only for for example, not for restriction
Protection scope of the present invention.It will be understood by those skilled in the art that in each embodiment described herein and shown in the drawings
Part can be arranged and be designed in a variety of different configurations or ratio.
Before the embodiment of the present invention is described in detail, term involved in the present invention is carried out as described below：
AS：Austenite phase transformation start temperature, refer to austenite to martensite changed when starting critical-temperature.
AF：Austenite phase transformation end temp, refer to austenite to martensite transfor mation complete when critical-temperature.
Austenite：The state that sample (such as nick-eltitanium alloy stent) is in low temperature.
Martensite：The state that sample (such as nick-eltitanium alloy stent) is in high temperature.
【Phase transition temperature tester】
Fig. 1 a and Fig. 1 b are to be according to the structural representation of the phase transition temperature tester of one embodiment of the present invention, Fig. 1 a
Sliding door opens structural representation during opening, and Fig. 1 b are structural representation when sliding door closes opening.As shown in Figure 1a, this implementation
Phase transition temperature tester in mode can include, but are not limited to：Container 1, heater 2, image acquiring device, TEMP
Device 4 and processor.Wherein, container 1 is used to accommodate sample, such as will can be placed on by the sample forced after deforming
Tested in container；Heater 2 is used to heat the sample in container 1 so that sample is because heated
And produce deformation；Image acquiring device is used for the image for obtaining sample, and the temperature sensor 4 being connected with container 1 is used to examine
Survey the temperature change of sample；The processor (being not shown on figure) connects with image acquiring device 3 and the electronics of temperature sensor 4
Connect, so, the image of above-mentioned acquisition and the temperature change detected can be transmitted to the processor, the processor and receiving
Following processing are can perform after the image and temperature change of transmission：The position according to caused by described image detects sample due to heating
Change is moved, and the temperature movement curve of sample is generated according to the change in displacement and temperature change detected.Preferable real
Apply in mode, sample is memorial alloy product, such as can be the nick-eltitanium alloy stent for implantable intravascular, such as by NiTi
The support formed after the support that B alloy wire braiding forms, or Nitinol pipe laser cutting, sample can also be it
His memorial alloy product, or non-memory alloy product.In alternative embodiments, container can be beaker or other can be with
The vessel of solution are contained, heater can heat magnetic stirring apparatus or other to heat the dress of the sample in container
Put, temperature sensor can be thermometer or other devices that can be changed with detection temperature.
In a preferred embodiment, tested primarily directed to tiny nick-eltitanium alloy stent.It is accurate in order to realize
Non-contact measurement, can be engaged by image acquiring device and processor come detection support due to displacement caused by heating
Change.Fig. 3 a to Fig. 3 c are respectively stereogram, fragmentary, perspective view and the top view of image acquiring device, and image obtains dress in Fig. 3 b
The bottom sidewall put is removed to show its internal structure design.As Fig. 3 a to Fig. 3 c with reference to Fig. 1 a and Fig. 1 b understand, image obtains
Device is taken to include：For shooting sample to obtain the camera 31 of the image of sample and for by camera 31
The supporting mechanism that camera site is supported on to be shot to sample.Wherein supporting mechanism can include support base 32 and set
Put the position adjusting mechanism on support base 32.The position adjusting mechanism is suitable to the camera site of adjustment camera, can include：
Guide rail 33, sliding part 34 and drive mechanism 35.Wherein, guide rail 33 is set along the vertical direction in support base 32；Camera 31 is solid
Due to the sliding part 34, sliding part 34 engages with guide rail 33 so that camera 31 can move along guide rail 33；Drive mechanism 35 with
Sliding part 34 is engaged to drive sliding part 34 to be moved along guide rail 33.In the present embodiment, drive mechanism 35 is preferably straight-line electric
Machine, more accurately to adjust the position of camera, the measurement accuracy of camera is improved as far as possible.It is it should be pointed out that of the invention
Embodiment not limited to this, image acquiring device can also be other devices that can obtain sample image；Can also
The position of camera need not be adjusted, camera is fixed on a certain position all the time, i.e. position adjusting mechanism can not be included；
Position adjusting mechanism can also be other structure designs, can be the feasible any mechanism for adjustment position in this area；
The position adjustment of camera can also be driven without using drive mechanism, but position is manually adjusted by user/user, or
The position adjustment of camera is driven using other motors.
As shown in Figure 3 a and Figure 3 b shows, in a preferred embodiment, position adjusting mechanism can also include and the phase of motor 35
The shaft coupling 36 of connection, the leading screw 37 being connected with shaft coupling 36, leading screw 37 are connected to sliding part 34.Driven and joined by motor 35
Axle device 36 is rotated, and convert rotational motion is linear motion by leading screw 37, so as to drive sliding part 34 to be moved along a straight line on guide rail
(in the operating process of the tester of present embodiment, sliding part 34 can be moved up and down along gravity vertical direction or
The rectilinear movement in other directions).Motor 35 is fixed on support base 32 by fixed seat 322, the bearing being connected with leading screw 37
371 (such as rolling bearings) are also secured in fixed seat 322, and so, the rotation of bearing is limited by fixed seat 322 so that silk
The motion of thick stick is also defined, it is not easy to bias displacement, because fixed seat 322 secures motor 35 simultaneously, can reduce motor 35
With the concentricity between bearing 371.
In a preferred embodiment, motor 35 is located at the bottom of phase transition temperature tester (such as along gravity vertical direction
Bottom), to reduce the size of motor and fixed seat, so as to reduce the height of whole tester, motor 35 can also be located at it
His position, can drive camera adjustment position.In this embodiment, motor 35 is arranged on one end of support base, branch
The other end relative with motor on support seat can be provided with flexible barrier 39, to prevent sliding part from sliding derailing.
In alternative embodiments, sensing chip 381 is also provided with sliding part 34, is additionally provided with support base 32
Proximity switch 382, both are engaged to determine the position of sliding part.
As shown in Figure 3 c, in a preferred embodiment, straight pin 321 is additionally provided with support base.The straight pin 321 can
To be play the guiding role when installing guide rail, straight line is formed by two straight pins 321 being arranged on support base, guide rail supports
Installed by the two straight pins 321, guide rail is installed fast accurate can be achieved.
In alternative embodiments, phase transition temperature tester can also include cover body 5, container 1, heater 2, image
Acquisition device 3 and temperature sensor 4 can be contained in the inside of cover body 5, and cover body 5 has opening 51 and sliding door 52, the opening 51
Container 1, heater 2, camera 31 and temperature sensor 4 can be made visible (i.e. user/user can see that), sliding door 52
For opening or closing the opening 51., it is necessary to ensure temperature sensor and image acquiring device not as far as possible in test process
By external interference, therefore cover body can be set with closed vessel 1, heater 2, camera 31 and temperature sensor 4 etc., simultaneously
Set on cover body so, can be opened opening and be placed sample before test by the opening of sliding door either on or off,
Opening can be closed in test process so that container, heater, temperature sensor and image acquiring device etc. are sealed in cover
The inside of body, to reduce test process by external interference.It should be pointed out that embodiments of the present invention can also be not provided with
Cover body, container 1, heater 2, camera 31 and temperature sensor 4 etc. is set to be directly exposed to the external world.
In a preferred embodiment, sliding door 52 may move for 180 degree, be set for example, user can be caught in sliding door
Handle 53 move sliding door, so can larger open opening, the operation of convenient use person.
In a preferred embodiment, by setting rotating mechanism between sliding door 52 and cover body 2, the rotating mechanism is rotated
To move sliding door.Fig. 2 a are the side view fragmentary, perspective view of the tester in Fig. 1 b, and the wherein top of tester is removed with displaying
Its internal structure design.As shown in Figure 2 a, cover body 5 includes the top plate 53 for being arranged on covering on top, and sliding door 52 has and cover body 5
The parallel rotating part 521 of top plate 53.Rotary support mechanism 54 is provided between top plate 53 and rotating part 521, it both may be used
Support sliding door to keep certain distance with covering on top, can be rotated to drive sliding door 52 to be rotated again, so as to which 180 degree movement moves
Door and open opening.
In the embodiment being more highly preferred to, position-limit mechanism is additionally provided between top plate 53 and rotating part 521.Pass through limit
Position mechanism it is upper and lower spacing, can reduce sliding door rotation caused by up and down play.The position-limit mechanism includes being arranged at pedestal top plate
53 limit shaft 55 and the limit shaft sleeve 56 (for example, copper limit shaft and limit shaft sleeve) for being arranged at sliding door rotating part 521,
Sliding door stopper slot 57 is additionally provided with top plate 53 so that limit shaft 55 moves in stopper slot 57.When rotating sliding door, limit shaft
55 can be moved in sliding door stopper slot 57, and the move angle of sliding door is controlled by stopper slot 57.
In the embodiment being more highly preferred to, elastic mechanism is additionally provided between top plate 53 and rotating part 521 to cause
Sliding door can be fixed preferably when opening and closing with pedestal phase buckle.The elastic mechanism includes the spring for being arranged at pedestal top plate 53
Plunger female end seat 581, the spring-loaded plunger male end seat 582 for being arranged at sliding door rotating part 521 and the bullet for being arranged at male end seat 582
Spring plunger 59.When sliding door, which opens and closes, reaches the extreme position on both sides, by making spring-loaded plunger 59 head into female end seat 581
The buckle that sliding door and pedestal can be better achieved is fixed, and the mode that such elastic mechanism buckle is fixed can also compensate for assembling institute
Caused certain error.
In a preferred embodiment, as illustrated in figs. 1A and ib, cover body 5 can be in that cylinder (can also be in square body
Deng), cover body bottom is provided with the electronic box 6 that at least a portion is contained in inside cover body 5.Container 1, heater 2 can be arranged on
On electronic box 6, support base 32 is arranged on the side of electronic box 6.Control panel 61 and touch display screen 62 are provided with electronic box 6, is controlled
Command switch 611 and scram button 612 are provided with panel 61.Can be to processor input instruction by control panel user
Signal, touch display screen can show test result to user.Switch 63 is additionally provided with electronic box 6, for starting or stoping
The test of tester.
Fig. 4 a show the structural representation of electronic box, and Fig. 4 b are the enlarged diagram of part A.As shown in fig. 4 a, in electronic box
Electronic box support member 64 is also provided with, electronic box top at heating means touch with being provided with electronic box substrate 65, electronic box support member
64 can support electronic box substrate 65, realize integrally Gravity support function, when electronic box substrate due to self reason is recessed when can be with
Prevent the substrate deformation.Electronic box substrate 65 is connected to a fixed with electronic box by screw 66.Electronic box support member 64 and electronic box substrate 65
Between have 0.5mm gap.
When using the tester of the present invention, forcing the sample after deforming, (memorial alloy product, such as NiTi close
Golden support) it is placed in the container (for example, beaker) for accommodating low temperature alcoholic solution, during alcohol is heated, due to
The characteristic of memorial alloy product, original position can be slowly returned to, detect this mistake of shape of product change in real time by camera
Journey, product is not in contact with any object outside beaker solution in whole process, then obtains product deformation by algorithm, drafting
With the relation curve of temperature, and the A of product is foundSAnd AFThe temperature of point.
【Method of testing】
Fig. 5 is the method stream tested according to the phase transition temperature tester of one embodiment of the present invention sample
Cheng Tu.As shown in figure 5, this method comprises the following steps：
A. the sample in container is heated；B. the image of sample is obtained, detects the sample
Temperature change；C. the change in displacement according to caused by the image detection sample of acquisition due to heating, and according to detecting
Change in displacement and temperature change generation temperature movement curve, obtain transformation temperature.Preferably, can be by heating water bath to detected sample
Product are heated, and to ensure sample thermally equivalent, for example, can have the test solution of immersion sample in container, are led to
Heating test solution is crossed to heat sample.In alternative embodiments, other heating means pair can also be passed through
Sample is heated.
In the present embodiment, (such as nick-eltitanium alloy stent, can force the branch after deformation first by sample
Frame) it is placed in test solution (such as low temperature alcohol), test solution is entered using heater (such as heating magnetic stirring apparatus)
Row heating uses image acquiring device (camera in image acquiring device, such as high-definition camera so as to heat sample
Head) shooting sample with obtain the image of sample (for example, obtain stent images can be for gray level image, Huo Zheye
It is gray level image that image preprocessing, which can be passed through, by the image procossing of acquisition), while using temperature sensor (such as thermometer)
Real-time measurement temperature.Detect the change in displacement of sample, then real-time rendering according to the image of acquisition using processor afterwards
The temperature movement curve that change in displacement (change in shape of sample) varies with temperature.After drawn temperature movement curve,
The curve that displacement varies with temperature can also be smoothed using mean filter method, and calculate the slope of every bit；Adopt
With human-computer interaction technology, allow user to select to determine the curve of phase transition temperature, its corresponding tangent line drawn when user selects point of contact,
Realize the phase transformation A to sample (such as nick-eltitanium alloy stent)F、ASEquivalent accurate calculating, obtain transformation temperature.
In a preferred embodiment, the change in displacement of sample can be prepared by the following：That is, obtain and true
Determine multiple characteristic points in image, track multiple characteristic points because position caused by heating changes, it is more after the change of calculation position
Length between individual characteristic point, so as to obtain the change in displacement of the sample (change in shape of support).
For example, the change of the characteristic point and characteristic value that need to observe can be detected by Harris Corner Detection Algorithms
(obtain and determine that characteristic point, the position of tracking characteristics point change and calculate the length between characteristic point).Fig. 5, which is shown, passes through Harris
The method flow diagram that Corner Detection Algorithm is tested sample.As shown in figure 5, the figure that support obtains support is shot first
As S501；It is gray level image S502 by the image preprocessing of acquisition；Angle point S503 is obtained by Harris Corner Detection Algorithms；
If this image is the first two field picture, by man-machine interaction by user choose two (or multiple) rack characteristic point for detecting with
Later observation S504 is treated, if this image is not the first two field picture, the Harris angle points around automatic detection original feature point coordinates
As new characteristic point S504 '；Then recording feature point coordinates S505；Calculate the distance between characteristic point S506；In real time simultaneously
Obtain the environment temperature S507 of support；Draw temperature movement curve S508；This flow is repeated until obtaining curve.Also may be used
To use other feature point detections and track algorithm, program operation speed is improved, reduces the sampling interval.
Become it should be noted that embodiments of the present invention are not limited by the method to detect the displacement of sample
Change, other detection methods or other angle point algorithms can also be used.
In a preferred embodiment, before camera is shot, position and the calculating of camera can be adjusted
Focal length.For example, the mode that can manually adjust adjusts camera, understand support and appear in camera coverage,
Complete manual focus；Or camera position is adjusted by computer fine setting, make the gray matrix of captured image
Variance is maximum, completes auto-focusing；Or first carry out manual focus and carry out auto-focusing again.Completing can be with focusing after focusing
Calculated and demarcated, to obtain the ratio of the image length and physical length under, be easy to the later stage to be calculated by image
The actual parameter of support.
The calculating demarcation of focal length can be carried out by following steps：
Formulate containing two a diameter of 2mm, the transparent material demarcation piece (thickness that circle center distance is D0=10mm black round dots
Less than 1mm), demarcation piece is placed in the container for placing support, the image captured by camera entered after auto-focusing is completed
Row binary conversion treatment and the center for calculating each round dot, calculate the distance D1 at two centers；Camera position is raised into h=10mm,
Binary conversion treatment is carried out to the image captured by camera and calculates the center of each round dot, calculates the distance D2 at two centers；Press
The focal length after camera auto-focusing is calculated according to following formula：
In alternative embodiments, tester can also detect sample according to the image of the sample of acquisition
Diameter and length, now sample is the elongated rails made of Nitinol.The detection method can include：It is determined that obtain
Straight line or class straight border in the image of the sample taken, the position on each border is demarcated, according to the position on each border
The distance between each border is calculated, so as to obtain the diameter of elongated rails and length.
For example, the straight line or class straight border in image can be determined by image Hough transform, demarcation of boundary institute is in place
Put and calculate the distance between border the distance between (such as two border) and obtain the diameter and length of support.Fig. 6 is to pass through
The diameter of Hough algorithms detection elongated rails and the method flow diagram of length.As shown in fig. 6, shooting support first obtains support
Image S601；It is gray level image S602 by the image preprocessing of acquisition；Sobel operator edge detections are tentatively to extract rack wheel
Wide S603；Using mathematical morphology filter with eliminate in support cavity and support outside interference S604；Second of Sobel operator
Rim detection is to extract more complete support profile S605；The straight line or class straight line in image are determined by Hough algorithms
Boundary S606；The borderline straight line S607 of connecting bracket two；Interference straight line S608 is filtered out by detection of straight lines slope；Calculate both sides
The distance between boundary (i.e. the length of the diameter of support or support) S609；Obtain the environment temperature of support in real time simultaneously
S6010；Draw temperature-diameter/length curve S6011；This flow is repeated until obtaining curve.
It should be noted that embodiments of the present invention are not limited by the method to detect the diameter of sample and length
Degree, can also use other detection methods or other algorithms.
The term and wording used in description of the invention is just to for example, be not intended to form restriction.Ability
Field technique personnel should be appreciated that on the premise of the general principle of disclosed embodiment is not departed from, to above-mentioned embodiment
In each details can carry out various change.Therefore, protection scope of the present invention is only determined by claim, in the claims,
Unless otherwise indicated, all terms should be understood by the broadest rational meaning.
Claims (19)
1. phase transition temperature tester, it is characterised in that including：
For accommodating the container of sample；
Heater, the sample in the container is heated；
Image acquiring device, for obtaining the image of sample；
Temperature sensor, it is connected with the container, for detecting the temperature change of the sample；
Processor, it is connected with described image acquisition device and temperature sensor electronics, for performing following processing：
The change in displacement according to caused by the image detection sample of acquisition due to heating, and according to the change in displacement that detects and
Temperature change generates the temperature movement curve of sample.
2. phase transition temperature tester as claimed in claim 1, it is characterised in that described image acquisition device includes：
Camera, for shooting sample to obtain the image of sample；
Supporting mechanism, for camera to be supported on into camera site to be shot to sample.
3. phase transition temperature tester as claimed in claim 2, it is characterised in that the supporting mechanism includes：
Support base；
Position adjusting mechanism, it is arranged on support base, suitable for adjusting the camera site of the camera.
4. phase transition temperature tester as claimed in claim 3, it is characterised in that the position adjusting mechanism includes：
Guide rail, set along the vertical direction in the support base；
Sliding part, the camera are fixed with the sliding part, and the sliding part is engaged with the guide rail so that the shooting
Head can move along the guide rail.
5. phase transition temperature tester as claimed in claim 4, it is characterised in that the position adjusting mechanism also includes：
Drive mechanism, the drive mechanism are engaged with sliding part to drive the sliding part to be moved along the guide rail.
6. phase transition temperature tester as claimed in claim 5, it is characterised in that the drive mechanism is linear electric motors.
7. phase transition temperature tester as claimed in claim 6, it is characterised in that the linear electric motors are located at the phase transition temperature
The bottom of tester.
8. phase transition temperature tester as claimed in claim 7, it is characterised in that the phase transition temperature tester also includes accommodating
The container, heater, the cover body of image acquiring device and temperature sensor, wherein, the cover body has and makes container, heating
Device, pickup camera and the visible opening of temperature sensor and the sliding door for opening or closing the opening.
9. phase transition temperature tester as claimed in claim 8, it is characterised in that the sliding door is arranged to 180 degree and may move.
10. phase transition temperature tester as claimed in claim 9, it is characterised in that rotation is provided between the sliding door and cover body
Rotation mechanism, by rotating the rotating mechanism with the movement sliding door.
11. the phase transition temperature tester as any one of claim 1 to 10, it is characterised in that the sample is
Nick-eltitanium alloy stent.
12. the method tested using phase transition temperature tester sample, it is characterised in that comprise the following steps：
A. the sample in container is heated；
B. the image of sample is obtained, detects the temperature change of the sample；
C. the change in displacement according to caused by the image detection sample of acquisition due to heating, and become according to the displacement detected
Change and temperature change generates temperature movement curve, obtain transformation temperature.
13. method as claimed in claim 12, wherein, there is the test solution for soaking sample in the container, also,
Step a includes：Sample is heated by heating the test solution.
14. method as claimed in claim 13, wherein, detection sample is included due to change in displacement caused by heating：Obtain
Take and determine multiple characteristic points in the image of the sample of the acquisition, track the multiple characteristic point because heating causes
Position change, calculation position change after the multiple characteristic point between length, so as to obtain the position of the sample
Move change.
15. method as claimed in claim 14, wherein, obtained by Harris Corner Detection Algorithms and determine the multiple spy
Levy the length between the multiple characteristic point after point, the position change of the multiple characteristic point of tracking and calculation position change.
16. method as claimed in claim 15, wherein, described image is gray level image.
17. method as claimed in claim 12, wherein, the sample is elongated rails, institute made of Nitinol
Stating method also includes：
According to the diameter and length of elongated rails described in the image detection of the sample of the acquisition.
18. method as claimed in claim 17, wherein, the diameter and length for detecting the elongated rails include：It is it is determined that described
The image cathetus or class straight border of the sample of acquisition, the position on each border is demarcated, according to the position on each border
The distance between each border is calculated, so as to obtain the diameter of the elongated rails and length.
19. method as claimed in claim 18, wherein, straight line or class straight border, demarcation are determined by image Hough algorithms
The position on each border simultaneously calculates the distance between each border.
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