CN109100022A - Temp measuring method and system - Google Patents
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- CN109100022A CN109100022A CN201810811768.5A CN201810811768A CN109100022A CN 109100022 A CN109100022 A CN 109100022A CN 201810811768 A CN201810811768 A CN 201810811768A CN 109100022 A CN109100022 A CN 109100022A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 23
- 238000004737 colorimetric analysis Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 9
- 230000001174 ascending effect Effects 0.000 claims description 5
- 238000004861 thermometry Methods 0.000 description 7
- 230000005855 radiation Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
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- 238000009529 body temperature measurement Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
This disclosure relates to a kind of temp measuring method and system characterized by comprising obtain image of the surface of testee under multiple light intensity decays rates, each image corresponds to corresponding light intensity decays rate；During obtaining each image, the single point temperature in the region for meeting image definition requirements of the testee is measured, as fiducial temperature corresponding with the image；It is carried out the following processing for described image: determining the target area in the image according to the grayscale value of each image and grayscale threshold value；According to the corresponding fiducial temperature of each image, the temperature field of the target area of the image is determined using colorimetric method；According to the temperature field of the target area of each image, the temperature field on the surface of the testee is determined.The temp measuring method and system, low cost, the acquisition for efficiently realizing body surface temperature field under high brightness gradient condition.
Description
Technical field
This disclosure relates to metering field more particularly to a kind of temp measuring method and system.
Background technique
For aircraft during military service, surface is by Aerodynamic Heating, in the surfaces such as aircraft nose cone, edge of a wing heat build-up,
It can achieve excessive temperature.Before formal be on active service, generally require to carry out the examination of ground high temperature to above-mentioned hot-end component.At present for
Aircraft hot end structure and the major way of component ground high temperature examination are high-temperature tunnels.During examination, parts surface temperature
Spending field is an important parameter.On the one hand, lot of materials attribute is that temperature is relevant, such as elasticity modulus of materials and intensity；It is another
Aspect, when research material deforms, the strain that actual measurement obtains is the sum of the strain that strain caused by stress is generated with thermal expansion,
In mechanics study, often strained more concerned about caused by stress, it is therefore desirable to decouple the two.
Currently, thermometry has very much, thermometry, pressure thermometry, electricity thermometry, acoustic thermometry are such as expanded
Method, otpical thermometry etc..It under high temperature environment, is the optics temp measuring method of representative with its whole audience, non-contact using two-color thermometry
The characteristics of, obtain relatively broad research.This method is that the radiation luminous intensity based on different wave length carries out temperature computation.One
Kind method is to radiate intensity information using the CCD camera acquisition with red R, green G, blue B triple channel, and utilize two of them logical
The light intensity in road carries out colorimetric and obtains temperature field.
In high-temperature tunnel, the test specimen head temperature of face wind-tunnel high-temperature high-speed airflow outlet is higher, can reach 1500 DEG C
More than；And the test specimen terminal temperature in tunnel airstream exit is lower, generally at 200-300 DEG C；Therefore, in test specimen different zones
Temperature has very big difference.According to Planck blackbody radiation law, brightness also larger difference is radiated at this time.In addition, in superelevation
Under warm environment (such as 3000 DEG C or more), radiant light reaches very high intensity, and lesser temperature change in spatial dimension, also can at this time
Lead to the steep increasing or steep drop of brightness.The adjusting of brightness causes very big challenge when therefore to Image Acquisition.Higher brightness in order to obtain
The clearly image at place, generally requires lesser aperture and extremely short time for exposure；And in order to obtain compared with clear at low-light level
Image, need biggish aperture and longer time for exposure.Therefore, the Image Acquisition of different zones and temperature measure often not
It can take into account.Therefore, it is necessary to develop a kind of inexpensive, efficient thermometric scheme, body surface temperature under high brightness gradient condition is realized
Spend the acquisition of field.
Summary of the invention
In view of this, the present disclosure proposes a kind of temp measuring method and system, low cost efficiently realizes high brightness gradient
Under the conditions of body surface temperature field acquisition.
On the one hand the disclosure, proposes a kind of temp measuring method, comprising: decline in multiple luminous intensities on the surface for obtaining testee
Image under lapse rate, each image correspond to corresponding light intensity decays rate；During obtaining each image, measure described tested
The single point temperature in the region for meeting image definition requirements on the surface of object, as fiducial temperature corresponding with the image；Needle
Described image is carried out the following processing: determining the target area in the image according to the grayscale value of each image and grayscale threshold value；
According to the corresponding fiducial temperature of each image, the temperature field of the target area of the image is determined using colorimetric method；According to each image
Target area temperature field, determine the temperature field on the surface of the testee.
On the other hand the disclosure proposes a kind of temp measuring system, the system comprises: image acquiring device, it is tested for obtaining
The image on the surface of object；Attenuation rate regulating device, for adjusting light intensity decays rate when image acquiring device obtains image；
Temperature measuring device, the single point temperature in the region for meeting image definition requirements on the surface for measuring testee；Processing
Device, for being carried out the following processing for described image: being determined in the image according to the grayscale value of each image and grayscale threshold value
Target area；According to the corresponding fiducial temperature of each image, the temperature field of the target area of the image is determined using colorimetric method；
According to the temperature field of the target area of each image, the temperature field on the surface of the testee is determined, wherein described image is logical
Cross the figure of image acquiring device and the acquisition of attenuation rate regulating device, testee surface under multiple light intensity decays rates
Picture, each image correspond to corresponding light intensity decays rate；The corresponding fiducial temperature of image is that temperature measuring device is obtained in image
The single-point temperature in the region for meeting image definition requirements on surface measured during taking device to obtain the image, testee
Degree.
The temp measuring method and system of the embodiment of the present disclosure obtain the surface of testee under multiple light intensity decays rates
Image, and determine according to colorimetric method the temperature field of the target area of each image, and be tested by the temperature field of target area
The temperature field on the surface of object, so that still being able to pass through difference in the higher situation of surface brightness gradient of testee
Attenuation rate get a distinct image for each section on surface, and synthesized using the temperature field of the target area under differential declines rate
The temperature field on testee surface is finally obtained, under high brightness gradient, high-precision temperature field is realized with lower cost
Measurement.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, the other feature and aspect of the disclosure will become
It is clear.
Detailed description of the invention
Comprising in the description and constituting the attached drawing of part of specification and specification together illustrates the disclosure
Exemplary embodiment, feature and aspect, and for explaining the principles of this disclosure.
Fig. 1 shows the structure chart of the temp measuring system according to the embodiment of the present disclosure.
Fig. 2 shows the schematic diagrames that temperature field measurement is carried out according to the temperature measuring equipment of the embodiment of the present disclosure.
Fig. 3 shows the flow chart of the temp measuring method according to the embodiment of the present disclosure.
Specific embodiment
Various exemplary embodiments, feature and the aspect of the disclosure are described in detail below with reference to attached drawing.It is identical in attached drawing
Appended drawing reference indicate element functionally identical or similar.Although the various aspects of embodiment are shown in the attached drawings, remove
It non-specifically points out, it is not necessary to attached drawing drawn to scale.
Dedicated word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
In addition, giving numerous details in specific embodiment below to better illustrate the disclosure.
It will be appreciated by those skilled in the art that without certain details, the disclosure equally be can be implemented.In some instances, for
Method, means, element and circuit well known to those skilled in the art are not described in detail, in order to highlight the purport of the disclosure.
Fig. 1 shows the structure chart of the temp measuring system according to the embodiment of the present disclosure.As shown in Figure 1, the system 100 includes:
Image acquiring device 101, the image on the surface for obtaining testee.Image acquiring device 101 can be tool
There is any device of image-acquisition functions, such as with red R, green G, the colorful CCD camera of blue B triple channel.In use, image
The surface that the camera lens of acquisition device 101 can be directed at testee 105 is shot.
Attenuation rate regulating device 102, for adjusting light intensity decays rate when image acquiring device 101 obtains image.It declines
Lapse rate regulating device 102 can be the adjustable attenuator of attenuation rate, or the attenuator group of the attenuator including differential declines rate.
Attenuation rate regulating device 102 is such as, but not limited to: attenuator group, the adjustable dual-polarization of opposite polarization angle with rotary wheel device
Piece combination, attenuator of electroluminescent attenuation rate variation etc..
Attenuation rate regulating device 102 can carry out the adjusting of attenuation rate by automatic or manual.
Attenuation rate regulating device 102 can be built in image acquiring device 101, may also set up in image acquiring device
Outside 101.In use, attenuation rate regulating device 102 may be provided at the camera lens of image acquiring device 101 and the table of testee
Between face, for decaying to the luminous intensity for entering camera lens, and attenuation rate can be adjusted.
Temperature measuring device 103, the region for meeting image definition requirements on the surface for measuring testee 105
Single point temperature is as fiducial temperature.Temperature measuring device is, for example, single-point temperature measurer.
In one possible implementation, the surface of testee can also be measured by temperature measuring device 103
The temperature for meeting any point in the region of image definition requirements, as fiducial temperature corresponding with the image.Wherein, image
Clarity requires rule of thumb to be manually set, the disclosure to this with no restriction, for example, can whether moderate according to brightness, i.e.,
Whether brightness is within preset range, to judge whether clarity meets the requirements.Judge whether image meets image definition and want
Asking can be realized by the relevant technologies, the disclosure to this with no restriction.For example, if some portion of blue channel figure in the surface of testee
The pixel gray level value of picture then judges that the part is the region for meeting image definition requirements between 100~200, and selects at random
Selecting and measuring the temperature of the certain point in the part is the single point temperature for meeting the region of image definition requirements.
Processing unit 104, for being carried out the following processing for described image: according to the grayscale value of each image and grayscale threshold
It is worth the target area determined in the image；According to the corresponding fiducial temperature of each image, the mesh of the image is determined using colorimetric method
Mark the temperature field in region；According to the temperature field of the target area of each image, the temperature field on the surface of the testee is determined,
In, described image be obtained by image acquiring device and attenuation rate regulating device, the surface of testee is in multiple light intensity
The image under attenuation rate is spent, each image corresponds to corresponding light intensity decays rate；The corresponding fiducial temperature of image is that temperature is surveyed
The image definition requirements that meet that amount device measures during image acquiring device obtains the image, the surface of testee
The single point temperature in region.
Image acquiring device 101, attenuation rate regulating device 102, temperature measuring device 103 can be connected to processing unit 104,
Processing unit 104 can control image acquiring device 101, attenuation rate regulating device 102, temperature measuring device 103 etc.,
Image acquiring device 101 can be obtained, the data of temperature measuring device 103 are handled.
The temp measuring system of the embodiment of the present disclosure obtains testee by image acquiring device and attenuation rate regulating device
Image of the surface under multiple light intensity decays rates, and determine according to colorimetric method the temperature field of the target area of each image, and lead to
Cross target area temperature field obtain testee surface temperature field so that the surface brightness gradient in testee is higher
In the case where, it still is able to each section by different attenuation rates for surface and gets a distinct image, and utilize differential declines
The temperature field synthesis of target area under rate finally obtains the temperature field on testee surface, is realized with lower cost highlighted
Spend under gradient, high-precision temperature field measurement.
In one possible implementation, the frequency acquisition of temperature measuring device 103 (such as single-point temperature measurer) is equal to
The attenuation rate of attenuation rate regulating device 102 adjusts frequency；Image acquiring device 101 (such as colorful CCD camera) acquisition frame rate etc.
Frequency is adjusted in the attenuation rate of attenuation rate regulating device 102, to realize the synchronization of data.
In one possible implementation, in the image for corresponding to minimum light intensity attenuation rate, the table of testee
The most dark-part in face meets image definition requirements；In the image for corresponding to maximum light intensity attenuation rate, the table of testee
The most bright part in face meets image definition requirements, so that the part most dark and most bright for the surface of testee
Obtain clearly image.
Wherein, clarity require can rule of thumb be manually set, the disclosure to this with no restriction, for example, can be according to bright
Whether degree is moderate, i.e. whether brightness is within preset range, to judge whether clarity meets the requirements.Judge whether image meets
Clarity require can be realized by the relevant technologies, the disclosure to this with no restriction.For example, can be in some portion of red channel picture of image
When plain grayscale value is between 100~180, judges that the part luma is moderate, meet image definition requirements.
Fig. 2 shows the schematic diagrames that temperature field measurement is carried out according to the temperature measuring equipment of the embodiment of the present disclosure.
As shown in Fig. 2, in one example, the temperature gradient of the surface different piece of testee is larger, if directly
Shoot the image on the surface of testee, it is difficult to guarantee that part darker in image and brighter part all clearly (may go out
Now cross dark or overexposure phenomenon), so that colorimetric method, which is difficult to be utilized, obtains accurate temperature field.
Using the temp measuring system of the embodiment of the present disclosure, can perform the following operation:
1) first by colorful CCD camera alignment lens testee, the adjustable attenuator of attenuation rate is adjusted to minimum decline
Lapse rate A0, or minimum attenuation rate A in selection attenuator group0Attenuator, and when the focal length of adjustable camera, aperture and exposure
Between, with minimum attenuation rate A0, shoot the image P on the surface of testee0.In image P0In, the surface of testee it is most dark
Part L meets clarity requirement, and brightness is moderate.For example, the red channel pixel gray level value of the parts of images is between 100~180.
Single-point temperature measurer can synchronous recording testee surface the region for meeting image definition requirements single-point temperature
Degree is used as image P0Fiducial temperature T0。
2) next, the attenuation rate or the replacement higher attenuator of attenuation rate of attenuator can be improved, attenuation rate is made to become A1,
So that at this time the surface of testee it is brighter than most dark-part L compared with dark-part institute it is moderate at brightness of image, obtain measured object
The image P on the surface of body1, and utilize the image definition requirements that meet on the surface of single-point temperature measurer synchronous recording testee
The single point temperature in region is as image P1Fiducial temperature T1；
3) it is gradually increased the attenuation rate of attenuator or attenuator group, the operation of the 2) step is repeated, until traversing all settings
Attenuation rate, be finally reached highest attenuation rate An.Under the highest attenuation rate, the highest part H of the surface brightness of testee
Institute is moderate at brightness of image, shoots the image P on the surface of testeen, and utilize single-point temperature measurer synchronous recording testee
The single point temperature in the region for meeting image definition requirements on surface is as respective image PnFiducial temperature Tn。
It should be noted that each attenuation rate can according to need to set, for example, scale division value that attenuation rate is adjusted or
Every can determine that brightness step is bigger, and attenuation rate control interval is smaller according to the size of the surface brightness gradient of testee, one group
The picture number for including in image sequence is more.
By step 1), step 2), step 3), that is, a collection period is completed, one group of image and corresponding benchmark are obtained
Temperature.Processor can be handled to obtain the temperature field on the surface of the corresponding testee of the collection period.
Step 1), step 2), step 3) can be performed a plurality of times and obtain multiple series of images and corresponding fiducial temperature, obtain multiple
During temperature field measurement is as a result, each measurement result reflects each collection period respectively, the temperature field on the surface of testee.
In one possible implementation, processing unit 104 is determined according to the grayscale value and grayscale threshold value of each image
Target area in the image, it may include: according to the sequence that light intensity decays rate is ascending, successively determine that each luminous intensity declines
Target area in the corresponding image of lapse rate wherein the grayscale value of the target area of each image is less than grayscale threshold value, and belongs to
Region except the target area of image before the image.Wherein, the image before the image refers to attenuation rate than the image
The small all images of attenuation rate.It is not overlapped and is mutually linked between the target area of each image obtained as a result, and is each
The target area brightness of image is moderate.
Processing unit can determine the target area of the image using colorimetric method according to the corresponding fiducial temperature of each image
Temperature field；The corresponding temperature field in the target area of each image can be synthesized according to the coordinate of target area, obtain the quilt
Survey the temperature field on the surface of object.
Wherein, grayscale value can be the ash of one or more of red channel pixel, green channel pixel or blue channel pixel
Rank value.Grayscale threshold value, which can according to need, to be set, the disclosure to this with no restriction.
By taking the hot-end components such as nose cone, the edge of a wing that the surface of testee is aircraft as an example, in general, at present for heat
The temperature of end pieces ground examination is mostly at 3000 DEG C or less.In this temperature range, red light radiation intensity is most strong, and green light takes second place,
Blue light is most weak.Therefore when carrying out color comparison temperature measurement, if temperature at 2000 DEG C hereinafter, if using red light and green light progress colorimetric, with
Improve signal-to-noise ratio；But it is more than 2000 DEG C, in the stronger situation of overall radiation in temperature, green, blue light can also be used and carry out colorimetric, with
Expand temperature-measuring range.For this sentences feux rouges, green light colorimetric, principle is illustrated.
In conjunction with Fig. 2, in one example, for each group of image sequence obtained in a collection period, analyze first
Initial pictures P0, i.e., with minimum attenuation rate A0Corresponding image P0.As previously mentioned, red light radiation intensity is most strong, therefore it can give and be directed to
Grayscale the threshold value Th, Th of feux rouges can determines according to actual conditions, for 8 bit images, and value range can be 230-255.It can will scheme
As P0In, the set of the pixel of red channel pixel gray level value >=Th is defined as highlight area H0, other regions are defined as non-bloom
Region L0, and store highlight area H0With non-highlight area L0Coordinate point data.Wherein, non-highlight area L0As image P0's
Target area.
Based on image P0Corresponding fiducial temperature T0, it utilizes colorimetric method (i.e. formula 1):
It can be calculated non-highlight area L0The corresponding temperature T of interior pixel ii(i is positive integer).In formula 1, BRGiIndicate picture
The ratio of red light intensity and green intensity, B at vegetarian refreshments iRG0Indicate fiducial temperature T0Red light intensity and green light at corresponding pixel
The ratio of intensity, λGIndicate the wavelength of green light, λRIndicate the wavelength of feux rouges, C2Indicate radiation constant.
If the non-highlight area L0Comprising N number of pixel (N is positive integer), then non-bloom is calculated in 1≤i≤N, traversal
Region L0The corresponding temperature of interior N number of pixel, can be obtained non-highlight area L0Temperature field { T1,T2,T3,L,TN-1,TN}。
Next, the sequence ascending according to attenuation rate, searches for next attenuation rate A1Corresponding image P1In be located at it is above
Identified highlight area H0Interior (image P0Target area except region) and red channel pixel gray level value be less than Th point,
Its coordinate is recorded, and is denoted as non-highlight area L1, it is based on image P1Corresponding fiducial temperature Ta, can be calculated using colorimetric method non-
Highlight area L1(image P1Target area) in temperature field, and can with this temperature field fill highlight area H0Middle respective coordinates
The temperature value at place, and by the coordinate of the point of filling from highlight area H0Image P is realized in middle rejecting0Target area temperature field and
Image P1Target area temperature field synthesis, form non-highlight area L1' it (include L1And L0)；It is remaining not to be removed
Highlight area H0In point form highlight area H1(image P0、P1Target area except region)；
Next, searching for next attenuation rate A2Corresponding image P2In be located at highlight area H1Interior and red channel pixel ash
Rank value is less than the point of Th, records its coordinate, and be denoted as non-highlight area L2(image P2In target area), be based on image P2It is right
The fiducial temperature T answeredb, can be calculated non-highlight area L using colorimetric method2Interior temperature field, and specular is filled with this temperature field
Domain H1Temperature value at middle respective coordinates, and by the coordinate of the point of filling from highlight area H1Middle rejecting forms non-highlight area
L2' it (include L0, L1, L2)；The remaining highlight area H not being removed1In point form highlight area H2(image P0、P1、P2's
Region except target area).
And so on, until the last piece image P in this group of image sequencen, non-highlight area L is corresponded at this timen', and area
Domain Ln' and image PnIt is equal in magnitude.Thus this group of image sequence generates the thermo parameters method figure on an amplitude object surface, as should
The temperature field on the surface of the testee in the collection period of image sequence.
The next image sequence obtained in next sampling period can be repeated the above process, next sampling week can be obtained
The temperature field of phase.
The above is only examples, rather than limit the concrete mode for obtaining the temperature field on surface of testee.Art technology
Personnel should be understood that the temperature field that the surface of testee also can be obtained by other reasonable means, such as can record respectively every
The corresponding temperature value of coordinate and coordinate of the target area of a image, and spliced according to coordinate, obtain the table of testee
The temperature field in face.
In one possible implementation.Temperature measuring device 103 measures described tested during obtaining each image
The single point temperature of the same position in the region for meeting image definition requirements on the surface of object, as base corresponding with the image
Quasi- temperature；The processing unit 104 is also used to: when the difference between the corresponding fiducial temperature of each image meets condition, for
Described image carries out the processing
Still by taking example above as an example, the step 1), step 2), in step 3), in the same image acquisition period
It is interior, it is desirable to which that testee surface brightness is without significant change；Whether testee surface brightness has more apparent variation that can pass through single-point
Temperature measurer temperature value of the measured obtained same position in testee surface in an image sequence changes to assess, example
As: if the temperature of same point measured by single-point temperature measurer is identical or is not much different (such as within the scope of 10 DEG C), it can be considered satisfaction
Condition, then it is assumed that image captured in same image sequence is the image under the same state of testee surface, processing at this time
Device can be handled for the image sequence, obtain the temperature field of testee surface in this state.Conversely, if difference compared with
Greatly, it can be considered that the condition of being unsatisfactory for, processing unit can be without processing.It can be by controlling experiment condition, to ensure measured object body surface
Face brightness is without significant change.Wherein, the condition that the difference between fiducial temperature need to meet can determines according to actual conditions, the disclosure
With no restriction to this.
Fig. 3 shows the flow chart of the temp measuring method according to the embodiment of the present disclosure.As shown in figure 3, this method comprises:
Step 301, image of the surface of testee under multiple light intensity decays rates is obtained, each image corresponds to phase
The light intensity decays rate answered；
Step 302, during obtaining each image, the image definition requirements that meet on the testee surface are measured
The single point temperature in region, as fiducial temperature corresponding with the image；
Step 303, it is carried out the following processing for described image:
Step 3031, the target area in the image is determined according to the grayscale value of each image and grayscale threshold value；
Step 3032, according to the corresponding fiducial temperature of each image, the target area of the image is determined using colorimetric method
Temperature field；
Step 3033, according to the temperature field of the target area of each image, the temperature field on the surface of the testee is determined.
The temp measuring method of the embodiment of the present disclosure is by obtaining figure of the surface of testee under multiple light intensity decays rates
Picture, and determine according to colorimetric method the temperature field of the target area of each image, and measured object is obtained by the temperature field of target area
The temperature field on the surface of body, so that still being able in the higher situation of surface brightness gradient of testee by different
Attenuation rate gets a distinct image for each section on surface, and most using the synthesis of the temperature field of the target area under differential declines rate
The temperature field on testee surface is obtained eventually, and under high brightness gradient, high-precision temperature field is realized with lower cost and is surveyed
Amount.
In one possible implementation, the mesh in the image is determined according to the grayscale value of each image and grayscale threshold value
Mark region, it may include: according to the sequence that light intensity decays rate is ascending, successively determine the corresponding figure of each light intensity decays rate
Target area as in wherein the grayscale value of the target area of each image is less than grayscale threshold value, and belongs to before the image
Region except the target area of image.
In one possible implementation, according to the temperature field of the target area of each image, the testee is determined
Surface temperature field, it may include: the temperature field of the target area of each image is synthesized according to the coordinate of target area, is obtained
To the temperature field on the surface of the testee.
In one possible implementation, during obtaining each image, expiring for the surface of the testee is measured
The single point temperature in the region of sufficient image definition requirements, as fiducial temperature corresponding with the image, it may include: it is each obtaining
During image, the single-point temperature of the same position in the region for meeting image definition requirements on the surface of the testee is measured
Degree, as fiducial temperature corresponding with the image；The method may also include that the difference between the corresponding fiducial temperature of each image
It is different when meeting condition, the processing is carried out for described image.
In one possible implementation, in the image for corresponding to minimum light intensity attenuation rate, the table of testee
The most dark-part in face meets image definition requirements；In the image for corresponding to maximum light intensity attenuation rate, the table of testee
The most bright part in face meets image definition requirements.
About the example implementations of temp measuring method, reference can be made to the explanation of temp measuring system is not repeated herein.
The embodiment of the present disclosure provides a kind of temp measuring method and system being adapted under highlight surface degree gradient condition, eliminates
Testee surface brightness differs greatly influence to image data acquiring and temperature computation, and realizing has under hot environment
The temperature field measurement of the body surface of greater brightness difference, and maintain higher precision.The disclosure has been filled up under hot environment
Testee surface brightness differ greatly under conditions of temperature field measurement method vacancy, be current aircraft associated components
Ground examination provides strong technical support.
The presently disclosed embodiments is described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.The selection of term used herein, purport
In principle, the practical application or to the technological improvement in market for best explaining each embodiment, or make the art its
Its those of ordinary skill can understand each embodiment disclosed herein.
Claims (11)
1. a kind of temp measuring method characterized by comprising
Image of the surface of testee under multiple light intensity decays rates is obtained, each image corresponds to corresponding luminous intensity and declines
Lapse rate；
During obtaining each image, the single-point in the region for meeting image definition requirements on the surface of the testee is measured
Temperature, as fiducial temperature corresponding with the image；
It is carried out the following processing for described image:
The target area in the image is determined according to the grayscale value of each image and grayscale threshold value；
According to the corresponding fiducial temperature of each image, the temperature field of the target area of the image is determined using colorimetric method；
According to the temperature field of the target area of each image, the temperature field on the surface of the testee is determined.
2. being somebody's turn to do the method according to claim 1, wherein being determined according to the grayscale value of each image and grayscale threshold value
Target area in image, comprising:
According to the sequence that light intensity decays rate is ascending, the target in the corresponding image of each light intensity decays rate is successively determined
Region wherein the grayscale value of the target area of each image is less than grayscale threshold value, and belongs to the target of the image before the image
Region except region.
3. the method according to claim 1, wherein determining institute according to the temperature field of the target area of each image
State the temperature field on the surface of testee, comprising:
The temperature field of the target area of each image is synthesized according to the coordinate of target area, obtains the table of the testee
The temperature field in face.
4. the method according to claim 1, which is characterized in that during obtaining each image, measurement
The single point temperature in the region for meeting image definition requirements on the surface of the testee, as benchmark corresponding with the image
Temperature, including
During obtaining each image, the same of the region for meeting image definition requirements on the surface of the testee is measured
The single point temperature of position, as fiducial temperature corresponding with the image；
The method also includes: when the difference between the corresponding fiducial temperature of each image meets condition, for described image into
The row processing.
5. the method according to claim 1, which is characterized in that
In the image for corresponding to minimum light intensity attenuation rate, the most dark-part on the surface of testee, which meets image definition, to be wanted
It asks；
In the image for corresponding to maximum light intensity attenuation rate, the most bright part on the surface of testee meets image definition and wants
It asks.
6. a kind of temp measuring system, which is characterized in that the system comprises:
Image acquiring device, the image on the surface for obtaining testee；
Attenuation rate regulating device, for adjusting light intensity decays rate when image acquiring device obtains image；
The single point temperature of temperature measuring device, the region for meeting image definition requirements on the surface for measuring testee is made
For benchmark temperature；
Processing unit, for being carried out the following processing for described image: being determined according to the grayscale value of each image and grayscale threshold value
Target area in the image；According to the corresponding fiducial temperature of each image, the target area of the image is determined using colorimetric method
Temperature field；According to the temperature field of the target area of each image, the temperature field on the surface of the testee is determined,
Wherein, described image be obtained by image acquiring device and attenuation rate regulating device, the surface of testee is more
Image under a light intensity decays rate, each image correspond to corresponding light intensity decays rate；
The corresponding fiducial temperature of image be temperature measuring device measured during image acquiring device obtains the image, measured object
The single point temperature in the region for meeting image definition requirements on the surface of body.
7. system according to claim 6, which is characterized in that attenuation rate regulating device includes:
The adjustable attenuator of attenuation rate or attenuator group, the attenuator including differential declines rate.
8. system according to claim 6, which is characterized in that being determined according to the grayscale value of each image and grayscale threshold value should
Target area in image, comprising:
According to the sequence that light intensity decays rate is ascending, the target in the corresponding image of each light intensity decays rate is successively determined
Region wherein the grayscale value of the target area of each image is less than grayscale threshold value, and belongs to the target of the image before the image
Region except region.
9. system according to claim 6, which is characterized in that according to the temperature field of the target area of each image, determine institute
State the temperature field on the surface of testee, comprising:
The temperature field of the target area of each image is synthesized according to the coordinate of target area, obtains the table of the testee
The temperature field in face.
10. system according to any one of claims 6 to 9, which is characterized in that
The temperature measuring device is used for during obtaining each image, measure the surface of the testee to meet image clear
The single point temperature in the region that clear degree requires, as fiducial temperature corresponding with the image；
The processing unit is also used to: when the difference between the corresponding fiducial temperature of each image meets condition, for the figure
As carrying out the processing.
11. system according to any one of claims 6 to 9, which is characterized in that
In the image for corresponding to minimum light intensity attenuation rate, the most dark-part on the surface of testee, which meets image definition, to be wanted
It asks；
In the image for corresponding to maximum light intensity attenuation rate, the most bright part on the surface of testee meets image definition and wants
It asks.
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