CN107421717A - A kind of infrared thermoviewer minimum detectable temperature difference automatic test approach and device - Google Patents
A kind of infrared thermoviewer minimum detectable temperature difference automatic test approach and device Download PDFInfo
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Abstract
The invention discloses the method and device that a kind of infrared thermoviewer minimum detectable temperature difference is tested automatically, methods described is first by the Gain tuning of infrared thermoviewer to maximum, and being adjusted to the larger temperature difference makes circular hole targets SD wash imaging, reducing the temperature difference again makes circular hole target image quality drop to M times of blur-free imaging, record now temperature approach；Continuing, which reduces the temperature difference, makes circular hole target image quality again as M times of blur-free imaging, records now temperature approach；Usage amount temperature approach calculates minimum detectable temperature difference；Described device includes being used for the optical table for carrying all devices, for controlling the temperature control modules of environment temperature, for sending the difference black matrix source module of Target Infrared Radiation, for making difference black-body resource form the target wheel module of designated shape and frequency, for controlling the difference black-body resource temperature controller of difference black matrix source temperature, for controlling the parallel light tube of conversion infra-red radiation shape, for controlling the computer of each module.
Description
Technical field
The present invention relates to infrared thermoviewer performance parameter test technical field, more particularly, to a kind of infrared thermoviewer
Minimum detectable temperature difference automatic test approach and device.
Background technology
Minimum detectable temperature difference (MDTD) is an important parameter for evaluating infrared imaging system, reflects the heat spirit of system
Sensitivity characteristic, also reflects the spatial resolution of system its definition is：When the observing time observed is unrestricted, red
When square or circular target and its location of certain size can be told on outer imaging system display screen just, target with
The temperature difference between background is referred to as the minimum detectable temperature difference of corresponding target size.
International mainstream MDTD measurements at present are still used by professional by eye-observation method (subjective measurement method), should
Although method practicality is stronger, by observer itself relative influence, cause the uncertain larger of measurement result, reliability
Repeatability is not high.With the development of computer technology, the country expands in the nineties in last century to MDTD objective measurement methods grinds
Study carefully, be mainly based upon neural network algorithm and feature extraction is carried out simultaneously to infrared image caused by infrared thermoviewer by computer
Identification, but this method still needs to establish and carries out subsequent treatment on the basis of subjective measurement methods and resultses to image, thus still by
Restricted to the influence manually brought.
The content of the invention
In order to solve the problems, such as that minimum detectable temperature difference measurement is larger by subjective impact existing for background technology, the present invention carries
A kind of infrared thermoviewer minimum detectable temperature difference automatic test approach and device are supplied, methods described and device need not be artificial right
Infrared thermoviewer picture quality is assessed, and ensure that the objective and accurate property of test result.
A kind of infrared thermoviewer minimum detectable temperature difference automatic test approach, methods described include：
Step 1, circular hole target of the spatial frequency for f is selected, the gain of infrared thermoviewer is arranged to maximum；
Step 2, larger temperature approach is set to make circular hole targets mark blur-free imaging using difference black-body resource temperature controller, it is described
The temperature difference of the temperature difference between target background and difference black-body resource；
Step 3, temperature approach is gradually reduced, the image after reducing every time is gathered and calculates circular hole target image quality, treat as
When M times of blur-free imaging is reduced to as quality, record temperature approach is Δ T1, wherein 0≤M≤1；
Step 4, continue to reduce temperature approach, gather the image after reducing every time and calculate circular hole target image quality, treat as
When as quality being M times of blur-free imaging again, record temperature approach is Δ T2, wherein 0≤M≤1；
Step 5, according to Δ T1With Δ T2Calculate minimum detectable temperature difference；
Step 6, the circular hole target of different space frequency is changed, the corresponding different space frequency of the test that repeats the above steps is most
The small detectable temperature difference, and draw the minimum detectable temperature difference curve of tested infrared thermoviewer.
Further, current infrared picture data I is gathered, the maximum entropy threshold of image is calculated and divides the image into as target
Region IoWith background area IbTwo parts, extract target area IoBorder is simultaneously designated as c, calculates girth and area that c encloses region
And be designated as lengt (c) and Area (c) respectively, then image quality QIIt is calculated as follows：
Wherein, target area IoFor circular hole target imaging region, background area IbFor collection image in remove circular hole target into
As the region beyond region；
Further, the circular hole target imaging clearly refers to work as QI>When 0.8, differentiate current infrared picture data I for circle
The clear infrared imaging of hole target, circular hole target imaging region now are designated as
Further, the image quality multiple M=3/4；
Further, when temperature approach often reduces by one time, collection calculates the maximum entropy threshold of image and will schemed as time infrared picture data I '
As being divided into candidate target region I 'ocWith candidate background region I 'bTwo parts, if candidate target region I 'ocInclude N (N>0) individual mutual not connected region, i.e.,：
I′oc={ c '0..., c 'N, then current circular hole target imaging region
Current circular hole target imaging region I 'OPositioned at blur-free imaging regionInterior part is designated asIt is describedI′oPositioned at blur-free imaging regionOuter part is designated asInstitute
State Then current circular hole target image quality is QI′Calculate such as
Under：
Wherein, AIFor total imaging region；
Further, the circular hole target image quality QI′Meet | QI′- M | during ＜ 0.01, then image quality meets clear
M times during quality；
Further, the method for the minimum detectable temperature difference is
A kind of infrared thermoviewer minimum detectable temperature difference automatic testing equipment, described device include:
Optical table, the optical table horizontal stable is without friction, for carrying all devices；
Temperature control modules, the temperature control modules are used to control environment temperature during test；
Radiation target module, the radiation target module are made up of difference black-body resource and circular hole target, for producing survey
The infra-red radiation target of designated shape needed for examination；
Difference black-body resource temperature controller, the difference black-body resource temperature controller be used for set difference black matrix source temperature from
And control infra-red radiation size；
Parallel light tube, the parallel light tube are used to infra-red radiation caused by radiation target module being changed into collimated light beam confession
Infrared thermoviewer gathers；
Computer, the computer are used to carry out data with difference black-body resource temperature controller and infrared thermoviewer to be measured
Communication, and then difference black matrix source temperature is set and gathers infrared thermoviewer view data；The computer be used for handle it is infrared into
As instrument view data, minimum detectable temperature difference test result is obtained.
Further, described device includes precise rotating platform, the precise rotating platform be used to accurately adjusting infrared thermoviewer into
Image distance walk-off angle degree, so that infrared thermoviewer accurately collects the infra-red radiation of parallel light tube output；The precise rotating platform is by counting
Calculation machine controls；
Further, the temperature control modules are the screened room that may be temperature controlled, other moulds of described device
Block is placed in the screened room；
Further, circular hole target is placed between difference black-body resource and parallel light tube in radiation target module, makes difference black
The infra-red radiation in body source enters parallel light tube after passing through circular hole target；
Further, described device is to circular hole targets in addition to it need to be marked with and computer processing data module makes corresponding modification,
It can be used in the measurement experiment of noise equivalent temperature difference (NETD), minimum resolvable temperature difference (MRTD) and transmission function (MFT).
Beneficial effects of the present invention are：Technical scheme, give a kind of infrared thermoviewer minimum detectable temperature
Poor automatic test approach and device, methods described and device can automatic data collection infrared thermoviewer view data in overall process is measured
And minimum detectable temperature difference is calculated, improve operating efficiency；Manually infrared thermoviewer picture quality need not be assessed, ensured
The accuracy and objectivity of minimum detectable temperature difference measurement result；Present apparatus versatility is high simultaneously, and required device removes circular hole targets
Mark is outer, can be used in NETD, MRTD and MFT measurement of correlation experiment.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is a kind of stream of infrared thermoviewer minimum detectable temperature difference automatic test approach of the specific embodiment of the invention
Cheng Tu；
Fig. 2 is a kind of knot of infrared thermoviewer minimum detectable temperature difference automatic testing equipment of the specific embodiment of the invention
Composition.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is a kind of stream of infrared thermoviewer minimum detectable temperature difference automatic test approach of the specific embodiment of the invention
Cheng Tu, methods described include：
Step 101, circular hole target of the spatial frequency for f is selected, the gain of infrared thermoviewer is arranged to maximum；
Step 102, larger temperature approach is set to make circular hole targets mark blur-free imaging, institute using difference black-body resource temperature controller
State the temperature difference of the temperature difference between target background and difference black-body resource；
Step 103, temperature approach is gradually reduced, the image after reducing every time is gathered and calculates circular hole target image quality, when
When image quality is reduced to M times of blur-free imaging, record temperature approach is Δ T1, wherein 0≤M≤1；
Step 104, continue to reduce temperature approach, gather the image after reducing every time and calculate circular hole target image quality, when
When image quality is M times of blur-free imaging again, record temperature approach is Δ T2, wherein 0≤M≤1；
Step 105, according to Δ T1With Δ T2Calculate minimum detectable temperature difference；
Step 106, the circular hole target of different space frequency is changed, the corresponding different space frequency of the test that repeats the above steps
Minimum detectable temperature difference, and draw the minimum detectable temperature difference curve of tested infrared thermoviewer.
Further, current infrared picture data I is gathered, the maximum entropy threshold of image is calculated and divides the image into as target
Region IoWith background area IbTwo parts, extract target area IoBorder is simultaneously designated as c, calculates girth and area that c encloses region
And be designated as lengt (c) and Area (c) respectively, then image quality QIIt is calculated as follows：
Wherein, target area IoFor circular hole target imaging region, background area IbFor collection image in remove circular hole target into
As the region beyond region；
Further, the circular hole target imaging clearly refers to work as QI>When 0.8, differentiate current infrared picture data I for circle
The clear infrared imaging of hole target, circular hole target imaging region now are designated as
Further, the image quality multiple M=3/4；
Further, when temperature approach often reduces by one time, collection calculates the maximum entropy threshold of image and will schemed as time infrared picture data I '
As being divided into candidate target region I 'ocWith candidate background region IbTwo parts, if candidate target region I 'ocInclude N (N>0) individual mutual not connected region, i.e.,：
I′oc={ c '0..., c 'N, then current circular hole target imaging region
Current circular hole target imaging region I 'oPositioned at blur-free imaging regionInterior part is designated asIt is describedI′oPositioned at blur-free imaging regionOuter part is designated as
It is described Then current circular hole target image quality is QI′Calculate
It is as follows：
Wherein, AIFor total imaging region；
Further, the circular hole target image quality QI′Meet | QI′- M | during ＜ 0.01, then image quality meets clear
M times during quality；
Further, the method for the minimum detectable temperature difference is
Fig. 2 is a kind of knot of infrared thermoviewer minimum detectable temperature difference automatic testing equipment of the specific embodiment of the invention
Composition, described device include：
Optical table 201, the horizontal stable of optical table 201 is without friction, for carrying all devices；
Temperature control modules 202, the temperature control modules 202 are used to control environment temperature during test；
Radiation target module 203, the radiation target module 203 are made up of difference black-body resource and circular hole target, are used for
Produce the infra-red radiation target of the designated shape needed for test；
Difference black-body resource temperature controller 204, the difference black-body resource temperature controller 204 are used to set difference black-body resource
Temperature is so as to controlling infra-red radiation size；
Parallel light tube 205, the parallel light tube 205 are parallel for infra-red radiation caused by radiation target module to be changed into
Light beam gathers for infrared thermoviewer；
Computer 207, the computer 207 are used for and difference black-body resource temperature controller 204 and infrared imaging to be measured
Instrument enters row data communication, and then sets difference black matrix source temperature and gather infrared thermoviewer view data；The computer 207 is used
In processing infrared thermoviewer view data, minimum detectable temperature difference test result is obtained.
Further, described device includes precise rotating platform 206, and the precise rotating platform 206 is used to accurately adjust infrared imaging
The image-forming range and angle of instrument, so that infrared thermoviewer accurately collects the infra-red radiation of parallel light tube output；Described accurate turn
Platform 206 is controlled by computer 207；
Further, the temperature control modules 202 are the screened room that may be temperature controlled, described device other
Module is placed in the screened room；
Further, circular hole target is placed between difference black-body resource and parallel light tube 205 in radiation target module 203, is made
The infra-red radiation of difference black-body resource enters parallel light tube 205 after passing through circular hole target；
Further, described device is to circular hole targets in addition to it need to be marked with and computer processing data module makes corresponding modification,
It can be used in the measurement experiment of noise equivalent temperature difference (NETD), minimum resolvable temperature difference (MRTD) and transmission function (MFT).
Claims (12)
1. a kind of infrared thermoviewer minimum detectable temperature difference automatic test approach, methods described include：
Step 1, circular hole target of the spatial frequency for f is selected, the gain of infrared thermoviewer is arranged to maximum；
Step 2, larger temperature approach is set to make circular hole targets mark blur-free imaging, the temperature difference using difference black-body resource temperature controller
For the temperature difference between target background and difference black-body resource；
Step 3, temperature approach is gradually reduced, the image after reducing every time is gathered and calculates circular hole target image quality, when imaging matter
When amount is reduced to M times of blur-free imaging, record temperature approach is Δ T1, wherein 0≤M≤1；
Step 4, continue to reduce temperature approach, gather the image after reducing every time and calculate circular hole target image quality, when imaging matter
When amount is M times of blur-free imaging again, record temperature approach is Δ T2, wherein 0≤M≤1；
Step 5, according to Δ T1With Δ T2Calculate minimum detectable temperature difference；
Step 6, the circular hole target of different space frequency is changed, the most I of the corresponding different space frequency of the test that repeats the above steps
The temperature difference is detected, and draws the minimum detectable temperature difference curve of tested infrared thermoviewer.
2. according to the method for claim 1, it is characterised in that：Current infrared picture data I is gathered, calculates the maximum of image
Entropy threshold is simultaneously divided the image into as target area IoWith background area IbTwo parts, extract target area IoBorder is simultaneously designated as c, meter
Calculate c to enclose the girth in region and area and be designated as lengt (c) and Area (c) respectively, then image quality QIIt is calculated as follows：
Wherein, target area IoFor circular hole target imaging region, background area IbTo remove circular hole target imaging area in collection image
Region beyond domain.
3. according to the method for claim 1, it is characterised in that：The circular hole target imaging clearly refers to work as QIDuring ＞ 0.8,
It is the clear infrared imaging of circular hole targets target to differentiate current infrared picture data I, and circular hole target imaging region now is designated as
4. according to the method for claim 1, it is characterised in that：The image quality multiple M=3/4.
5. according to the method for claim 1, it is characterised in that：When temperature approach often reduces by one time, time infrared picture data I ' is worked as in collection,
Calculate the maximum entropy threshold of image and divide the image into as candidate target region I 'ocWith candidate background region I 'bTwo parts, if candidate's mesh
Mark region I 'ocComprising the individual mutually not connected regions of N (N ＞ 0), i.e.,：I′oc={ c '0..., c 'N, then current circular hole target imaging regionCurrent circular hole target imaging region I 'oPositioned at clearly into
As regionInterior part is designated asIt is describedI′oPositioned at clear
Imaging regionOuter part is designated asIt is described
Then current circular hole target image quality is QI′It is calculated as follows：
Wherein, AIFor total imaging region.
6. according to the method for claim 1, it is characterised in that：The circular hole target image quality QI′Meet | QI′- M | ＜
When 0.01, then M times when image quality meets clear quality.
7. according to the method for claim 1, it is characterised in that：The method of the minimum detectable temperature difference is
8. a kind of infrared thermoviewer minimum detectable temperature difference automatic testing equipment, described device include:
Optical table, the optical table horizontal stable is without friction, for carrying all devices；
Temperature control modules, the temperature control modules are used to control environment temperature during test；
Radiation target module, the radiation target module are made up of difference black-body resource and circular hole target, and institute is tested for producing
The infra-red radiation target of the designated shape needed；
Difference black-body resource temperature controller, the difference black-body resource temperature controller are used to set difference black matrix source temperature to control
Infra-red radiation size processed；
Parallel light tube, the parallel light tube are used to infra-red radiation caused by radiation target module being changed into collimated light beam for infrared
Imager gathers；
Computer, the computer are used to lead to difference black-body resource temperature controller and infrared thermoviewer to be measured progress data
Letter, and then difference black matrix source temperature is set and gathers infrared thermoviewer view data；The computer is used to handle infrared imaging
Instrument view data, obtain minimum detectable temperature difference test result.
9. device according to claim 8, it is characterised in that：Described device includes precise rotating platform, and the precise rotating platform is used
In the image-forming range and angle of accurately adjustment infrared thermoviewer, so that infrared thermoviewer accurately collects the red of parallel light tube output
External radiation；The precise rotating platform is controlled by computer.
10. device according to claim 8, it is characterised in that：The temperature control modules are that may be temperature controlled
Screened room, other modules of described device are placed in the screened room.
11. device according to claim 8, it is characterised in that：Circular hole target is placed in difference black matrix in radiation target module
Between source and parallel light tube, the infra-red radiation of difference black-body resource is set to enter parallel light tube after passing through circular hole target.
12. device according to claim 8, it is characterised in that：Described device to circular hole targets except that need to be marked with and computer
Processing data module is made outside corresponding modification, can be used in noise equivalent temperature difference (NETD), minimum resolvable temperature difference (MRTD) and pass
In the measurement experiment of delivery function (MFT).
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| CN108897059A (en) * | 2018-06-29 | 2018-11-27 | 北京航天自动控制研究所 | A kind of Infrared Targets imaging detectivity analysis method |
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| CN108896189B (en) * | 2018-06-08 | 2024-10-15 | 中国电力科学研究院有限公司 | Method and system for automatically determining minimum discernable temperature difference of infrared imager |
| CN108897059A (en) * | 2018-06-29 | 2018-11-27 | 北京航天自动控制研究所 | A kind of Infrared Targets imaging detectivity analysis method |
| CN109060144A (en) * | 2018-08-24 | 2018-12-21 | 电子科技大学 | The method that thermal infrared imager NETD is tested automatically |
| CN110095193A (en) * | 2019-05-14 | 2019-08-06 | 武汉高芯科技有限公司 | A kind of thermal infrared imager noise equivalent temperature difference test method and system |
| CN110095193B (en) * | 2019-05-14 | 2021-03-12 | 武汉高芯科技有限公司 | Thermal infrared imager noise equivalent temperature difference testing method and system |
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