CN105943183B - Infrared thermal wave imaging detection device based on heterodyne method - Google Patents
Infrared thermal wave imaging detection device based on heterodyne method Download PDFInfo
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- CN105943183B CN105943183B CN201610262929.0A CN201610262929A CN105943183B CN 105943183 B CN105943183 B CN 105943183B CN 201610262929 A CN201610262929 A CN 201610262929A CN 105943183 B CN105943183 B CN 105943183B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/04—Measuring instruments specially adapted for dentistry
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Abstract
The invention discloses a kind of infrared thermal wave imaging detection device based on heterodyne method, described device includes computer, two-way function generator, frequency mixer, laser and infrared camera, and computer control two-way function generator produces two amplitudes sinusoidal modulation signal different from biasing identical, frequency；Two-way function generator inputs the sinusoidal signal of two frequencies to frequency mixer；The output end of frequency mixer controls laser to produce the laser containing mixed modulated signal to detecting that exemplar enters row energization all the way, and another road triggering infrared camera carries out the synchronous acquisition of image sequence；The image sequence of collection is fed back to computer by infrared camera, and computer is by the image sequence collected and the difference frequency signal Δ of two frequenciesfLock phase computing is done, to obtain the optical heat radiation signal amplitude figure and phase diagram of detection exemplar.The high-resolution of the achievable tooth early-stage caries of the present invention and high s/n ratio detection, detection process substantially increase detection efficiency and the degree of accuracy entirely without damage, noncontact.
Description
Technical field
The present invention relates to a kind of infrared thermal wave imaging detection device, it is adaptable to the defect recognition of medical domain Tooth tissue
With detection.
Background technology
In medical domain, carious tooth is a kind of frequently-occurring disease, it is generally recognized that by bacterium, environment, host and time etc. because
Enter lesions when hard tooth tissue is dynamic caused by plain, if Clinics and Practices not in time, carious tooth forms cavity by development is continued, most
Make loss of tooth eventually.Therefore, find that a kind of detection speed is fast, detection resolution is high and undamaged detection method is realized to tooth
The detection that dental caries are damaged is most important.In field of non destructive testing, infrared thermal wave image checking has noncontact, not damaged, directly perceived, detection
The advantage such as area is big and efficiency is high, therefore, infrared thermal wave imaging detection method is before medical science has a wide range of applications
Scape.
Infrared camera is infrared thermal wave image-forming detecting system core component, and due to the limitation of infrared camera frequency acquisition,
Traditional infrared thermal wave imaging detection method can only be encouraged using the modulated excitation thermal source of lower frequency to exemplar, cause heat wave
Thermal diffusion length is longer so that traditional infrared thermal wave imaging detection method is not high to tooth early-stage caries detection resolution.
The content of the invention
The purpose of the present invention is to overcome current infrared thermal imaging testing method relatively low to tooth early-stage caries detection resolution
Not enough there is provided a kind of infrared thermal wave imaging detection device based on heterodyne method.
The purpose of the present invention is achieved through the following technical solutions：
A kind of infrared thermal wave imaging detection device based on heterodyne method, including computer, two-way function generator, mixing
Device, laser and infrared camera, wherein：
The computer control two-way function generator produces two amplitudes Sine Modulated different from biasing identical, frequency
Signal；
The two-way function generator inputs the sinusoidal signal of two frequencies to frequency mixer；
The output end of the frequency mixer controls laser to produce the laser containing mixed modulated signal to detection exemplar all the way
Enter row energization, another road triggering infrared camera carries out the synchronous acquisition of image sequence；
The image sequence of collection is fed back to computer by the infrared camera, and computer is by the image sequence collected and two
The difference frequency signal Δ of individual frequencyfLock phase computing is done, to obtain the optical heat radiation signal amplitude figure and phase diagram of detection exemplar.
The invention has the advantages that：
1st, high-resolution and the high s/n ratio detection of tooth early-stage caries can be realized；
2nd, detection process substantially increases detection efficiency and the degree of accuracy entirely without damage, noncontact；
3rd, by carrying out the high resolution identification that active heat wave encourages achievable defect type and position to detection exemplar.
Brief description of the drawings
Fig. 1 is the structural representation based on heterodyne method infrared thermal wave imaging detection device；
Fig. 2 is the modulated signal schematic diagram after being mixed through frequency mixer；
Fig. 3 is detection exemplar optics picture；
Fig. 4 is final detection defect result schematic diagram, a）Phase diagram, b）Amplitude figure.
Embodiment
Technical scheme is further described below in conjunction with the accompanying drawings, but is not limited thereto, it is every to this
Inventive technique scheme is modified or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, all should be covered
In protection scope of the present invention.
Embodiment one：As shown in figure 1, present embodiment provide based on heterodyne method infrared thermal wave image checking dress
Put including computer 1, two-way function generator 5, frequency mixer 6, laser 8, optical fiber 9, collimating mirror 10, the three-dimensional mobile station of exemplar
12nd, the three-dimensional mobile station 15 of collimating mirror optical bracket 13, infrared camera 14, infrared camera, wherein：
It is identical with biasing, frequently that the computer 1 controls two-way function generator 5 to produce two amplitudes by USB connecting lines 2
The different sinusoidal modulation signal of rate；
The two-way function generator 5 is through the first BNC connecting lines 3 and the 2nd BNC connecting lines 4 by two sinusoidal modulation signals
Input to frequency mixer 6, the output end of frequency mixer 6 controls the generation of laser 8 to be adjusted containing mixing by the 3rd BNC connecting lines 7 all the way
The laser of signal processed enters row energization to the detection exemplar 11 being fixed in the three-dimensional mobile station 12 of exemplar, and another road passes through the 4th BNC
The control of connecting line 16 infrared camera 14, infrared camera 14 carry out the synchronous acquisition of image sequence according to acquisition instructions；
The infrared camera 14 is fixed in the three-dimensional mobile station 15 of infrared camera, and infrared camera 14 is by the image sequence of collection
Computer 1 is fed back to by netting twine 17, computer 1 is by the image sequence collected and the difference frequency signal Δ of two frequenciesfDo and lock
Phase computing, to obtain the optical heat radiation signal amplitude figure and phase diagram of detection exemplar 11, and then judges to detect lacking for exemplar 11
Fall into type and position；
Repeat to change the position for detecting exemplar 11, pass through the amplitude for the optical heat radiation signal for obtaining each region of detection exemplar 11
Defective locations are identified and detected with phase information.
The present invention is the light-heat radiation survey principle based on heterodyne method, and computer 1 controls two-way function through USB connecting lines 2
Generator 5 produces two amplitudes sinusoidal modulation signal different from biasing identical, frequency；Two-way function generator 5 is through the first BNC
The BNC connecting lines 4 of connecting line 3 and the 2nd input two sinusoidal modulation signals to frequency mixer 6, and the output end of frequency mixer passes through all the way
3rd BNC connecting lines 7 control laser 8 produces the laser containing mixed modulated signal, is converged by optical fiber 10, collimated mirror 9
Enter row energization to detection exemplar 11 to the detection surface of exemplar 11, the laser of modulation variation is irradiated to after detection exemplar 11 due to existing
There is temperature fluctuation and infra-red radiation, optical heat radiation signal and detection exemplar Photothermal characterisation parameter in photo-thermal effect, detection exemplar 11
Correlation, signal is gathered by infrared camera 14, generates the difference frequency of image sequence, the image sequence of acquisition and two sinusoidal signal frequencies
ΔfReference signal do lock phase computing, the method can realize high-resolution and the high noise to detecting the surface defect of exemplar 11
Than detection.
Specific implementation step is as follows：
Step 1, the determination detection exemplar 11 to be measured, detection exemplar 11 is placed into the three-dimensional mobile station 12 of exemplar；
Step 2, unlatching are based on heterodyne method infrared thermal wave imaging detection device, and this step includes computer 1, two-way function and sent out
The unlatching of the equipment such as raw device 5, frequency mixer 6, laser 8, infrared camera 14；
Step 3, by observing computer 1 judge that whether rationally infrared camera 14 focuses, it is mobile by adjusting exemplar three-dimensional
Platform 12 and the three-dimensional mobile station 15 of infrared camera make image imaging clearly；
It is identical with biasing, frequently that step 4, computer 1 control two-way function generator 5 to produce two amplitudes through USB connecting lines 2
Rate is respectivelyf 1Withf 2Sinusoidal modulation signal；Two-way function generator 5 will through the first BNC connecting lines 3 and the 2nd BNC connecting lines 4
Two sinusoidal modulation signals are inputted to frequency mixer 6；
Step 5, the output end of frequency mixer 6 control laser 8 to produce containing mixing tune by the 3rd BNC connecting lines 7 all the way
The laser of signal processed enters row energization to detection exemplar 11, while infrared camera 14 is triggered in another road by the 4th BNC connecting lines 16
Carry out image sequence acquisition；
The image sequence that step 6, infrared camera 14 are gathered feeds back to computer 1 by netting twine 17, and computer 1 will be collected
Image sequence and two frequencies difference frequency signal ΔfLock phase computing is done, to obtain the optical heat radiation signal amplitude of detection exemplar
Figure and phase diagram, and then judge to detect defect type and the position of exemplar 11；
Step 7, the three-dimensional mobile station 12 of adjustment exemplar make detection exemplar 11 to another test position；
Step 8,3~step 7 of repeat step, complete to use based on heterodyne method infrared thermal wave imaging detection device to exemplar
Detection process.
Embodiment two：In present embodiment, the mankind with crackle are damaged on detection exemplar 11 selection surface without obvious dental caries
Dental tissue.By its a certain position with after tooth erosion agent acid etching 5min, the infrared thermal wave image checking based on heterodyne method is carried out,
Wherein, the sinusoidal modulation signal of two frequencies is respectively set toy 1=A 1sin(2πf 1 t),y 2=A 2sin(2πf 2 t), it is mixed through frequency mixer
Modulated signal after frequency isy=A 1 A 2/2[cos(f 1+f 2)-cos(f 1-f 2)].Modulated signal after mixing is as shown in Figure 2.Fig. 2
In,A 1=A 2=1；f 1=110Hz；f 2=100Hz.Preheating 5 minutes is needed before being tested every time.Test specimen testing result is as shown in Figure 4.
Go out dental caries damage position from the figure 3, it may be seen that the optics picture for damaging exemplar by tooth dental caries is difficult identifying and diagnosing, but in Fig. 4
Tooth dental caries damage the amplitude figure of exemplar and phase diagram understands that the infrared thermal wave imaging detection device based on heterodyne method can be with high-resolution
Detect tooth early-stage caries high s/n ratio.
Claims (3)
1. a kind of infrared thermal wave imaging detection device based on heterodyne method, it is characterised in that described device includes computer, two-way
Function generator, frequency mixer, laser and infrared camera, wherein：
The computer control two-way function generator, which produces two amplitudes Sine Modulated different from biasing identical, frequency, to be believed
Number；
The two-way function generator inputs the sinusoidal modulation signal of two frequencies to frequency mixer；
The output end of the frequency mixer controls laser to produce the laser containing mixed modulated signal to detection exemplar progress all the way
Excitation, another road triggering infrared camera carries out the synchronous acquisition of image sequence；
The image sequence of collection is fed back to computer by the infrared camera, and computer is by the image sequence collected and two frequencies
The difference frequency signal Δ of ratefLock phase computing is done, to obtain the optical heat radiation signal amplitude figure and phase diagram of detection exemplar.
2. the infrared thermal wave imaging detection device according to claim 1 based on heterodyne method, it is characterised in that described device
Also include collimating mirror, the collimated mirror of the laser containing mixed modulated signal converges to detection sample surface and detection exemplar is swashed
Encourage.
3. the infrared thermal wave imaging detection device according to claim 1 based on heterodyne method, it is characterised in that described device
Also include the three-dimensional mobile station of exemplar and the three-dimensional mobile station of infrared camera, detection exemplar is fixed on the three-dimensional mobile station of exemplar, infrared phase
Machine is fixed on the three-dimensional mobile station of infrared camera, by adjust the three-dimensional mobile station of exemplar and the three-dimensional mobile station of infrared camera make image into
As clear.
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| CN106404835B (en) * | 2016-09-13 | 2019-04-09 | 哈尔滨工业大学 | A kind of infrared relevant thermal wave imaging system and the detection method based on the system |
| CN109211976A (en) * | 2018-08-07 | 2019-01-15 | 哈尔滨商业大学 | Semi-conductor silicon chip surface/sub-surface micro-cracks damage chirp beam splitting laser excitation infrared thermal wave detection device and method |
| CN109238968A (en) * | 2018-10-23 | 2019-01-18 | 哈尔滨工业大学 | A kind of photo-thermal heterodyne micro-imaging detection system and method |
| CN114441598B (en) * | 2022-04-11 | 2022-07-08 | 胜科纳米(苏州)股份有限公司 | 3D stacked and packaged integrated circuit chip and failure positioning method and device thereof |
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