CN100499807C - Signal processing apparatus blanking laser action process and viewing apparatus - Google Patents
Signal processing apparatus blanking laser action process and viewing apparatus Download PDFInfo
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- CN100499807C CN100499807C CNB2006100789060A CN200610078906A CN100499807C CN 100499807 C CN100499807 C CN 100499807C CN B2006100789060 A CNB2006100789060 A CN B2006100789060A CN 200610078906 A CN200610078906 A CN 200610078906A CN 100499807 C CN100499807 C CN 100499807C
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Abstract
The invention relates to a signal processing device which can eliminate function of laser, it includes inverter which inverts the vidicon electronic shutter pulse signal, integrator, scope comparator and benchmark voltage generator; input of said inverter is connected with electronic shutter pulse signal of said vidicon, output of said inverter is the input of said integrator, output of said integrator is connected with said scope comparator, the another input of scope comparator is connected with output of benchmark voltage generator. The invention also relates to observing device of eliminating function of laser that comprises vidicon which is used to screen function course of laser and matter, and monitor which is connected with the vidicon; the electronic shutter pulse signal of said vidicon passes a signal processing device which can eliminate function of laser, then output to a control input terminal of a laser treatment equipment. So, the invention can eliminate the high brightness light noise generated during function course of laser and matter, the laser function course can be observed syllabify.
Description
Technical field
The present invention relates to a kind of signal processing apparatus and finder of blanking laser action process, particularly a kind of when the laser action process being observed by TV monitoring system, the high-luminance light noise that blanking laser and material effect are produced.
Background technology
Laser is meant the light amplification that stimulated radiation produces, and it has characteristics such as high brightness, good directionality, monochromaticjty, and on being easy to focus on it a bit, and in high power density or the energy density of focus place acquisition.When laser action is on metallics, can make its fusing even vaporization: when acting on the nonmetallic substance, can make its carbonization, burning even vaporization; When acting on animal tissue, can make that it solidifies, carbonization even vaporization.Therefore laser is widely used in the materials processing, to object to be processed punch, cut, welding, heat treatment etc.; Equally also be widely used in the medical science, to when injected organism tissue solidify, carbonization or vaporization, make ablation of tissue or cutting and reach the purpose of treatment.The laser of some wavelength can also be used fiber optic transmission, laser is imported the object inner chamber process.
But when observing laser and matter interaction process, run into two problems, the one, laser is very strong, if be the laser of visible light wave range again, eyes are not just seen other objects by the irradiation of the scattered light of light laser.The relatively good solution of this problem, because every kind of laser is single wavelength, as long as filter just passablely with glasses, lasing safety simultaneously also requires to wear the safety goggles of this wavelength laser of filtering.When another problem is light laser and matter interaction, the topical substance temperature is raise rapidly produce burning and send high light, especially when pulse laser, focus place even can produce blast and very strong spark also can make eyes not see the situation and the mechanism of application point.It is very wide that the spectral line of high light is sent in burning and blast, just need wear highdensity sunglasses if filter it, also just cannot see other anything so when filtering high light.Though above-mentioned laser action process is all observed with eyes, when observing with video camera, also can run into same problem, the laser of single wavelength is easy to filter, and the very wide high light of spectral line that sends when laser and matter interaction just is difficult to filter, and therefore existing technology also can't be eliminated the optical noise of the high brightness in the laser action process.
Summary of the invention
The objective of the invention is at when using the TV monitor system to observe pulse laser and matter interaction process, produce the defective of high-luminance light noise in can't blanking laser action process in the prior art, a kind of signal processing apparatus and finder of blanking laser action process are provided, the signal processing apparatus of blanking laser action process and finder, above-mentioned defective can be overcome, thereby the laser action process can be clearly observed.
For achieving the above object, the invention provides a kind of signal processing apparatus of blanking laser action process, be interconnected to constitute by video camera electronic shutter pulse signal is carried out anti-phase inverter, integrator, amplitude comparator and pedestal generator; Wherein, the input of described inverter connects the electronic shutter pulse signal of described video camera, and described inverter is output as the input of integrator, and described integrator output connects amplitude comparator, and another of described amplitude comparator is input as the output of pedestal generator.
The present invention also provides a kind of finder of blanking laser action process, comprises the video camera that is used to take laser and material mechanism, and the monitor that is connected with this video camera; Output to the control input end of a laser equipment after the signal processing means processes of the electronic shutter signal of described video camera through a blanking laser action process; The signal processing apparatus of described blanking laser action process is interconnected to constitute by video camera electronic shutter pulse signal is carried out anti-phase inverter, integrator, amplitude comparator and pedestal generator; Wherein, the input of described inverter connects the electronic shutter pulse signal of described video camera, and described inverter is output as the input of integrator, and described integrator output connects amplitude comparator, and another of described amplitude comparator is input as the output of pedestal generator.
Has electronic shutter in the described video camera, its operation principle is as follows: by controlling the electric charge accumulating time of each pixel, control incident light and realize electronic shutter the action time on video camera CCD chip, promptly export as picture signal at the electric charge that video screen shows only produces a certain period in each, and the charge discharging that all the other times produce is fallen, will not use, so just shortened the time of stored charge, be equivalent to shorten the time of irradiate light on chip, as having added shutter.
When video camera is worked, produce the electronic shutter pulse signal and on the CCD chip stored charge amount, the screen display time relation of the two and described televimonitor is respectively shown in (6-b) among (6-a) and Fig. 6 among Fig. 6.Fig. 6 is the timing variations schematic diagram of each parameter among the present invention, (6-a) is the interior electronic shutter pulse signal of video camera and the screen display time relation schematic diagram of televimonitor among Fig. 6, and (6-b) is the electric charge accumulation of video camera CCD chip and the screen display time relation schematic diagram of televimonitor among Fig. 6.Every of screen display time of described televimonitor is 1/50s, is divided into shutter pulse output time t2 and shutter pulse dwell time t1 two parts, respectively the shut-in time of corresponding shutter and the opening time of shutter.At the t2 of shutter pulse output in the time, the electric charge that accumulates on the described video camera CCD chip all emits, and to stop at shutter pulse be the t1 that opens of shutter in the time, and the CCD chip is to the light integration, and the interaction of laser and material is write down and is converted to image and shows on screen by CCD.The speed of electronic shutter can change at 1/50s～1/100000s.If the t2 time of utilizing electronic shutter to close is exported laser, the high light that produces when laser and laser and matter interaction can not occur on television monitor screen so.
Therefore, the present invention is when using video camera and televimonitor to observe laser and matter interaction process, for example in the occasion of various laser such as Materialbearbeitung mit Laserlicht and laser medicine and matter interaction, can eliminate laser and laser and material and make the high-luminance light interference of noise that the time spent produces, thereby can clearly observe the laser action process.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the schematic diagram of the signal processing apparatus embodiment 1 of blanking laser action process of the present invention;
Fig. 2 is the schematic diagram of the signal processing apparatus embodiment 2 of blanking laser action process of the present invention;
Fig. 3 is the schematic diagram of the embodiment 3 of the finder of blanking laser action process of the present invention;
Fig. 4 is the schematic diagram of the embodiment 4 of the finder of blanking laser action process of the present invention;
Fig. 5 is the schematic diagram of the embodiment 5 of the finder of blanking laser action process of the present invention;
Fig. 6 is the timing variations schematic diagram of each parameter among the present invention.
Description of reference numerals:
The signal processing apparatus of 1-CCD video camera 2-blanking laser action process
3-laser output controller 4-laser
5-televimonitor 6-video luminance signal compensator
7-lighting source 21-switching signal adjuster
A-inverter B-integrator
C-pedestal generator D-amplitude comparator
The E-chip microprocessor
Embodiment
As shown in Figure 1, be an embodiment schematic diagram of the signal processing apparatus of blanking laser action process of the present invention.The electronic shutter pulse signal is anti-phase by inverter A, and the electronic shutter pulse signal waveform after anti-phase is shown in (6-c) among Fig. 6.Fig. 6 is the timing variations figure of each parameter among the present invention, (6-c) is the anti-phase electronic shutter pulse signal in the signal processing apparatus of blanking laser action process and the screen display time relation schematic diagram of televimonitor among Fig. 6, its abscissa is the time, and ordinate is the opposed shutter pulse signal; Electronic shutter pulse signal after anti-phase carries out integration by integrator B to the opposed shutter pulse voltage, integrator B has the function of pulse trailing edge zero clearing output voltage, integrator B output voltage waveforms is shown in (6-d) among Fig. 6, be the screen display time relation schematic diagram of anti-phase electronic shutter pulse signal integration voltage in the signal processing apparatus of blanking laser action process and televimonitor, its ordinate is a magnitude of voltage.Reference voltage takes place in pedestal generator C, sets the peak that reference voltage is slightly larger than shutter closing time integrates device output voltage.Integrator B output voltage and reference voltage compare by amplitude comparator, comparator output low level during greater than reference voltage, comparator output high level during less than reference voltage.The output of amplitude comparator D promptly forms shown in (6-e) among Fig. 6, the screen display time relation schematic diagram of envelope signal of exporting in the signal processing apparatus for blanking laser action process and televimonitor, its ordinate is a magnitude of voltage, promptly control the control signal of Laser emission, and send to laser output controller 3.
The difference of present embodiment and embodiment 1 is to have increased a chip microprocessor E (being that switching signal regulates 21) on the basis of embodiment 1.As shown in Figure 2, profiled pulse signal and electronic shutter pulse signal are handled by chip microprocessor E, in the time of first, and the rolling counters forward electronic shutter pulse signal of chip microprocessor E, the definition umber of pulse of electronic shutter pulse in every, from 1 to N+1.The frequency of electronic shutter pulse is f, optical noise according to laser and matter interaction is determined compression time t ' to the influence time of IMAQ, umber of pulse N ' after the umber of pulse that the umber of pulse of electronic shutter in every deducts the compression time correspondence promptly obtains compressing, formula is as follows:
N′＝(N+1)-t′f
When t ' f was decimal, the value of t ' f was got its integer part and is added 1.Only calculate N ' value in the time of first, laser is not worked, chip microprocessor E keeps N ' value, in the time of later every, envelope level after when chip microprocessor E detects the rising edge of envelope signal output level promptly being compressed is put height, when chip microprocessor E detects the individual shutter pulse of N ', put low-output signal, promptly obtained the envelope signal behind the compression pulse width.This control signal has guaranteed that the optical noise that laser and matter interaction process produce finishes before electronic shutter is opened.If laser 4 was output as continuous laser originally, the laser output of controlling behind switching signal adjuster 21 compression pulse widths just becomes the waveform shown in (6-g) among Fig. 6, laser output waveform when being continuous laser after the modulation of switching signal adjuster for laser, its ordinate is a power output; If laser 4 was output as pulse laser originally, the laser output of controlling behind switching signal adjuster 21 compression pulse widths just becomes the waveform shown in (6-h) among Fig. 6, laser output waveform when being pulse laser after the modulation of switching signal adjuster for laser, its ordinate is the output energy value, its intrinsic laser pulse repetition frequency is constant, and just pulse laser output is stopped before electronic shutter is opened.
As shown in Figure 3, be an embodiment schematic diagram of the finder of blanking laser action process of the present invention.Wherein 1 pair of laser of ccd video camera and matter interaction process are taken, and the picture that photographs passed to televimonitor 5, the signal processing apparatus 2 that is connected in the blanking laser action process of video camera 1 takes out the electronic shutter pulse signal and is handled from video camera 1.The electronic shutter pulse signal is anti-phase by inverter A, and the electronic shutter pulse signal waveform after anti-phase is shown in (6-c) among Fig. 6.Electronic shutter pulse signal after anti-phase carries out integration by integrator to the opposed shutter pulse voltage, and integrator has the function of pulse trailing edge zero clearing output voltage, and the integrator output voltage waveform is shown in (6-d) among Fig. 6.Pedestal generator generation reference voltage is set the peak that reference voltage is slightly larger than shutter closing time integrates device output voltage.Integrator output voltage and reference voltage compare by amplitude comparator, comparator output low level during greater than reference voltage, comparator output high level during less than reference voltage.The output of amplitude comparator promptly forms the envelope signal shown in (6-e) among Fig. 6, promptly controls the control signal of Laser emission, and sends to laser output controller 3.
As shown in Figure 4, be the signal processing apparatus of blanking laser action process of the present invention and another embodiment schematic diagram of finder.Because the burning that laser and matter interaction process produce or the spark of blast always just take place behind material at the laser output action, promptly lag behind laser and have certain luminescent lifetime.Embodiment 1 can fully eliminate the influence of the optical noise of laser, also can eliminate the spark noise of following laser output in a large number and producing, but the optical noise that the terminal laser of laser output and matter interaction produce in the time of can not eliminating electronic shutter and be about to open, the time that this spark will enter the electronic shutter unlatching forms optical noise on display screen.Just must stop laser output according to the luminescent lifetime length of spark in advance in order to address this problem.
Specific implementation method as shown in Figure 4, between the signal processing apparatus 2 of blanking laser action process and laser output controller 3, set up a switching signal adjuster 21, its function is according to the luminescent lifetime length of spark the width of the profiled pulse signal of signal processing apparatus 2 outputs of blanking laser action process to be compressed processing, envelope signal behind the compression pulse width just becomes the control signal of working control laser output, shown in (6-f) among Fig. 6.Profiled pulse signal and electronic shutter pulse signal are handled by chip microprocessor E, in the time of first, the rolling counters forward electronic shutter pulse signal of microprocessor, the definition umber of pulse of electronic shutter pulse in every, from 1 to N+1.The frequency of electronic shutter pulse is f, optical noise according to laser and matter interaction is determined compression time t ' to the influence time of IMAQ, umber of pulse N ' after the umber of pulse that the umber of pulse of electronic shutter in every deducts the compression time correspondence promptly obtains compressing, formula is as follows:
N＝(N+1)-t′f
When t ' f was decimal, the value of t ' f was got its integer part and is added 1.Only calculate N ' value in the time of first, laser is not worked, the little processing calculator of monolithic keeps N ' value, in the time of later every, envelope level after when the little processing calculator of monolithic detects the rising edge of envelope signal output level promptly being compressed is put height, when the little processing calculator of monolithic detects the individual shutter pulse of N ', put low-output signal, promptly obtained the envelope signal behind the compression pulse width.This control signal has guaranteed that the optical noise that laser and matter interaction process produce finishes before electronic shutter is opened.If laser was output as continuous laser originally, the laser output of controlling behind switching signal adjuster 21 compression pulse widths just becomes the waveform shown in (6-g) among Fig. 6, if laser was output as pulse laser originally, the laser output of controlling behind switching signal adjuster 21 compression pulse widths just becomes the waveform shown in (6-h) among Fig. 6, its intrinsic laser pulse repetition frequency is constant, and just pulse laser output is stopped before electronic shutter is opened.Other mechanism and embodiment 3 are identical, repeat no more.
As shown in Figure 5, be the signal processing apparatus of blanking laser action process of the present invention and another embodiment schematic diagram of finder.In the above-described embodiments, owing to used electronic shutter just to produce two problems.The one, added the control of envelope signal to laser output after, increased the time that laser pauses, be equivalent to reduce average power or the energy of laser output.If the time that electronic shutter is opened is 1/50s, promptly be equivalent in every the electronic shutter All Time and all open, there is not laser output this moment; If the time that electronic shutter is opened is 1/100s, promptly being equivalent to electronic shutter has the time of half to open in every 1/50s, and the average power or the energy of laser output have just reduced half after envelope signal control so; If the time that electronic shutter is opened is 1/1000s, promptly be equivalent to electronic shutter and in every 1/50s, have only time of 5% to open, average power or the energy through the laser output of envelope signal control back just only reduced 5% so.Therefore, in order to reduce the electronic shutter that the influence of laser output average power or energy is just needed selected fair speed, for example electronic shutter is set at 1/1000s.But, produced another problem thereupon, be that the electronic shutter opening time is short more, time for exposure to the laser action position is short more, the interaction process of laser and material has not just seen Chu, in order to address this problem the illumination that just needs to increase the laser action position, promptly give the illumination that affords redress of laser action position.
Specific implementation method connects video luminance signal compensator 6 as shown in Figure 5 outside video camera 1, video luminance signal compensator 6 connects lighting source 7 again.Described video luminance signal compensator 6 extracts from video camera and monitoring video signal brightness, along with the increase and decrease of video luminance signal is sent compensating signal to lighting source 7, the control lighting source reduces or increases illumination and throws light on automatically to satisfy because of electronic shutter speed changes needed thing field.When using endoscope to carry out laser surgey in body cavity, lighting source 7 is exactly a cold light source.Certainly, if electronic shutter speed does not often change after selected, also can compensate control automatically, and adjust the illumination of thing field, get final product so that on television monitor screen, obtain the image of appropriate brightness with manual way without 6 pairs of lighting sources 7 of video luminance signal compensator.Other mechanism and embodiment 4 are identical, repeat no more.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (8)
1. the signal processing apparatus of a blanking laser action process is characterized in that: be interconnected to constitute by video camera electronic shutter pulse signal is carried out anti-phase inverter, integrator, amplitude comparator and pedestal generator; Wherein, the input of described inverter connects the electronic shutter pulse signal of described video camera, and described inverter is output as the input of integrator, and described integrator output connects amplitude comparator, and another of described amplitude comparator is input as the output of pedestal generator.
2. the signal processing apparatus of blanking laser action process according to claim 1, it is characterized in that: also comprise the switching signal adjuster that is used to adjust the profiled pulse signal width, one signal of described switching signal adjuster is input as the signal output of described amplitude comparator, and another signal of described switching signal adjuster is input as the electronic shutter pulse signal of described video camera.
3. the finder of a blanking laser action process comprises the video camera that is used to take laser and material mechanism, and the monitor that is connected with this video camera; It is characterized in that: the control input end that outputs to a laser equipment after the signal processing means processes of the electronic shutter signal of described video camera through a blanking laser action process; The signal processing apparatus of described blanking laser action process is interconnected to constitute by video camera electronic shutter pulse signal is carried out anti-phase inverter, integrator, amplitude comparator and pedestal generator; Wherein, the input of described inverter connects the electronic shutter pulse signal of described video camera, and described inverter is output as the input of integrator, and described integrator output connects amplitude comparator, and another of described amplitude comparator is input as the output of pedestal generator.
4. the finder of blanking laser action process according to claim 3, it is characterized in that: the signal processing apparatus of described blanking laser action process also comprises: the switching signal adjuster that is used to adjust the profiled pulse signal width, one signal of described switching signal adjuster is input as the signal output of described amplitude comparator, and another signal of described switching signal adjuster is input as the electronic shutter pulse signal of described video camera.
5. according to the finder of claim 3 or 4 described blanking laser action process, it is characterized in that: described video camera also is connected with a video luminance signal compensator, the output of this video luminance signal compensator is connected with lighting source, and illumination is used to afford redress.
6. the finder of blanking laser action process according to claim 5, it is characterized in that: described lighting source is ordinary light source or cold light source.
7. according to the finder of claim 3 or 4 described blanking laser action process, it is characterized in that: described laser equipment is connected and composed by laser and laser output controller, the input of described laser output controller connects the output of the signal processing apparatus of described blanking laser action process, and the output signal of described laser output controller connects described laser.
8. the finder of blanking laser action process according to claim 7 is characterized in that: described laser is continuous wave laser or the pulse laser that industrial processes or Medical Devices use.
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| CNB2006100789060A CN100499807C (en) | 2006-04-27 | 2006-04-27 | Signal processing apparatus blanking laser action process and viewing apparatus |
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Address after: 100010 Beijing city Dongcheng District North Street No. 20 Patentee after: Beijing Jingyi Photoelectric Technology Research Institute Co.,Ltd. Address before: 100010 Beijing city Dongcheng District North Street No. 20 Patentee before: Beijing Institute of Opto-Electronic Technology |
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