CN101576373B - Laser spot collector with low frequency and narrow pulse - Google Patents
Laser spot collector with low frequency and narrow pulse Download PDFInfo
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- CN101576373B CN101576373B CN 200910074771 CN200910074771A CN101576373B CN 101576373 B CN101576373 B CN 101576373B CN 200910074771 CN200910074771 CN 200910074771 CN 200910074771 A CN200910074771 A CN 200910074771A CN 101576373 B CN101576373 B CN 101576373B
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Abstract
The invention relates to a laser spot collector with low frequency and narrow pulse for a laser transmitter. The laser spot collector is formed by connecting the following three parts: a laser attenuating and beam splitting system, an upper converting board CCD collecting system and a computer controlling and processing system. The laser attenuating and beam splitting system is that a bracket is provided with a first attenuation sheet, a second attenuation sheet and a semi-transparent and semi-reflective mirror in sequence along laser incident path. The light transmission surface of the semi-transparent and semi-reflective mirror is arranged by forming a 45-degree angle with laser receiving path; the upper converting board CCD collecting system is that the bracket is provided with an object lens, an upper converting board and a CCD collector in sequence along the reflected path of the semi-transparent and semi-reflective mirror and the upper converting board is adhered on the photosensitive surface of the CCD collector; and the computer used in the computer controlling and processing system is provided with an image grabber. The laser spot collector is characterized by high efficiency and automation, on-line detection capacity, good commonality and high cost performance.
Description
Technical field
Existing laser facula detection method mainly includes ablation method and CCD mensuration etc.The ablation method is to use infrared printing paper to receive laser facula, forms the blackspot of features such as the shape of a reflected laser beam and position on printing paper, measures the parameters such as size of blackspot more by hand.This detection method need be changed a lot of printing paper continuously, complicated operation, and automaticity is low, and measuring accuracy is low.The CCD mensuration is to use charge coupled device ccd to gather laser facula automatically, forms digital picture, carries out subsequent treatment by computing machine again.This detection method has automaticity height, measuring accuracy height, real-time and be easy to realize advantages such as automatic analyzing and processing, is widely adopted at present.
But, the range finder using laser that is equipped with in some laser equipments is to use single laser pulse to find range, what also have some laser equipment uses is that frequency is the low-frequency pulse below tens hertz, and less than tens nanoseconds, wavelength is usually located at infrared band to pulsewidth usually.The pulse laser of this class low frequency, narrow pulsewidth, infrared wavelength, very low to the response sensitivity of charge coupled device ccd, therefore use common CCD to catch this type of pulse laser and have very big difficulty.If use the response speed height,, or adopt the method for synchronized sampling to detect, then will certainly increase the structural complexity of pick-up unit and the design and manufacture cost of pick-up unit the highly sensitive CCD of infrared light.Therefore, to the collection and the detection of this type of pulse laser, also there be not a kind of detection method and pick-up unit of maturation at present.
Summary of the invention
Purpose of the present invention just provides a kind of laser spot collector with low frequency and narrow pulse that can gather the low frequency that sends with the detection laser transmitter, narrow pulsewidth, infrared wavelength laser facula effectively.
The present invention is achieved in that a kind of laser transmitter laser spot collector with low frequency and narrow pulse, this device by laser attenuation and divided beam system, go up change-over panel CCD acquisition system and computer control and disposal system three parts and connect to form;
Described laser attenuation and divided beam system are to be disposed with first attenuator, second attenuator and semi-transparent semi-reflecting lens on laser beam incident road, support upper edge, and the transmission plane of described semi-transparent semi-reflecting lens and laser pick-off light path are the 45 setting;
Described go up change-over panel CCD acquisition system be along the reflected light path of described semi-transparent semi-reflecting lens be disposed with on the support object lens, on change-over panel and CCD collector, the described change-over panel of going up is arranged on converging on the focus of described object lens, and on the photosurface attached to described CCD collector;
Subsidiary in the used computing machine of described computer control and disposal system have an image pick-up card.
The present invention also can realize like this: be connected to laser power detection device on the transmitted light path of the described semi-transparent semi-reflecting lens in described laser attenuation and divided beam system.
The described laser attenuation among the present invention and the major function of divided beam system are that the pulse laser to incident carries out pre-service, power to incident pulse laser is decayed, enable to be in the linear response range of follow-up last change-over panel and CCD collector, so just can make the laser facula that collects undistorted, and the form of as far as possible approaching original hot spot.Laser attenuation and divided beam system are also utilized the semi-transparent semi-reflecting lens in the system that the pulse laser of incident is carried out beam splitting simultaneously and are handled, with when carrying out the laser facula collection, also can utilize the pulse laser of beam splitting to carry out other detections such as laser power etc., make the detection of disparity items can utilize this device while, carry out independently, the online in real time that can realize laser transmitter thus detects, avoid the repeatedly dismounting of different pick-up units, satisfy the needs of fast detecting under the actual combat condition.Utilize laser attenuation and divided beam system among the present invention, can be according to the watt level of incident pulse laser, select the combination of the attenuator of use differential declines multiplying power flexibly, thereby all can finish the detection task, so this device has good versatility multiple laser equipment.
The described described change-over panel of going up in the change-over panel CCD acquisition system of going up among the present invention claims " infrared acquisition switching device " again, have that conversion quantum efficiency height, infrared response time are short, room temperature condition work down, need not freeze, characteristics such as Heat stability is good, the light path that can be applied to multiple infrared lasers such as YAG, GaSi and InGaAsP preferably regulate and facula measurement on.Described CCD collector in this system can be gathered automatically by the laser facula after the last change-over panel conversion, and can form digital picture, enters in the computing machine by image pick-up card.Laser facula after the conversion becomes by the pixel corresponding relation with former laser facula.In general, measurement range, measuring accuracy, sensitivity, response speed etc. are to select the main foundation of CCD collector.The present invention is owing to used last change-over panel, so just can carry out image transitions and time-delay to the pulsed laser spot of low frequency, narrow pulsewidth, infrared wavelength, therefore adopt the CCD collector of common performance also can reach request for utilization, greatly reduce this Design of device and manufacturing cost thus.
Described another characteristics that go up change-over panel CCD acquisition system among the present invention are with on the photosurface of last change-over panel attached to the CCD collector.So just the laser facula of low frequency, narrow pulsewidth, infrared wavelength can be converted to visible light spot, and the time lengthening that this visible light spot is stopped on the conversion surface of last change-over panel, make the CCD collector be easy to collect this visible light spot, this is with regard to the problem that the laser facula that has solved low frequency, narrow pulsewidth, infrared wavelength effectively is difficult to catch, realized laser facula efficient, gather automatically.Last change-over panel has not just had other optical device and optical system attached on the CCD photosurface between the two, can not form aberration, has avoided the influence of aberration to accuracy of detection thus yet.
Described computer control among the present invention and disposal system can be according to laser facula acquisition process softwares, data message to the laser facula that collects by image pick-up card is analyzed and is handled, thereby obtain every detected parameters of laser facula, and can every detection data presentation be come out by display interface.Image pick-up card links to each other with computing machine by USB interface, forms portable Flame Image Process workstation.In addition, computing machine is also controlled the CCD collector.Realized effective detection thus to the pulse laser of laser equipment emission.
Computer control of the present invention and disposal system both can have been done the analysis of whole gatherer process laser facula overall performance for the analysis of laser facula performance parameter, also can do the analysis of any time laser facula parameter.The analysis of laser facula overall performance comprises position of form center, centroid position and the time dependent rule of spot size size etc. of hot spot; The parameter analysis of any time comprises the coordinate of the hot spot centre of form, barycenter, the size of spot size, and content such as spot intensity distribution.
Above-mentioned three systems of the present invention can break away from mutually, are convenient to dismounting and carry; Two attenuators both can be distinguished independent use, also can be used in combination, and to satisfy the needs of different decay multiplying powers, can strengthen the versatility that detects different laser transmitters thus.The present invention can form two independently light paths, work such as laser facula collection that synchronization implementation is online and laser power detection by the beam splitting of semi-transparent semi-reflecting lens paired pulses laser.The work operation of CCD collector both can also can manually be controlled by computer control; By computer control the time, can set the time and the pattern of collection.
Characteristics of the present invention are efficient height, and the automaticity height can onlinely detect, and versatility is good, the cost performance height.
Description of drawings
Fig. 1 is a hardware system structure block diagram of the present invention;
Fig. 2 is the laser attenuation among the present invention and the index path of divided beam system;
Fig. 3 is a system flow block diagram of the present invention.
Embodiment
As shown in Figure 1, hardware system of the present invention by laser attenuation and divided beam system 2, go up change-over panel CCD acquisition system 3 and computer control and disposal system 4 three parts and connect to form.
As shown in Figure 2, laser attenuation and divided beam system 2 are to be disposed with first attenuator 6, second attenuator 7 and semi-transparent semi-reflecting lens 8 on laser beam incident road, support 9 upper edge.First attenuator 6 can screw at the front port of support 9 or screw out, and second attenuator 7 can insert from the openend on support 9 tops or extract.The position of second attenuator 7 abuts against the rear portion of first attenuator 6.Insert under the situation of support 9 at second attenuator 7,, can be fixed second attenuator 7 by inside rotation first attenuator 6.Tilt to be fixed on the semi-transparent semi-reflecting lens 8 in the support 9, its transmission plane and laser pick-off light path are the 45 setting.
The present invention can be according to the concrete watt level of laser transmitter, determine suitable decay multiplying power, select for use different attenuators to carry out independent assortment, the power attenuation that makes pulse laser so just can make the laser facula that collects undistorted as far as possible within the linear working range of last change-over panel and CCD collector.
Among Fig. 1, last change-over panel CCD acquisition system 3 be along the reflected light path of semi-transparent semi-reflecting lens 8 be disposed with on the support object lens 3a, on change-over panel 3b and CCD collector 3c.Last change-over panel 3b is arranged on converging on the focus of object lens 3a, and on the photosurface attached to CCD collector 3c.
The present invention is in computer control and disposal system 4, and image pick-up card is connected to computing machine by the usb interface.
The present invention is connected to laser power detection device 5 on the transmitted light path of the semi-transparent semi-reflecting lens 8 of laser attenuation and divided beam system 2.
Workflow of the present invention is: by the low frequency and narrow pulse laser that low frequency and narrow pulse laser instrument 1 sends, at first enter laser attenuation and divided beam system 2.After the secondary attenuator was decayed to laser power, low frequency and narrow pulse laser incided on the semi-transparent semi-reflecting lens 8, and had formed mutually perpendicular two branch beam optical paths---transmitted light path A and reflected light path B on semi-transparent semi-reflecting lens 8.Concerning the pulse laser of incident, though passed through beam splitting, characteristics such as light distribution do not change, and therefore can carry out hot spot collection and power detection respectively on two light paths.
Incident pulse laser is after decay and beam splitting, and a part enters follow-up last change-over panel CCD acquisition system 3.The branch bundle of pulsed laser that enters this system at first passes through object lens 3a, is imaged on the change-over panel 3b; Last change-over panel 3b is converted to visible light spot with the infrared laser hot spot, and prolongs the residence time of hot spot on last change-over panel 3b, with the response wave band that satisfies CCD collector 3c and the requirement of response speed.
System flow of the present invention as shown in Figure 3, the operation of computing machine is carried out with process software by control.This control and process software were provided with drainage pattern and the acquisition time of CCD collector 3c before this.When the measured laser transmitter was prepared emission pulse laser, computer control and disposal system 4 started the collecting work that CCD collector 3c begins laser facula, and control low frequency and narrow pulse laser instrument 1 emission low frequency and narrow pulse laser.After this, CCD collector 3c is the light spot image data of pulse laser under the continuous recording.When setting-up time one arrives, can stop collecting work automatically.Certainly also can manually control the work start and stop of CCD collector 3c.
Gather the data that form by CCD collector 3c and enter computing machine through image pick-up card, the preservation form has two kinds---and the hot spot digital video is preserved and the hot spot digital picture is preserved.Because the hot spot data processing according to digital picture, therefore need be converted to light spot image information to the hot spot video information of preserving.After converting, just can carry out data analysis and handle.
The performance evaluation of laser facula integral body, be by to the representation of laser facula situation of change in the CCD collector acquisition time, handle out the time dependent change curve of the laser facula centre of form, the time dependent change curve of laser facula barycenter, the time dependent change curve of laser spot size size respectively, and shown by display.
The parameter analysis of laser facula any time, then can select the light spot image in arbitrary moment, processing obtain any time laser spot size, any time hot spot centre of form coordinate, any time the facula mass center coordinate and any time laser facula intensity distribution etc., and show by display.
Claims (2)
1. laser transmitter laser spot collector with low frequency and narrow pulse, described laser is the laser of infrared wavelength, it is characterized in that this device by laser attenuation and divided beam system (2), go up change-over panel CCD acquisition system (3) and computer control and disposal system (4) three parts and connect to form;
Described laser attenuation and divided beam system (2) are to be disposed with first attenuator (6), second attenuator (7) and semi-transparent semi-reflecting lens (8) on laser beam incident road, support upper edge; Described first attenuator (6) can screw at the front port of support or screw out, and described second attenuator (7) can insert from the openend on support top or extract; Described semi-transparent semi-reflecting lens (8) tilts to be fixed in the support, and its transmission plane and laser pick-off light path are the 45 setting;
The described change-over panel CCD acquisition system (3) that goes up is that reflected light path along described semi-transparent semi-reflecting lens (8) is disposed with object lens (3a), goes up change-over panel (3b) and CCD collector (3c) on support, is used for the laser facula of low frequency, narrow pulsewidth, infrared wavelength is converted to visible light spot; The described change-over panel (3b) of going up is arranged on the one-tenth image focus of described object lens (3a), and on the photosurface attached to described CCD collector (3c);
Subsidiary in the used computing machine of described computer control and disposal system (4) have an image pick-up card.
2. laser spot collector with low frequency and narrow pulse according to claim 1 is characterized in that being connected to laser power detection device (5) on the transmitted light path of the described semi-transparent semi-reflecting lens (8) in described laser attenuation and divided beam system (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910074771 CN101576373B (en) | 2009-06-17 | 2009-06-17 | Laser spot collector with low frequency and narrow pulse |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910074771 CN101576373B (en) | 2009-06-17 | 2009-06-17 | Laser spot collector with low frequency and narrow pulse |
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| CN101576373A CN101576373A (en) | 2009-11-11 |
| CN101576373B true CN101576373B (en) | 2010-12-08 |
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| CN 200910074771 Expired - Fee Related CN101576373B (en) | 2009-06-17 | 2009-06-17 | Laser spot collector with low frequency and narrow pulse |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243062B (en) * | 2011-04-13 | 2013-07-31 | 西安理工大学 | Measurement device and method for spot central coordinates of ultra-short pulse laser |
| CN102252690B (en) * | 2011-04-14 | 2013-03-20 | 西安电子科技大学 | Measuring system of relative position of laser mode and aperture and measuring method thereof |
| CN102261952B (en) * | 2011-06-21 | 2013-03-27 | 中国人民解放军济南军区72465部队 | Method and device for detecting spot of single pulse laser with extremely-narrow pulse width |
| CN104251736A (en) * | 2014-09-18 | 2014-12-31 | 武汉凌云光电科技有限责任公司 | On-line power detection method and on-line power detection device for laser |
| CN104990870B (en) * | 2015-04-09 | 2019-05-03 | 中国兵器工业第二0五研究所 | A kind of radiation planar array detector and its scanning stitching image detection system |
| CN105067227B (en) * | 2015-07-31 | 2018-06-26 | 南京理工大学 | A kind of pulse laser far field optical axis stable detecting system |
| CN106271048B (en) * | 2016-08-29 | 2019-06-07 | 大族激光科技产业集团股份有限公司 | Laser processing device and method |
| CN109407076B (en) * | 2018-12-24 | 2023-12-22 | 西安工业大学 | Optical axis detection system and detection method for high-energy pulse laser range finder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6388743B1 (en) * | 1999-07-20 | 2002-05-14 | Duma Optronics, Ltd. | Video laser beam analyzer |
| CN1789947A (en) * | 2005-12-19 | 2006-06-21 | 中国人民解放军总装备部军械技术研究所 | Field online integrated tester for pulse laser emitter |
| CN1800794A (en) * | 2006-01-18 | 2006-07-12 | 中国科学院上海光学精密机械研究所 | Apparatus for measuring quality of laser beam |
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2009
- 2009-06-17 CN CN 200910074771 patent/CN101576373B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6388743B1 (en) * | 1999-07-20 | 2002-05-14 | Duma Optronics, Ltd. | Video laser beam analyzer |
| CN1789947A (en) * | 2005-12-19 | 2006-06-21 | 中国人民解放军总装备部军械技术研究所 | Field online integrated tester for pulse laser emitter |
| CN1800794A (en) * | 2006-01-18 | 2006-07-12 | 中国科学院上海光学精密机械研究所 | Apparatus for measuring quality of laser beam |
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Granted publication date: 20101208 Termination date: 20110617 |