Newport LBP2 Series Скачать руководство пользователя страница 78

Страница: 78 / 103

LBP2 User Guide

Document No: 50306-001

Rev G 3/12/2020

Page 78

Beam Width Measurements Using Knife-Edge Techniques by Siegman,

Sasnett and Johnston.

A user programmable method is also provided for users that wish to tune

the process to best model their beam’s mode content.

The ISO 16/84 method presets the Clip% values to 16% and 84% respectively,

and the Multiplier to 2.0. Best for beams that are mostly TEM

The 10/90 method presets the Clip% values to 10% and 90% respectively, and

the Multiplier to 1.561. These are the recommended values based upon the above

Siegman, et al. paper, and are very compatible with CCD camera noise figures.

These values are perfectly correct for computing an equivalent second moment

width for TEM

beams, and are a good approximation for many beams of mixed

modes.

The third Knife Edge selection will allow programming the Clip% and Multiplier

values. To use this option successfully requires advanced knowledge of the beams

modal content.

All Knife Edge Diameters are the computed average of the orthogonal beam

widths.

When rotated beam results are disabled, the computed beam widths will be

aligned with a pair of simulated knife-edges cutting one in each of the X and Y

directions. Hence, the displayed beam widths will be indicated in the results

window as X and Y. If the laser beam is not radially symmetric but does contain
two axes of symmetry, rotate the beam such that the beam's axes align with the X

and Y axes of the display.

When rotated beam results are enabled, the computed beam widths will be

aligned with a pair of simulated knife-edges cutting one in each of the Major and

Minor axial directions. Hence, the displayed beam widths will be indicated in the

results window as M/Major and m/minor. The implication is that the displayed

values represent the major and minor widths of an elliptically shaped laser beam.

Note: Rotated beam results are enabled whenever one of the following results items

are enabled: Orientation, Ellipticity, Eccentricity.

5.9.3

Percent of Total Power/Energy Method

D%tX/M, D%tY/m, D%t

LBP2 measures the lengths of two orthogonal lines that pass through the beam

centroid. The beam widths are determined by separately looking out along each

line and count all the pixels that are greater than the set clip level. The reported

beam widths are the number of pixels greater than the clip level multiplied by the

pixel pitch.

Содержание LBP2 Series

Страница 1: ...LBP2 User Guide Document No 50306 001 Rev G 3 12 2020 Page 1 Laser Beam Profiler User Guide for v3 x Laser Beam Analyzer For Windows 7 and Windows 10 LBP2 Series...

Страница 2: ...nty The above warranties do not apply to products which have been repaired or modified without Newport s written approval or products subjected to unusual physical thermal or electrical stress imprope...

Страница 3: ...obtain a Return Material Authorization Number RMA Return the product to Newport Corporation freight prepaid clearly marked with the RMA and we will either repair or replace it at our discretion Newpor...

Страница 4: ...Newport Corporation Newport Corporation reserves the right to make improvements to the product described in this user guide at any time and without prior notice While every precaution has been taken i...

Страница 5: ...ser Setup 16 1 5 2 Pulsed Laser Setup 16 1 6 Saving The Setup 17 CHAPTER 2 LBP2 Operating Controls 18 2 1 Title Bar Features 18 2 1 1 Default PDF Viewer 19 2 1 2 Adobe Reader XI Problem 20 2 2 Source...

Страница 6: ...2 3 Beam Display Ribbon and Panel Controls 27 2 3 1 2D 3D Properties 28 2 3 2 2D Beam Display Window 29 2 3 3 3D Beam Display Window 30 2 3 4 Cursor 31 2 4 Capture Ribbon and Controls 31 2 4 1 Process...

Страница 7: ...2 5 2 4 Programmable Moving Slit of Peak 36 2 5 3 Optical Scaling 36 2 5 4 Pass Fail 37 2 5 5 Statistics 37 2 6 Results Display Controls 39 2 6 1 Group Statistics 40 2 6 2 Drag and Drop 40 2 6 3 Resul...

Страница 8: ...52 3 2 1 The Primary Dock Window and Dock Handles 53 3 2 2 Dock Handle Cloning 56 3 2 3 Pin 56 3 3 Status Bar 58 CHAPTER 4 Files and Formats 60 4 1 LBP2 File Types 60 4 2 Setup Files lbp2Setup HDF5 6...

Страница 9: ...8 Centroid Location 75 5 9 Beam Widths and Diameters 75 5 9 1 D4 Sigma Method 76 5 9 2 Knife Edge Method 77 5 9 3 Percent of Total Power Energy Method 78 5 9 4 Percent of Peak Method 79 5 9 5 Moving S...

Страница 10: ...protective equipment Unless the laser s optical path is enclosed the user should be protected against accidental exposure Exposure to personnel other than the user must also be considered Hazards inc...

Страница 11: ...ailable on most all measured parameters Support for USB SPxxx series cameras Supports satellite windows on multiple monitors Continuous zoom scaling in both 2D and 3D Results logging capabilities expo...

Страница 12: ...quirements vary greatly depending upon application Newport offers optional equipment for beam attenuation Information for the LBP2 Beam Sampler series is shown below Consult your Newport Representativ...

Страница 13: ...lecting useful beam data for the first time user Chapter 2 LBP2 Operating Controls Describes all the various displays control panels menus and dialog boxes in detail along with configuration considera...

Страница 14: ...pplied CD into the CD ROM drive and wait for the Newport Software Auto Install screen to appear b Click on the Software Install button c Follow the directions that appear on the screen 2 If the comput...

Страница 15: ...f the camera is licensed for use with LBP2 its model and serial number will appear in a dropdown list Click on the camera to connect it to the LBP2 application The camera controls will appear in the r...

Страница 16: ...e laser pointer is a good type of beam to practice with If the laser has a high rep rate pulsed output pulsing much faster than the camera frame rate then to the camera it may appear more like a CW ou...

Страница 17: ...be remembered by the application and will be the new default setup the next time LBP2 is launched This last used last saved Feature is also user specific meaning that the last used or last saved file...

Страница 18: ...button Quick Access Toolbar The three buttons shown here are from left to right o Start Pause data collection or replay control o Perform an Ultracal o Enable Disable Auto aperture Application name an...

Страница 19: ...items in the Windows task bar and can be inadvertently lost in a busy desktop with many open applications Use them prudently Status Bar The bottom line of the LBP2 application contains a number of di...

Страница 20: ...with the newest release of Adobe Reader XI This is caused by a security feature that is included in Adobe Reader XI and probably to future releases of Adobe Reader To enable What s This help to opera...

Страница 21: ...number Click on the device to connect to the application Upon launching LBP2 it will attempt to connect cameras in the following order 1 The camera model and serial number specified in the currently...

Страница 22: ...ccurate baseline calibration of the camera to be performed Ultracal will preserve both the positive and negative noise floor and when utilized in conjunction with Auto Aperture will result in the most...

Страница 23: ...ll enter an Auto Xposure mode and make the Exposure Gain and Black Level EGB controls switch into an auto tracking mode Previous Ultracal processing will be disabled and a new automatic baseline subtr...

Страница 24: ...rious cameras have greater or lesser features in this area The cameras that Newport uses with LBP2 have some degree of format control The types of controls appearing here are as follows Frame Format T...

Страница 25: ...frame of data when a trigger pulse is sent to the camera If a delay in the start of exposure time is needed enter the delay time in the adjacent edit box Delay time is programmable in milliseconds o...

Страница 26: ...elay for these cameras can be either positive or negative depending upon the duration of the laser pulse If the pulse is short 100us set a negative delay of at least 1 0ms and a camera exposure time o...

Страница 27: ...as well as the firmware versions running in the camera 2 2 2 8 Video Trigger This dropdown control will enable and set the threshold for the Video Trigger This feature permits only those frames of dat...

Страница 28: ...play window Enable Disable Beam Profiles When the Cursors are present they define a 1D Slice thru the beam intensity profile When On this control will project the slice profiles along the bottom and l...

Страница 29: ...rofile is drawn in White The 2D Beam Display is shown in the Primary Dock Window indicated by the presence of the upper identifying tab Manual Aperture is not enabled The small red circle just visible...

Страница 30: ...mount of detail that will be rendered in the 3D beam profile A number 1 is finest resolution and will cause the data frames to update at a slower rate The max value is 10 and will result in a more gra...

Страница 31: ...indicated Centroid The Cursor will automatically track the location of the computed beam Centroid 2 4 Capture Ribbon and Controls The Capture Ribbon provides many of the standard controls for managing...

Страница 32: ...and at the top of a Report that contains a frame with a comment attached Comments cannot be applied to write protected frames Comments can be attached four different ways Comment current Attach the c...

Страница 33: ...m is not saturated If this is not feasible Smear Correction can be enabled to correct for the smearing mathematically If Smear Correction is applied successfully a green indicator illuminates in the s...

Страница 34: ...in counts Apply Calibration To calibrate the beam enter the Power Energy value in the edit control select the appropriate units and click Apply The frame currently being displayed will be assigned th...

Страница 35: ...em choices require additional input parameters in order for them to be correctly and meaningfully applied The required input parameters can be entered here The factory default settings are shown below...

Страница 36: ...will define the clip level for computing the beam widths and diameters using this method 13 5 is the default setting and represents the second moment setting for a TEM00 Gaussian beam This method assu...

Страница 37: ...ion Select which pass fail condition to apply an action on on Pass on Fail no Action Above indicates to take action on Fail The possible Actions are TTL Pulse output from a USB adapter on each actiona...

Страница 38: ...r of frames to collect and report the results on Data collection will stop after the set number of frames are collected Running Window This method allows statistics to be recomputed continuously but o...

Страница 39: ...number of embedded controls Results groups as well as the individual Results items have dropdown controls that select which results items are to be enabled computed as well as other related features s...

Страница 40: ...l item s that are to be compute and displayed Observe that the Sample Size must be enabled for each item When each item is enabled the sample size for that item resets The easiest way to get all resul...

Страница 41: ...esults item will float in the designated display window with a transparent background To reposition the location of the item use the mouse to drag and drop it to a new location To delete the floating...

Страница 42: ...tions to open the dialog box The Display Options can be changed for all results at once by clicking at the top of the Results window Set the font size color and the number of decimal places to be disp...

Страница 43: ...nditions In the above example the Pass condition is that the Total power must be greater than or equal to 500 Watts Observe that the Units selected define the pass fail units When the results fail the...

Страница 44: ...and Auto Aperture limit the region where data is analyzed and the results computed The Beam Width aperture is a display device that indicates the size and approximate location and orientation of the...

Страница 45: ...ements as it can aid in reducing the impact of noise in the wings of the beam Wing noise can cause the computed second moment results to become very unstable The smaller the beam relative to the displ...

Страница 46: ...release of LBP2 v3 3 the algorithm that places the Auto Aperture has changed This new algorithm makes it much easier for the aperture to locate the beam especially when the beam is small compared to t...

Страница 47: ...inputs While closing a log file can occur much more easily This hard to start easy to stop philosophy is designed to prevent unintentional filling of a hard drive 2 8 1 File Set To begin the process...

Страница 48: ...record entries After enabling the results click Start to begin collecting and logging results To stop the logging process click Pause Whenever the logging process is stopped no matter by what means th...

Страница 49: ...Similarly if Fail it checked only the failed frames will be logged 2 9 Reports Ribbon Reports consist of user defined printouts or savable PDF files that can be created from the various display windo...

Страница 50: ...operation When Save is clicked a pdf file format can be created This will open a standard Windows Save As dialog Enter a file name and click Save When Print Preview is clicked a temporary PDF file wil...

Страница 51: ...e 51 CHAPTER 3 Displays 3 1 Displays LBP2 has the ability to create a flexible display environment to meet the user s specific needs In this chapter the tools that control the screen layouts will be d...

Страница 52: ...uts employ terminology that may be new to some Windows users This section will provide a graphical glossary of terminology of things both old and new and hopefully useful Note Within the industry ther...

Страница 53: ...e This stacked layout is one type of display option but one that affords a limited view of each window Note The Start Page tab is a permanent primary dock site object that cannot be removed To undock...

Страница 54: ...button click on and drag the 3D Beam Display tab and drag it into the bottom of the Results window The docking handles will appear as in the image below Docking Handles All display windows can be drag...

Страница 55: ...ow docking scheme to operate correctly there must always be something in the Primary Dock window This makes manipulating the other windows much easier as each child window s docking handles remain mor...

Страница 56: ...ppears in their window A floating window can be re docked into the main application by dragging its title bar back into the main display window and dropping on a dock handle Below is an example of thr...

Страница 57: ...ned tabs will cause the collapsed item to pop out from the edge for viewing as shown below Clicking on it a second time will re collapse the window This feature allows for better use of available desk...

Страница 58: ...rate Smear Correction This indicator changes color based on the current status of Smear Correction processing The meanings are Grey Smear Correction disabled Green Smear Correction enabled and active...

Страница 59: ...buffer either edit the frame number or run the slider to the desired location The letter edit control allows the user to view special frame buffer locations When indicating a B the display is followin...

Страница 60: ...dialog box directed at the folder where the setup files are saved Select the file to be loaded and click OK Note that the default folder will always be the last folder used 2 Save Setup As Will open...

Страница 61: ...cted at the folder where the data files are saved Specify which frames in the data file to load by entering the Load from File Start frame and frame Count and where in the Write to Buffer Start to beg...

Страница 62: ...s Pixel data is stored in the HDF5 file at folder node 1 DATA All pixel data is in an S32 bit signed binary fixed point format that is described below Data is stored in packed 32 bit words loaded left...

Страница 63: ...ewer that is accessing the string that describes the native format of the data in the file The string see below is found in a folder on node 1 RAWFRAME BITENCODING and is described as L16_12 This mean...

Страница 64: ...you will not be able to recover the original raw camera data 4 4 3 Calibrated Data Conversion LBP2 always stores pixel data in the above S32 signed binary fixed point format If the frame were saved as...

Страница 65: ...culated using the minimum and maximum values of a signed 32 bit integer namely 2 147 483 647 The original per pixel values of the collected data can be obtained by multiplying the floating point value...

Страница 66: ...uide Document No 50306 001 Rev G 3 12 2020 Page 66 5 Click and expand BG_DATA 6 Click and expand the desired frame number 7 Right Click on DATA select Open 8 Select Table Export Data to Binary File Na...

Страница 67: ...ach enabled computed result item These file types can be imported into MS Excel and other third party applications The first row entry in a log file is a header describing the results items posted in...

Страница 68: ...shown above Below is an example of the File Access window The files listed on the right are a list of the last saved or opened setup files To perform a quick reload from the list click once on the des...

Страница 69: ...image exactly like the one currently being displayed The ASCII file type is an actual copy of the image s processed data minus any graphical overlays Thus this type of image will faithfully reproduce...

Страница 70: ...manual aperture will also limit the area where data gets analyzed not just the region copied into an ASCII image file Use the manual aperture with this in mind Hint In order to keep the ASCII export...

Страница 71: ...techniques Ultracal employs a sophisticated proprietary algorithm that yields greatly improved accuracy over various operating conditions and signal dynamic range In addition it can quickly be rerun i...

Страница 72: ...l to restore some of the loss Important Increasing gain also increases noise so use it sparingly To isolate the laser beam profile from unwanted background effects LBP2 has both Manual Aperture and an...

Страница 73: ...entries apply to these results items Only those pixel values that exceed the clip level are used in computing the following results Certain Beam Width methods that have programmable clip levels such...

Страница 74: ...ght of various energy displays i e W J mw cm etc When using a Manual Aperture without an Auto Aperture the Total Power Energy is the amount of power energy inside the Manual Aperture When using an Aut...

Страница 75: ...easure the size of a laser beam LBP2 is designed to provide a set of measurement tools that will allow the user to make this measurement as they see fit The ISO standards have created a consensus rega...

Страница 76: ...M D4 Y m D4 Second moment method ISO 11145 ISO 11146 1 and ISO 11146 3 From laser beam propagation theory the Second Moment or 4 Sigma beam width definition is found to be of fundamental significance...

Страница 77: ...the beam inside a Manual or Auto Aperture The aperture must be approximately 2x the size of the beam The Auto Aperture feature will automatically provide such an aperture under most operating conditi...

Страница 78: ...omputed beam widths will be aligned with a pair of simulated knife edges cutting one in each of the X and Y directions Hence the displayed beam widths will be indicated in the results window as X and...

Страница 79: ...el pitch or the pixel pitch adjusted by the orientation angle The default clip level is 13 5 which will yield an accurate second moment beam width for a TEM00 beam The Diameter percent of total is der...

Страница 80: ...ery accurate 5 10 Rotated Beams Orientation Ellipticity Eccentricity LBP2 can compute and display the Orientation Ellipticity and Eccentricity of beams rotated with respect to the normal X and Y axis...

Страница 81: ...Gamma field in the Camera dialog box Each pixel of each new frame of data will be automatically corrected as defined in the equation shown below An entry of 1 0 disables gamma correction P P Z z g 1...

Страница 82: ...convolution is to think of it is a weighted summation process Each pixel in an image becomes the center element in a neighborhood of pixels A similarly dimensioned convolution kernel multiplies each p...

Страница 83: ...LBP2 User Guide Document No 50306 001 Rev G 3 12 2020 Page 83 The tables below give the convolution coefficients K values for some of the included low pass spatial filters...

Страница 84: ...ailed installation upgrade of the software Uninstall all LBP2 products and install the latest version Error Message Data Source Unavailable If received when selecting a data source LBP2 was unable to...

Страница 85: ...he computer Verify that the device is recognized in Windows Device Manager A powered USB 2 0 high speed port and cable may not be in use Ensure camera is connected to a USB 2 0 high speed port power s...

Страница 86: ...unt such as 90 to mean 90 a measurement based on second moment definitions k a measurement based on a Knife Edge measurement usually a 10 90 percent of energy2 1 The ISO procedures typically refer to...

Страница 87: ...y 3 w beam radius x 3 4 1 3 4 2 Half a beam diameter See above 4 d x d y dx k dy k dx u dy u beam widths second moment knife edge smallest aperture x 1 x 3 5 2 3 5 1 3 2 3 2 4 Second moment knife edge...

Страница 88: ...nergy of a beam divided by its cross sectional area 11 Q Q z pulse energy x x 3 21 3 1 4 9 2 2 Energy in one pulse at location z Joules dxdy z y x H z Q 12 H x y H x y z energy density x x 3 22 3 1 2...

Страница 89: ...ficiency x 3 52 Ratio of the energy of a single laser photon to the energy of a single pumping photon 22 zR zRx zRy Rayleigh length x 3 53 Distance from the waist where the beam is 2 times larger than...

Страница 90: ...length of the focusing optic 28 ax ay transverse displacement x 3 4 Distance of transverse dis placement of the beam in the x and y directions 29 azimuth angle3 x 4 2 8 1c The angle that the major axi...

Страница 91: ...hold power energy density x 3 1 7 A fraction of the max power energy density at location z for CW beams max z E z E for pulsed beams max z H z H where 1 0 36 P z Q z effective power energy x 3 2 1 Eva...

Страница 92: ...nsity of the distribution at location z defined as the weighted mean effective average power i A P z E effective average energy i A Q z H 42 F z flatness factor x 3 2 9 Ratio of the effective average...

Страница 93: ...rence between effective irradiation areas of 10 and 90 of total and power energy density values of 10 of peak edge steepness 1 0 9 0 1 0 z A z A z A z s i i i Note 0 s z 1 s z 0 as the edges of the di...

Страница 94: ...P P f ij ij max Note 1 0 G as 0 G the quality of the fit becomes better 48 dx dy grid spacing 2 3 1 Partition of detector area into orthogonal grid of apertures 49 Aij area of sub aperture 2 3 2 Area...

Страница 95: ...ead function for square pinholes x H ij d L for round pinholes p H ij d L 22 1 54 max angular dynamic range 2 3 7 Maximum usable angular range of the Hartmann sensors 55 ws rms wavefront statistical u...

Страница 96: ...8mm x 44mm x 20 2mm 48mm x 44mm x 20 2mm 29mm x 29mm x 29 5mm CCD Recess 4 5mm 4 5mm 4 5mm Image Quality at 1064nm Pulsed with trigger sync excellent Pulsed with video trigger good CW good Operation M...

Страница 97: ...LBP2 User Guide Document No 50306 001 Rev G 3 12 2020 Page 97 LBP2 VIS2 IR2 Series Camera LBP2 VIS3 Series Camera...

Страница 98: ...h all filters installed for 100ns pulse width 4 Dimensions 48mm x 44mm x 20 2mm 48mm x 44mm x 20 2mm CCD Recess 4 5mm 4 5mm Image Quality at 1064nm Pulsed with trigger sync excellent Pulsed with video...

Страница 99: ...trigger sync excellent Pulsed with video trigger good CW poor Pulse with trigger sync excellent Pulsed with video trigger good CW good Operation mode Software supported PC interface Notes Specificati...

Страница 100: ...LBP2 User Guide Document No 50306 001 Rev G 3 12 2020 Page 100 LBP2 Series Camera w three ND filters...

Страница 101: ...system requirements Notes Specification Supports both Trigger In and Strobe Out Consult Factory LBP2 Series 7mW cm at 1550nm 50 W cm 50W cm 0 1J cm with all filters installed for 100ns pulse width In...

Страница 102: ...gy 36 Display Terminology 52 Dock Handles 53 Dropped Frame 58 Eccentricity 80 81 Edit Pass Fail 43 Elliptical Beam 80 Ellipticity 80 81 Encircled Power Methods 80 epss method 80 Exposure 24 File Acces...

Страница 103: ...nergy 35 Programmable Knife Edge 35 Reports 49 Results display 39 Results Options 42 Ribbon Bar 18 Ribbon Tab 18 ROI 24 Safety 10 Save Data 60 Save Setup 60 Separate Pages 49 Setup files 60 Source 21...

Результаты поиска

Содержание LBP2 Series

Отзывы:

Похожие инструкции для LBP2 Series

Бренды по названию

Популярные бренды

Newport LBP2 Series, Руководство пользователя

Результаты поиска

Содержание LBP2 Series

Отзывы:

Похожие инструкции для LBP2 Series

Бренды по названию

Популярные бренды