Source to Camera Distance for Diverging Beams
Contents
1. Left click on the Clip a box at top left on the screen Enter the D d value in the Clip level entry dialog box as Source to slits distance in mm 8 Select Enable Angular Divergence and select a Full angle unit Click OK The measured profile is corrected internally for cos effects per the checked Angular Divergence Options before the value for the selected clip level is calculated 9 Press Go and the beam divergence will be measured and displayed Problems Reread this Application Note Still no luck Save a file per the instructions in the User Manual and email it with a description of your problem to support dataray com D d D 2WD d 2WD Full angle2. Divergence_Distance_Measurement_AppNote docx Page 1 of 1 For contacts visit www dataray com Rev 0808a DataRay Inc Boulder Creek CA USA DataRay Inc Application Note Beam Profiling Engineered as a system Delivered as a Solution Source to Measurement Plane Distance Determination for Divergence Measurement Applies to All DataRay beam diameter measurement slit scanner and camera products Software Ver 6 00S4s or higher running under Windows XP with SP2 or Windows Vista You are trying to measure A large beam divergence by measuring the beam diameter at a fixed distance from the source You do not know The exact distance from source to measurement plane 1 Learn to use the measurement instrument 2 Set the instrument at a distance from the source such that the beam diameter is within its measurement capability The profile should be constant and with wings which go to zero See example below 3 Set Average to Average 20 Measure the FWHM beam diameter 2Wub 50 Note this FWHM value as 2WD at unknown distance D 4 Using an accurate z stage preferably with a digital micrometer move the source towards the instrument or vice versa by a small defined distance d where d is around 10 to 20 of D Note the new FWHM diameter 2WD d 5 Calculate the unknown z position D from the known values as D 2WD d 2WD 2WD d 6 Calculate the current position of the measurement plane D d 7
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