BSA Flow Software Installation and User's Guide - CSI

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7.4 Configuring the PDA receiving and transmitting optics 7.4.1 Setting the polarization As already mentioned, a phase Doppler system should be set up such that the relationship between phase difference and particle diameter is linear. In general, this is obtained by choosing a scattering angle where one single mode of scattering dominates the scattered light received by the receiving optics, and where the signal-to-noise ratio is as high as possible. The scattering mode varies with scattering angle and with orientation of polarization. Scattering plane In phase Doppler anemometry the orientation of the polarization of the laser beams is in general referred to the plane of scattering. The plane containing the optical axis of the transmitter probe and the optical axis of the receiver probe is defined as the scattering plane. Parallel Parallel polarization means that the polarization orientation of the transmitting polarization beams (the direction of oscillation of the electric field vector) is parallel to the plane containing the transmitter and receiver probes (scattering plane). Perpendicular Perpendicular polarization means that the polarization orientation of the polarization transmitting beams (the direction of oscillation of the electric field vector) is perpendicular to the plane containing the transmitter and receiver probes (scattering plane). The orientation of polarization used in a PDA configuration is solely determined by the polarization orientation of the transmitting laser beams. Dantec’s 60X series FiberFlow transmitter probes are by default delivered with parallel polarization setting. This is the most commonly used polarization setting for the majority of PDA applications. Changing If you want to change the polarization, turn the polarization ring of the fiber polarization plugs by 90° and re-optimize the fiber manipulators for maximum coupling efficiency. The polarization ring of the fiber plug carries the push-rod that activates the transmitter’s automatic safety shutter. The ring is fixed by a small screw. 7-72 BSA Flow Software: Reference guide
Polarization ring Fixing screw Push rod Fiber manipulator Figure 7-54. The fibre plug has a push rod that activates the transmitters automatic safety shutter to allow laser light to pass. The polarization ring, which holds the push rod, has to be rotated to change the polarization state. 7.4.2 Configuring the PDA receiving optics Front lenses and beam expanders As a general rule, the shorter the focal length, the smaller the particles that can be measured; the longer the focal length, the larger the particles that can be measured. The focal length also corresponds to the working distance. The particle size range measurable by the PDA can be changed in several ways and thus, the PDA probe can be configured to suit the measurement application: • mounting a selection of front lenses and beam expanders • using different aperture plates Front lenses The PDA probes can be fitted with standard front lenses from the 60X FiberFlow optics and, using the 60X117 Conical Adapter which is supplied with every PDA probe, front lenses from the 50X optics series (see Table 7- 1). To facilitate alignment of the PDA receiving probe, Table 7-1 also contains the focal distances of the different lenses. The distance between the front side of the lens (at the center point of the lens) and the focal point (which should coincide with the measurement volume) is called the focal distance and can easily be measured using a ruler. Caution When using a ruler to check the focal distance, be careful not to scratch the lens. Type no. Focal length Focal distance Notes mm mm 60X70 160 155 50X57 310 300 Requires adapter 60X117 BSA Flow Software:Reference guide 7-73
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BSA Flow Software Version 4.10 Inst
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1. General 1.1 Table of Contents 1.
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5.5 Optical Calibrated LDA System p
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7.2.1 Basic principles of phase Dop
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1.2 Dantec Dynamics Licence Agreeme
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1.3 Laser safety All equipment usin
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2. Introduction Congratulations wit
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2.1.9 Analog Monitor Option 2.1.10
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2.3.4 Trouble shooting 2.3.5 On-lin
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3. Installation 3.1 General 3.1.1 P
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Directory structure CPU usage will
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3.2.2 Installation as administrator
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You have the possibility to define
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Click Next and select the add-ons y
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Peer-to-peer connection Processor s
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Click on the Download tab to get th
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The BSA processor will restart. Thi
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• If the Game controller needs to
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Figure 3-2 National Instruments Mea
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3.7 Third party traverse system To
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4. The user interface 4.1 Layout Me
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4. If the mouse pointer was in the
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4.3 Project explorer shortcuts to t
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Figure 4-5 Dialog for adding object
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Using Templates To make a Template,
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4.6 The tool bar Figure 4-6 the pro
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Save As... Figure 4-10 the File men
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Figure 4-11 Save As compressed proj
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Figure 4-14 the Properties - Summar
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Figure 4-18 The Select Position dia
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Options With the Options you get a
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When Enable error logging is checke
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The fourth format, Significant Digi
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The PDA Optical Configuration objec
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4.7.7 Help menu Figure 4-34 The Hel
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4.9 Message window • by clicking
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PM and Bragg cell connections Warni
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LDA and PDA transmitting optics The
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Click on OK. Note For fully opaque
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In the third step, the software con
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Lightweight Traverse with handbox C
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57G15 Traverse interface Third part
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• right-click the Traverse Server
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4. This brings up the following dia
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To change a setting, click in the V
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Figure 4-39 System monitor in auto-
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14. You have now completed data acq
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4. Check the Show System Monitor wh
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. 8. LDA 1 properties are specific
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11. To monitor the Doppler signals,
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The axes will automatically rescale
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Click Acquire. If a complete new re
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Define the positions that you want
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Select the type of the files to ope
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5. Project explorer objects 5.1 Sta
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Browse to the file you wish to impo
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For each column, the data type must
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5.3.1 Output properties Figure 5-4
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Figure 5-7 The Custom… dialog und
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Figure 5-8 BSA F/P 30: processor pr
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Max. acquisition time: The maximum
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Normal user interface Advanced user
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Figure 5-11 The Bragg cell connecto
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LDA 1, 2, . properties: Range and g
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5.3.4 System monitor It frequently
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Scope: Burst spectrum display Recor
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Overlaid Graphs: used to show the b
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Uncheck the Use default bindings bo
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The calibration data are stored in
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5.6.1 PDA beam system The Beam syst
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Figure 5-24: Fringe direction setti
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5.6.4 Medium properties Medium name
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Software max. limit in mm.: Self ex
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The default address of the National
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Traverse coordinates of a datum poi
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5.7.8 Traverse Mesh generator If yo
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Regions Figure 5-39 Motion pattern,
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Warning Please observe strict secur
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5.9 Export Figure 5-40 Data-sources
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If multiple positions are exported
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5.9.3 Selected columns 5.9.4 Binary
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Data C Headers Programming Examples
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char filename[256] = {0}; strcpy(fi
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Range means that the filter will ap
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5.11.1 Data Properties Note that th
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Figure 5-54. Size histogram (left)
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Figure 5-57. Velocity distribution
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Figure 5-58 list output of 1D PDA d
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The next selection in the context m
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5.13.2 Objects under Merge object A
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N−1 Mean u ∑ ηiui = i= 0 N−1
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Cross-moments The property Cross-mo
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The calculation of ε fails if Umea
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Figure 5-71 General properties of t
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An alternative geometry of a 3D LDA
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Figure 5-75: FiberPDA phase plot. A
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5.16.3 Display properties The defau
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The output quantities of the diamet
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6. Options and Add-ons This chapter
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6.1 Advanced Graphics Add-on The ma
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Figure 6-2 The Tools-Options-Output
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Figure 6-5 Scale properties for 2D
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Property group ‘Display’ Also t
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6.1.3 2D Plot [m/s] 36 34 32 The 2D
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6.1.4 2D Histogram For off-line use
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Configuring the 2D Histogram The co
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Configuring the 3D Plot Figure 6-21
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Figure 6-23 “Interpolate bin” s
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Property group ‘Data’ Figure 6-
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Coordinate shown on Intercepts the
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LDA1-Mean [m/ s] -2,00 -3,00 -4,00
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Figure 6-32 Properties of the Vecto
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Figure 6-33 shows a velocity vector
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6.1.9 Exporting plots Copying a plo
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6.2 Synchronisation Option 6.2.1 In
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Pin Signal Pin Signal 1 Out 1 14 Gr
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6.2.5 Sync. Output Signals properti
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Outputs Figure 6-40 Differential sy
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Figure 6-42 Cyclic phenomena in the
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Cycle length The property Cycle len
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It allows to define the number of b
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Note It is not possible to have 0 a
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Figure 6-47: Output data from the c
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performed prior to phase sorting yo
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Figure 6-51 Properties of the spect
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Blocking Using the FFT-approach to
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1,2 1,0 0,8 0,6 0,4 0,2 Weight fact
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Output from the Spectrum object The
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6.4.2 Advanced Spectrum object Load
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To evaluate the new algorithm, comp
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6.4.3 Correlation object Conclusion
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20 16 12 8 4 0 0.0 0.2 0.4 0.6 0.8
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Time The first column of the output
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The Protocol Figure 6-67: Generic t
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How to Use the Initialisation Strin
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Figure 6-69: Traverse File option i
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Properties Output from MATLAB engin
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Result window Script Hides and disp
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6.6.2 Calculation object from to
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Tip To combine calculated data and
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max var. max of all arguments sum v
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6.7.3 Software set-up Once A/D-hard
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Figure 6-76 BSA F/P application win
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6.7.7 Analog input specifications J
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6.8.1 Installation 6.8.2 Hardware c
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Figure 6-85 BSA F/P application win
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6.9.1 Required hardware 6.9.2 Calib
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2. Select Parameter Input 3. The fo
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B. Select Advanced Curve fitting an
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6.10 Mobile system Monitor option T
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7. Reference guide 7.1 Theory of La
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Doppler effect d0 R(z) Figure 7-1 L
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es e2 e1 U Figure 7-3 Scattering of
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Measuring volume proportional to pa
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Laser fI Beam splitter As indicated
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7.1.6 Frequency shift • Reduce th
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As long as the particle velocity do
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7.1.7 Signals The primary result of
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7.1.8 Seeding Seeding as flow field
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150 90 180 0 180 0 180 0 210 120 24
Page 321 and 322: 7.2 Theory of Phase Doppler Anemome
Page 323 and 324: D is the particle diameter. βi is
Page 325 and 326: For reflection (Equation 7-16) The
Page 327 and 328: Figure 7-21: The effect of changing
Page 329 and 330: This is the principle of the spheri
Page 331 and 332: The trajectory effect The slit effe
Page 333 and 334: Figure 7-28:The DualPDA as a combin
Page 335 and 336: Figure 7-31: Reflection and refract
Page 337 and 338: Characteristic scattering angles At
Page 339 and 340: ⎛ ϕ ⎞ ϕ2 = 4arcsin⎜ ⎟ −
Page 341 and 342: Figure 7-36: The critical angle con
Page 343 and 344: Using side scatter (reflected light
Page 345 and 346: Mask Front Lens Eye-piece Spatial f
Page 347 and 348: Alignment of the eyepiece The focus
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Page 351 and 352: For both orientations of polarizati
Page 353 and 354: Figure 7-46. The effect of changing
Page 355 and 356: Table of characteristic angles Defi
Page 357 and 358: n rel ϕ c1 ϕ b0 ϕ c2 ϕ b2 ϕ r2
Page 365 and 366: Choice of wavelength Choice of mask
Page 367 and 368: Choice of wavelength and focal leng
Page 369 and 370: Choice of polarization Choice of sc
Page 371: Focal length Transmitter (FiberFlow
Page 375 and 376: Aperture plates The particle size r
Page 377 and 378: Tighten the cable securely at each
Page 379 and 380: Disconnect the receiving fiber V1 f
Page 381 and 382: Step by step procedure Phase-Dopple
Page 383 and 384: Lower half: The lower half of the b
Page 385 and 386: Recommended acceptance angles of th
Page 387 and 388: 7.7.4 Air bubble in freon Character
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Page 391 and 392: 7.7.8 Glass sphere in water Charact
Page 393 and 394: 7.7.10 Latex sphere in water Charac
Page 395 and 396: Blocking increases calculation spee
Page 397 and 398: In this particular example we get:
Page 399 and 400: 7.9 Moments (one-time statistics) 7
Page 401 and 402: 1 = N Mean D mean ui (7-31) N ∑
Page 403 and 404: Software implementation Updating me
Page 405 and 406: u v 2 2 = = ∑ ∑ tU tV 2 2 − 2
Page 407 and 408: (histogram properties). ni is the n
Page 409 and 410: volume is calculated for the class
Page 411 and 412: D30 The volume mean diameter is cal
Page 413 and 414: Three further factors are however i
Page 415 and 416: d e ln 2 max 2 V do ∗ Vt = ( 7-48
Page 417 and 418: Diameter bins The number of diamete
Page 419 and 420: Trajectory dependent detection area
Page 421 and 422: Corrected particle Max d e ( Di ) C
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Integral time-scale τI Definition
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The mean values of u(t) and v(t) ar
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Low pass filtering & Step noise Obv
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fc ≡ t 1 2 ∆ If the true signal
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Estimator bias Estimator variance S
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-again S’(f) is used to distingui
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Zero padding Often the sampling per
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As an example the Hanning window is
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The Explorer window will now look s
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8.2.2 Peer-to-Peer Configuration Co
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. High Voltage or Figure 8-3: Calib
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Invalid particles in the corners Th
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Gaussain beam effect The following
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To check for connection, right-clic
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