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BSA Flow Software Installation and User's Guide - CSI

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Uncheck the Use default bindings box to change the bindings.<br />

The Beam System properties refer to the PM input, e.g. Beam System U1<br />

refers to the optics properties of the optics <strong>and</strong> PM connected to PM input 1.<br />

Based on the parameters specified below, the software computes the<br />

measurement volume dimensions <strong>and</strong> the fringe spacing. These can be seen<br />

in the lower part of the <strong>BSA</strong> Application window, when Show - Show<br />

Optics is checked in the context menu (right-click in the lower part of the<br />

window).<br />

Note The software computes the effective beam spacing at the front lens as Beam<br />

Spacing multiplied by Exp<strong>and</strong>er Ratio.<br />

To get correct optical parameters, set the exp<strong>and</strong>er ratio to 1, <strong>and</strong> the beam<br />

spacing to the one at the front lens.<br />

In the Beam diameter field, enter the beam diameter at the front lens, i.e. the<br />

beam diameter before beam exp<strong>and</strong>er(s) multiplied with the total beam<br />

expansion.<br />

Wavelength The wavelength of the laser line used, in nm.<br />

The most common wavelengths used for LDA are:<br />

476.5 nm: “violet” or dark blue line of an Argon-Ion laser<br />

488 nm: blue line of an Argon-Ion laser<br />

514.5 nm: green line of an Argon-Ion laser<br />

532 nm: green line of a frequency doubled Nd:YAG laser<br />

632.8 nm: red line of a Helium-Neon laser<br />

Focal length The focal length of the front lens of the transmitting optics. Used for<br />

calculation of the fringe spacing in <strong>and</strong> dimensions of the measurement<br />

volume.<br />

Beam diameter The diameter of the laser beam at the exit of the optics (before front lens <strong>and</strong><br />

beam exp<strong>and</strong>er). Used for calculation of the dimensions of the measuring<br />

volume.<br />

Exp<strong>and</strong>er ratio It should be set to 1 if no beam exp<strong>and</strong>er is used. The beam diameter is<br />

multiplied by the exp<strong>and</strong>er ratio to find the resulting beam diameter at the<br />

exit of the beam exp<strong>and</strong>er or entry to the front lens. Used for calculation of<br />

the fringe spacing in <strong>and</strong> dimensions of the measurement volume.<br />

<strong>BSA</strong> <strong>Flow</strong> <strong>Software</strong>: Project explorer objects 5-27

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