Analysis

Normal Vector

Defines the normal to the plane of the polarization map. Non-planar surfaces will be projected onto a plane for polarization maps. For more information, See “Normal and Up Vectors” on page 5.14.

Up Vector

Defines the up vector to the plane of the polarization map. The up vector defines the “vertical axis” of the displayed map. Non-planar surfaces will be projected onto a plane for polarization map. See “Normal and Up Vectors” on page 5.14.

Apply

Update the map options and display the new polarization map.

Set Defaults

The options are saved when the Model is written to disk in an OML file. After the data is changed, pressing the Set Defaults button with stored the data into the TracePro defaults files to be used the next time TracePro is opened. See “User Defaults” on page 1.9.

Save Polarization Data

Data from a polarization map can be saved to a text file via the File|Save As menu. The data is comprised of a short header and the four values from the Stokes vector at each map cell. Each Stokes vector is contained between a set of parentheses.

The following output shows a portion of the data with four data rows with only one of the data columns visible.

TracePro Release: 3 2 0

Polarization Map Data for

Data for Object 5 Surface 5

Data generated at 11:37:54 March 19, 2004

(0.81661021,-0.14907119,-0.09443592,0.00000000) (......	)
(0.81877151,-0.16808156,-0.04879953,0.00000000) (......	)
(0.81948364,-0.17453937,-0.00000000,0.00000000) (......	)
(0.81877151,-0.16808156,0.04879953,0.00000000) (......	)

OPL/Time-of-flight plot

This command creates a plot of flux incident or absorbed at the selected surface per unit of optical path length (OPL) or time of flight. The OPL is the total optical path along each ray from the source to selected surface. Likewise, the time of flight is the total time it takes for light to propagate along the ray path from the source to the selected surface. The OPL and time of flight in a homogeneous, isotropic material are related to each other by the speed of light,

OPL = ct,

where c is the speed of light in vacuum and t is the time of flight. An example OPL/ time-of-flight plot is shown in Figure 6.26.

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FIGURE 6.26 - OPL/time-of-flight plot.

OPL/Time-of-flight plot options

You can change the OPL/time-of-flight plot using the OPL/time-of-flight Plot Options dialog box, as shown in Figure 6.27. Select Analysis|OPL/Time-of-flight Plot Options, or right-click on the OPL/Time-of-flight plot and select the OPL/ Time-of-flight Options to open the dialog box.

To aid in setting the Min Length and Max Length (or Min Time and Max Time) to values that are meaningful for your model, you can use the Ray History Table on the surface of interest. (See “Ray Histories” on page 6.44.) Look at several rays and notice the value of the OPL at the selected surface (the bottom row in each table) to judge the range of OPL values that are of interest for the current surface.

Some of the settings in the Options dialog are redundant, i.e. they depend on other settings. The length and time entries (Min, Max, and Increment) depend on each other through the relation OPL = ct. For example, if you change the Min Length setting, the Min Time setting will automatically change per this relation. Also, the Max, Increment, and # of Increments settings are interdependent. If you change the # of Increments value, the Max Length and Max Time settings will change. Conversely, when you change the Max Length or Max Time, the # of Increments will automatically change. Finally, when you change the Length Increment or Time Increment, the # of Increments value will change.

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Analysis

FIGURE 6.27 - OPL/time-of-flight plot options dialog box.

Plot Flux Versus

You can plot flux versus OPL or time of flight

Rays to Plot

You can plot absorbed or incident rays

Normalization

You can choose to display the flux unnormalized (raw) or normalized to emitted flux, incident flux, or absorbed flux.

Log Scale

You can display the flux axis with logarithmic spacing of flux values.

Smoothing

You can smooth the curve of flux versus OPL/time-of-flight.

Smoothing factor

The smoothing factor determines how much smoothing occurs when smoothing is selected. The curve will be smoothed with a blur width that is inversely

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proportional to this number. For example, if a factor of 10 is used, the blur width is 1/10 of the length of the horizontal (OPL or time) axis.

Length Units

If Flux versus OPL is selected, this setting determines the units on the horizontal axis of the plot.

Min Length

If Flux versus OPL is selected, this setting determines the minimum value on the horizontal axis of the plot.

Max Length

If Flux versus OPL is selected, this setting determines the maximum value on the horizontal axis of the plot. This setting is affected by the # of Increments setting.

Length increment

If Flux versus OPL is selected, this setting determines the length increment for binning the flux versus optical path length.

# of Increments

The number of OPL or time increments that are used to collect the flux, i.e. the bin size. This setting is affected by the Max Length and Max Time settings.

Time Units

If Flux versus time of flight is selected, this setting determines the units on the horizontal axis of the plot.

Min Time

If Flux versus time of flight is selected, this setting determines the minimum value on the horizontal axis of the plot.

Max Time

If Flux versus time of flight is selected, this setting determines the maximum value on the horizontal axis of the plot. This setting is affected by the # of Increments setting.

Time Increment

If Flux versus time of flight is selected, this setting determines the time increment for binning the flux versus time of flight.

Save OPL/Time-of-flight plot

Data from an OPL/Time-of-flight map can be saved to a text file via the File|Save As menu. The data is comprised of a header and a two-column table with the values of flux versus OPL or time of flight.

The output below shows a portion of the data with four data rows with only one of the data columns visible.

Finally, you can also save plot image as a bitmap. To do this, select File|Save As and choose Files of type: bitmap.

TracePro Release: 5 0 0

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