That analysis uses a probing source ray and records where that probing source ray hits the NSC object. For details, see the article entitled " NSC Sag Map User Analysis". The NSC Sag analysis, which is a ZOS-API extension, measures the sag of a CAD part. The converter can be found under Optimize.Convert Asphere Type.Ĭonvert the windshield into a Grid Sag Surface: This way the system stays in pure sequential mode, and OpticStudio can convert the Grid Sag Surface into Asphere Type surfaces. This makes ray aiming more difficult and could cause other ray trace issues as well.Ī workaround is to measure the sag of the CAD part and then model it using a sequential Grid Sag Surface. This works well when modelling the system in the backward direction, from Virtual image to display, but will become problematic when working in the forward direction as the STOP surface is now located after the Non-sequential Component surface. If it is described as a NSC CAD part inserted into a sequential system, then the system becomes mixed mode. The windshield can be described by any sequential surfaces, like freeform surfaces, or a Non-sequential CAD part. It displays the footprint of the beam superimposed on the windshield surface: To find that “active” area, the Footprint Diagram tool can be used (found under Analyze.Rays & Spots.Footprint Diagram). The whole windshield can be modelled, or only the area of the windshield used by the HUD can be modelled. Wavelengths: The LCD display will emit at one wavelength = 0.55µm.Therefore, the object size should be 6 times of this:įield Width = ± 75mm (6 x 12.5) and Field Height = ± 30mm (6 x 5) The LCD Display dimensions are: Width = ± 12.5mm and Height = ± 5mm. Because the current design is backward, from virtual image to the LCD display, the size of the virtual image can be computed and used as the object height to define field size in the Field Data Editor. In the actual system, the image on the LDC display is magnified by a factor of 6 to form the virtual image. Fields: The Field Type is set as Object Height and the Normalization is defined as Rectangular.The Entrance Pupil Diameter (EPD) is then computed as 2 x (sqrt (20^2+50^2)) = 108 mm. Because it represents the range of positions taken by the driver’s eyes: Width = ± 50mm and Height = ± 20mm, a rectangular aperture of this size is attached to the STOP surface. Aperture: The Eyebox is the system STOP.The windshield is described as an Extended Polynomial Surface. It contains a freeform model of the whole windshield. The file name is “ HUD_Step1_StartingPoint.zar” and may be downloaded at the top of the article. Step 1: From Virtual Image to Display (Backward) Starting pointįor convenience, a template has been built that contains all the starting elements in place. It will display the true image driver sees using the HUD. This provides a more realistic model where users can include stray light analysis. Finally, the system will be converted to Non-Sequential (NSC) Mode.This allows to evaluate the “true” performance from the display to the virtual image, that is in the forward direction.
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