We all know that there are forward tracing and reverse tracing in LightTools, where forward tracing belongs to global analysis (that is, to view the overall simulation results of the system), while reverse tracing belongs to local analysis (ie, you can view some of the receivers). A point or a region to simulate the results). If we want to analyze the specific energy distribution of a certain area on the target receiver, then reverse tracing is a good simulation method, but if we want to see how the energy distribution in this area is formed (ie, the formed optical path) What is it?)
At this time, it is more troublesome to use reverse trace to view, because the light displayed by the reverse trace is randomly generated. If you want to see the light path that produces the energy of the area, then you need to make the reverse trace. Displaying a lot of light shows that it is not always clear (because too much light may interfere with the line of sight). To solve this problem, LightTools 8.1 has added a new local analysis feature, which provides a simple and fast way to help us analyze such problems. So let's learn how to use this feature in this newsletter.
At this time, it is more troublesome to use reverse trace to view, because the light displayed by the reverse trace is randomly generated. If you want to see the light path that produces the energy of the area, then you need to make the reverse trace. Displaying a lot of light shows that it is not always clear (because too much light may interfere with the line of sight). To solve this problem, LightTools 8.1 has added a new local analysis feature, which provides a simple and fast way to help us analyze such problems. So let's learn how to use this feature in this newsletter.
As shown in the figure below, our example is relatively simple, using an LED light source and a receiver. The specific structure of the LED light source is composed of an LED chip , a reflective bowl, an electrode line, and an outer lens. After the simulation is completed, the overall illuminance energy distribution of the LED can be seen on the receiver.
Figure 1: LED model
To view the illuminance energy distribution results, select Analysis>Illuminance Display>LumViewer from the menu bar. Then we can clearly see that there is a recessed area directly below the energy ring. How is this recessed area formed? How do we find out why it is formed? At this point we can use the local analysis function to check the cause of the formation of the recessed area.
Figure 2: Illumination simulation
Select Ray Trace > Simulation Input > Data Collection in the menu bar and click on the Collect Region Analysis Data option at positive forward receiver_32. Then enter the number of simulated rays into 2,000,000 rays in the Forward dialog box, and finally click to start the forward tracking.
Figure 3: Analog Input
After setting the analog input, we will open the illumination simulation diagram (Analysis>Illuminance Display>LumViewer), click the Region button in the menu bar above the graph, and then select the recessed area in the illumination simulation map (currently, the local analysis function can only select the rectangle. area). After setting, we return to the 3D view window and select Show o nly Region Analysis Rays from the Show ray drop-down menu so that only the light path associated with the recessed area (ie the cause of the dent) is displayed in the 3D view window.
Figure 4: Setting the viewing area
Figure 5: Display Settings
According to the displayed path, we can clearly see the reason why the recessed area is generated after amplifying the LED light-emitting area, that is, the electrode line blocks a part of the light (the electrode line absorbs or reflects a part of the light), and finally causes the energy recession phenomenon in the area. After finding out the cause, if you want to see how much energy there is in the area, you can open the illuminance mesh properties dialog and view the detailed simulation parameters in the Region Results window. These simulation results depend on the local part you selected. Area size and position, of course, you can also set the specific location and size of the local area in the Region window (we previously described it manually on the illumination simulation).
Figure 6: Detailed path
Figure 7: Specific simulation result parameters
Summary: The local analysis function provides a simple and fast way to help us analyze the energy distribution problem in a region of the receiver, and can display the specific path that produces the energy distribution of the region in the 3D view.
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