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27 September 2021 at 11:41 #6575LaserJonParticipant
[reposting here as I accidentally had posted this in the Klayout forum]
Hi,
I am having some trouble with the Euler bend. The expected length, the bend’s property length_geo, and the length on the mask only match for a 90 degree bend, and otherwise they are all different. I’m using the current Nazca version. Can you advise please?
Sample Code:
import nazca as nd import numpy as np nd.clear_layers() nd.add_layer(name='rib', layer=(10,0), fab_name='example', accuracy=0.001) with nd.Cell(name='top_cell') as top_cell: #https://en.wikipedia.org/wiki/Euler_spiral #expected path length: L = 2 * Radius * Angle(rad) y=0 #The third value in tuples below are approximate lengths I measured from the mask. for radius,angle,masklength in [(12.5,180,55),(12.5,90,39),(50,90,156),(50,8,47),(50,4,33),(50,2,23.4),(50,1,16.6),(25,1,8.3),(12.5,1,4.1),]: euler1=nd.euler(width1=1,width2=1,radius=radius,angle=angle,layer='rib').put(0,y,0) print('Radius/Angle: ({:.1f}/{}) Expected length: {:.2f}, length_geo: {:.2f}, mask measured length: {}'.format(radius,angle,2*radius*angle*np.pi/180, euler1.length_geo,masklength)) y=5 nd.export_gds(topcells=top_cell,filename='example_081321.gds')
Output:
Rad/Angle: (12.5/180) Expected length: 78.54, length_geo: 27.77, mask measured length: 55
Rad/Angle: (12.5/90) Expected length: 39.27, length_geo: 39.27, mask measured length: 39
Rad/Angle: (50.0/90) Expected length: 157.08, length_geo: 157.08, mask measured length: 156
Rad/Angle: (50.0/8) Expected length: 13.96, length_geo: 526.86, mask measured length: 47
Rad/Angle: (50.0/4) Expected length: 6.98, length_geo: 745.09, mask measured length: 33
Rad/Angle: (50.0/2) Expected length: 3.49, length_geo: 1053.72, mask measured length: 23.4
Rad/Angle: (50.0/1) Expected length: 1.75, length_geo: 1490.19, mask measured length: 16.6
Rad/Angle: (25.0/1) Expected length: 0.87, length_geo: 745.09, mask measured length: 8.3
Rad/Angle: (12.5/1) Expected length: 0.44, length_geo: 372.55, mask measured length: 4.1Thanks, Jon

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