
Emitter efficiency meritoid
The emitter efficiency meritoid calculates the fraction of rays from an emitter that reach the image plane. This is a purely geometrical calculation, and does not take into account energy losses in the lens due to reflections, scattering, or absorption. An aperture should be placed on the image plane if the finite spatial extent of the fiber is to be included.
This meritoid is an "stochastic meritoid". Random rays are generated by the emitter and traced through the lens system. The fraction of transmitted rays is therefore a fluctuating value. This makes this meritoid unlikely to work with the optimized. But it can be useful with merit plot to study how varying a lens parameter affects the fraction of rays that make it through the system. On the merit plot "term values" option will plot the fraction of rays.
Parameters
- Emitter number
- Identifies which emitter is used.
- Number of rays
- Number of rays generated by the emitter. Using more rays will make the calculation take longer.
- Circle radius
- If this parameter is not zero, then rays are only counted if they land on the image plane within a circle of this radius (units: mm).
- Target
- Desired fraction of rays. Default value is 1, meaning that the meritoid gives a minimum contribution to the merit function when all the rays pass through the system.
- Tolerance
- The tolerance is used to weight the residual in the usual way.