YNI Contributions





This feature lists for each surface the paraxial YNI value, which is proportional to the Narcissus contribution of that surface.



Wavelength The wavelength number to use for the calculation.

Discussion In sequential mode, the YNI Contributions analysis and YNIP operand give first-order approximations to the Narcissus contribution of the surface.

The YNI contribution of each surface is the product of the paraxial marginal ray height times the index times the angle of incidence at the surface defined by Surf at the wavelength defined by Wave. This quantity is related to the Narcissus contribution of the specified surface.

The following equation shows the cold return for on-axis image for a single surface in the system. The Narcissus intensity is proportional to the summation of cold return of all refractive surfaces. Therefore, to reduce the Narcissus intensity, the YNI needs to be as large as possible.

C = ϵ M π ( 4 y n i f # ) 2 MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 qacaWGdbGaeyypa0ZaaSaaa8aabaWefv3ySLgznfgDOfdaryqr1ngB PrginfgDObYtUvgaiuaapeGae8x9diVaamytaaWdaeaapeGaeqiWda NaaiikaiaaisdacaWG5bGaamOBaiaadMgacaWGMbGaai4iaiaacMca paWaaWbaaSqabeaapeGaaGOmaaaaaaaaaa@4E47@

For a more detailed discussion, see "Narcissus: reflections on retroreflections in thermal imaging systems," Applied Optics, Vol. 21, No. 18, p3393 (1982).

Next: