A good optical design would considered a parasite reflections and a scattered light. Most optical soft are intended for optimizing the main light flow passing the optical system, but there are special modes to study secondary reflections and scattering. However it is more difficult level as...
Exactly,
if you know or can assume the spectral distribution of the source and definite spectral range, you can calculate converging coefficient as (∫Φ(λ) V(λ) dλ)/(∫Φ(λ) dλ) within defined spectral range, that would be [Lumens/W]. That coefficient can be used for conversion back and forward.
I am not sure about what is doing the HWP (=Half Wave Plate), but after passing the first PBS (=Polarizing Beam Splitter) the light is splitting into two ortogonal linear polarisations going different ways.
The combination of PBS+QWP+Mirror2 is showed on the illustration - linearly polarised...
Thanks. It is quite clear how it works.
Question: What is about interferogram imagine condition? I assume that CCD camera has no lens and micro objectives are with infinity conjugation? Right?
Or, in case if you imaging the interferogram what would be conjugation points?
Looking on you image I...
Yes, but use of slit relaxes demands for the imagine optics.
If a sample has some finite depth, the image would do the same, even if it would be moved to "infinity ".
Demands about imagine optics depens upon if you want to preserve and resolve its spatial structure or you prefer homogenise...
That is not a necessary demand.
If resolution approaching diffraction limit, the slit width should be reduced accordingly and that would filter out phase aberrations.
If resolution defined by detector's pixel pitch, the slit width would be optimally twice the pixel pitch and again, the phase...
Right, presumably you need a sort of relay optics to reimage illuminated sample spot onto spectrometer slit, aiming that the light cone would exceed the acceptance numerical aperture of the spectrometer.
Yes, of cause, the feeding optics should fit the light within the acceptance etendue of spectrometer. That means you should aim 1) even spatial illumination within the entrance slit and 2) even angular illumination within the numerical aperture (the latest to obtain even illumination across...
In Czerny-Turner spectrometer one wavelength in a middle of spectral range can be balanced for coma aberration. Coma would change the sign at balanced wavelength passing zero value. I would not struggle with astigmatism, just adding a defocus it is possible to get one of astigmatism focies...
First I was looking the upwind case only. But I have checked the downwind case as well and my conclusion is still keep holding.
In the case of the optimal vane orientation (meant bisecting the direction of motion and the apparent wind in the frame of carriage) the out flow from control volume...
One question, may be I missed before. Do you have control volume stationary at ground frame or it is moving with the carriage? If it is moving, the pipe sticking out moving volume would not blow the flow in direction of the pipe pointing.
With the optimal vane orientation (bisecting apparent wind angle in the moving frame), the deflected wind is moving in opposite direction to the boat speed (parallel to the boat speed, but in opposite direction). The air leaving the control volume in direction opposite to the boat speed...
That is quite obvious in your model. First surface has a spherical aberration exactly matching with opposite sign the spherical aberration of the second surface.
Imagine raytracing refraction on the first surface gives your rays caustic. Now imagine backwards tracing of second surface...
That is about consideration what should be counted for "Signal". In the most cases that would be incoming photons, but can be only a portion of photons, when using additional signal discrimination, like polarization, spatial, spectral or other variation in the signal.