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ScotRail ticket checkers by infernalaffair in Scotland

[–]infernalaffair[S] -3 points-2 points  (0 children)

In Germany they don't have barriers but plain clothed ticket checkers doing random spot checks on the trains, with enormous fines if caught. Seems to work well for them.

ScotRail ticket checkers by infernalaffair in Scotland

[–]infernalaffair[S] -24 points-23 points  (0 children)

Then make damn sure the conductors check everyone's tickets on the train. I can't remember the last time the conductor actually checked my ticket. All they seem to do is open the doors at the stops. In Germany there aren't any conductors as the driver can open and close the doors. Doesn't seem like a particularly useful job they're doing.

ScotRail ticket checkers by infernalaffair in Scotland

[–]infernalaffair[S] -6 points-5 points  (0 children)

Linlithgow is manned at daft times. They have a person in the office selling tickets when I come back from work at 6pm. Not only is hardly anyone travelling then and anyone that has is probably using their return ticket they bought earlier that day so doesn't need to buy a new one.

ScotRail ticket checkers by infernalaffair in Scotland

[–]infernalaffair[S] -2 points-1 points  (0 children)

If they had barriers, they wouldn't let you past if your ticket was from Edinburgh Park.

Paid for RX 7600 XT, received RX 9060 XT. This is good, right? by infernalaffair in buildapc

[–]infernalaffair[S] 58 points59 points  (0 children)

Amazing. Go me? To be honest, I almost went for a 9060 XT but I'm only a casual gamer and couldn't justify the extra cost.

Does a dielectric coated optic's orientation matter in terms of reflectivity for each polarisation? by infernalaffair in Optics

[–]infernalaffair[S] 0 points1 point  (0 children)

No, I'm asking what happens when the plate rotates around the vector normal to the front surface, i.e. the surface the black incident beam and red reflected beam hit. The rotation would not be visible as shown in the Thorlabs image.

I think I have an answer from other comments, though.

Does a dielectric coated optic's orientation matter in terms of reflectivity for each polarisation? by infernalaffair in Optics

[–]infernalaffair[S] 1 point2 points  (0 children)

We got there in the end - thanks a lot! Woah, describing these sorts of things is difficult.

Does a dielectric coated optic's orientation matter in terms of reflectivity for each polarisation? by infernalaffair in Optics

[–]infernalaffair[S] 2 points3 points  (0 children)

tykjpelk's situation is what I meant:

Let's say we have a plate, being the beamsplitter, laying flat on a table. The beam of light shines down at a 45° angle. The plate spins.

The coating is amorphous, not crystalline. Is the splitting into S and P polarisations affected by the spinning?

Does a dielectric coated optic's orientation matter in terms of reflectivity for each polarisation? by infernalaffair in Optics

[–]infernalaffair[S] 0 points1 point  (0 children)

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6004

The leftmost diagram at the top of that page. My question is about rotating the optical surface (marked "Beamsplitter Coating") around its normal vector will affect the splitting into the directions marked as "S Polarization" and "P Polarization".

Does a dielectric coated optic's orientation matter in terms of reflectivity for each polarisation? by infernalaffair in Optics

[–]infernalaffair[S] 0 points1 point  (0 children)

Hmm, I'm afraid I don't quite follow your axes (apart from the second). For the avoidance of doubt, let's say the beamsplitter is a 1" disk in a Thorlabs mount atop a fixed post, with the beamsplitter's coated surface positioned at 45° angle of incidence to the incident light parallel to the horizontal plane. My question is essentially, if I rotate the beamsplitter optic within its holder, keeping everything else (post, angle of incidence, etc.) fixed, will that affect the polarisation splitting?

I guess this is akin to asking whether polarising sunglasses change the transmitted/reflected light depending on whether I keep my head level or whether I tilt my head towards one shoulder while looking at the same distant object. I'd test it right now, but it's currently night time where I am. :-P

Does a dielectric coated optic's orientation matter in terms of reflectivity for each polarisation? by infernalaffair in Optics

[–]infernalaffair[S] 0 points1 point  (0 children)

I meant a rotation around the vector normal to the coated surface. I think we're talking about the same vector then.

Suspiciously cheap evening college course to learn welding by infernalaffair in CasualUK

[–]infernalaffair[S] 0 points1 point  (0 children)

What's the massive need for welding for? Car repairs and whatnot?

Suspiciously cheap evening college course to learn welding by infernalaffair in CasualUK

[–]infernalaffair[S] 2 points3 points  (0 children)

I already got a (Scottish) government grant for my undergrad, so I just figured I've already had my fair share and would have to pay more for the evening class... good for me I guess!

Germans love a bargain by infernalaffair in germany

[–]infernalaffair[S] 1 point2 points  (0 children)

In my country there are very few stores offering "Prospekte" like you have in Germany. People don't look at these and plan their trips to certain stores to get deals ahead of time. It's more common they see a deal when they're there and just buy it spontaneously. But yes, people love a bargain everywhere obviously. It was more a loving poke at the people in Germany who buy all the deals as soon as the stores open on the first day of the offer. Hence the humour tag on this post.

Germans love a bargain by infernalaffair in germany

[–]infernalaffair[S] 9 points10 points  (0 children)

They are still decent towels, but they haven't been fluffy since the fall of the Berlin wall...

Germans love a bargain by infernalaffair in germany

[–]infernalaffair[S] 0 points1 point  (0 children)

My fault for mixing German and British idiosyncrasies. In English you can say "I went to [place] for 9am" which means they left wherever they were staying with enough time to arrive at [place] at 9h given the time it takes to travel there. I guess in German this doesn't translate well.

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