h a l f b a k e r yTrying to contain nuts.
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So, it seems that electrochromic sunglasses have been thought of and
discussed on the Bakery since at least as early as 2001. Doing some
research online, however, reveals a disappointing lack of vision (*snigger) in
the development of them thus far.
Everyone knows expensive sunglasses are high-theft
items. They have a
nasty tendency of just... disappearing, in ways that cheapos don't seem to
suffer from. Well, advances in size reduction of certain technologies over
the last two decades seem to offer us a way to mitigate this problem. With
the inclusion of some sort of biometric sensor, like a fingerprint or iris
scanner, and a simple wear detection sensor, they could be programmed to
go completely opaque when removed, resuming transparency only when
unlocked with the owner's biometrics. Alternatively, for those who are
understandably wary of providing their biometric data, Bluetooth tech
provides a similarly convenient security option. By pairing it with a phone or
smart watch, it could be set to go opaque if it becomes disconnected from
the paired device, requiring a passkey to be entered on said device to
unlock them later.
You'd think not
https://www.youtube...watch?v=JWLti-oVwuw
[Skewed, Mar 31 2021]
Like this?
https://www.cntrave...-rooms-in-the-world
Osaka Capsule Inn [Skewed, Apr 01 2021]
[link]
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A low-tech alternative would be to have the sunglasses
having two layers of perpendicular polarisation (horizontal
and vertical) and a removable polarisation layer with
polarisation at 45º that slips in the gap between the two
layers. With all three polarisation layers, 50% of light can
get through; with the removable layer removed, no light can
get through. |
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To secure the sunglasses, just remove the intermediate layer
and keep in a separate location (e.g. in your wallet). |
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Alternatively (and much more secure), the removable
intermediate layer could be a 'coded' array of different
refractive index areas (with front and back layer of the
glasses correspondingly coded with refractive index areas).
Without the intermediate layer the image through the
sunglasses would fuzzy/garbled; with the intermediate layer
the image through the lens would be clear. |
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//So, it seems that electrochromic sunglasses have been
thought of and discussed on the Bakery since at least as early
as 2001// |
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Haven't they existed since the 90's or before? |
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Meh, can't be bothered to look any more, Google smart glass
has been around since 2011 but I'm sure I remember some TV
news pieces on wannabe cyber types & their home brew
versions from way before that, |
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Why not have them not-go-opaque, it unnecessarily alerts
the thief to the fact they've built
in
security, instead think 'internet of things', go with GPS or
phone mast tracking & upload what they see when they
wear them to the cloud instead. |
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Leave the Zaphod anti fear effect as a manual feature you
activate when the police or owner challenges them. |
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//sunglasses having two layers of perpendicular
polarisation (horizontal and vertical) and a removable
polarisation layer with polarisation at 45º that slips in the
gap between the two layers. With all three polarisation
layers, 50% of light can get through; with the removable
layer removed, no light can get through.// |
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This would be a very elegant solution, except polarizing
filters really don't work like that. A horizontal polarizing
filter is just a grid of fine black horizontal lines, light
wobbling in the vertical orientation just gets absorbed. A
polarizing filter doesn't CONVERT light TO one polarity, it
just absorbs everything else. So your glasses would just
be opaque, horizontal polarizer absorbs the vertically
polarized light the vertical polarizer absorbs the
remaining horizontally polarized light, the 45 degree
filter wouldn't have much effect. |
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There are optics to do clever things with polarization, you
can get beam splitters which will transmit one polarity
and reflect another, and things like Wollaston prisms that
create two diverging opposite polarized beams from an
unpolarized input. |
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I don't know if GPS tracking chips, and the required power source, can
be made small enough to fit unobtrusively on a pair of sunglasses. |
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The problem with removable polarized filters is that they aren't the best
option for security. Anyone can steal the sunglasses, and simply order
replacement filters from the company. Before long there would be
knockoff filters available on eBay and Amazon, so even the company's
attempts to verify ownership would be got around too readily. Plus
there's the inconvenience factor, of having to remove two of these
things (probably about as difficult to reinsert as contact lenses), and
the risk of losing or damaging the filters. If the idea is to solve the
problem of sunglasses walking away, having a mechanism involving
even more easily lost components than the sunglasses themselves
seems counterproductive. |
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//This would be a very elegant solution, except
polarizing filters really don't work like that. A
horizontal polarizing filter is just a grid of fine black
horizontal lines, light wobbling in the vertical
orientation just gets absorbed. A polarizing filter
doesn't CONVERT light TO one polarity, it just
absorbs everything else. So your glasses would just
be opaque, horizontal polarizer absorbs the
vertically polarized light the vertical polarizer
absorbs the remaining horizontally polarized light,
the 45 degree filter wouldn't have much effect.// |
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Do a Google search for Malus' Law or three-polariser
experiment. A bit counter-intuitive at first but you get
a better understanding of polarizing filters. |
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//I don't know if GPS tracking chips, and the required
power
source, can be made small enough to fit unobtrusively on a
pair of sunglasses// |
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You'd think not <link> wouldn't you. |
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But a bunch of people at
Sony, Google & Samsung think otherwise, at least for the
wireless signal tracking with cell phone masts option, if
they
think
they can actually fit a wireless transmitter in a contact lens
then I'm pretty sure we can already get it into a pair of
glasses, as it happens they must think they can get chips
into contact lenses as well so.. [shrugs]. |
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If they think can fit all that into a contact lens (including a
transmitter for their image capture) then I'm
very sure we can already fit everything the glasses need
into it's
arms & frame. |
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Power is a problem, you can get pretty
small batteries but they'll still run out sooner or later,
probably
need the internet of things to be more ubiquitous (if that
ever happens) so it can piggy back it's power
off that, it's broadcast baby. |
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//This would be a very elegant solution, except polarizing filters really don't work like that. A horizontal polarizing filter is just a grid of
fine black horizontal lines, light wobbling in the vertical orientation just gets absorbed. A polarizing filter doesn't CONVERT light TO one
polarity, it just absorbs everything else. So your glasses would just be opaque, horizontal polarizer absorbs the vertically polarized light
the vertical polarizer absorbs the remaining horizontally polarized light, the 45 degree filter wouldn't have much effect.// |
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You'd think so, wouldn't you.
However, what xaviergisz said. |
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There's (apparently) this wierd quantum effect where intercalating polarised filters does convert the light to a new polarisation.
It's one of the reasons physicists go on about measuring something changing the result. |
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//intercalating polarised filters// |
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{Looks around suspiciously for the intercalary twin} |
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Is it possible that "interpolating" is meant? |
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"Light finds a way!" </JeffGoldblum> |
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//Malus' Law or three-polariser experiment.// |
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Well, that's the first time I've had my mind slightly blown in a
while. Especially on something optical. I even, occasionally,
use polarization in fluorescence microscopy because if a
fluorophore rotates before it emits light, it will likely change
the polarity, so you get information about the orientation and
freedom of movement in individual molecules. Which is nice. |
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Loris, that video is 4 years old, and says they filed patents. Has any
progress been made towards a working prototype since? |
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Brutal: was the care home too expensive? |
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//Brutal: was the care home too expensive?// |
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Like this perhaps? <link> should help get care home costs
down that. |
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//Is it possible that "interpolating" is meant?// |
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That's one of the meanings of intercalate, yes. |
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Google pulls this from Oxford Languages: |
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intercalate
verb
past tense: intercalated; past participle: intercalated
1. insert (an intercalary period) in a calendar.
"a system was introduced to intercalate an extra month in the calendar"
2. insert (something) between layers in a crystal lattice, geological formation, or other structure.
"the interlayer spaces of the graphite host lattice are filled with intercalated layers"
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21 Quest - are you looking at Skewed's video link? |
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The only video I see looks like a tourism infomercial for the Japanese
island of Kyushu. |
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