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Groups > alt.os.linux > #51472
| From | Paul <nospam@needed.invalid> |
|---|---|
| Newsgroups | alt.os.linux, comp.os.linux.misc |
| Subject | Re: Here you go, Apple lovers! Eat this! |
| Date | 2018-11-02 02:16 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <prgq40$5ej$1@dont-email.me> (permalink) |
| References | (2 earlier) <011120180402308647%nospam@nospam.invalid> <preupu$34p$1@dont-email.me> <prf74b0d2g@news2.newsguy.com> <prgamm$atn$1@dont-email.me> <prgjfs$ka1$1@gonzo.alcatraz> |
Cross-posted to 2 groups.
Jasen Betts wrote:
> On 2018-11-02, Paul <nospam@needed.invalid> wrote:
>> Jean-David Beyer wrote:
>>> On 11/1/18 9:24 AM, Paul wrote:
>>>> The part that amazes me, is how quickly the
>>>> helium seems to incapacitate the phone. It's
>>>> like there's no seal at all around these things.
>>> When I had to design stuff to a certain military specification, some
>>> things had to be hermetically sealed. Helium leak detectors are used for
>>> this because helium can penetrate where air cannot.
>>>
>>> https://en.wikipedia.org/wiki/Helium_mass_spectrometer
"Output Drifting of Vacuum Packaged MEMS Sensors
Due to Room Temperature Helium Exposure"
https://file.scirp.org/pdf/JST_2013122009560886.pdf
Kim et al. [9] found that helium and hydrogen could permeate
CVD (Chemical Vapor Deposition) oxide sealed MEMS resonators
at elevated temperatures resulting in a degradation of Q values.
Annealing in a hydrogen or helium ambient at 170°C - 400°C
was found to increase microcavity pressure, as did reliability
testing at 100°C in air due to the 5 ppm helium present in the
atmosphere. The gradual cavity pressure increase was not observed
after operating in air 3000 hours at room temperature.
By sealing the CVD oxide plugs with an aluminum capping layer
this group could prevent hydrogen permeation into the CVD
sealed microcavities at elevated temperatures.
-------
Vacuum packaged resonating MEMS gyroscopes and voltage controlled
oscillators may also have a long-term drift problem when operated
in air if chip-scale packaging methods are employed. This has been
demonstrated by Kim with CVD sealed devices [9]. Enclosing these
devices in ceramic or metal packages with Kovar lids, like those
shown in Figure 2, can be used to prevent this long-term reliability
issue.
I think the person who wrote that article, is advocating taking
all the "fun" out of using MEMS.
Paul
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Here you go, Apple lovers! Eat this! Nomen Nescio <noreply@mixnym.net> - 2018-10-31 20:24 -0500
Re: Here you go, Apple lovers! Eat this! NumbLock <789456123@0.com> - 2018-10-31 20:20 -0700
Re: Here you go, Apple lovers! Eat this! William Unruh <unruh@invalid.ca> - 2018-11-01 14:40 +0000
Re: Here you go, Apple lovers! Eat this! Andy Burns <usenet@andyburns.uk> - 2018-11-19 08:12 +0000
Re: Here you go, Apple lovers! Eat this! Bobbie Sellers <bliss@mouse-potato.com> - 2018-11-01 07:50 -0700
Re: Here you go, Apple lovers! Eat this! Andy Burns <usenet@andyburns.uk> - 2018-11-01 07:09 +0000
Re: Here you go, Apple lovers! Eat this! nospam <nospam@nospam.invalid> - 2018-11-01 04:02 -0400
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-01 09:24 -0400
Re: Here you go, Apple lovers! Eat this! nospam <nospam@nospam.invalid> - 2018-11-01 09:30 -0400
Re: Here you go, Apple lovers! Eat this! Eric Stevens <eric.stevens@sum.co.nz> - 2018-11-02 11:46 +1300
Re: Here you go, Apple lovers! Eat this! nospam <nospam@nospam.invalid> - 2018-11-01 19:06 -0400
Re: Here you go, Apple lovers! Eat this! Chris <ithinkiam@gmail.com> - 2018-11-02 08:42 +0000
Re: Here you go, Apple lovers! Eat this! William Unruh <unruh@invalid.ca> - 2018-11-02 13:02 +0000
Re: Here you go, Apple lovers! Eat this! Eric Stevens <eric.stevens@sum.co.nz> - 2018-11-03 14:34 +1300
Re: Here you go, Apple lovers! Eat this! William Unruh <unruh@invalid.ca> - 2018-11-01 14:43 +0000
Re: Here you go, Apple lovers! Eat this! Jean-David Beyer <jeandavid8@verizon.net> - 2018-11-01 11:46 -0400
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-01 21:53 -0400
Re: Here you go, Apple lovers! Eat this! Jasen Betts <jasen@xnet.co.nz> - 2018-11-02 04:23 +0000
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-02 01:45 -0400
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-02 02:16 -0400
Re: Here you go, Apple lovers! Eat this! Nomen Nescio <noreply@mixnym.net> - 2018-11-01 08:45 -0500
Re: Here you go, Apple lovers! Eat this! Andy Burns <usenet@andyburns.uk> - 2018-11-01 15:00 +0000
Re: Here you go, Apple lovers! Eat this! John Hasler <jhasler@newsguy.com> - 2018-11-01 11:27 -0500
Re: Here you go, Apple lovers! Eat this! Nomen Nescio <noreply@mixnym.net> - 2018-11-01 15:25 -0500
Re: Here you go, Apple lovers! Eat this! Nomen Nescio <nobody@dizum.com> - 2018-11-08 10:06 +0100
Re: Here you go, Apple lovers! Eat this! Jean-David Beyer <jeandavid8@verizon.net> - 2018-11-08 08:11 -0500
Re: Here you go, Apple lovers! Eat this! John Hasler <jhasler@newsguy.com> - 2018-11-08 08:37 -0600
Re: Here you go, Apple lovers! Eat this! William Unruh <unruh@invalid.ca> - 2018-11-09 16:49 +0000
Re: Here you go, Apple lovers! Eat this! "Cybe R. Wizard" <cybe_r_wizard@WizardsTower.invalid> - 2018-11-09 15:25 -0600
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-10 00:42 -0500
Re: Here you go, Apple lovers! Eat this! Eric Stevens <eric.stevens@sum.co.nz> - 2018-11-09 13:56 +1300
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-01 22:04 -0400
Re: Here you go, Apple lovers! Eat this! Andy Burns <usenet@andyburns.uk> - 2018-11-02 06:41 +0000
Re: Here you go, Apple lovers! Eat this! Paul <nospam@needed.invalid> - 2018-11-02 04:20 -0400
Re: Here you go, Apple lovers! Eat this! Bobbie Sellers <bliss@mouse-potato.com> - 2018-11-02 05:51 -0700
Re: Here you go, Apple lovers! Eat this! The Natural Philosopher <tnp@invalid.invalid> - 2018-11-02 19:47 +0000
Re: Here you go, Apple lovers! Eat this! Wolf K <wolfmac@sympatico.ca> - 2018-11-02 16:31 -0400
Re: Here you go, Apple lovers! Eat this! The Natural Philosopher <tnp@invalid.invalid> - 2018-11-02 21:14 +0000
Re: Here you go, Apple lovers! Eat this! William Unruh <unruh@invalid.ca> - 2018-11-02 13:06 +0000
Re: Here you go, Apple lovers! Eat this! John Hasler <jhasler@newsguy.com> - 2018-11-02 07:19 -0500
Re: Here you go, Apple lovers! Eat this! John Hasler <jhasler@newsguy.com> - 2018-11-02 07:15 -0500
Re: Here you go, Apple lovers! Eat this! Nomen Nescio <nobody@dizum.com> - 2018-11-08 15:38 +0100
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