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Date: Fri, 17 Mar 2023 13:57:24 -0700
From: rjmcmahon <rjmcmahon@rjmcmahon.com>
To: Bruce Perens <bruce@perens.com>
Cc: Sebastian Moeller <moeller0@gmx.de>, libreqos
 <libreqos@lists.bufferbloat.net>, Dave Taht via Starlink
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Subject: Re: [Rpm] [Starlink]  On FiWi
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I'm curious as to why the detectors have to be replaced every 10 years. 
Regardless, modern sensors could give a thermal map of the entire 
complex 24x7x365. Fire officials would have a better set of eyes when 
they showed up as the sensor system & network could provide thermals as 
a time series.

Also, another "killer app" for Boston is digital image correlation & the 
cameras monitor stresses and strains on historic buildings valued at 
about $10M each. And that's undervalued because they're really 
irreplaceable. Similar for some in the Netherladns. Monitoring the 
groundwater with samples every 4 mos is ok - better to monitor the 
structure itself 24x7x365.

https://www.sciencedirect.com/topics/engineering/digital-image-correlation
https://www.bostongroundwater.org/

Bob

On 2023-03-17 13:37, Bruce Perens wrote:
> On Fri, Mar 17, 2023 at 12:19 PM rjmcmahon via Starlink
> <starlink@lists.bufferbloat.net> wrote:You’ll hardly ever have to
> deal with the annoying
> 
>> “chirping” that occurs when a battery-powered smoke detector
>> begins to
>> go dead, and your entire family will be alerted in the event that a
>> fire
>> does occur since hardwire smoke detectors can be interconnected.
> 
> Off-topic, but the sensors in these hardwired units expire after 10
> years, and they start beeping. The batteries in modern battery-powered
> units with wireless links expire after 10 years, along with the rest
> of the unit, and they start beeping.
> 
> There are exceptions, the first-generation Nest was pretty bad.