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Where can I find a more technical description of the "logging" device that weigh less than four hundredths of an ounce? Love to study that - power source, comm

Where can I find a more technical description of the "logging" device that weigh less than four hundredths of an ounce? Love to study that - power source, communication methods, etc.

mongol 10y ago
https://en.m.wikipedia.org/wiki/Light_level_geolocator https://en.m.wikipedia.org/wiki/Light_level_geolocator
- bahro 10y ago
  That's a really clever solution to a unique set of domain specific constraints!
- verytrivial 10y ago
  I had no idea this was a technique! From a British Antarctic Survey report on these devices[1]: Accuracy In field trials at Bird Island, South Georgia, the mean error (great-circle distance) in position estimation of static devices was 85 km, with standard deviations in latitudinal and longitudinal errors of 0.61° and 0.99°, respectively (BAS, unpublished data). [1] http://polaris.nipr.ac.jp/~penguin/oogataHP/pdfarticles/23p227-233.pdf http://polaris.nipr.ac.jp/~penguin/oogataHP/pdfarticles/23p2...
lorenzhs 10y ago
Unit conversion: 0.04oz is approximately 1.14g, which sounds pretty impressive. But it can't be much heavier because a common swift typically only weighs around 35-56g (that's 1¼–2oz) according to http://www.commonswift.org/swift_english.html http://www.commonswift.org/swift_english.html According to the Wikipedia article linked by mongol, these devices can be as light as 0.3g. It's a battery, a phototube, a clock, and a recording chip. Longitude can be reconstructed from the time of most/least light, whereas the length of day and night allow reconstruction of latitude. Battery life is between 6 months and 5 years.
tim333 10y ago
There are some pics and prices of similar devices here (form £95+vat) http://actionforswifts.blogspot.co.uk/2012/01/new-light-weight-geolocator-for-swifts.html http://actionforswifts.blogspot.co.uk/2012/01/new-light-weig... And some technical description in the paper, page 12 http://www.cell.com/current-biology/pdfExtended/S0960-9822(16)31063-6 http://www.cell.com/current-biology/pdfExtended/S0960-9822(1... I think they have a microprocessor, a battery, some sensors and flash memory. To get the data out you have to find/catch the swift and remove the device. The device wakes every 5 mins and records briefly.

Where can I find a more technical description of the "logging" device that weigh less than four hundredths of an ounce? Love to study that - power source, communication methods, etc.

mongol 10y ago

https://en.m.wikipedia.org/wiki/Light_level_geolocator https://en.m.wikipedia.org/wiki/Light_level_geolocator

bahro 10y ago
That's a really clever solution to a unique set of domain specific constraints!
verytrivial 10y ago
I had no idea this was a technique! From a British Antarctic Survey report on these devices[1]: Accuracy In field trials at Bird Island, South Georgia, the mean error (great-circle distance) in position estimation of static devices was 85 km, with standard deviations in latitudinal and longitudinal errors of 0.61° and 0.99°, respectively (BAS, unpublished data). [1] http://polaris.nipr.ac.jp/~penguin/oogataHP/pdfarticles/23p227-233.pdf http://polaris.nipr.ac.jp/~penguin/oogataHP/pdfarticles/23p2...

lorenzhs 10y ago

Unit conversion: 0.04oz is approximately 1.14g, which sounds pretty impressive. But it can't be much heavier because a common swift typically only weighs around 35-56g (that's 1¼–2oz) according to http://www.commonswift.org/swift_english.html http://www.commonswift.org/swift_english.html According to the Wikipedia article linked by mongol, these devices can be as light as 0.3g. It's a battery, a phototube, a clock, and a recording chip. Longitude can be reconstructed from the time of most/least light, whereas the length of day and night allow reconstruction of latitude. Battery life is between 6 months and 5 years.

tim333 10y ago

There are some pics and prices of similar devices here (form £95+vat) http://actionforswifts.blogspot.co.uk/2012/01/new-light-weight-geolocator-for-swifts.html http://actionforswifts.blogspot.co.uk/2012/01/new-light-weig... And some technical description in the paper, page 12 http://www.cell.com/current-biology/pdfExtended/S0960-9822(16)31063-6 http://www.cell.com/current-biology/pdfExtended/S0960-9822(1... I think they have a microprocessor, a battery, some sensors and flash memory. To get the data out you have to find/catch the swift and remove the device. The device wakes every 5 mins and records briefly.