Low power wireless sensor networks for infrastructure monitoring

Ghaed, Mohammad Hassan; Ghahramani, M.; Chen, Gregory; Fojtik, Matthew; Blaauw, David; Flynn, Michael P.; Sylvester, Dennis

doi:10.1117/12.916301

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…5,6 It has a 99 year half-life, which is well matched to the mission of unattended sensors supporting infrastructure lifetimes. 7,10 The remaining isotopes listed in Table 1 are available, but have no continuing commercial use, which makes their procurement much more expensive. One notable candidate, 121m Sn, is an isomer with a 55 year half-life.…”

Section: Isotope Choicesmentioning

confidence: 99%

Tritium-powered radiation sensor network

et al. 2016

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Isotope power supplies offer long-lived (100 years using 63 Ni), low-power energy sources, enabling sensors or communications nodes for the lifetime of infrastructure. A tritium beta-source (12.5-year half-life) encapsulated in a phosphor-lined vial couples directly to a photovoltaic (PV) to generate a trickle current into an electrical load. An inexpensive design is described using commercial-of-the-shelf (COTS) components that generate 100 μW e for nextgeneration compact electronics/sensors. A matched radiation sensor has been built for long-duration missions utilizing microprocessor-controlled sleep modes, low-power electronic components, and a passive interrupt driven environmental wake-up. The low-power early-warning radiation detector network and isotope power source enables no-maintenance mission lifetimes.

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Section: Isotope Choicesmentioning

confidence: 99%

Tritium-powered radiation sensor network

et al. 2016

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“…5,6 It has a 99-year half-life, which is perfect for sensors supporting infrastructure lifetimes. 7,10 The remaining isotopes listed in Table 1 Sn, is an isomer with a 55-year half-life and offers the possibility releasing the energy stored in the excited state of the nucleus when stimulated by an electron beam, thus triggering the 55-year half-life power generation phase on-demand. 8 …”

Section: Isotope Choicesmentioning

confidence: 99%

Tritium-Powered Radiation Sensor Network

Litz¹,

Katsis²,

Russo³

et al. 2015

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Sensors and Electron Devices Directorate, ARLApproved for public release; distribution is unlimited.ii REPORT DOCUMENTATION PAGEForm Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) Sep 20152. REPORT TYPE ARL-TR-7440 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTIsotope power supplies offer solutions for long-lived (100 years), low-power (100 μWe) energy sources. The energy density of nuclear batteries uniquely serves applications for sensors or communications nodes that are required to last the lifetime of infrastructure. Efficiencies less than 10% are typical for either direct (or indirect) energy conversion of radiation to electric current. A tritium ( 3 H) beta-source (12.5-year half-life) encapsulated in a phosphor-lined vial is coupled directly to a photovoltaic (PV) generating a trickle current into an electrical load. An inexpensive design approach is described consisting of commercially available components that generate 100 μWe for next-generation compact electronics and sensor applications. A total of 15 μWe electrical power is measured from individual 20-Ci tritium cassettes (80 cc) using gallium arsenide (GaAs) PVs. A compact radiation sensor (400 cc) has been designed and built to operate during long-lived missions. A low-power sensor architecture is described and implemented that uses microprocessor-controlled sleep modes, a judicious choice of lowpower electronics, and a passive interrupt driven environmental wake-up. The low-power early-warning radiation detector network combined with a long-lived isotope power source enables no-maintenance mission lifetimes dependent only on the half-life of an isotope of choice.15.

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Derzeitiger Stand der elektronischen „kontinuierlichen“ Augendruckmessung

Faschinger

2017

Klin Monatsbl Augenheilkd

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Intraocular pressure (IOP) is generally measured at individual points and usually only once, but rarely more often, during office hours and with various different instruments. This is probably inadequate for diagnosis, assessment of progression, and therapeutic decision making, since the IOP is not a static measurement, but rather one that is subject to greater or lesser fluctuations over shorter or longer periods. This has prompted the desire for more regular or even continuous measurements. This can be achieved with self-tonometers (not discussed in this article) or by using electronic aids with sensors in the eye (invasive; in the intraocular lens, in the ciliary sulcus, on the iris, in the posterior or anterior chamber, suprachoroidal or subconjunctival) or on the eye (non-invasive; sensor contact lens). Despite numerous advances and miniaturisations, there is as yet still no continuous measurement technique (either invasive or non-invasive) that can be used routinely, but development of such a device is at an advanced stage.

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Low power wireless sensor networks for infrastructure monitoring

Cited by 4 publications

References 24 publications

Tritium-powered radiation sensor network

Tritium-powered radiation sensor network

Tritium-Powered Radiation Sensor Network

Derzeitiger Stand der elektronischen „kontinuierlichen“ Augendruckmessung

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