Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Changing temperature powers sensors in hard-to-reach places

04.09.2014

A centuries-old clock built for a king is the inspiration for a group of computer scientists and electrical engineers who hope to harvest power from the air.

The clock, powered by changes in temperature and atmospheric pressure, was invented in the early 17th century by a Dutch builder. Three centuries later, Swiss engineer Jean Leon Reutter built on that idea and created the Atmos mechanical clock that can run for years without needing to be wound manually.

Now, University of Washington researchers have taken inspiration from the clock’s design and created a power harvester that uses natural fluctuations in temperature and pressure as its power source. The device harvests energy in any location where these temperature changes naturally occur, powering sensors that can check for water leaks or structural deficiencies in hard-to-reach places and alerting users by sending out a wireless signal.

“Pressure changes and temperature fluctuations happen around us all the time in the environment, which could provide another source of energy for certain applications,” said Shwetak Patel, a UW associate professor of computer science and engineering and of electrical engineering.

The UW team will present its research at the Association for Computing Machinery’s International Joint Conference on Pervasive and Ubiquitous Computing this month in Seattle.

The system works like this: A metal bellows about the size of a cantaloupe is filled with a temperature-sensitive gas. When the gas heats and cools in response to the outside air temperature, it expands and contracts, causing the bellows to do the same. Small, cantilever motion harvesters are placed on the bellows and convert this kinetic energy into electrical energy. This powers sensors that also are placed on the bellows, and data collected by the sensors is sent wirelessly to a receiver.

A number of battery-free technologies exist that are powered by solar and ambient radio frequency waves. The researchers say this technology would be useful in places where sun and radio waves can’t always penetrate, such as inside walls or bridges and below ground where there might be at least small temperature fluctuations.

For instance, the device could be placed in an attic or inside a wall, and sensors would be tuned to check for water leaks. Similarly, when used inside a bridge, the sensors could detect any cracks forming or structural deficiencies. In both cases, the sensors would send a signal to the nearby powered receiver.

A temperature change of only 0.25 degrees Celsius creates enough energy to power the sensor node to read and send data wirelessly to a receiver 5 meters away. That means any slight shift in an office building’s air conditioning or the natural outside air temperature during the course of a day would be more than enough to activate the chemical in the bellows.

The UW’s technology uses temperature changes over time as its power source. Devices called thermoelectric generators also leverage varying temperatures for power, but these instruments require a temperature difference at an exact moment, such as in a place where one side is hot and the other is cool.

The researchers have filed patents for the technology and plan to make it smaller, about the size of a D battery. A future version would include four chemicals that activate in different temperature ranges so the same device could be used in various climates.

“I think our approach is unique,” said Chen Zhao, lead author and a UW doctoral student in electrical engineering. “We provide a simple design that includes some 3-D printed and off-the-shelf components. With our Web page and source code, others can download and build their own power harvesters.”

Other members of the research team are Joshua Smith, a UW associate professor of computer science and engineering and of electrical engineering; Sam Yisrael, an undergraduate student in electrical engineering; Sidhant Gupta, a former UW doctoral student; and Eric Larson, an assistant professor at Southern Methodist University and former UW doctoral student.

This research was funded by the Intel Science and Technology Center for Pervasive Computing at the UW and the Sloan Foundation.

###

For more information, contact the research team at temperature-harvester@uw.edu.

Michelle Ma | Eurek Alert!
Further information:
http://www.washington.edu/news/2014/09/03/changing-temperature-powers-sensors-in-hard-to-reach-places/

Further reports about: 3-D Computing Devices Pervasive energy inside pressure temperature waves

More articles from Power and Electrical Engineering:

nachricht Aluminum Clusters Shut Down Molecular Fuel Factory
06.07.2015 | Pacific Northwest National Laboratory

nachricht Compact Time Converter for reliable operation in harsh environments
03.07.2015 | Siemens AG

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Viaducts with wind turbines, the new renewable energy source

Wind turbines could be installed under some of the biggest bridges on the road network to produce electricity. So it is confirmed by calculations carried out by a European researchers team, that have taken a viaduct in the Canary Islands as a reference. This concept could be applied in heavily built-up territories or natural areas with new constructions limitations.

The Juncal Viaduct, in Gran Canaria, has served as a reference for Spanish and British researchers to verify that the wind blowing between the pillars on this...

Im Focus: X-rays and electrons join forces to map catalytic reactions in real-time

New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions

A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...

Im Focus: Iron: A biological element?

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.

Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...

Im Focus: Thousands of Droplets for Diagnostics

Researchers develop new method enabling DNA molecules to be counted in just 30 minutes

A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...

Im Focus: Bionic eye clinical trial results show long-term safety, efficacy vision-restoring implant

Patients using Argus II experienced significant improvement in visual function and quality of life

The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Conference on Regenerative Medicine in Leipzig: Last chance to submit abstracts until 2 July

25.06.2015 | Event News

World Conference on Regenerative Medicine: Abstract Submission has been extended to 24 June

16.06.2015 | Event News

MUSE hosting Europe’s largest science communication conference

11.06.2015 | Event News

 
Latest News

Aluminum Clusters Shut Down Molecular Fuel Factory

06.07.2015 | Power and Electrical Engineering

Veja Mate Offshore orders 67 wind turbines including record long-term service

06.07.2015 | Press release

The quantum middle man

06.07.2015 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>