Agriculture News

September 25, 2018

Purdue Scale Up Conference opens with talks by Mitch Daniels and Akinwumi Adesina

WEST LAFAYETTE, Ind. – Expanding technologies that can improve and save millions of lives will be the focus of Purdue University’s Scale Up Conference on Tuesday (Sept. 25) through Thursday (Sept. 27), the first of its kind in North America.

The event kicks off with remarks from Purdue University President Mitch Daniels and a keynote address from Akinwumi Adesina, World Food Prize laureate, president of the African Development Bank and Purdue alumnus. He will deliver his public keynote address at 4 p.m. on Tuesday (Sept. 25) at Stewart Center’s Loeb Playhouse.

“Purdue is proud to host the Scale Up Conference as one of our premiere 150th anniversary events,” Daniels said. “This conference will showcase efforts from around the world, including those led by our College of Agriculture, that ensure that discoveries and innovations gained from research can quickly benefit the maximum number of people living in developing countries.”

This event is part of Purdue's Giant Leaps Sesquicentennial Campaign and is part of the Ideas Festival theme “Giant Leaps Toward a Sustainable Economy and Planet: Innovate Today for a Sustainable Tomorrow.” The Ideas Festival is the centerpiece of the campaign and connects world-renowned speakers and Purdue expertise in a conversation on the most critical problems and opportunities facing the world.

The conference objectives are to enhance understanding of scale up techniques, establish a network among agricultural experts working in developing counties and, ultimately, aid in development of technologies that will feed our growing global population.

For more information about the Scale Up Conference visit: https://bit.ly/2KhV3CH

Writer: Emma Ea Ambrose, 765-494-2406, eeambros@purdue.edu

Source: Suzanne Nielsen, 765-496-1727, nielsens@purdue.edu


ABSTRACT

Solar Cell Photo-Luminescence Modulation for Optical Frequency Identification Devices

Walter Daniel Leon-Salas, Xiaozhe Fan

Purdue University, West Lafayette, IN, USA

doi: 10.1109/TCSI.2018.2867445

This paper presents a wireless optical communication scheme that uses solar cells to transmit information. Transmission of information with a solar cell is possible by exploiting the fact that high-efficiency solar cells are also good at emitting light. These emissions, called luminescent emissions, are a function of the voltage across the cell. Here, we take the advantage of this fact to modulate the luminescent emissions of a GaAs solar cell to transmit information. We call devices that use this type of communication optical frequency identification devices. A circuit model of a solar cell that includes luminescent emissions is presented along with a circuit that modulates the photo-luminescent radiation emitted by a solar cell while harvesting energy from it. An analysis of this circuit is presented and employed to suggest different modulation strategies. A prototype of the modulator was built and tested. Test results show good agreement with the circuit analysis. It is also shown how the proposed circuit can be used to implement pulse amplitude modulation and ON-OFF keying modulation. Experimental results show that the proposed communication system achieves a bit error rate of $1.6x 10⁻³ at a rate of 10 kb/s and at a distance of 50 cm.


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