Dr. Pradeep L. Shah Profile

Dr. Pradeep L. Shah

at Texas MicroPower Inc

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Proceedings Article | 5 May 2010 Paper

Autonomous energy harvesting embedded sensors for border security applications

Abhiman Hande, Pradeep Shah, James Falasco, Doug Weiner

Proceedings Volume 7666, 766624 (2010) https://doi.org/10.1117/12.850162

KEYWORDS: Sensors, Energy harvesting, Transducers, Solar energy, Fusion energy, Unattended ground sensors, Border security, Sensor networks, Solar cells, Homeland security

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Wireless networks of seismic sensors have proven to be a valuable tool for providing security forces with intrusion alerts even in densely forested areas. The cost of replenishing the power source is one of the primary obstacles preventing the widespread use of wireless sensors for passive barrier protection. This paper focuses on making use of energy from multiple sources to power these sensors. A system comprising of Texas Micropower's (TMP's) energy harvesting device and Crane Wireless Monitoring Solutions' sensor nodes is described. The energy harvesters are suitable for integration and for low cost, high volume production. The harvesters are used for powering sensors in Crane's wireless hub and spoke type sensor network. TMP's energy harvesting methodology is based on adaptive power management circuits that allow harvesting from multiple sources making them suitable for underground sensing/monitoring applications. The combined self-powered energy harvesting solutions are expected to be suitable for broad range of defense and industry applications. Preliminary results have indicated good feasibility to use a single power management solution that allows multi-source energy harvesting making such systems practical in remote sensing applications.

Proceedings Article | 29 April 2010 Paper

High-efficiency integrated piezoelectric energy harvesting systems

Abhiman Hande, Pradeep Shah

Proceedings Volume 7683, 76831B (2010) https://doi.org/10.1117/12.850193

KEYWORDS: Sensors, Transducers, Energy harvesting, Thin films, Wind energy, Magnetic sensors, Telecommunications, Energy efficiency, Microelectromechanical systems, Sensor networks

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This paper describes hierarchically architectured development of an energy harvesting (EH) system that consists of micro and/or macro-scale harvesters matched to multiple components of remote wireless sensor and communication nodes. The micro-scale harvesters consist of thin-film MEMS piezoelectric cantilever arrays and power generation modules in IC-like form to allow efficient EH from vibrations. The design uses new high conversion efficiency thin-film processes combined with novel cantilever structures tuned to multiple resonant frequencies as broadband arrays. The macro-scale harvesters are used to power the collector nodes that have higher power specifications. These bulk harvesters can be integrated with efficient adaptive power management circuits that match transducer impedance and maximize power harvested from multiple scavenging sources with very low intrinsic power consumption. Texas MicroPower, Inc. is developing process based on a composition that has the highest reported energy density as compared to other commercially available bulk PZT-based sensor/actuator ceramic materials and extending it to thin-film materials and miniature conversion transducer structures. The multiform factor harvesters can be deployed for several military and commercial applications such as underground unattended sensors, sensors in oil rigs, structural health monitoring, supply chain management, and battlefield applications such as sensors on soldier apparel, equipment, and wearable electronics.

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