Pen harvester for powering a pulse rate sensor

Vishwas Bedekar, Josiah Oliver, Shashank Priya

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Rapid developments in the area of micro-sensors for various applications such as structural health monitoring, bio-chemical sensors and pressure sensors have increased the demand for portable, low cost, high efficiency energy harvesting devices. In this paper, we describe the scheme for powering a pulse rate sensor with a vibration energy harvester integrated inside a pen commonly carried by humans in the pocket close to the heart. Electromagnetic energy harvesting was selected in order to achieve high power at lower frequencies. The prototype pen harvester was found to generate 3 mW at 5 Hz and 1 mW at 3.5 Hz operating under displacement amplitude of 16 mm (corresponding to an acceleration of approximately 1.14 grms at 5 Hz and 0.56 g rms at 3.5 Hz, respectively). A comprehensive mathematical modelling and simulations were performed in order to optimize the performance of the vibration energy harvester. The integrated pen harvester prototype was found to generate continuous power of 0.46-0.66 mW under normal human actions such as jogging and jumping which is enough for a small scale pulse rate sensor.

Original languageEnglish (US)
Article number105105
JournalJournal of Physics D: Applied Physics
Issue number10
StatePublished - 2009
Externally publishedYes


Dive into the research topics of 'Pen harvester for powering a pulse rate sensor'. Together they form a unique fingerprint.

Cite this