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Proceedings Paper

Bio-signal processing using a novel lock-in detection technique for the portable bio-optical systems
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Paper Abstract

Portable bio-optical systems have required not only small size but also high sensitive and precise detection technique. To achieve high sensitivity, portable bio-optical systems should be set up to minimize the effects of noises such as Johnson noise, 1/f noise, shot noise etc. In order to reduce the influence from these noises, we have applied a novel lock-in detection technique. The lock-in detection technique is able to effectively suppress these noises as choosing a frequency high enough to avoid 1/f noise and low enough to avoid parasitic noises occurred on high frequency. We use lock-in detection technique with a simple structure - several op-amplifiers and MOSFETs. Using the lock-in scheme, we recovered signals in the presence of overwhelming background noises without applying multistage amplifiers and filters. This technique provides high resolution measurements of relatively clean signals over several orders of magnitude and frequency by compared with conventional detection method. We have demonstrated portable bio-optical system using infrared LED and PD with our hybrid type lock-in detection module.

Paper Details

Date Published: 12 February 2008
PDF: 9 pages
Proc. SPIE 6897, Optoelectronic Integrated Circuits X, 689713 (12 February 2008); doi: 10.1117/12.762998
Show Author Affiliations
In-Il Jung, Chung-Ang Univ. (South Korea)
Doo Gun Kim, Chung-Ang Univ. (South Korea)
Woon-Kyung Choi, Chung-Ang Univ. (South Korea)
Do-Gyun Kim, Chung-Ang Univ. (South Korea)
Young-Wan Choi, Chung-Ang Univ. (South Korea)

Published in SPIE Proceedings Vol. 6897:
Optoelectronic Integrated Circuits X
Louay A. Eldada; El-Hang Lee, Editor(s)

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