Improved sensitivity of portable bio-sensor systems using lock-in detection method
- Authors
- Son, Ho-Hyun; Jung, In-Il; Kim, Doo Gun; Kim, Do-Gyun; Choi, Young-Wan
- Issue Date
- Feb-2009
- Publisher
- SPIE-INT SOC OPTICAL ENGINEERING
- Keywords
- high frequency; hybrid bio-system; lock-in; portable; sensitivity
- Citation
- OPTOELECTRONIC INTEGRATED CIRCUITS XI, v.7219
- Journal Title
- OPTOELECTRONIC INTEGRATED CIRCUITS XI
- Volume
- 7219
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/54276
- DOI
- 10.1117/12.809025
- ISSN
- 0277-786X
1996-756X
- Abstract
- Recently, a number of portable biosensors have been developed to check the health condition of human beings regardless of time and place. Though those sensors have a merit of a handy one, the signals are inevitably measured with intensive background noises. In order to detect a weak signal concealed in intensive background noises such as Johnson noise, 1/f noise, and shot noise, a special technique is essentially required. As of a special technique, the lock-in detection method is able to minimize the effects of these noises using modulated signal and reference signals. Previously, we applied the lock-in detection method to infrared detection system. The sensitivity of this system was decided by the 1/f noise at the photodetector. In this work, we have demonstrated the portable bio-sensor system using high frequency infrared laser diode and photodetector. Therefore, the main signal of interest may keep away from the effect of the 1/f noise with hybrid-type highly sensitive lock-in detection module. This technique provides the minimum detection range of 3 mV and the dynamic range of 25.8 dB at the noise level of 120 mV.
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Collections - College of ICT Engineering > School of Electrical and Electronics Engineering > 1. Journal Articles
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