Improved sensitivity of portable bio-sensor systems using lock-in detection method

Son, Ho-Hyun; Jung, In-Il; Kim, Doo Gun; Kim, Do-Gyun; Choi, Young‐Wan

doi:10.1117/12.809025

SPIE Proceedings

2009

DOI: 10.1117/12.809025

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Improved sensitivity of portable bio-sensor systems using lock-in detection method

Ho-Hyun Son

In-Il Jung

Doo Gun Kim

et al.

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2010

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“…1 shows the distribution of the noise and signal power from an optical detector in terms of power per unit bandwidth [5]. The most noticeable feature of this curve is the steady increase of the noise power as the frequency approaches zero.…”

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confidence: 97%

Signal detection technique utilising ‘lock-in’ architecture using 2 ω _c harmonic frequency for portable sensors

et al. 2010

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A signal detection technique utilising a 'lock-in' architecture using the second-order harmonic frequency (2 v c ) applicable to portable opticalbiosensor systems is presented. The properties of frequency synthesis and filtering techniques are used to detect a weak signal concealed in intense background noise, such as thermal noise, 1/f noise and shot noise. Using the 2 v c lock-in, the main signal of interest keeps away from the influence of the 1/f noise, providing a much higher dynamic reserve. In this work, a portable biosensor system using the 2 v c frequency detection technique is demonstrated. The technique further enhances the minimum detectable range of 20 dB compared to the conventional DC lock-in method under the same conditions.

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confidence: 97%

Signal detection technique utilising ‘lock-in’ architecture using 2 ω _c harmonic frequency for portable sensors

et al. 2010

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Improved sensitivity of portable bio-sensor systems using lock-in detection method

Cited by 1 publication

References 9 publications

Signal detection technique utilising ‘lock-in’ architecture using 2 ω _c harmonic frequency for portable sensors

Signal detection technique utilising ‘lock-in’ architecture using 2 ω _c harmonic frequency for portable sensors

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Improved sensitivity of portable bio-sensor systems using lock-in detection method

Cited by 1 publication

References 9 publications

Signal detection technique utilising ‘lock-in’ architecture using 2 ω c harmonic frequency for portable sensors

Signal detection technique utilising ‘lock-in’ architecture using 2 ω c harmonic frequency for portable sensors

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Signal detection technique utilising ‘lock-in’ architecture using 2 ω _c harmonic frequency for portable sensors

Signal detection technique utilising ‘lock-in’ architecture using 2 ω _c harmonic frequency for portable sensors