On the feasibility of self-mixing interferometer sensing for detection of the surface electrocardiographic signal using a customized electro-optic phase modulator

Ahmad Ashrif A Bakar, Yah Leng Lim, Stephen J. Wilson, Miguel Fuentes, Karl Bertling, Thomas Taimre, Thierry Bosch, Aleksandar D. Rakić

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Optical sensing offers an attractive option for detection of surface biopotentials in human subjects where electromagnetically noisy environments exist or safety requirements dictate a high degree of galvanic isolation. Such circumstances may be found in modern magnetic resonance imaging systems for example. The low signal amplitude and high source impedance of typical biopotentials have made optical transduction an uncommon sensing approach. We propose a solution consisting of an electro-optic phase modulator as a transducer, coupled to a vertical-cavity surface-emitting laser and the self-mixing signal detected via a photodiode. This configuration is physically evaluated with respect to synthesized surface electrocardiographic (EKG) signals of varying amplitudes and using differing optical feedback regimes. Optically detected EKG signals using strong optical feedback show the feasibility of this approach and indicate directions for optimization of the electro-optic transducer for improved signal-to-noise ratios. This may provide a new means of biopotential detection suited for environments characterized by harsh electromagnetic interference.

Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalPhysiological Measurement
Volume34
Issue number2
DOIs
Publication statusPublished - Feb 2013

Fingerprint

Optical feedback
Electrooptical effects
Transducers
Electrocardiography
Interferometers
Modulators
Electromagnetic Phenomena
Surface emitting lasers
Signal-To-Noise Ratio
Magnetic resonance
Signal interference
Photodiodes
Electric Impedance
Imaging systems
Signal to noise ratio
Lasers
Magnetic Resonance Imaging
Safety
Direction compound

Keywords

  • biomedical instrumentation
  • optical EKG
  • self-mixing

ASJC Scopus subject areas

  • Biophysics
  • Physiology
  • Physiology (medical)

Cite this

On the feasibility of self-mixing interferometer sensing for detection of the surface electrocardiographic signal using a customized electro-optic phase modulator. / A Bakar, Ahmad Ashrif; Lim, Yah Leng; Wilson, Stephen J.; Fuentes, Miguel; Bertling, Karl; Taimre, Thomas; Bosch, Thierry; Rakić, Aleksandar D.

In: Physiological Measurement, Vol. 34, No. 2, 02.2013, p. 281-289.

Research output: Contribution to journalArticle

A Bakar, Ahmad Ashrif ; Lim, Yah Leng ; Wilson, Stephen J. ; Fuentes, Miguel ; Bertling, Karl ; Taimre, Thomas ; Bosch, Thierry ; Rakić, Aleksandar D. / On the feasibility of self-mixing interferometer sensing for detection of the surface electrocardiographic signal using a customized electro-optic phase modulator. In: Physiological Measurement. 2013 ; Vol. 34, No. 2. pp. 281-289.
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