Photrodes for physiological sensing

Stuart A. Kingsley; Sriram Sriram; Andrea Pollick; John Marsh

doi:10.1117/12.529473

10 June 2004 Photrodes for physiological sensing

Stuart A. Kingsley, Sriram Sriram, Andrea Pollick, John Marsh

Proceedings Volume 5317, Optical Fibers and Sensors for Medical Applications IV; (2004) https://doi.org/10.1117/12.529473
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

Abstract

This paper describes a paradigm shift in the technology for sensing electro-physiological signals. In recent years, SRICO has been developing small lithium niobate photonic electrodes, otherwise called "Photrodes” for measuring EEG and ECG signals. These extrinsic fiber-optic sensing devices exploit the extremely high electrical input impedance of Mach-Zehnder Intensity (MZI) electro-optic modulators to detect microvolt and millivolt physiological signals. Voltage levels associated with electrocardiograms are typically on the order of several millivolts, and such signals can be detected by capacitive pickup through clothing, i.e., the Photrode may be used in a non-contact mode. Electroencephalogram signals, which typically have an amplitude of several microvolts, require direct contact with the skin. However, this contact may be dry, eliminating the need for conductive gels. The electrical bandwidth of this photonic electrode system stretches from below 0.1 Hz to many tens of kHz and is constrained mainly by the signal processing electronics, not by the Photrode itself. The paper will describe the design and performance of Photrode systems and the challenging aspects of this new technology.

Citation Download Citation

Stuart A. Kingsley, Sriram Sriram, Andrea Pollick, and John Marsh "Photrodes for physiological sensing", Proc. SPIE 5317, Optical Fibers and Sensors for Medical Applications IV, (10 June 2004); https://doi.org/10.1117/12.529473

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available