The Effects of Silicone Enclosure Colour on the Function of Optical Sensors

The colour of the silicone enclosure of an implantable reflectance-based optical probe plays a critical role in sensor performance. Red-coloured probes that are highly reflective to near-infrared light have been found to increase photodetector power by a factor of 6 for wavelengths between 660 and 9...

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Bibliographic Details
Published in:Biology (Basel, Switzerland) Switzerland), 2022-06, Vol.11 (6), p.932
Main Authors: Frank, Garrett, Askari, Shahbaz, Raschdorf, Katharina, Khosravi, Sadra, Kwon, Brian K., Shadgan, Babak
Format: Article
Language:English
Subjects:
absorption
Biocompatibility
biosensor
Biosensors
diagnostics
direct measurement
Heart
Hemodynamics
I.R. radiation
implantable
Infrared spectroscopy
Light emitting diodes
Optical properties
Oxygenation
phantom
Probes
Respiration
Sensors
Silicones
Spatial discrimination
Spinal cord injuries
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Summary:The colour of the silicone enclosure of an implantable reflectance-based optical probe plays a critical role in sensor performance. Red-coloured probes that are highly reflective to near-infrared light have been found to increase photodetector power by a factor of 6 for wavelengths between 660 and 950 nm and triple the magnitude of measured cardiac pulsations compared to traditional black probes. The increase in photodetector power and cardiac pulsation magnitude is presumably due to increased spatial range resulting from a higher magnitude of superficial tissue scattering. Conversely, probes with highly absorbent colours such as black and blue result in more stable signals and are expected to have higher spatial resolution and depth of penetration.
ISSN:2079-7737
2079-7737
DOI:10.3390/biology11060932