TEMPERATURE DEPENDENCE OF LED AND ITS THEORETICAL EFFECT ON PULSE OXIMETRY

Ambient temperature is known to affect the emission spectrum of a fight-emitting diode (LED). This study has investigated the effect of changes in ambient temperature on the emission spectra of two LED with peak emission wavelengths similar to those used in pulse oximetry. There was a 5.5-nm increas...

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Published in:British journal of anaesthesia : BJA 1991-11, Vol.67 (5), p.638-643
Main Authors: REYNOLDS, K.J., DE KOCK, J.P., TARASSENKO, L., MOYLE, J.T.B.
Format: Article
Language:English
Subjects:
Anesthesia
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Anesthesia: equipment, devices
Biological and medical sciences
Electrodes
Equipment Failure
Equipment: pulse oximeters
Infrared Rays
Light
Medical sciences
Models, Theoretical
Monitoring: pulse oximeters
Oximetry - instrumentation
Temperature
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container_issue 5
container_start_page 638
container_title British journal of anaesthesia : BJA
container_volume 67
creator REYNOLDS, K.J.
DE KOCK, J.P.
TARASSENKO, L.
MOYLE, J.T.B.
description Ambient temperature is known to affect the emission spectrum of a fight-emitting diode (LED). This study has investigated the effect of changes in ambient temperature on the emission spectra of two LED with peak emission wavelengths similar to those used in pulse oximetry. There was a 5.5-nm increase in the peak wavelength for a 660-nm LED, and a 7.8-nm increase in the peak wavelength for a 950-nm LED as temperature increased from 0 to 50 °C. Using a simple theoretical model based on the Beer-Lambert law, the effect of these shifts in wavelength on pulse oximeter accuracy was examined and found to be negligible over the temperature range studied.
doi_str_mv 10.1093/bja/67.5.638
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subjects Anesthesia
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Anesthesia: equipment, devices
Biological and medical sciences
Electrodes
Equipment Failure
Equipment: pulse oximeters
Infrared Rays
Light
Medical sciences
Models, Theoretical
Monitoring: pulse oximeters
Oximetry - instrumentation
Temperature
title TEMPERATURE DEPENDENCE OF LED AND ITS THEORETICAL EFFECT ON PULSE OXIMETRY
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