LED-based temperature sensor

This work presents a method to determine the surface temperature of micro-photonic medical implants like LEDs. Our inventive step is to use the photonic emitter (LED) employed in an implantable device as its own sensor and develop readout circuitry to determine the surface temperature of the device....

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Bibliographic Details
Published in2017 IEEE Biomedical Circuits and Systems Conference (BioCAS) pp. 1 - 4
Main Authors Dehkhoda, Fahimeh, Soltan, Ahmed, Ponon, Nikhil, O'Neill, Anthony, Degenaar, Patrick
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Current measurement
LED
Light emitting diodes
optogenetics
surface temperature
Temperature dependence
Temperature measurement
temperature sensor
Temperature sensors
Voltage measurement
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Summary:This work presents a method to determine the surface temperature of micro-photonic medical implants like LEDs. Our inventive step is to use the photonic emitter (LED) employed in an implantable device as its own sensor and develop readout circuitry to determine the surface temperature of the device. There are two primary classes of applications where micro-photonics could be used in implantable devices; opto-electrophysiology, and fluorescence sensing. In such scenarios, intense light needs to be delivered to the target. As blue wavelengths are scattered strongly in tissue, such delivery needs to be either via optic fibres, two-photon approaches, or through local emitters. In the latter case, as light emitters generate heat, there is the potential for probe surfaces to exceed the 2°C regulatory. However, currently, there are no convenient mechanisms to monitor this in-situ. This paper, therefore, presents a method to measure the device surface temperature. The proposed sensing system has been designed in 0.35 μm CMOS technology which mainly includes a second generation current conveyor and an amplifier to bias LED and measured the temperature sensitive parameter.
DOI:10.1109/BIOCAS.2017.8325207