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LED-Based Temperature Sensor

Lookup NU author(s): Dr Fahimeh Dehkhoda, Dr Ahmed Abd El-Aal, Dr Nilhil Ponon, Professor Anthony O'Neill, Professor Patrick Degenaar



This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by IEEE, 2017.

For re-use rights please refer to the publisher's terms and conditions.


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 2ºC 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.

Publication metadata

Author(s): Dehkhoda F, Soltan A, Ponon N, O'Neill A, Degenaar P

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 13th IEEE Biomedical Circuits and Systems Conference (BioCAS 2017)

Year of Conference: 2017

Online publication date: 19/10/2017

Acceptance date: 02/04/2016

Date deposited: 31/01/2018

Publisher: IEEE