Investigation of On-chip Temperature Measurement in Power Cycling Using Fibre Bragg Grating Sensors

Condition monitoring techniques underpin the successful drive towards the net zero economy, providing more accurate predictive maintenance for electrical infrastructure and hence increasing system service life. Fibre Bragg grating (FBG) sensors provide an electrically isolated temperature measurement, which can be utilized for fast and accurate semiconductor junction temperature estimation. Compared with traditional temperature-sensitive electrical parameters, FBG temperature measurement is immune to electromagnetic interference and is not affected by device ageing. In this paper, the procedure of on-chip FBG temperature measurement is presented in the context of power cycling for silicon diode test vehicles. Accuracy of the sensor transient response is discussed, alongside mitigating factors and potential avenues for future improvements.