Double lock-in amplifier Faraday rotation glucometer

We previously proposed a new approach to optical glucose sensing using Faraday rotation in glucose solutions which we called the MORE effect “magnetic optical rotatory effect”. Here we introduce an improved light detection method using a double lock-in amplifier technique. We present experimental data to confirm the concept of using a double lock-in amplifier technique to improve SNR by separating a small, narrow band signal from interfering noise. Preliminary results show excellent SNR with input laser intensity at 300 μW, suggesting that safety standards for short duration laser exposure in the eye can be met