Diabetics who rely on glucose monitors are alarmed by recall linked to 7 deaths

A manufacturing problem in Abbott glucose sensors for diabetes patients has been tied to at least seven deaths and hundreds of injuries worldwide.
IEEE

Lock-In Based Phase Fluorometric Dissolved Oxygen Sensor Interface With 4 kHz – 150 kHz Tunable Excitation Frequency and Frequency Error Calibration

Abstract: Optical dissolved oxygen (DO) concentration measurement based on phase fluorometric theory is one of the most promising DO concentration measurement methods with advantages of insensitivity ...