Dual-interrogation method for suppressing light shift in Rb 778 nm two-photon transition optical frequency standard.

In this study, a dual-interrogation (DI) method was used to suppress the light shift in the Rb 778 nm 5S→5D two-photon transition optical frequency standard (2hν-OFS). The approach used an auxiliary system to calibrate the light shift of the primary system in real time to mitigate the absolute light shift and suppress the sensitivity of the system to the light power. Results show that after using the DI method, the absolute light shift and light-power sensitivity of the system were reduced by a factor of 10.

Development of a Wearable Gesture Recognition System Based on Two-Terminal Electrical Impedance Tomography.

This paper proposes a low-cost, wearable gesture recognition system based on the two-terminal electrical impedance tomography (EIT) technique. The system includes a wearable EIT sensor of eight electrodes, a hardware device, and gesture recognition software running on a PC. Nine different gestures can be stably identified from the measured impedance changes through machine learning algorithms.