We describe a technique to measure the position of dipolar scatterer based on self-homodyne detection scattered light. The method can theoretically reach Heisenberg limit, at which information gained about is constrained only by back action has applications in fields levitated optomechanics and trapped ions generally applicable determination confined light scatterers.

Interferometric position detection of levitated particles is crucial for the centre-of-mass (CM) motion cooling and manipulation of levitated particles. In combination with balanced detection and feedback cooling, this system has provided picometer scale position sensitivity, zeptonewton force detection, and sub-millikelvin CM temperatures. In this article, we develop an analytical model of thi...

Bluetooth Low Energy (BLE) is a Bluetooth standard with low energy consumption. Beacons using BLE transmit BLE signals, which can be received by smart phones running iOS or Android OS. At present, demonstration experiments are conducted. An indoor position detection using an ordered order-k Voronoi diagram was proposed. Beacons were installed in a building of Tokai University. Experiments are c...

This paper describes a portable vision-based obstacle detection system, intended for use by blind people. The system combines an obstacle detection system designed for AGVs with recalibration of ground position and a Kalman Filter based model of the person’s walking movement. The system uses stereo vision. Obstacle detection is achieved through comparison of the disparity seen with that expecte...

A novel three-dimensional probing technique for microparts with high aspect ratios is proposed. In this technique, a particle trapped optically at the optical fiber tip is used as a probe for position detection. In order to confirm the feasibility of this method, this paper demonstrates numerical computations about the optical force exerted on the probe sphere and the behavior of position detec...