Session Index

Nowadays, 2D space mapping, positioning, and navigation has become a popular and vital function in the human daily life especially for outdoor activities. Meanwhile, positioning and navigation still needs essential progress on accuracy and precision in 3D information as marching into the indoor applications. Several promising applications are location based indoor services, private home activity, medical care, environmental monitoring, police and firefighters assistance, intelligent transportation, industrial automation, guiding of vulnerable people, surveying and geodesy, construction assistance, decoration assistance, motion capturing, AR/MR applications, etc. The practical concerns are including the accuracy, the coverage area and range, the cost, the infrastructure, the market maturity, the privacy, the update rate, the interface, the integrity, the robustness, and the availability. Instead of 3D imaging, there are several competing approaches including WLAN/WiFi, RFID, ultra-wideband, and geomagnetism system. Actually, the optical approaches are the most effective ways t to construct the 3D indoor map through triangulation, time of flight, and stereo image. In this work, we will review the existing optic technologies including stereoscopic camera, structure light projection, and LiDar technology. Then, we will introduce the image processes for the 3D positioning and navigation. Finally, we will discuss on the challenges of the 3D imaging.

 

The Hartmann-Shack wavefront sensor is utilized to measure image aberrations of lens. We can complete batch wavefront detection by HS wavefront system. Finally, it can calculate the MTF to analyze the quality of the lens through wavefront measurements.

 

In this study, a displacement measurement technique with the polarized standing-wave interferometer is proposed. By means of the polarization technique, the two interference signals with phase quadrature were obtained. Through arc tangent and unwrapped operation, we could get the variety of phase, and further determine displacement of the target.

 

This article studies to build a polarized Linnik-type interferometry with a polarization pixel camera measure the biological samples. The system can observe living microorganisms in time, and also can obtain the surface topography at the same time. Then, we get the 3D structure of the microorganism through the Simplex algorithm.

 

The purpose of this study is applying shadow moiré technique to the tactile sensor. It is a necessary function for a robot to acquire environmental information and directly interact with the environment. The issues will be improved by shadow moiré which can measure the difference of tiny shadow shift.

 

We carried out the optical simulation of nanoparticles deposited on a microlens via FDTD to inspect its capability of recovering evanescent wave. The intensity of evanescent wave can be enhanced up to 90%, along with the reduction of FWHM, by using 3-layer nanoparticles with different size.