A heterodyne interference system was developed for position measurement. A stabilized optical-frequency comb is used as the laser source. The preliminary experiment to measure a distance of 22.478 m shows a drift of 1.6 μm in 20 minutes after the temperature compensation. Comparison and frequency shift experiments have been done for a distance of about 7.493 m. The experimental results show that the drift is mainly caused by environmental condition changes and the vibration of the table and floor also has some effects. It was verified that the absolute distance measurement can be realized by fringe scanning and frequency-shifting methods.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.20.002725 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Accurate operando measurement of AlGaN/GaN HEMTs channel temperature and optimization of thermal design.
Nanotechnology
January 2025
Electronic Sci.&Eng., Xi'an Jiaotong University, 28 Xianning West Road,Beilin District, Xi 'an, Shaanxi Province, China, Xi'an, 710049, CHINA.
The accurate estimation of the temperature distribution of the GaN based power devices and optimization of the device structure is of great significance to possibly solve the self-heating problem, which hinders the further enhancement of the device performances. We present here the operando temperature measurement with high spatial resolution using Raman spectroscopy of AlGaN/GaN high electron mobility transistors (HEMTs) with different device structures and explore the optimization of the device thermal design accordingly. The lateral and depth temperature distributions of the single-finger HEMT were characterized.
View Article and Find Full Text PDFAnalysis of the Top Articles and Authors of the Journal of Orthopaedic Trauma and Bibliometric Comparison of Impact Factors of Orthopaedic Surgery Journals.
J Orthop Trauma
January 2025
Department of Orthopaedic Surgery, Medical City Denton, 3535 S Interstate 35, Denton, TX 76210, United States.
Objectives: To determine the top 100 cited authors and the top 20 articles in the Journal of Orthopaedic Trauma (JOT) and compare its impact factor to orthopaedic and non-orthopaedic surgery literature.
Design: Review.
Methods: The Web of Science database was used to determine the top 100 cited authors and top 20 cited articles that originated in JOT from 1995 to the present.
Analysis of trajectory transection rate on four-lane divided rural highway curves.
Traffic Inj Prev
January 2025
Department of Civil Engineering, Indian Institute of Technology, Indore, India.
Objective: The study aims to develop continuous trajectory profiles along curves with minimal error. It also focuses on formulating a percentage trajectory transection rate model as a function of geometric parameters (e.g.
View Article and Find Full Text PDFDifferent measures of fundamental frequency and vocal satisfaction among transgender men and women.
Codas
January 2025
Departamento de Saúde Interdisciplinaridade e Reabilitação, Faculdade de Ciências Médicas, Universidade Estadual de Campinas - UNICAMP - Campinas (SP), Brasil.
Purpose: To verify possible correlations between fo and voice satisfaction among Brazilian transgender people.
Methods: An observational, cross-sectional quantitative study was conducted with the Trans Woman Voice Questionnaire (TWVQ), voice recording (sustained vowel and automatic speech) and extraction of seven acoustic measurements related to fo position and variability in transgender people. Participants were divided into two groups according to gender.
The role of oscillations in grid cells' toroidal topology.
PLoS Comput Biol
January 2025
Kavli Institute for Systems Neuroscience and Centre for Algorithms in the Cortex, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
Persistent homology applied to the activity of grid cells in the Medial Entorhinal Cortex suggests that this activity lies on a toroidal manifold. By analyzing real data and a simple model, we show that neural oscillations play a key role in the appearance of this toroidal topology. To quantitatively monitor how changes in spike trains influence the topology of the data, we first define a robust measure for the degree of toroidality of a dataset.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!