Results 11 to 20 of about 25,049 (217)

High-resolution nanoscale NMR for arbitrary magnetic fields

Communications Physics, 2023
Nitrogen vacancy (NV) centers are a major platform for the detection of nuclear magnetic resonance (NMR) signals at the nanoscale. To overcome the intrinsic electron spin lifetime limit in spectral resolution, a heterodyne detection approach is widely ...
Jonas Meinel, MinSik Kwon, Rouven Maier, Durga Dasari, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, Vadim Vorobyov, Jörg Wrachtrup   +8 more
doaj   +1 more source

Photoacoustic heterodyne breath sensor for real-time measurement of human exhaled carbon monoxide

Photoacoustics, 2022
A breath sensor for real-time measurement of human exhaled carbon monoxide is reported. This breath sensor is based on a novel photoacoustic heterodyne gas sensing technique, which combines the conventional photoacoustic spectroscopy with the beat ...
Biao Li, Chaofan Feng, Hongpeng Wu, Suotang Jia, Lei Dong   +4 more
doaj   +1 more source

Dual pulse heterodyne distributed acoustic sensor system employing SOA-based fiber ring laser

Frontiers in Physics, 2023
Distributed Acoustic Sensor (DAS) has potential in applications such as hydroacoustic detection. In this paper, a dual-pulse heterodyne distributed acoustic sensor (DAS) system using a semiconductor optical amplifier (SOA)-based fiber ring laser (FRL) is
Chunxi Zhang, Chunxi Zhang, Sufan Yang, Sufan Yang, Sufan Yang, Xiaxiao Wang, Xiaxiao Wang   +6 more
doaj   +1 more source

Local phase measurements of light in a one-dimensional photonic crystal [PDF]

, 2001
For the first time the local optical phase evolution in and around a small, o­ne-dimensional photonic crystal has been visualized with a heterodyne interferometric photon scanning tunnelling microscope.
Balistreri, M.L.M., Flück, E., Hulst, N.F. van, Korterik, J.P., Kuipers, L., Otter, A.M.   +5 more
core   +8 more sources

Acousto-Optic Comb Interrogation System for Random Fiber Grating Sensors with Sub-nm Resolution

Sensors, 2021
The broad-frequency response and nanometer-range displacements of ultrasound detection are essential for the characterization of small cracks, structural health monitoring and non-destructive evaluation.
Dragos A. Poiana, Jose A. Garcia-Souto, Xiaoyi Bao   +2 more
doaj   +1 more source

An Effective Method for Enhancing Heterodyne Efficiency by Comparing the Effect of Degree of Polarization on an Uplink Path and a Downlink Path

Photonics, 2022
By analyzing the effect of the degree of polarization (DoP) of the partially coherent Gaussian Schell-model (GSM) beam on a heterodyne system of an uplink path and a downlink path, we developed an innovative and noteworthy theory according to which σsy ...
Zhenkun Tan, Jiao Wang, Yingxiu Kong, Sichen Lei, Pengfei Wu   +4 more
doaj   +1 more source

High-Sensitivity Phase Detection of Reflection-Type Guided-Mode Resonance Sensor Based on Rotating Azimuth Angle Using a Heterodyne Interferometer

Photonics, 2022
A high-sensitivity phase-detection system is proposed for a reflection-type guided-mode resonance (GMR) sensor, which achieves the resonance condition by rotating the azimuth angle and utilizes an electro-optic (EO) heterodyne interferometer. By rotating
Jaturon Tongpakpanang, Wen-Kai Kuo
doaj   +1 more source

High SNR Φ-OTDR with Multi-Transverse Modes Heterodyne Matched-Filtering Technology

Sensors, 2021
Phase-sensitive optical time domain reflectometer (Φ-OTDR) has attracted attention in scientific research and industry because of its distributed dynamic linear response to external disturbances.
Yifan Liu, Junqi Yang, Bingyan Wu, Bin Lu, Luwei Shuai, Zhaoyong Wang, Lei Ye, Kang Ying, Qing Ye, Ronghui Qu, Haiwen Cai   +10 more
doaj   +1 more source

In-Situ Detection for Atomic Density in the K-Rb-²¹Ne Co-Magnetometer via an Optical Heterodyne Interferometry

Photonics, 2023
The low-frequency fluctuations of the atomic density within the cell can induce the longterm drift of the K-Rb-21Ne spin-exchange relaxation-free (SERF) co-magnetometer output, such that the accurate measurement of in situ atomic density is of great ...
Sixun Liu, Zhuo Wang, Yueyang Zhai
doaj   +1 more source

The Influence of On-Orbit Micro-Vibration on Space Gravitational Wave Detection

Photonics, 2023
Large-aperture space telescopes have played an important role in space gravitational wave detection missions. Overcoming the influence of the space environment on interstellar laser distance measurement and realistic high-concentration laser distance ...
Zhiwei Chen, Chao Fang, Zhenpeng Wang, Changxiang Yan, Zhi Wang   +4 more
doaj   +1 more source