Interrogation of High-Finesse FBG Resonators by Laser- Frequency Locking for High-Sensitivity Strain Sensing

2006 ◽  
Author(s):  
G. Gagliardi ◽  
M. Salza ◽  
P. Ferraro ◽  
P. De Natale
Keyword(s):  
High Sensitivity ◽  
Laser Frequency ◽  
Strain Sensing ◽  
Frequency Locking ◽  
High Finesse

scholarly journals On-chip high sensitivity laser frequency sensing with Brillouin mutually-modulated cross-gain modulation

2013 ◽  
Vol 21 (7) ◽  
pp. 8605 ◽  
Author(s):  
Feng Gao ◽  
Ravi Pant ◽  
Enbang Li ◽  
Christopher G. Poulton ◽  
Duk-Yong Choi ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Laser Frequency ◽  
Gain Modulation ◽  
Cross Gain Modulation ◽  
On Chip

Pulse Laser Frequency Locking Method Based on Molecular Absorption

2019 ◽  
Vol 39 (10) ◽  
pp. 1028005
Author(s):  
闫庆 Yan Qing ◽  
袁萌 Yuan Meng ◽  
何甜甜 He Tiantian ◽  
陈宁 Chen Ning ◽  
刘晶晶 Liu Jingjing ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Laser Frequency ◽  
Molecular Absorption ◽  
Frequency Locking

Revisiting the laser frequency locking method using acousto-optic frequency modulation transfer spectroscopy

2016 ◽  
Vol 14 (12) ◽  
pp. 121401-121405 ◽  
Author(s):  
Yukun Luo Yukun Luo ◽  
Shuhua Yan Shuhua Yan ◽  
Aiai Jia Aiai Jia ◽  
Chunhua Wei Chunhua Wei ◽  
Zehuan Li Zehuan Li ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
Laser Frequency ◽  
Modulation Transfer ◽  
Frequency Locking

Conductive PVDF-HFP/CNT composites for strain sensing

2016 ◽  
Vol 09 (02) ◽  
pp. 1650024 ◽  
Author(s):  
Bin Hu ◽  
Yaolu Liu ◽  
Ning Hu ◽  
Liangke Wu ◽  
Huiming Ning ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Vinylidene Fluoride ◽  
High Sensitivity ◽  
Tunneling Effect ◽  
Gauge Factor ◽  
Metal Foil ◽  
Strain Sensing ◽  
Good Dispersion ◽  
Dispersion State ◽  
Addition Amount

A strain sensor based on the composites of poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) filled by multi-walled carbon nanotube (MWNT) was prepared using a proposed fabrication process. Three kinds of MWNT loadings, i.e., 1.0[Formula: see text]wt.%, 2.0[Formula: see text]wt.% and 3.0[Formula: see text]wt.% were employed. Due to good dispersion state of MWNT in PVDF-HFP matrix, which was characterized by scanning electron microscope (SEM), this sensor was found to be of high sensitivity and stable performance. The sensor’s piezoresistivity varied in a weak nonlinear pattern, which was probably caused by the tunneling effect among neighboring MWNTs. The gauge factor of the sensor of 1.0[Formula: see text]wt.% MWNT loading was identified to be the highest, i.e., 33. This sensor gauge factor decreased gradually with the increase of addition amount of MWNT, which was 5 for the sensor of 3.0[Formula: see text]wt.% MWNT loading. This gauge factor was still higher than that of conventional metal-foil strain sensors. The electrical conductivity of PVDF-HFP/MWNT composites was also studied. It was found that with the increase of the addition amount of MWNT, the electrical conductivity of the PVDF-HFP/MWNT composites varied in a perfect percolation pattern with a very low percolation threshold, i.e., 0.77 vol.%, further indicating the very good dispersion of MWNT in the PVDF-HFP matrix.

scholarly journals Cavity Ring-Down Methane Sensor for Small Unmanned Aerial Systems

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 454 ◽  
Author(s):  
Benjamin Martinez ◽  
Thomas W. Miller ◽  
Azer P. Yalin
Keyword(s):  
Near Infrared ◽  
High Sensitivity ◽  
Unmanned Aerial Systems ◽  
Test Results ◽  
Methane Sensor ◽  
Open Path ◽  
Low Mass ◽  
Aerial Systems ◽  
High Finesse ◽  
Cavity Ring Down

We present the development, integration, and testing of an open-path cavity ring-down spectroscopy (CRDS) methane sensor for deployment on small unmanned aerial systems (sUAS). The open-path configuration used here (without pump or flow-cell) enables a low mass (4 kg) and low power (12 W) instrument that can be readily integrated to sUAS, defined here as having all-up mass of <25 kg. The instrument uses a compact telecom style laser at 1651 nm (near-infrared) and a linear 2-mirror high-finesse cavity. We show test results of flying the sensor on a DJI Matrice 600 hexacopter sUAS. The high sensitivity of the CRDS method allows sensitive methane detection with a precision of ~10–30 ppb demonstrated for actual flight conditions. A controlled release setup, where known mass flows are delivered, was used to simulate point-source methane emissions. Examples of methane plume detection from flight tests suggest that isolated plumes from sources with a mass flow as low as ~0.005 g/s can be detected. The sUAS sensor should have utility for emissions monitoring and quantification from natural gas infrastructure. To the best of our knowledge, it is also the first CRDS sensor directly deployed onboard an sUAS.

Diode laser frequency locking using Zeeman effect and feedback in temperature

2010 ◽  
Vol 49 (5) ◽  
pp. 871 ◽  
Author(s):  
Weliton Soares Martins ◽  
Mayara Grilo ◽  
Manoel Brasileiro ◽  
Orlando di Lorenzo ◽  
Marcos Oriá ◽  
...  
Keyword(s):  
Diode Laser ◽  
Zeeman Effect ◽  
Laser Frequency ◽  
Frequency Locking

A practical direct current discharge helium absorption cell for laser frequency locking at 1083 nm

1996 ◽  
Vol 67 (9) ◽  
pp. 3003-3004 ◽  
Author(s):  
Weijian Lu ◽  
Dragana Milic ◽  
Maarten D. Hoogerland ◽  
Marcus Jacka ◽  
Kenneth G. H. Baldwin ◽  
...  
Keyword(s):  
Direct Current ◽  
Laser Frequency ◽  
Absorption Cell ◽  
Frequency Locking ◽  
Current Discharge ◽  
Direct Current Discharge

Nanoimprinted Polymer Micro/Nanofiber Bragg Gratings for High-Sensitivity Strain Sensing

2013 ◽  
Vol 25 (1) ◽  
pp. 22-24 ◽  
Author(s):  
Fuxing Gu ◽  
Huakang Yu ◽  
Wei Fang ◽  
Limin Tong
Keyword(s):  
High Sensitivity ◽  
Bragg Gratings ◽  
Strain Sensing
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