Mechanical Vibration Detection Based on Dynamic Population Gratings Recorded in Er-Doped Optical Fiber

2018 ◽  
Vol 38 (9) ◽  
pp. 0906001
Author(s):  
陈溶 Chen Rong ◽  
陶传义 Tao Chuanyi
Keyword(s):  
Optical Fiber ◽  
Mechanical Vibration ◽  
Vibration Detection ◽  
Er Doped ◽  
Dynamic Population

Marbles Filter Based on Optical Fiber Sensor

2011 ◽  
Vol 79 ◽  
pp. 182-186
Author(s):  
Hai Feng Zhang ◽  
Ying Wang
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Vibration Detection ◽  
Front End

By introducing the principle,classification and characteristics of optical fiber sensor ,we can understand the optical fiber sensor to some extent.Based on this,it introduces a filter which is used in lockmaking industry.This device is mainly made up of vibrating disk,optical fiber sensor and solenoid valve.By this filter,including vibration,detection and blowing,we can distinguish different kinds of marbles, also,we can distinguish the front-end and back-end of some kind of mables to meet special need.In this case,just connecting every part to each other and make a special angle of fiber head,then,the filter can distinguish marbles automatically an it improves the efficiency heavily.

Disentangling ‘sciatica’ to understand and characterise somatosensory profiles and potential pain mechanisms

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Brigitte Tampin ◽  
Christopher Lind ◽  
Angela Jacques ◽  
Helen Slater
Keyword(s):  
Mechanical Vibration ◽  
Radicular Pain ◽  
Leg Pain ◽  
Heat Sensitivity ◽  
Loss Of Function ◽  
Pain Mechanisms ◽  
Vibration Detection ◽  
Lumbar Radicular Pain ◽  
Pain Experiences ◽  
Pain Descriptors

Abstract Objectives The study aimed to investigate if patients with lumbar radicular pain only and those with combined lumbar radicular pain + radiculopathy differ in their somatosensory profiles and pain experiences. Methods Quantitative sensory testing (QST) was performed in 26 patients (mean age 47 ± 10 years, 10 females) with unilateral leg pain in the L5 or S1 distribution in their main pain area (MPA) and contralateral mirror side, in the relevant foot dermatome on the symptomatic side and in the hand dorsum. Pain experience was captured on the painDETECT. Results Eight patients presented with lumbar radicular pain only and 18 patients with combined radicular pain + radiculopathy. Patients with radicular pain only demonstrated widespread loss of function (mechanical detection) bilaterally in the MPA (p<0.003) and hand (p=0.002), increased heat sensitivity in both legs (p<0.019) and cold/heat sensitivity in the hand (p<0.024). QST measurements in the dermatome did not differ compared to HCs and patients with radiculopathy. Patients with lumbar radiculopathy were characterised by a localised loss of function in the symptomatic leg in the MPA (warm, mechanical, vibration detection, mechanical pain threshold, mechanical pain sensitivity p<0.031) and dermatome (mechanical, vibration detection p<0.001), consistent with a nerve root lesion. Pain descriptors did not differ between the two groups with the exception of numbness (p<0.001). Patients with radicular pain did not report symptoms of numbness, while 78% of patients with radiculopathy did. Conclusions Distinct differences in somatosensory profiles and pain experiences were demonstrated for each patient group, suggesting differing underlying pain mechanisms.

scholarly journals Optical Fiber Amplifiers and Their Applications. Hybrid Er-Doped Fiber Amplifiers for Wavelength-Division Multiplexing Transmission Systems.

1997 ◽  
Vol 25 (2) ◽  
pp. 158-163
Author(s):  
Motoki KAKUI ◽  
Tomonori KASHIWADA ◽  
Koji NAKAZATO ◽  
Masashi ONISHI ◽  
Masayuki SHIGEMATSU ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Wavelength Division Multiplexing ◽  
Fiber Amplifiers ◽  
Transmission Systems ◽  
Wavelength Division ◽  
Optical Fiber Amplifiers ◽  
Er Doped

Research of Ni-Mn-Ga Shape Memory Alloy Based Mechanical Vibration Detection Device

2014 ◽  
Vol 1006-1007 ◽  
pp. 845-848
Author(s):  
Yong Zhi Cai
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mechanical Vibration ◽  
Vibration Signal ◽  
Experimental Results ◽  
Vibration Measurements ◽  
Vibration Detection ◽  
Vibration Sensing

The study explores the vibration sensing effect of Ni-Mn-Ga shape memory alloy, based on the experimental results, researched the characteristics of this alloy applied in mechanical vibration signal sensors, and describes the feasibility of this alloy used for vibration measurements.

Design and Fabrication of an Er-Doped Silica Optical Fiber with Six Photosensitive Subcores

2009 ◽  
Vol 26 (7) ◽  
pp. 074209 ◽  
Author(s):  
Li Jian ◽  
Wang Jing ◽  
Liu Peng ◽  
Lu Shao-Hua ◽  
Mao Xiang-Qiao ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Silica Optical Fiber ◽  
Er Doped

scholarly journals Optical Fiber Based Distributed Mechanical Vibration Sensing

2021 ◽  
Author(s):  
Vít Novotný ◽  
Petr Sysel ◽  
Aleš Prokeš ◽  
Pavel Hanák ◽  
Karel Slavíček ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Mechanical Vibration ◽  
Single Mode ◽  
Mechanical Vibrations ◽  
Real Situation ◽  
Optical Link ◽  
Distributed Sensor ◽  
Sensing System ◽  
System Components ◽  
Vibration Sensing

The distributed long-range sensing system using the standard telecommunication single-mode optical fiber in a function of a distributed sensor for sensing of mechanical vibrations is described. Various events generating vibrations such as walking or running person, moving cars, trains and others can be detected, localized and classified. The sensor and related sensing system components were designed and constructed and the system was tested both in the laboratory and in the real situation with 88 km telecom optical link, and the results are presented.

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