Exploring the applicability of field measurements of mid-infrared reflectance using a portable band-pass filter type radiometer to assess paddy rice yields

Abstract In this work, different structures are designed based on graphene square-nanoring resonator (GSNR) and simulated by the three-dimensional finite-difference time-domain (3D-FDTD) method. Depending on the location and number of graphene nanoribbons (GNR), the proposed structures can be utilized as a band-pass filter, wavelength demultiplexer, or power splitter in the mid-infrared (MIR) wavelengths. The tunability of the suggested assemblies is easily controlled by changing the dimensions and/or the chemical potential of the GSNRs. Benefiting from the nanoscale and ultra-compact GNRs, these structures can be proposed as basic blocks for optical computing and signal processing in the MIR region.

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Tuning Contrivances of Graphene Nano-Ribbon Based Mid-Infrared Band-Pass Filter

Electrical Engineering (ICEE), Iranian Conference on ◽

10.1109/icee.2018.8472719 ◽

2018 ◽

Cited By ~ 1

Author(s):

Alireza Tavousi ◽

Mohammad Ali Mansouri-Birjandi ◽

Morteza Janfaza

Keyword(s):

Band Pass Filter ◽

Infrared Band ◽

Pass Filter ◽

Mid Infrared ◽

Band Pass

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Proposal for a graphene nanoribbon assisted mid-infrared band-stop/band-pass filter based on Bragg gratings

Optics Communications ◽

10.1016/j.optcom.2019.01.062 ◽

2019 ◽

Vol 440 ◽

pp. 75-82 ◽

Cited By ~ 11

Author(s):

Morteza Janfaza ◽

Mohammad Ali Mansouri-Birjandi ◽

Alireza Tavousi

Keyword(s):

Stop Band ◽

Bragg Gratings ◽

Graphene Nanoribbon ◽

Band Pass Filter ◽

Infrared Band ◽

Pass Filter ◽

Mid Infrared ◽

Band Pass

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Railway Track Loss-of-Stiffness Detection Using Bogie Filtered Displacement Data Measured on a Passing Train

Infrastructures ◽

10.3390/infrastructures6060093 ◽

2021 ◽

Vol 6 (6) ◽

pp. 93

Author(s):

Abdollah Malekjafarian ◽

Eugene J. OBrien ◽

Paraic Quirke ◽

Daniel Cantero ◽

Fatemeh Golpayegani

Keyword(s):

Degrees Of Freedom ◽

Inertial Sensors ◽

Field Measurements ◽

Railway Track ◽

Vertical Acceleration ◽

Band Pass Filter ◽

Pass Filter ◽

Band Pass ◽

Track Monitoring ◽

Two Populations

This paper presents an innovative numerical framework for railway track monitoring using acceleration measurements from sensors installed on a passenger train. A numerical model including a 10 degrees of freedom train passing over a three-layer track is employed. The bogie filtered displacement (BFD) is obtained from the bogie vertical acceleration using a numerical integration method and a band-pass filter. The BFD is compared to the filtered track longitudinal profile and can be seen to contain the main features of the track profile. This is also experimentally confirmed using field measurements where an in-service Irish Rail train was instrumented using inertial sensors. The proposed algorithm is employed to find the BFDs from the bogie accelerations. A track level survey was also undertaken to validate the measurements. It is shown that the BFDs from several passes are in good agreement with the surveyed profile. Finally, the BFDs are numerically used to find track defects such as hanging sleepers. The mean of the BFDs obtained from two populations of train passes over a healthy and a damaged track are employed to detect the loss of stiffness at the subgrade layer. The effect of the train forward speed variation and measurement noise are also investigated.

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