scholarly journals Application of the Vernier method for absolute distance metrology with CW TOF phase shift technique

2020 ◽  
Vol 238 ◽  
pp. 06016
Author(s):  
Nuno M. Gonçalves ◽  
Manuel Abreu ◽  
D. Castro Alves
Keyword(s):  
Phase Shift ◽  
Phase Angle ◽  
Time Of Flight ◽  
Absolute Measurement ◽  
Absolute Distance ◽  
Position Information ◽  
Residual Part ◽  
Shift Technique

A phase shift time of flight technique determines a position by comparing the phase angle of a continuously modulated signal in the source and its reflection on a target. However, due to its cyclical properties, the position information is contained within an ambiguity interval. For an absolute measurement, this interval is repeated N times plus a residual part given by the phase shift. In this work we propose an application of the Vernier method to determine N and a setup for mid-range applications (10-20) m with a 3 GHz amplitude modulated source to allow accuracies ≤ 100 μm.

Phase Shift Technique to Improve Torque of Synchronous Reluctance Machines With Dual M-Phase Windings

2021 ◽  
pp. 1-1
Author(s):  
Wenxiang Zhao ◽  
Yuhua Sun ◽  
Jinghua Ji ◽  
Zhujin Ren ◽  
Xinxin Song
Keyword(s):  
Phase Shift ◽  
M Phase ◽  
Shift Technique

A Radio over Fiber (RoF) Based Single Sideband Modulated Passive Optical Network (PON) Using Mach Zender Modulator Based on Different Electrical Phase Shifts

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Hilal Ahmad Sheikh ◽  
Anurag Sharma
Keyword(s):  
Phase Shift ◽  
Optical Network ◽  
Phase Shifts ◽  
Radio Over Fiber ◽  
Second Order ◽  
Passive Optical Network ◽  
First Order ◽  
Single Sideband ◽  
Hybrid Coupler ◽  
Shift Technique

AbstractThis research work provides an insight on a radio over fiber (RoF) based passive optical network (RoF-PON) utilizing two diverse electrical phase shifts with optical single sideband modulation (OSSB) by exploiting Mach Zender modulator. The influence of chromatic dispersion (CD) in PONs employing single mode fiber (SMF) is a noteworthy issue and should be limited. The two techniques of OSSB modulation, in view of the two distinct angles of the hybrid coupler are employed for the design and implementation of RoF-PON. The RF signal is partitioned into two ways equally before applying it to the dual drive Mach Zender modulator input, utilizing an electrical hybrid coupler that imparts two discrete phase shifts of 90° and 120° to generate two OSSB signals individually. By utilizing traditional OSSB technique having 90° phase shift, either of the first-order sideband (lower or upper first order) suppression occurs yet second-order harmonics are still existent in the system. As opposed to this, the OSSB technique using 120° phase shift causes the suppression of either lower first order and higher second order sideband or vice versa. When contrasted to the PON based on traditional technique (90° phase shift technique), the suppression of second order sideband in PON using 120° technique lessens the system CD. Hence the PON based on 120° phase shift technique has enhanced functionality in terms of system BER, received power and power losses as compared to that with traditional OSSB technique.

Chemisorption of Ordered Overlayer on a Tight-Binding Metal Surface Two-Level Adsorbate

1982 ◽  
Vol 37 (10) ◽  
pp. 1147-1164
Author(s):  
K. Masuda
Keyword(s):  
Phase Shift ◽  
Transition Metal ◽  
Density Of States ◽  
Tight Binding ◽  
Electronic States ◽  
Bridge Site ◽  
Bonding Interaction ◽  
Model Transition ◽  
Adsorbate Structure ◽  
Shift Technique

The chemisorption of a two-level (at E1 and E2) adsorbate on the (001) surface of a tightbinding metal is investigated using the Green's function formalism and the phase shift technique. The adorbital density of states (DOS)ϱa(E) as well as the change in the electronic DOS Δϱ(E; E1, E2) due to chemisorption are calculated for the ordered overlayers with c(2 x 2), p(2 x 1), p(2 X 2), p(4 X 1) and c(4 X 2) structures. It is assumed that the chemisorbed species sit over the twofold bridge site of the (001) surface of the model transition metal and have a π-bonding interaction with the two substrate atoms. It is shown that the electronic states of the overlayers are very sensitive to the adsorbate coverage (0), adsorbate structure and adsorbate species (one level or two level adsorbates). Furthermore, it is shown that there are marked differences in the Δϱ(E) curves between the chemisorption of two level adsorbates Δϱ(E; E1, E2) and that of single level adsorbates Δϱ(E; E1) + Δϱ(E; E2) (simulating the changes in the electronic DOS during the dissociation of diatomic molecules).

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