scholarly journals Two-wavelength phase-sensitive OTDR sensor using perfect periodic correlation codes for measurement range enhancement, noise reduction and fading compensation

2020 ◽  
Author(s):  
Alayn Loayssa ◽  
Mikel Sagues ◽  
Enrique Piñeiro ◽  
Enis Cerri ◽  
Aldo Minardo ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Measurement Range ◽  
Phase Sensitive ◽  
Periodic Correlation

scholarly journals 3-dB signal-ASE beat noise reduction of coherent multi-carrier signal utilizing phase sensitive amplification

2012 ◽  
Vol 20 (22) ◽  
pp. 24727 ◽  
Author(s):  
Takeshi Umeki ◽  
Hidehiko Takara ◽  
Yutaka Miyamoto ◽  
Masaki Asobe
Keyword(s):  
Noise Reduction ◽  
Beat Noise ◽  
Phase Sensitive ◽  
Phase Sensitive Amplification

scholarly journals Phase-sensitive optomechanical amplifier for quantum noise reduction in laser interferometers

2020 ◽  
Vol 102 (2) ◽  
Author(s):  
Yuntao Bai ◽  
Gautam Venugopalan ◽  
Kevin Kuns ◽  
Christopher Wipf ◽  
Aaron Markowitz ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Quantum Noise ◽  
Phase Sensitive ◽  
Quantum Noise Reduction ◽  
Laser Interferometers

Symmetry breaking in convergent-beam diffraction

1989 ◽  
Vol 47 ◽  
pp. 480-481
Author(s):  
D.J. Eaglesham
Keyword(s):  
Symmetry Breaking ◽  
Point Group ◽  
X Ray Diffraction ◽  
Multiple Diffraction ◽  
Space Groups ◽  
Atomic Displacements ◽  
Small Probe ◽  
Phase Sensitive ◽  
Convergent Beam

Convergent Beam Electron Diffraction is now almost routinely used in the determination of the point- and space-groups of crystalline samples. In addition to its small-probe capability, CBED is also postulated to be more sensitive than X-ray diffraction in determining crystal symmetries. Multiple diffraction is phase-sensitive, so that the distinction between centro- and non-centro-symmetric space groups should be trivial in CBED: in addition, the stronger scattering of electrons may give a general increase in sensitivity to small atomic displacements. However, the sensitivity of CBED symmetry to the crystal point group has rarely been quantified, and CBED is also subject to symmetry-breaking due to local strains and inhomogeneities. The purpose of this paper is to classify the various types of symmetry-breaking, present calculations of the sensitivity, and illustrate symmetry-breaking by surface strains.CBED symmetry determinations usually proceed by determining the diffraction group along various zone axes, and hence finding the point group. The diffraction group can be found using either the intensity distribution in the discs

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