The lock-in CCD-two-dimensional synchronous detection of light

1995 ◽  
Vol 31 (9) ◽  
pp. 1705-1708 ◽  
Author(s):  
T. Spirig ◽  
P. Seitz ◽  
O. Vietze ◽  
F. Heitger
Keyword(s):  
Two Dimensional ◽  
Synchronous Detection ◽  
Lock In

1113 Fluid Force Acting on Two-Dimensional Circular Cylinder in Lock-in Phenomenon

2001 ◽  
Vol 2001.38 (0) ◽  
pp. 357-358
Author(s):  
Shiki OKAMOTO ◽  
Yoshihiko TAGUWA ◽  
Ryosuke UEMATSU
Keyword(s):  
Circular Cylinder ◽  
Two Dimensional ◽  
Fluid Force ◽  
Lock In

Numerical Solution for Laminar Two Dimensional Flow About a Cylinder Oscillating in a Uniform Stream

1982 ◽  
Vol 104 (2) ◽  
pp. 214-220 ◽  
Author(s):  
S. E. Hurlbut ◽  
M. L. Spaulding ◽  
F. M. White
Keyword(s):  
Reynolds Numbers ◽  
Quantitative Agreement ◽  
Two Dimensional ◽  
Inertia Effects ◽  
Dimensional Flow ◽  
Two Dimensional Flow ◽  
Vortex Shedding Frequency ◽  
Shedding Frequency ◽  
Lock In ◽  
Uniform Stream

A finite difference model is presented for viscous two dimensional flow of a uniform stream past an oscillating cylinder. A noninertial coordinate transformation is used so that the grid mesh remains fixed relative to the accelerating cylinder. Three types of cylinder motion are considered: oscillation in a still fluid, oscillation parallel to a moving stream, and oscillation transverse to a moving stream. Computations are made for Reynolds numbers between 1 and 100 and amplitude-to-diameter ratios from 0.1 to 2.0. The computed results correctly predict the lock-in or wake-capture phenomenon which occurs when cylinder oscillation is near the natural vortex shedding frequency. Drag, lift, and inertia effects are extracted from the numerical results. Detailed computations at a Reynolds number of 80 are shown to be in quantitative agreement with available experimental data for oscillating cylinders.

scholarly journals Регистрация спектров инфракрасной фотолюминесценции методом стробируемого интегрирования в режиме активного вычитания фонового сигнала

2020 ◽  
Vol 128 (1) ◽  
pp. 134
Author(s):  
А.И. Луферов ◽  
Д.Д. Фирсов ◽  
О.С. Комков
Keyword(s):  
Duty Cycle ◽  
Integration Method ◽  
Signal To Noise Ratio ◽  
Synchronous Detection ◽  
Semiconductor Structures ◽  
Low Duty Cycle ◽  
Ftir Spectrometer ◽  
The Fourier Transform ◽  
Low Dimensional ◽  
Lock In

A method based on the Fourier-transform infrared (FTIR) spectrometer has been implemented allowing infrared photoluminescence measurements with a low duty cycle of pump pulses. It reduces the uncontrolled heating of semiconductor structures by pump laser. The method was used to record the infrared photoluminescence spectra of test narrow-gap low dimensional heterostructures in the wavelength range of 1–5 μm. It was determined that for large reverse duty cycle (more then 20) the developed gated integration method has a better signal-to-noise ratio in the measured spectra compared to the traditionally used synchronous detection method (Lock-in amplification).

scholarly journals Fluid Force Acting on Two-Dimensional Circular Cylinder Row in Lock-in Condition

2008 ◽  
Vol 74 (745) ◽  
pp. 1920-1927
Author(s):  
Shiki OKAMOTO ◽  
Shun ABE ◽  
Jun TEZUKA ◽  
Shunsuke NOTANI
Keyword(s):  
Circular Cylinder ◽  
Two Dimensional ◽  
Fluid Force ◽  
Lock In
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