Distributed Rayleigh scatter dynamic strain sensing above
... encompass the sensor length. Thus taking a Fourier Transform of and searching for a spectral shift using a cross correlation between measurement and reference segments of Rayleigh scatter complex spectra as done with OFDR strain sensing will not produce a useful result, except for a very small s ...
... encompass the sensor length. Thus taking a Fourier Transform of and searching for a spectral shift using a cross correlation between measurement and reference segments of Rayleigh scatter complex spectra as done with OFDR strain sensing will not produce a useful result, except for a very small s ...
optical design of an echelle grating based atomic emission
... also lacks the flexibility of changing the analytical lines at will since the slits are positioned permanently. An echelle grating based spectrometer with a charge coupled device (CCD) detector overcomes these limitations by allowing continuous recording of lines in the entire wavelength band of the ...
... also lacks the flexibility of changing the analytical lines at will since the slits are positioned permanently. An echelle grating based spectrometer with a charge coupled device (CCD) detector overcomes these limitations by allowing continuous recording of lines in the entire wavelength band of the ...
Get PDF - OSA Publishing
... delay and switching dynamics can be adjusted by selecting parameters such as waveguide coupling and choosing the frequency detuning from the gap edge. For the characteristic parameters of silica fibers [5], the peak switching power is 5 kW. Switching at lower powers can be realized in more compact p ...
... delay and switching dynamics can be adjusted by selecting parameters such as waveguide coupling and choosing the frequency detuning from the gap edge. For the characteristic parameters of silica fibers [5], the peak switching power is 5 kW. Switching at lower powers can be realized in more compact p ...
adequate designs, even though these design adequacies were
... frequently not possible to do it anyway ! Thus the procedure tended to be to "draw" the product based on experience, and if in doubt, to "over design" it. Now, however, with increased awareness and higher performance being continually demanded, this practice is no longer sufficient on its own. ...
... frequently not possible to do it anyway ! Thus the procedure tended to be to "draw" the product based on experience, and if in doubt, to "over design" it. Now, however, with increased awareness and higher performance being continually demanded, this practice is no longer sufficient on its own. ...
Advanced Applications
... Integral Feedback Controller (see page XXX for details). The controller utilizes an “error” value given by the difference between a measured process variable, produced by the spectroscopy systems, and a desired set point. Through a proportional and integral gain stage, the controller will then gener ...
... Integral Feedback Controller (see page XXX for details). The controller utilizes an “error” value given by the difference between a measured process variable, produced by the spectroscopy systems, and a desired set point. Through a proportional and integral gain stage, the controller will then gener ...
Self-rotation of resonant elliptically polarized light in collision
... structure could be neglected. It was observed that in this system, SR at high light power could not be described in terms of the third-order nonlinear susceptibility, due to saturation effects. Optical pumping was found to be an important mechanism causing SR in a resonant vapor. Until now, however, ...
... structure could be neglected. It was observed that in this system, SR at high light power could not be described in terms of the third-order nonlinear susceptibility, due to saturation effects. Optical pumping was found to be an important mechanism causing SR in a resonant vapor. Until now, however, ...
Optical amplifier
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics.There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers. In doped fibre amplifiers and bulk lasers, stimulated emission in the amplifier's gain medium causes amplification of incoming light. In semiconductor optical amplifiers (SOAs), electron-hole recombination occurs. In Raman amplifiers, Raman scattering of incoming light with phonons in the lattice of the gain medium produces photons coherent with the incoming photons. Parametric amplifiers use parametric amplification.