An example of design, optimization, stabilization and noise performances of resonator-based optoelectronic oscillators

New acoustic multilayer absorber fabricated by coupling closed-cell metallic foam and open-cell polymeric foam, which aimed to develop a practical use of metallic foam in the noise control application. In prior, the individual sound absorption coefficient of both foam materials with different thicknesses measured by the impedance tube method as per ASTM E-1050. Using inverse characterization technique, the intrinsic properties needed for five parameter models in a numerical study are predicted. The measured characteristic impedance, complex wave propagation, and sound absorption coefficient of the individual foams are in close agreement with the prediction. Subsequently, a different configuration of multilayer absorber is modeled using obtained properties, and their acoustic performance is evaluated. The result indicates that the coupling of polymeric foam with metallic one exhibits enhanced sound absorption and usage of closed-cell metallic foam in noise control material. Furthermore, the result demonstrates that absorption capability entirely relies on the placement of polymeric foam in the configuration. The proposed hybrid multilayer absorber coupled with test bench car for interior acoustic study, where 5–30 dB is reduction is noticed in 1/3rd octave plot.

Section: Numerical Simulation 261 Multilayer Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and simulation of multilayer hybrid foam material for acoustic application

Yuvaraj¹,

Jeyanthi

Chinnapandi

et al. 2021

“…Every researcher and engineer who works on oscillators knows that it is essential to meet the Barkhausen criteria before being able to start an oscillator. An example is given through these references corresponding to work on crystal oscillators and other types of optoelectronic oscillators [2][3][4][5][6]. This does not guarantee that the oscillator will be stable and that the oscillation will continue, but it is an essential part.…”

Section: Heinrich Barkhausen's Main Contributions To Oscillatorsmentioning

confidence: 99%

Celebration of the centenary of a major scientific milestone thanks to Heinrich Barkhausen

Salzenstein

Pavlyuchenko

2020

Self Cite

Frequency and temperature control for complex system engineering in optoelectronics and electronics: an overview

Salzenstein

2020

Self Cite

To take advantage of the physical principles of determining parameters, such as frequency stability, noise and also alignment of optical signals, it is necessary to control complex systems. This work allows explaining it through various concrete cases such as the determination of phase noise of microwave oscillators, the control of the temperature of the manufacturing process of optical components. We also discuss the estimation of the uncertainty associated with the measurement results, as it is fundamental to control the error range.