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In this paper we talk about oscillators of optoelectronic type with intensity modulators and high-quality optical resonators technology. This subject is illustrated by an example of realization from the material to the characterization of the realized oscillator. It is explained how such an oscillator is designed and how it can be optimized.
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Citations
... Adaptive algorithms are used to detect the radiating source which is not familiar with weighted classical array of sensors [7]. The study reported that the material characterization is used to design resonator by optimization process [8]. Also, that the non-acoustic parameter needed for numerical simulation can be predicted using inverse characterisation with different algorithm for instance particle swarm optimization algorithm (PSO) [9], genetic algorithm [10] and so on. ...
... Sound absorption of multilayer configuration of hybrid foam analyzed numerically using COMSOL Multiphysics [7][8][9]. In component section, using the geometry option, a block created and the plane partitioned into 5 domains with the help of Boolean operation. ...
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.
... An example of the characterization of an optoelectronic oscillator is given in reference [28]. ...
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.
... 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. ...
Brief history of a perfect optimization with the oscillation condition and microwave tube as well as contributions to oscillators at the occasion of the centenary of a great step forward thanks to genius Heinrich Barkhausen with his pages of glory in the years 1919–1920.
