| Autor: |
Biniyam Tesfaye Taddese, Gabriele Gradoni, Franco Moglie, Thomas M Antonsen, Edward Ott, Steven M Anlage |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 15, Iss 2, p 023025 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/15/2/023025 |
| Popis: |
A sensor was developed to quantitatively measure perturbations which change the volume of a wave chaotic cavity while leaving its shape intact. The sensors work in the time domain by using either scattering fidelity of the transmitted signals or time-reversal mirrors. The sensors were tested experimentally by inducing volume changing perturbations to a 1 m ^3 mixed chaotic and regular billiard system. Perturbations that caused a volume change that is as small as 54 parts in a million were quantitatively measured. These results were obtained by using electromagnetic waves with a wavelength of about 5 cm; therefore, the sensor is sensitive to extreme sub-wavelength changes of the boundaries of a cavity. The experimental results were compared with finite difference time-domain simulation results, and good agreement was found. Furthermore, the sensor was tested using a frequency-domain approach on a numerical model of the star graph, which is a representative wave chaotic system. These results open up interesting applications such as: monitoring the spatial uniformity of the temperature of a homogeneous cavity during heating up/cooling down procedures, verifying the uniform displacement of a fluid inside a wave chaotic cavity by another fluid, etc. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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