Optically Modulated Probe for Precision Near-Field Measurements

Memarzadeh-Tehran, Hamidreza; Laurin, Jean‐Jacques; Kashyap, Raman

doi:10.1109/tim.2010.2045552

Cited by 23 publications

(16 citation statements)

References 21 publications

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“…Removing the dependency on lumped elements may also be possible with PCB-based scatterers (e.g., printed spirals [14]). In addition, in order to explore more advanced methods of quantifying the improvement of this new scatterer design, other metrics such as modulation efficiency [10], differential radar cross section [11], etc., may be considered.…”

Section: Discussionmentioning

confidence: 99%

“…In [14], in order to maximize the MD, a printed dipole with length L of λ/10 (see Fig. 1) was centrally loaded with an optical diode that was conjugate matched (during the forward-biased state) to the input impedance of the dipole.…”

Section: Introductionmentioning

confidence: 99%

“…and the addition of matching networks to the load impedance were considered to optimize scattering and subsequently improve MD. Similarly, minimum scattering antennas have also been applied to MST [14]- [18]. In this paper, the concept of electrically invisible antennas [19]- [23] is applied to the design of MST scatterers in order to improve the MD.…”

Section: Introductionmentioning

confidence: 99%

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Application of Electrically Invisible Antennas to the Modulated Scatterer Technique

Crocker

Donnell

2015

IEEE Trans. Instrum. Meas.

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The modulated scatterer technique (MST) has shown promise for applications in microwave imaging, electric field mapping, and materials characterization. Traditionally, MST scatterers are dipoles centrally loaded with an element capable of modulation (e.g., a p-i-n diode). By modulating the load element, signals scattered from the MST scatterer are also modulated. However, due to the small size of such scatterers, it can be difficult to reliably detect the modulated signal. Increasing the modulation depth (MD; a parameter related to how well the scatterer modulates the scattered signal) may improve the detectability of the scattered signal. In an effort to improve the MD, the concept of electrically invisible antennas is applied to the design of MST scatterers. This paper presents simulations and measurements of MST scatterers that have been designed to be electrically invisible during the reverse bias state of the modulated element (a p-i-n diode in this case), while producing detectable scattering during the forward bias state (i.e., operate in an electrically visible state). The results using the new design show significant improvement to the MD of the scattered signal as compared with a traditional MST scatterer (i.e., dipole centrally loaded with a p-i-n diode). Index Terms-Dual-loaded scatterer (DLS), invisible antennas, microwave imaging, modulated scatterer technique (MST), modulation depth (MD).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Electrically Invisible Antennas to the Modulated Scatterer Technique

Crocker

Donnell

2015

IEEE Trans. Instrum. Meas.

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“…For that purpose, the transmission line from the receiving antenna to the measuring instrument is eliminated, the signal picked-up by the probe placed in the nearfield of the studied device being reradiated to a distant antenna. Very accurate results are obtained using the MST [8,9]. However, this technique is not applicable in a resonant cavity.…”

Section: Resonant Frequency Variationmentioning

confidence: 99%

Field Measurements Within a Large Resonant Cavity Based on the Perturbation Theory

Nasserdine¹,

Mengué²,

Bourcier³

et al. 2014

PIER B

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Abstract-Due to the sensitivity of the field distribution within a resonant cavity to the presence of an object, conventional measurement techniques employing a probe suffer from a limited accuracy. Therefore we propose a new measurement technique of the electric field distribution that avoids the use of a probe. Based on the perturbation theory, it consists of a measure of the cavity resonant frequency variation while displacing a small perturbing object within the cavity. The choice of the perturbing object shape, dimension and material is discussed with the help of simulation and measurement results in a canonical case. The case of reverberation chamber equipped with a mode stirrer is also considered, as well as the insertion of a metallic box within the cavity. Our measurement setup is very low-cost, simple to set up and to use, and adapted to any cavity geometry.

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“…The microwave camera [6], based on electrical modulation developed at Supelec and the optically modulated MST system developed at EPM [7], are two good examples of this principle. A preliminary investigation has shown the potential use of the planar microwave camera using a multi-view experimental platform working at a single frequency (f=2.45 GHz) [8]. Simple 2D breast phantoms were successfully reconstructed using a scalar 2D Newton-Kantorovich (N-K) reconstruction algorithm [9].…”

Section: Introductionmentioning

confidence: 99%

Towards a planar Microwave Tomography system for early stage breast cancer detection

Diaz-Bolado

Henriksson

Barrière

et al. 2011

2011 XXXth URSI General Assembly and Scientific Symposium

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In this paper, the advantages of planar Microwave Tomography (MT) applied to early stage breast cancer detection are presented. In the proposed planar configuration, the breast is compressed between two dielectric plates in a configuration similar to that of X-ray mammography. This approach would allow the future implementation of a dual modality imaging system where the advantages of both techniques can be exploited. The research efforts made both at DRÉ/L2S (Supelec) and Poly-grames (École Polytechnique de Montréal), for the development of a planar MT system are described, as well as, the key features of the latter. A numerical validation is used to show how the breast compression can lead to an enhancement of the reconstructed images.

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Optically Modulated Probe for Precision Near-Field Measurements

Cited by 23 publications

References 21 publications

Application of Electrically Invisible Antennas to the Modulated Scatterer Technique

Application of Electrically Invisible Antennas to the Modulated Scatterer Technique

Field Measurements Within a Large Resonant Cavity Based on the Perturbation Theory

Towards a planar Microwave Tomography system for early stage breast cancer detection

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