A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:
Selected papers from the latest issue:
Numerical study of a ferrule-top cantilever optical fiber sensor for wind-tunnel applications and comparison with experimental results
22 February 2012, 21:56:07
Publication year: 2012
Source: Sensors and Actuators A: Physical, Available online 22 February 2012
A. Cipullo, G. Gruca, K. Heeck, F. De Filippis, D. Iannuzzi, ...
We present a numerical analysis of an air flow velocity sensor based on a fiber-optic ferrule-top cantilever. The device forms a low-finesse Fabry-Perot interferometer, with one of the two reflecting surfaces constituted by a cantilever beam. Under the effect of the flow pressure, the cantilever bends producing a change in the cavity length of the Fabry-Perot and therefore a modification of its optical response. The numerical analysis, performed by use of finite-element method (FEM), is then compared with a set of experimental results obtained in a small wind-tunnel.
Source: Sensors and Actuators A: Physical, Available online 22 February 2012
A. Cipullo, G. Gruca, K. Heeck, F. De Filippis, D. Iannuzzi, ...
We present a numerical analysis of an air flow velocity sensor based on a fiber-optic ferrule-top cantilever. The device forms a low-finesse Fabry-Perot interferometer, with one of the two reflecting surfaces constituted by a cantilever beam. Under the effect of the flow pressure, the cantilever bends producing a change in the cavity length of the Fabry-Perot and therefore a modification of its optical response. The numerical analysis, performed by use of finite-element method (FEM), is then compared with a set of experimental results obtained in a small wind-tunnel.
Silicon linkage with novel compliant mechanism for piezoelectric actuation of an intraocular implant
22 February 2012, 21:56:07
Publication year: 2012
Source: Sensors and Actuators A: Physical, Available online 22 February 2012
Th. Martin, U. Gengenbach, H. Guth, P. Ruther, O. Paul, ...
An implantable mechatronic microsystem is a new approach to restore the accommodation ability of the human eye. For change of refractive power a lens shift is performed by an actuator. This paper reports on the first actuator solution for such an implant. It is based on a piezoelectric bender the displacement of which has to be amplified on a very limited design space to sufficiently drive the optics of an Artificial Accommodation System. This challenge is solved by a novel compliant mechanism in single-crystal silicon that additionally ensures a linear displacement of the lens required for optical imaging quality. The design is free of any surface-friction to achieve high durability. Finite element analysis is conducted to calculate and optimize the performance of three linkage design variants. They were fabricated on a scale of 1.5:1 using deep reactive ion etching. Measurements were carried out to characterize the geometry, elastic behavior, and kinematic performance of the linkage samples. The results are in very good agreement with the calculations and indicate sufficient amplification of the piezoelectric bender's displacement by the linkage to generate the required lens shift.
Source: Sensors and Actuators A: Physical, Available online 22 February 2012
Th. Martin, U. Gengenbach, H. Guth, P. Ruther, O. Paul, ...
An implantable mechatronic microsystem is a new approach to restore the accommodation ability of the human eye. For change of refractive power a lens shift is performed by an actuator. This paper reports on the first actuator solution for such an implant. It is based on a piezoelectric bender the displacement of which has to be amplified on a very limited design space to sufficiently drive the optics of an Artificial Accommodation System. This challenge is solved by a novel compliant mechanism in single-crystal silicon that additionally ensures a linear displacement of the lens required for optical imaging quality. The design is free of any surface-friction to achieve high durability. Finite element analysis is conducted to calculate and optimize the performance of three linkage design variants. They were fabricated on a scale of 1.5:1 using deep reactive ion etching. Measurements were carried out to characterize the geometry, elastic behavior, and kinematic performance of the linkage samples. The results are in very good agreement with the calculations and indicate sufficient amplification of the piezoelectric bender's displacement by the linkage to generate the required lens shift.
Ku-band bandpass filters using novel micromachined substrate integrated waveguide structure with embedded silicon vias in benzocyclobutene dielectrics
22 February 2012, 21:56:07
Publication year: 2012
Source: Sensors and Actuators A: Physical, Available online 21 February 2012
Ik-Jae Hyeon, Woo-Young Park, Sungjoon Lim, Chang-Wook Baek
In this paper, Ku-band bandpass filters (BPFs) based on a novel micromachined substrate integrated waveguide (SIW) platform with square complementary split-ring resonators (CSRRs) have been demonstrated. The proposed SIW platform adopts embedded metal-coated silicon vias in benzocyclobutene (BCB) dielectric substrate filled into a silicon trench. Unlike conventional SIW BPFs using classical microwave substrates, the proposed BPFs can be integrated with silicon-based circuits or RF MEMS devices since the fabrication process is fully compatible with the silicon process while providing low-loss properties of the waveguide. Three types of BPFs using CPW and microstrip feeding configurations have been designed and fabricated. The microstrip-fed BPF using the same CSRRs shows an improved insertion loss of 1.39 dB at 13.8 GHz with reduced device size compared to the CPW-fed BPF which has an insertion loss of 2.27 dB at 14.1 GHz. The microstrip-fed BPF with different CSRR configurations designed to improve shape factor shows an attenuation factor of 124 dB/GHz, with an insertion loss of 2.3 dB at 21.2 GHz.
Source: Sensors and Actuators A: Physical, Available online 21 February 2012
Ik-Jae Hyeon, Woo-Young Park, Sungjoon Lim, Chang-Wook Baek
In this paper, Ku-band bandpass filters (BPFs) based on a novel micromachined substrate integrated waveguide (SIW) platform with square complementary split-ring resonators (CSRRs) have been demonstrated. The proposed SIW platform adopts embedded metal-coated silicon vias in benzocyclobutene (BCB) dielectric substrate filled into a silicon trench. Unlike conventional SIW BPFs using classical microwave substrates, the proposed BPFs can be integrated with silicon-based circuits or RF MEMS devices since the fabrication process is fully compatible with the silicon process while providing low-loss properties of the waveguide. Three types of BPFs using CPW and microstrip feeding configurations have been designed and fabricated. The microstrip-fed BPF using the same CSRRs shows an improved insertion loss of 1.39 dB at 13.8 GHz with reduced device size compared to the CPW-fed BPF which has an insertion loss of 2.27 dB at 14.1 GHz. The microstrip-fed BPF with different CSRR configurations designed to improve shape factor shows an attenuation factor of 124 dB/GHz, with an insertion loss of 2.3 dB at 21.2 GHz.
Effects of wire properties on the field-tunable behaviour of continuous-microwire composites
22 February 2012, 21:56:07
Publication year: 2012
Source: Sensors and Actuators A: Physical, Available online 21 February 2012
F.X. Qin, H.X. Peng, M.H. Phan, L.V. Panina, M. Ipatov, ...
The microwire composites consisting of continuous Co-rich amorphous glass-coated ferromagnetic microwires embedded in a E-glass prepreg matrix were fabricated, and the influences of wire periodicity (b), composition and radius on the field-tunable properties have been systematically investigated in a broad microwave frequency range of 0.9–18 GHz. It has been found that the field tunability, effective operational frequency and field of the composites are strongly dependent on these factors. With decreasingbfrom 15 to 7 mm, the field tunability of effective permittivity (nÉ›) increases from 0.77% to 16% m/A by more than 20 times. The detected cups and resonances of the transmission and reflection spectra are identified. Their changes with wire periodicity have been shown to be due to a combination of the dielectric and magnetic response arising from the interactions between microwave and microwires and microwires by themselves. The best possible field tunability occurs below the plasma frequency. The effective magnetic field for realisation of the field-tunable properties has been found to be about 500 A/m, which is associated with the anisotropy field. In addition, field tunability is found to be positively correlated with the magnetic softness and GMI properties of the wire fillers, which are determined by the wire composition and geometry. These findings are of practical importance in developing multifunctional microwire composites for a broad range of engineering applications, such as structural health monitoring, NDT and microwave tunable devices.
Source: Sensors and Actuators A: Physical, Available online 21 February 2012
F.X. Qin, H.X. Peng, M.H. Phan, L.V. Panina, M. Ipatov, ...
The microwire composites consisting of continuous Co-rich amorphous glass-coated ferromagnetic microwires embedded in a E-glass prepreg matrix were fabricated, and the influences of wire periodicity (b), composition and radius on the field-tunable properties have been systematically investigated in a broad microwave frequency range of 0.9–18 GHz. It has been found that the field tunability, effective operational frequency and field of the composites are strongly dependent on these factors. With decreasingbfrom 15 to 7 mm, the field tunability of effective permittivity (nÉ›) increases from 0.77% to 16% m/A by more than 20 times. The detected cups and resonances of the transmission and reflection spectra are identified. Their changes with wire periodicity have been shown to be due to a combination of the dielectric and magnetic response arising from the interactions between microwave and microwires and microwires by themselves. The best possible field tunability occurs below the plasma frequency. The effective magnetic field for realisation of the field-tunable properties has been found to be about 500 A/m, which is associated with the anisotropy field. In addition, field tunability is found to be positively correlated with the magnetic softness and GMI properties of the wire fillers, which are determined by the wire composition and geometry. These findings are of practical importance in developing multifunctional microwire composites for a broad range of engineering applications, such as structural health monitoring, NDT and microwave tunable devices.
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