806 research outputs found
Model of a microtoroidal magnetometer
We present a model of a cavity optomechanical magnetic field sensor based on a microtoroidal resonator. The magnetic field induced expansion of a magnetostrictive material is transduced onto the physical structure of a highly compliant optical microresonator. The resulting motion is read out optically with ultra-high sensitivity. According to our theoretical model sensitivities of up to 750 fT/â Hz may be possible. The simultaneous presence of high-quality mechanical and optical resonances in microtoroids greatly enhances both the response to the magnetic field and the measurement sensitivity
Cavity Optomechanical Magnetometer
A cavity optomechanical magnetometer is demonstrated where the magnetic field
induced expansion of a magnetostrictive material is transduced onto the
physical structure of a highly compliant optical microresonator. The resulting
motion is read out optically with ultra-high sensitivity. Detecting the
magnetostrictive deformation of Terfenol-D with a toroidal whispering gallery
mode (TWGM) resonator a peak sensitivity of 400 nT/Hz^.5 was achieved with
theoretical modelling predicting that sensitivities of up to 500 fT/Hz^.5 may
be possible. This chip-based magnetometer combines high-sensitivity and large
dynamic range with small size and room temperature operation
Sensitivity of cavity optomechanical field sensors
This article presents a technique for modeling cavity optomechanical field sensors. A magnetic or electric field induces a spatially varying strain across the sensor. The effect of this strain is accounted for by separating the mechanical motion of the sensor into eigenmodes, each modeled by a simple harmonic oscillator. The force induced on each oscillator can then be determined from an overlap integral between strain and the corresponding eigenmode, with the optomechanical coupling strength determining the ultimate resolution with which this force can be detected
A Place to Call Home: Amphibian Use of Created and Restored Wetlands
Loss and degradation of wetland habitats are major contributing factors to the global decline of amphibians. Creation and restoration of wetlands could be a valuable tool for increasing local amphibian species richness and abundance. We synthesized the peer-reviewed literature addressing amphibian use of created and restored wetlands, focusing on aquatic habitat, upland habitat, and wetland connectivity and configuration. Amphibian species richness or abundance at created and restored wetlands was either similar to or greater than reference wetlands in 89% of studies. Use of created and restored wetlands by individual species was driven by aquatic and terrestrial habitat preferences, as well as ability to disperse from source wetlands. We conclude that creating and restoring wetlands can be valuable tools for amphibian conservation. However, the ecological needs and preferences of target species must be considered to maximize the potential for successful colonization and long-term persistence
Determination of the stellar (n,gamma) cross section of 40Ca with accelerator mass spectrometry
The stellar (n,gamma) cross section of 40Ca at kT=25 keV has been measured
with a combination of the activation technique and accelerator mass
spectrometry (AMS). This combination is required when direct off-line counting
of the produced activity is compromised by the long half-life and/or missing
gamma-ray transitions. The neutron activations were performed at the Karlsruhe
Van de Graaff accelerator using the quasistellar neutron spectrum of kT=25 keV
produced by the 7Li(p,n)7Be reaction. The subsequent AMS measurements were
carried out at the Vienna Environmental Research Accelerator (VERA) with a 3 MV
tandem accelerator. The doubly magic 40Ca is a bottle-neck isotope in
incomplete silicon burning, and its neutron capture cross section determines
the amount of leakage, thus impacting on the eventual production of iron group
elements. Because of its high abundance, 40Ca can also play a secondary role as
"neutron poison" for the s-process. Previous determinations of this value at
stellar energies were based on time-of-flight measurements. Our method uses an
independent approach, and yields for the Maxwellian-averaged cross section at
kT=30 keV a value of 30 keV= 5.73+/-0.34 mb.Comment: 8 pages, 3 figure
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