7,140 research outputs found
Magnetometer suitable for Earth field measurement based on transient atomic response
We describe the development of a simple atomic magnetometer using Rb
vapor suitable for Earth magnetic field monitoring. The magnetometer is based
on time-domain determination of the transient precession frequency of the
atomic alignment around the measured field. A sensitivity of 1.5 nT/
is demonstrated on the measurement of the Earth magnetic field in the
laboratory. We discuss the different parameters determining the magnetometer
precision and accuracy and predict a sensitivity of 30 pT/Comment: 6 pages, 5 figure
Polarization squeezing of light by single passage through an atomic vapor
We have studied relative-intensity fluctuations for a variable set of
orthogonal elliptic polarization components of a linearly polarized laser beam
traversing a resonant Rb vapor cell. Significant polarization squeezing
at the threshold level (-3dB) required for the implementation of several
continuous variables quantum protocols was observed. The extreme simplicity of
the setup, based on standard polarization components, makes it particularly
convenient for quantum information applications.Comment: Revised version. Minor changes. four pages, three figure
Universal dissipation scaling for non-equilibrium turbulence
It is experimentally shown that the non-classical high Reynolds number energy
dissipation behaviour, ,
observed during the decay of fractal square grid-generated turbulence is also
manifested in decaying turbulence originating from various regular grids. For
sufficiently high values of the global Reynolds numbers , .Comment: 5 pages, 6 figure
Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
We have numerically solved the Heisenberg-Langevin equations describing the
propagation of quantized fields through an optically thick sample of atoms. Two
orthogonal polarization components are considered for the field and the
complete Zeeman sublevel structure of the atomic transition is taken into
account. Quantum fluctuations of atomic operators are included through
appropriate Langevin forces. We have considered an incident field in a linearly
polarized coherent state (driving field) and vacuum in the perpendicular
polarization and calculated the noise spectra of the amplitude and phase
quadratures of the output field for two orthogonal polarizations. We analyze
different configurations depending on the total angular momentum of the ground
and excited atomic states. We examine the generation of squeezing for the
driving field polarization component and vacuum squeezing of the orthogonal
polarization. Entanglement of orthogonally polarized modes is predicted. Noise
spectral features specific of (Zeeman) multi-level configurations are
identified.Comment: 12 pages 9 figures. Submitted to Physical Review
On-chip integrated silicon bulk-micromachined soil moisture sensor with electronics and bus interface
This paper presents an on-chip silicon bulkmicromachined Soil Moisture Sensor (SMS) for irrigation control in greenhouses. The system-on-a-chip includes the SMS,
readout electronics, self-test, calibration facilities and a digital bus interface for external data transmission. Moreover, this
low-cost device can be applied in several locations (e. g. per each plant root), and networked together with the 1-wire bus.
The heat-pulse technique is used (for measuring the maximum temperature on a distant point) to determine the volumetric
heat capacity and hence the water content of a porous media, such as soil. In order to validate this method, experimental results were achieved with a macrosensor based on the heat-pulse and capacitance methods. The capacitance method relates the volumetric water content with the capacitance change (dielectric properties) of a probe, inserted in the soil. Several tests were performed for different type of soils and
water contents. These results are compared with the measurements achieved using the conventional thermogravimetric method
On-chip integrated silicon bulk-micromachined soil moisture sensor based on the DPHP method
This paper reports the design, modelling, fabrication and assembly of a silicon bulk-micromachined soil moisture microsensor using the Dual-Probe Heat-Pulse (DPHP)
method. Soil humidity measurement is essential to studysoil preservation and control the development of plants, namely in closed ecosystem. The DPHP method uses a heater (Peltier effect) and a temperature probe (Seebeck effect) to determine the volumetric heat capacity of the soil and hence water content ( θv). This is the first time
that the DPHP method is implemented in a microdevice and the first integrated sensor for soil moisture. This microdevice is more suited to measure at different soil depths in a non-destructive and automated manner.Agricultural and
Agro-industrial Science and Technology Institute of the
University of Trás-os-Montes and Alto Douro
A CMOS mixed-signal interface with a RF transmitter for a micromachined soil moisture sensor
This paper describes a CMOS mixed-signal interface with a RF transmitter. This die is assembled in a Multi-Chip-Module (MCM) micro-system together with the micromachined soil moisture sensor to achieve a cost effective solution with accurate and reliable measurements for soil moisture in agriculture. The soil moisture probe, based on Dual-Probe Heat-Pulse (DPHP) method, is fabricated in bulkmicromachining technology. The DPHP method is based on the measurement of the maximum temperature rise at some distance
from the heater, after applying a heat-pulse. The measurement of the temperature rise is obtained by subtracting soil temperature from the probe temperature. The mixed-signal
interface is based on a pre-amplification stage and first-order sigma-delta modulator. The bit-stream output of the modulator
is then applied to a counter as a first order decimation filter thus providing a 12-bit readout sample. Prior to transmission, data
is encoded as a pulse width modulated (PWM) signal and then transmitted by means of an amplitude shift-keying (ASK) modulation.
The transmitter features a VCO phase locked to the quartz crystal reference of 13.56 MHz to achieve a carrier frequency of 433.92 MHz. A RF power amplifier based on class
E topology was chosen. The CMOS mixed-signal interface with a RF transmitter has been implemented in a single-chip using a
standard CMOS process (AMI 0.7 µm, n-well, 2 metals and 1poly)
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