摘要:
A magnetometer (20) comprises a magnetic field pickup coil (22) and a magnetic field detector (26) that receives electrical signals from the pickup coil (22) and produces an electrical detector output (28) responsive thereto. The pickup coil (22) and detector (26), which are preferably made of high temperature superconductors, are enclosed in an insulated enclosure (32) having no vacuum insulation structure. Preferably, the enclosure is made of a foamed polymer material such as styrofoam. A coolant is provided to the interior of the enclosure, to cool the pickup coil and detector to a temperature below their superconducting transition temperature. A number of such modular magnetometers may be connected together to form an array.
摘要:
A plurality of magnetic flux measurement data corresponding to two dimensional grids are obtained, then the magnetic flux measurement data are convoluted to sampling unit functions in x-direction and y-direction to obtain an interpolation function. Magnetic field is illustrated by isomagnetic contour lines based on magnetic flux measurement data and interpolation values which are obtained based on the interpolation function. One of the sampling unit functions is replaced with a differential function thereof to obtain partial differential values of arbitrary points.
摘要:
The disclosure refers to a method for determining a magnetic field, comprising steps of: providing a magnetic sample (2), providing a probe (3) comprising diamond, wherein in the diamond a plurality of negatively charged nitrogen-vacancy centers are formed, scanning the probe with polarized light, wherein the probe (3) is irradiated with light emitted by a light source (4) and light reflected from the probe (3) is detected by a light detector (6), irradiating the probe (3) with polarized microwave radiation emitted by a microwave source (5) and detecting microwave radiation reflected from the probe (3) by a microwave detector (7), and evaluating the detected light and the detected microwave radiation. Also, an apparatus for determining a magnetic field is disclosed.
摘要:
Die vorliegende Erfindung betrifft einen SQUID-Sensor mit einem einzelnen Operationsverstärker, dadurch gekennzeichnet, dass ein einzelner rauscharmer Operationsverstärker verwendet wird, um auf die Weise von "open loop" ein Spannungssignal des SQUID zu verstärken, und dass ein Rückkopplungswiderstand und eine Rückkopplungsspule durch eine Ausgangsgröße, die der einzelne Operationsverstärker auf die Weise von "open loop" ausgibt, unmittelbar betrieben werden, statt eines Vorverstärkers und eines Integrators in einer herkömmlichen Flux-Locked-Loop. Die SQUID-FLL mit einem einzelnen Operationsverstärker weist zwei Verbindungsarte auf, nämlich mit dem positiven Eingang oder mit dem negativen Eingang, und die beiden Verbindungsarte haben jeweils drei Ausführungsbeispiele zu wählen. Die vorliegende Erfindung hat die Vorteile, dass die SQUID-FFL nur mit einem Operationsverstärker ausgebildet wird und hat daher eine einfache Konstruktion. Andererseits, durch den Verzicht auf den Einsatz eines Integrators in einem herkömmlichen elektrischen Kreis wird die Verzögerungszeit der Schleife verkürzt, so dass die Flux-Locked-Loop eine höhere Bandbreite besitzen kann, was für eine mehrkanälige SQUID-Anwendung von großer Bedeutung ist.
摘要:
The invention relates to a current-detection device (300) which is characterised in that it includes: a first conducting wire (306) crossed by an external current (i ext ) to be measured, said first wire creating an external magnetic field (B ext ) in its vicinity; and a magnetometric sensor (310) positioned in the vicinity of the first conductive wire, said sensor being sensitive to a flux of the external magnetic field and capable of generating a measurement signal corresponding to the external current.
摘要:
An RF DC SQUID based magnetometer capable of sensing coherent magnetic fields up to 200 MHz and higher is developed which overcomes frequency limitations associated with noise signals due to transmission line delays between the SQUID circuit and readout electronics. The bandwidth limitations are overcome by superimposing the RF flux on the modulation flux to produce at the SQUID output a binary phase modulated RF voltage, which is processed to lock the static flux, and to control modulation regime by producing an AC bias for the RF flux. RF readout electronics based on a double lock-in technique (sequential demodulation of the RF SQUID voltage at the modulation flux frequency ωm and the RF flux frequency ωRF), yields a signal proportional to the product of amplitude and phase cosine of RF flux with linear dynamic range up to five orders in magnitude if compared to DC SQUID operated in traditional flux-locked loop regime.