- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Scanning laser triangulation sensor geometry maintaining imaging condition
摘要： This work deals with the system design, control and the experimental results of a scanning laser sensor in which the optical path is scanned by a novel high performance compact fast steering mirror (FSM). The system design satisfies the Scheimpflug condition even though only the illumination path is scanned, such that an FSM with a small aperture size and high bandwidth can be used. To scan the area of interest with the FSM, raster trajectories are employed, which provide an uniform spatial resolution over the scan area. To track the trajectory a feedback controller is designed using the H-approach, such that a closed loop bandwidth of 1.4 kHz is achieved. The FSM can follow triangular signals up to 200 Hz with the maximum actuation range of ±3?. This enables a framerate of up to two frames per second for an image with 100x100 pixels. With the scanning system a maximum spatial resolution of 60 μm and a scan range of 25 mm can be achieved.
关键词： Optical Sensing and Sensors,Precision measurements,Laser Sensor,Fast Steering Mirror,Scheimpflug Condition,3D Sensor,Absolute measurement,System Design
更新于2025-09-16 10:30:52
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Measurement of the variation of electron-to-proton mass ratio using ultracold molecules produced from laser-cooled atoms
摘要： Experimental techniques to manipulate cold molecules have seen great development in recent years. The precision measurements of cold molecules are expected to give insights into fundamental physics. Here we use a rovibrationally pure sample of ultracold KRb molecules to improve the measurement on the stability of electron-to-proton mass ratio μ = me/Mp. The measurement is based upon a large sensitivity coefficient of the molecular spectroscopy, which utilizes a transition between a nearly degenerate pair of vibrational levels each associated with a different electronic potential. Observed limit on temporal variation of μ is 1/μ dμ/dt = (0.30 ± 1.0) × 10?14 year?1, which is better by a factor of five compared with the most stringent laboratory molecular limits to date. Further improvements should be straightforward, because our measurement was only limited by statistical errors.
关键词： cold molecules,electron-to-proton mass ratio,molecular spectroscopy,precision measurements,KRb molecules
更新于2025-09-11 14:15:04
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Observation of scalable sub-Poissonian-field lasing in a microlaser
摘要： Sub-Poisson field with much reduced fluctuations in a cavity can boost quantum precision measurements via cavity-enhanced light-matter interactions. Strong coupling between an atom and a cavity mode has been utilized to generate highly sub-Poisson fields. However, a macroscopic number of optical intracavity photons with more than 3 dB variance reduction has not been possible. Here, we report sub-Poisson field lasing in a microlaser operating with hundreds of atoms with well-regulated atom-cavity coupling and interaction time. Its photon-number variance was 4 dB below the standard quantum limit while the intracavity mean photon number scalable up to 600. The highly sub-Poisson photon statistics were not deteriorated by simultaneous interaction of a large number of atoms. Our finding suggests an effective pathway to widely scalable near-Fock-state lasing at the macroscopic scale.
关键词： microlaser,Sub-Poissonian-field lasing,cavity-enhanced light-matter interactions,quantum precision measurements,macroscopic sub-Poissonian field stabilization
更新于2025-09-11 14:15:04
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Compact Distributed Digitizers with Metrological Precision
摘要： Prototype distributed digitizers have been developed with metrological precision of the individual measurement nodes. A master controller aggregates the data of the nodes and performs all computational tasks. A crucial part of the system is the synchronization of the individual nodes at nanosecond level using white-rabbit technology. Fibre-optic communication is used to reduce interference and to obtain high isolation. When operated on battery power, this allows for special applications such as the measurement of currents in high-voltage lines. First results show that a phase difference between nodes of a few μrad can be achieved with a resolution of better than 0.1 μrad.
关键词： calibration,current transformers,measurement uncertainty,ADCs,high-voltage,wide area measurements,digitizers,power system measurements,precision measurements
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A High Precision Multi-Ratio Three-Stage Current Transformer (CT) for Loss Measurements of Extra High Voltage (EHV) Three-Phase Shunt Reactors with Test Voltages up to 1100 kV
摘要： An overview of the development and performance of special high precision multi-ratio three-stage CT and its application for loss measurement of EHV three-phase shunt reactors with AC test voltages up to 1100 kV at Royal SMIT Transformers are presented and discuss. It features current ratios of 500A/1A, 400A/1A, 300A/1A, 200A/1A, and 100A/1A with ratio errors within 3×10-6 in both magnitude and phase with burdens up to 1.0 ? and at power frequencies of 50 Hz - 60 Hz.
关键词： multi-ratio,ratio errors,multistage,Extra High Voltage (EHV),loss measurements,uncertainty,shunt reactor,three-stage,precision measurements
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Calibration of an Inductive Voltage Divider Using Pulse-Driven Josephson Arrays
摘要： We present a method for the voltage ratio calibration of inductive voltage dividers using quantum accurate pulse-driven Josephson standards. The inductive voltage divider calibration is carried out at 497 Hz with RMS amplitudes of 40 mV and 100 mV and is compared with conventional bootstrapping calibrations performed at 1 V. In these preliminary measurements, the new calibration method reached similar in-phase uncertainties as the bootstrapping method, despite the large difference in input voltages.
关键词： inductive voltage divider,Josephson standard,measurement techniques,pulse-driven Josephson arrays,precision measurements
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - N Anoscale Magnetometry Using Single Spin Quantum Sensors
摘要： Advancing the frontiers of nanoscience and information technology hinges on the availability of novel tools for nanoscale sensing and imaging. Solid-state electronic spins offer a unique platform to implement high-performance quantum sensing devices, which address this need and go beyond what classical technologies offer. We present a robust technology to realise this concept, which is based on nano-engineered diamond devices, hosting single electronic spins for sensing. We will describe the key principles underlying these novel quantum sensors and discuss some of their areas of applications which we have opened over the last years. These include the field of antiferromagnetic spintronics, where single spin magnetometry already yields unprecedented insight into domain formation and non-trivial spin-textures in antiferromagnets. Next to these room-temperature applications, we will present results of cryogenic single spin magnetometry for quantitative, high resolution imaging of vortices and supercurrents in nanoscale superconductors. These examples illustrate the remarkable performance that single spin quantum sensing offers, and which holds great promise for future applications in various applicatons of the nano-sciences.
关键词： scanning probe,spintronics,antiferromagnets,single spins,uncertainty,measurement techniques,Quantum sensing,precision measurements
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Parameterization Models for Traceable Characterization of Planar CPW SOL Calibration Standards
摘要： Methods for traceable characterization and uncertainty evaluation of planar 1-port CPW short-open-load (SOL) devices are developed. The agreement of modelling and verification measurement results greatly supports the application of the proposed parameterization models and used FEM-based EM modelling of CPW structures for traceable characterization of planar CPW-based SOL devices in the frequency range between a few kHz up to 50 GHz.
关键词： traceability,co-planar waveguide,measurement uncertainty,VNA,nanostructures,on-wafer calibration,EM simulation,precision measurements
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Thermal Gradients in the Si Lattice Parameter Measurement
摘要： We report about numerical and experimental investigations of the thermal gradients in the INRIM’s combined X-ray and optical interferometer used to measure the lattice parameter of silicon.
关键词： Si lattice parameter,Avogadro constant,precision measurements,combined X-ray and optical interferometry
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Optical Frequency Stabilization at the 10 <sup>?16</sup> Fractional Level Utilizing Ramsey-Borde Atom Interferometry
摘要： We demonstrate laser frequency stabilization at the 10-16 fractional frequency level in one second through spectroscopy on a 650 ?C calcium atomic beam. The calcium beam is interrogated with a cavity stabilized 657 nm laser arranged in a Ramsey-Borde configuration. A second laser at 431 nm reads off the final atomic state populations while allowing for high signal-to-noise. Limitations of this method are being explored and, based on current noise analysis, there is potential to achieve fractional frequency stabilities in the 10-17 range or below.
关键词： calcium,atomic clock,Measurement,stabilized laser,optical clock,Ramsey,Bordé,precision measurements,optical frequency standard
更新于2025-09-10 09:29:36