- 标题
- 摘要
- 关键词
- 实验方案
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Frequency Extension of Atomic Measurement of Microwave Strength Using Zeeman Effect
摘要： Measuring the field strength of an electromagnetic wave based on atomic quantum mechanics is expected to be an innovative method to realize stable and reliable measurements. However, the major issue of atomic measurements is that the measurable frequency is limited to the resonant frequency of atoms. Therefore, in this paper, we demonstrate the measurement at arbitrary frequencies using the Zeeman effect in a static magnetic field. A cesium vapor cell is placed in a static magnetic field of approximately 40 mT, which causes the resonant frequency of the cesium atom to shift from 9.2 to 8.2 GHz. In addition, the Rabi frequency due to the interaction between cesium atoms and microwaves is measured at the frequency of 8.2 GHz in this experiment.
关键词： frequency measurement,microwave measurements,metrology,microwave spectroscopy,electromagnetic measurements,Atom optics,atomic measurements,measurement standards
更新于2025-09-23 15:22:29
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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) - Real-Time Confocal Fluorescence Lifetime Imaging Microscopy (FLIM) for Spectroscopic Sensing of Cancer Tissues
摘要： We demonstrated GPU accelerated real-time confocal fluorescence lifetime imaging microscopy (FLIM) based on the analog mean-delay (AMD) method. The frame rate of our system was demonstrated to be 13 fps for a 200 × 200 pixel image when observing maize vascular tissue. This system can be utilized for studying spectroscopic characteristics of cancer tissues.
关键词： measurement standards,measurement uncertainty,uncertainty,measurement techniques,Measurement,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) - Low-Noise Measurement Setup for Single-Electron Pumps
摘要： Single-electron pumps (SEPs) applied as quantum current sources are a fundamental part of a future quantum triangle experiment. To characterize an SEP in a reasonably short time, a low-noise setup is needed. We present an improved measurement setup tailored for current measurements on SEP, characterized by a low-noise wiring and a new variant of the ultrastable low-noise current amplier (ULCA). The evaluation shows that the setup is suitable for measuring a 100 pA current with a relative uncertainty of 0.1 μA/A within about 14 hours.
关键词： Current measurement,measurement uncertainty,noise measurement,measurement standards,low-noise amplifiers
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) - SIM Key Comparison of S-Parameters SIM.EM.RF-K5b.CL
摘要： The first RF key comparison within the Inter-American Metrology System (SIM) Regional Metrology Organization has been carried out. The purpose of it was to establish the degree of equivalence of scattering parameters measurements of both 1-port and 2-port coaxial devices among national metrology institutes (NMIs) that belong to SIM region and in support of CIPM Mutual Recognition Agreement (MRA). The travelling standards were four devices with Type-N coaxial connectors and 50 ? of characteristic impedance: a matched load, a mismatched load and two attenuators of 3 dB and 20 dB. Four SIM institutes participated in the comparison as well as NPLI.
关键词： measurement standards,measurement uncertainty,measurement techniques,Measurement,radio frequency,precision measurements,scattering parameters
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Harmonic Power Standard of VTT MIKES
摘要： This paper describes the new single-phase harmonic power standard of VTT MIKES. The standard is based on a custom digitizer, which is developed for AC metrology in the laboratory, and for field measurement campaigns. Test signal generation uses a dual channel arbitrary function generator, a voltage amplifier, and a transconductance amplifier. Reference voltage and current measurements are respectively based on a capacitive-resistive voltage divider and two different types of resistive shunt designs.
关键词： power measurement,measurement uncertainty,measurement standards,Measurement
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) - Towards a BIPM On-Site Comparison Program for AC Voltages Based on the Differential Sampling Technique
摘要： BIPM has conducted a few pilot studies to investigate the possibility of extending the protocol of the BIPM program of on-site DC Josephson Voltage Standard comparisons (BIPM.EM-K10.b) to AC voltages. On-site indirect comparisons have been performed for AC low frequency sinewaves, at 1 V and 6.5 V rms, using the new BIPM Programmable Josephson Voltage Standard and the differential sampling method. A relative agreement within a few parts in 107 can typically be achieved using a commercial calibrator as a transfer standard. The noise of the phase locking process appears to be the limiting factor. We have been investigating other AC generators as possible candidates for an accurate transfer standard.
关键词： On-site-comparison,Programmable Josephson Voltage Standards,AC voltage measurement standards,Differential Sampling
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) - On the Development of an AC-Quantum Voltmeter
摘要： This paper presents an AC-Quantum voltmeter based on a 1 V programmable Josephson array, a purpose-built sigma-delta digitizer, a clock generator and a custom AC bias source. The highlights of this system are brie?y described and supported by preliminary measurements.
关键词： measurement techniques,voltage measurement,voltmeters,measurement standards,Analog-digital conversion
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 AC Shunts at Frequencies Up to 10 kHz Using Digital Sampling
摘要： This paper describes a calibration system for AC shunts using digital sampling. It provides both ratio errors and phase displacements of a shunt under test with respect to a reference shunt. In its basic configuration, the calibration system operates at currents of up to 10 A and frequencies of up to 10 kHz. The expanded uncertainties (k = 2) of the described calibration system are estimated to be better than 30 μA/A for magnitude and 30 μrad for phase at 10 kHz, and lower than these at lower frequencies.
关键词： calibration,calculable resistor,current comparator,current measurement,measurement uncertainty,AC shunt,measurement standards
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) - Progress on a New Measurement of von Klitzing Constant at NIM
摘要： This paper describes the progress on a new measurement of von Klitzing constant (Rk) through an experiment linking the new calculable capacitor and the quantized Hall resistance by means of a quadrature transfer at NIM. The recent improvements of the new calculable capacitor, the optical interferometry, the impedance measurement chain are presented.
关键词： von Klitzing constant,optical interferometry,bridge circuits,Calculable capacitor,impedance measurement,measurement standards
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) - Purpose-Built Air Bath for use with NMIA Calculable Cross-Capacitor Measurement Chain
摘要： This paper describes the design of an air bath for maintaining the reference capacitors associated with the new NMIA calculable cross-capacitor measurement system. The air bath is designed to maintain a set temperature in the range 15 °C to 25 °C with a stability of 0.1 mK over the short time periods during which the capacitors are measured.
关键词： temperature control,Capacitance measurement,precision measurements,measurement standards
更新于2025-09-10 09:29:36