- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Defects and Improvements of Pockels Transducer Voltage Segmentation
摘要： The sensing range and sensitivity of optical voltage transducer are badly limited by the inherent half-wave voltage of the electro-optic crystals and a nonlinear polarization demodulation based on Malus’ law. A multi-segmented structure can meet the requirement of the half-wave voltage but is only suitable for 500 kV and above voltage levels with incident wavelength of 632.8 nm, but it is not suitable for all voltage levels if the incident wavelength is greater than 1330 nm. By the way in the multi-segmented structure its optical path and devices are deviated easily by vibrations and thermal expansion and contraction. In this paper, the multi-segmented structure is improved to be suitable for various high-voltage levels with the wavelength of 632.8 nm or greater, and moreover, a new approach is presented to use MgTiO3 ceramics to enwrap around BGO (Bi4Ge3O12) crystal to reduce the integral voltage errors from 0.260% to 0.012%.
关键词： high voltage measurement,Optical voltage transducer,multi-segmented structure,integral voltage error
更新于2025-09-23 15:22:29
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An Optoelectronic Pulse Drive for Quantum Voltage Synthesizer
摘要： An optoelectronic pulse drive system based on commercially available telecoms optoelectronic components and a field-programmable gate array has been developed. In order to allow the use of ac-coupled optoelectronic components, a method of adding and subtracting complementary pulses was developed. The system was used to drive a Josephson junction array to synthesize quantum-accurate voltage waveforms. These waveforms will be used in voltage waveform metrology applications. Results from the synthesis of sinusoidal unipolar voltage waveforms from 3 to 300 kHz are presented. The margin of operation was measured and shown to require an optical pulse height stability better than 0.15 mW. The use of delta–sigma code with repeated sections, suitable for a quantum voltage digitizer was also examined. A test code corresponding to a delta–sigma feedback loop rate of 250 MHz was used to synthesize a 3.125 kHz sinusoidal waveform.
关键词： Josephson arbitrary waveform synthesizer,optoelectronics,metrology,Josephson arrays,measurement,voltage measurement
更新于2025-09-23 15:21:21
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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 Wideband Phase Measurement System with a Differential TVC Based on the Three-Voltmeter Method
摘要： This paper describes a phase measurement system based on the three-voltmeter method. The measurement system replaces three voltmeters with three thermal voltage convertors including a differential AC/DC difference measurement in which the 4-wire switching mode in the multiplexer is applied. The measurement method by the single-ended TVC outputs and differential TVC output is introduced in the phase measurement system. The details and problems on the measurement system are described and discussed.
关键词： error,voltage measurement,Three-voltmeter method,phase measurement,thermal voltage convertor
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) - A Sampling Wattmeter with Extended Frequency Range
摘要： This paper describes the implementation of a sampling wattmeter for the measurement of sinusoidal active and reactive power over the 50 Hz to 6 kHz frequency range, 20 V to 600 V voltage range, and 0.05 A to 80 A current range. The wattmeter is capable of measuring sinusoidal and distorted voltage and current signals with up to 100 harmonics of the fundamental frequency component. Details of the system design, measurement techniques, and signi?cant sources of error are presented.
关键词： power measurement,digital-analog conversion,current measurement,signal synthesis,voltage measurement,permuting capacitance,Analog-digital conversion,quantization
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) - Calibrating a Voltmeter with a PJVS Using a DAC as a Real-Time Calibrated Transfer Standard
摘要： A Programmable Josephson Voltage Standard (PJVS) has been used to calibrate a voltmeter by measuring the difference between a Digital to Analog Converter (DAC) and a step-wise approximated sine wave from a PJVS with a difference amplifier (DA). The characterization of two different DAs was used to determine the accuracy in transferring the PJVS value to the voltmeter, operating the DAC as a real-time calibrated transfer standard with an uncertainty of a few μV/V.
关键词： PJVS,difference voltage,voltage measurement,ADC,DAC
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) - Progress on AC Voltage Measurement System with Josephson Voltage Standard
摘要： This paper describes the new progress on ac voltage measurement system with Josephson voltage standard at NIM. A low-noise differential voltage preamplifier is placed in front of a single-ended sampling ADC in order to increase common-mode rejection and minimize interference from ground loop currents, and a new type of sine fit algorithm is used to enhance the data processing accuracy and reliability of the differential sampling system. The experimental results show the feasibility of current system.
关键词： ac programmable Josephson voltage standard,ac voltage measurement,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 (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - An Optoelectronic Pulse Drive for Quantum Voltage Synthesizer
摘要： An optoelectronic pulse drive system based on commercially available telecoms optoelectronic components and a field programmable gate array (FPGA) has been developed. The system was used to drive a Josephson junction array (JJA) to synthesize quantum-accurate voltage waveforms. Results from preliminary demonstration of the system are presented showing the synthesis of a 3.1 kHz sine wave.
关键词： Josephson arbitrary waveform synthesizer,opto-electronics,metrology,voltage measurement,Measurement,Josephson arrays
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) - Three Volt Pulse-Driven Josephson Arbitrary Waveform Synthesizer
摘要： We describe a new generation of Josephson Arbitrary Waveform Synthesizers that generate programmable ac waveforms with an rms amplitude of 3 V and, at 1 kHz, have a quantum locking range greater than 1 mA. This system has two chips with a total of 204 960 Josephson junctions (JJs) co-located on a cryocooler. To test for systematic errors, we phase-shift by 180° the waveform generated by half the JJs (102 480 JJs) to produce an approximate null. The measured residual of 51 nV rms implies a relative agreement of 3 parts in 108 between the two halves of the system.
关键词： Digital-analog conversion,signal synthesis,voltage measurement,superconducting integrated circuits,Josephson junction arrays,measurement standards
更新于2025-09-10 09:29:36