Instruments and Experimental Techniques最新文献_第2页

Minimization of Problems while Creating Two-Phase Flowmeters for Cryogenics and Their Features: Part I. Diagnostics of Helium Flows 最大限度地减少问题，同时创建两相流量计的低温和他们的特点：第一部分氦流的诊断

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700691

Yu. P. Filippov, A. M. Kovrizhnykh, A. Yu. Filippov

{"title":"Minimization of Problems while Creating Two-Phase Flowmeters for Cryogenics and Their Features: Part I. Diagnostics of Helium Flows","authors":"Yu. P. Filippov, A. M. Kovrizhnykh, A. Yu. Filippov","doi":"10.1134/S0020441225700691","DOIUrl":"10.1134/S0020441225700691","url":null,"abstract":"The article offers ways to create two-phase helium flowmeters in the range of mass flow rates from approximately 5–6 to more than 1000 g/s. The principle of operation of flowmeters is based on a combination of capacitive void fraction sensors with a uniform electric field inside the sensing elements to determine the average density of the two-phase mixture and conical narrowing devices to find the average flow velocity. In this case, capacitive sensors with sensitive elements of both circular and annular cross sections, which significantly differ in their sensitivity, can be used. The features and problems inherent in two-phase flowmeters of this type are considered, which include, first of all, the influence of a variety of flow patterns on the characteristics of the narrowing device. Another problem is to consider the influence of the structure of a two-phase flow on the determination of its average density. One more problem is related to possible differences between the measured values of the pressure drops in the narrowing device and the expected values, which are estimated using a homogeneous model in one of the limiting cases of a two-phase flow. The ways of minimizing these problems are shown using a combination of individual technical solutions that have already been tested in practice. Specific technical variants of two-phase helium flowmeters, including a flow-through horizontal cryostat, are presented, which are operable in the entire range of the void fractions from 0 to 1 with a relatively small total hydraulic resistance of the flowmeter’s flow part. The differences between the new and previous technical solutions are shown. The uncertainties of determining the flow rate of two-phase helium flows are estimated.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"68 3","pages":"497 - 510"},"PeriodicalIF":0.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inertial Block-Enhanced Stick-Slip Piezoelectric Actuator for Smooth Motion 用于平滑运动的惯性块增强粘滑压电驱动器

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700538

Siyuan Xing, Wanghao Shen, Aobo Sun, Hailong Tian, Jingwen Gao, Huichao Sun, Jianping Li, Fuqin Deng

{"title":"Inertial Block-Enhanced Stick-Slip Piezoelectric Actuator for Smooth Motion","authors":"Siyuan Xing, Wanghao Shen, Aobo Sun, Hailong Tian, Jingwen Gao, Huichao Sun, Jianping Li, Fuqin Deng","doi":"10.1134/S0020441225700538","DOIUrl":"10.1134/S0020441225700538","url":null,"abstract":"The stick-slip piezoelectric actuators have the disadvantage of backward motion, which reduces the efficiency of the piezoelectric actuator and triggers problems such as abrasion of the driving foot and will seriously affect the life of the actuator. In this study, a new flexible mechanism with inertial block is proposed. The structural parameters and the trajectory of the driving foot are verified by the finite element method. A prototype of the piezoelectric actuator is fabricated and various experiments on the trajectory of the driving foot and the performance of the actuator are conducted. The experimental results show that the piezoelectric actuator can achieve smooth motion with a maximum motion speed of 5.54 μm/s at f = 1 Hz and U = 100 V with symmetry 0% sawtooth wave drive, while the maximum speed can reach 1278.81 μm/s at f = 3000 Hz and U = 100 V. The piezoelectric actuator can realize a maximum horizontal load of 50 g and a maximum vertical load of 1400 g. The results show that the new flexible mechanism and its driving method proposed in this study are practicable, which can effectively reduce the sliding friction in the rapid rise period and effectively increase the static friction in the slow fall period and can achieve smooth motion with high load capacity and driving frequency. It has certain significance for the performance improvement and market application of piezoelectric actuator.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"68 3","pages":"476 - 487"},"PeriodicalIF":0.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron Linac SPRUT to Study Radiation Hardness 电子直线加速器SPRUT研究辐射硬度

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700575

N. M. Vagina, V. B. Bychkov, S. A. Andreev, V. P. Shukailo, A. E. Lyzhin, E. N. Koloskov, A. I. Negreev, D. D. Chernoskulova, E. N. Ezhov, A. V. Kuzmin

引用次数: 0

Method of Integral Counting of Particles in the Cross Section of a Beam of Uniform Radiation 均匀辐射光束截面上粒子的积分计数方法

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700563

D. D. Bogachenko, V. I. Silaev

引用次数: 0

Automatic NMR-Probe Tune System Resonatier 2.2 自动核磁共振探针调谐系统谐振器2.2

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700605

A. V. Gunbin, A. V. Tkachev, N. E. Gervits

引用次数: 0

Research Methodology of Prebreakdown Phenomena at the Cathode of a Vacuum Gap 真空间隙阴极预击穿现象的研究方法

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S002044122570068X

E. V. Nefedtsev, S. A. Onischenko, P. P. Kiziridi, E. V. Yakovlev, S. G. Anikeev

引用次数: 0

The Power Measurement Peculiarities of the Orotrons of the Wave Length 2-mm Region 波长2-mm区域的光控功率测量特性

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700678

E. A. Myasin, A. Yu. Il’in, N. A. Maksimov

引用次数: 0

Method for Determining the Magnetic Field Distribution Map in the Gap of an Axisymmetric Laboratory Electromagnet 轴对称实验室电磁铁间隙磁场分布图的确定方法

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700599

V. N. Glazkov, D. A. Malinitskii, A. Kh. Ryazhapov

引用次数: 0

An Embedded Controller for Devices at the SKIF Accelerator Complex SKIF加速器综合体设备的嵌入式控制器

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700666

D. A. Lipovyy, D. V. Senkov, P. B. Cheblakov, A. V. Gerasev, S. E. Karnaev

引用次数: 0

Assessing the Interplay between Probe Power and Pulse Width in Enhancing Performance of Phase-OTDR Fiber Sensor 提高相位otdr光纤传感器性能中探头功率和脉宽的相互作用评估

IF 0.4 4区工程技术

Instruments and Experimental Techniques Pub Date : 2025-09-24 DOI: 10.1134/S0020441225700502

Ain Nabihah Mohammad Rihan, Suhairi Saharudin, Mohd Hafizulfika Hisham, Muhammad Muhsin Kalilur Raheem, Mohd Saiful Dzulkefly Zan

{"title":"Assessing the Interplay between Probe Power and Pulse Width in Enhancing Performance of Phase-OTDR Fiber Sensor","authors":"Ain Nabihah Mohammad Rihan, Suhairi Saharudin, Mohd Hafizulfika Hisham, Muhammad Muhsin Kalilur Raheem, Mohd Saiful Dzulkefly Zan","doi":"10.1134/S0020441225700502","DOIUrl":"10.1134/S0020441225700502","url":null,"abstract":"We discuss the performance of the distributed fiber optic sensor (DFOS) interrogation unit based on the phase-optical time domain reflectometry (ϕ-OTDR) principle. This experiment focuses on improving the performance of ϕ-OTDR by controlling two selective parameters: probe power and laser pulse width. These parameters were chosen due to their significant impact on the signal-to-noise ratio (SNR), which directly influences the sensitivity and accuracy of the system. Two experiments were conducted using 10 and 40 km standard ITU-T G.652D telecom grade bare fiber optic connected to the ϕ-OTDR setup. For each experiment, two sets of probe laser parameters (launched optical power and pulse width) were varied, and the SNR was calculated as an indicator of performance. An SNR of 13.99 dB was achieved from a 10 km ϕ-OTDR setup with a pulse width of 300 ns (launched optical power fixed at 100 mW). With launched optical power fixed at 100 mW, an SNR of 12.76 dB was obtained from a 40 km ϕ-OTDR setup when the pulse width was set to 500 ns. Data analysis revealed that SNR values in both ϕ-OTDR setups (10 and 40 km) approached saturation as the probe power launched and optical power increased. This study highlights that the best signal performance can be achieved by carefully optimizing these selective parameters, as their interplay determines the balance between spatial resolution and signal strength in the ϕ-OTDR system.","PeriodicalId":587,"journal":{"name":"Instruments and Experimental Techniques","volume":"68 3","pages":"414 - 426"},"PeriodicalIF":0.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0