A single channel frequency measurement scheme based on photonic compressed sampling

2021 ◽  
Author(s):  
Na Gao ◽  
Xianfeng Tang ◽  
Xiaoguang Zhang ◽  
Lixia Xi ◽  
Wenbo Zhang ◽  
...  
Keyword(s):  
Single Channel ◽  
Frequency Measurement ◽  
Compressed Sampling ◽  
Measurement Scheme

Theoretical Analysis of Instantaneous Microwave Frequency Measurement Using Microwave Phase Shift Detection

2012 ◽  
Vol 239-240 ◽  
pp. 359-362
Author(s):  
Xiao Min Zhang ◽  
Ping Cheng
Keyword(s):  
Phase Shift ◽  
Theoretical Analysis ◽  
Microwave Frequency ◽  
Frequency Measurement ◽  
Microwave Signal ◽  
Experimental Setup ◽  
Measurement Scheme ◽  
Shift Detection ◽  
Modern Warfare

In modern warfare, it is important to estimate the frequency of some unknown microwave signal. In this paper, we present a novel microwave frequency measurement scheme based on the detection of phase shift of the unknown microwave signal. We theoretically deduced the formula that could prove the feasibility of our proposal, and came up in the end of the paper with the experimental setup that could be used to consolidate our proposal.

Data Acquisition and Handling Unit for a Quantitative Use of Electron Energy Loss Spectroscopy

1977 ◽  
Vol 35 ◽  
pp. 232-233 ◽  
Author(s):  
P. Trebbia ◽  
P. Ballongue ◽  
C. Colliex
Keyword(s):  
Electron Microscope ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Single Channel ◽  
Detection System ◽  
Surface Barrier ◽  
Solid State Detector ◽  
Electrostatic Mirror ◽  
Electron Energy Loss

An effective use of electron energy loss spectroscopy for chemical characterization of selected areas in the electron microscope can only be achieved with the development of quantitative measurements capabilities.The experimental assembly, which is sketched in Fig.l, has therefore been carried out. It comprises four main elements.The analytical transmission electron microscope is a conventional microscope fitted with a Castaing and Henry dispersive unit (magnetic prism and electrostatic mirror). Recent modifications include the improvement of the vacuum in the specimen chamber (below 10-6 torr) and the adaptation of a new electrostatic mirror.The detection system, similar to the one described by Hermann et al (1), is located in a separate chamber below the fluorescent screen which visualizes the energy loss spectrum. Variable apertures select the electrons, which have lost an energy AE within an energy window smaller than 1 eV, in front of a surface barrier solid state detector RTC BPY 52 100 S.Q. The saw tooth signal delivered by a charge sensitive preamplifier (decay time of 5.10-5 S) is amplified, shaped into a gaussian profile through an active filter and counted by a single channel analyser.

Instrumentation for Measurement of Lingual Strength

1968 ◽  
Vol 11 (1) ◽  
pp. 189-193 ◽  
Author(s):  
Lois Joan Sanders
Keyword(s):  
Single Channel ◽  
Displacement Transducer ◽  
Tongue Pressure ◽  
Maximum Pressure ◽  
Research Use ◽  
Direct Writing ◽  
Significant Difference ◽  
Pressure Unit ◽  
Force Displacement ◽  
Consistent Response

A tongue pressure unit for measurement of lingual strength and patterns of tongue pressure is described. It consists of a force displacement transducer, a single channel, direct writing recording system, and a specially designed tongue pressure disk, head stabilizer, and pressure unit holder. Calibration with known weights indicated an essentially linear and consistent response. An evaluation of subject reliability in which 17 young adults were tested on two occasions revealed no significant difference in maximum pressure exerted during the two test trials. Suggestions for clinical and research use of the instrumentation are noted.

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