Feasibility Study on Non-contact Measurement Method for Primary Support of Tunnel

2021 ◽  
Vol 7 (3) ◽  
Author(s):  
Zheng Wei ◽  
Zhengxiang Ding ◽  
Zhen Zhou ◽  
Yiliang Huang
Keyword(s):  
Feasibility Study ◽  
Measurement Method ◽  
Contact Measurement ◽  
Primary Support

Research of the Measurement System of Liquid Displacement Based on Angular Tracking

2010 ◽  
Vol 20-23 ◽  
pp. 493-498
Author(s):  
Huan Qi Tao ◽  
Shuang Bao Ma
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Laser Light ◽  
Angular Displacement ◽  
Actual Data ◽  
Liquid Level ◽  
Light Reflection ◽  
Contact Measurement ◽  
Displacement Based ◽  
Liquid Displacement

This paper introduces a kind of measurement method of the height of liquid level by the tracking the use of angular displacement, aiming at the difficulties and problems of non-contact measurement for the height of liquid level in ultrasonic. Under the principle of the simultaneous tracking and laser light reflection, it realize the corresponding relationship between the liquid displacement and the light imaging based on the triangulation method. Thus to obtain the actual data of the height of liquid level. That to offer another new option for non-contact measurement.

scholarly journals Non-contact PIM Measurement Method for Antenna using High-level IM Standard

2021 ◽  
Author(s):  
Masayoshi Kuwata ◽  
Nobuhiro kuga
Keyword(s):  
Schottky Barrier ◽  
Measurement Method ◽  
Dipole Antenna ◽  
Intermodulation Distortion ◽  
Coupling Loss ◽  
Contact Measurement ◽  
Novel Method ◽  
Three Stages ◽  
High Level ◽  
Excellent Stability

<p>A non-contact passive intermodulation distortion (PIM) measurement method for antenna using high-level IM standard (HIMS) is described as proposed herein. A novel method to estimate coupling loss between sensing antenna and a sample antenna is proposed, after which a complete one-port non-contact measurement for antenna is realized. Measurements are conducted in three stages: measuring IM characteristics of HIMS, estimating coupling loss using HIMS, and estimating practical PIM level of a sample antenna. A high-level IM standard consisting of a Schottky barrier diode was used for this study. The method enables ready evaluation of practical PIM of a sample antenna from a complete one-port non-contact measurement with excellent stability and repeatability. Then the validity of the proposed method was confirmed experimentally using a printed dipole antenna. After presenting an applicable measurement method for array antenna incorporating the proposed method, its effectiveness was verified experimentally.</p>

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