Comparative analysis of different methods of acoustic beam angle measurement and calculation of directivity patterns for angle piezoelectric transducers

2017 ◽  
Vol 53 (5) ◽  
pp. 358-361
Author(s):  
A. V. Kozlov ◽  
V. N. Kozlov ◽  
A. V. Podolskiy ◽  
I. V. Shchukin
Keyword(s):  
Comparative Analysis ◽  
Angle Measurement ◽  
Piezoelectric Transducers ◽  
Acoustic Beam ◽  
Beam Angle ◽  
Directivity Patterns

scholarly journals Comparative Analysis of 2 Methods for Radiographic Angle Measurement

Hand ◽  
2016 ◽  
Vol 11 (1_suppl) ◽  
pp. 80S-81S
Author(s):  
Juan M. Patiño ◽  
Fernando Zicovich Wilson ◽  
Ignacio M. Abdon ◽  
Sandra D. Hochbaum ◽  
Egar A. Kerber
Keyword(s):  
Comparative Analysis ◽  
Angle Measurement

Machine Vision Based Tracking Control of a Ball-Beam System

2008 ◽  
Vol 381-382 ◽  
pp. 301-304 ◽  
Author(s):  
Chao Ching Ho ◽  
C.L. Shih
Keyword(s):  
Machine Vision ◽  
Detection Algorithm ◽  
Angle Measurement ◽  
Tracking Algorithm ◽  
Frame Rate ◽  
Experimental Result ◽  
Beam Angle ◽  
Beam System ◽  
Highly Nonlinear ◽  
Balancing Control

The dynamic behavior of a ball-beam system is highly nonlinear and its characteristic is difficult to define. In this paper we present a new ball-beam balancing control system using machine vision to feedback the beam angle and ball position on the beam. Adaptive threshold based continuously mean shift vision tracking algorithm is applied to record the ball position and the beam angle with highly captured frame-rate. The proposed vision tracking algorithm is tolerant to lighting influence, highly computing efficiency and more robust than traditional template pattern matching or edge detection algorithm under non-ideal environment. The vision tracking performance is experimentally tested on a ball-beam benchmark system, where a PD controller is applied to control the motion of the ball to maintain balance. Experimental result shows that the beam angle measurement, ball tracking and balancing control of the vision feedback system are robust, accurate and highly efficient.

An Empirical Evaluation of the Duration-in-Beam Technique for Hydroacoustic Estimation

1988 ◽  
Vol 45 (7) ◽  
pp. 1244-1248 ◽  
Author(s):  
Richard E. Thorne
Keyword(s):  
Sockeye Salmon ◽  
Empirical Evaluation ◽  
Angle Measurement ◽  
Target Strength ◽  
Acoustic System ◽  
Beam Angle ◽  
Strength Parameters ◽  
Estimation Errors ◽  
System Calibration ◽  
Beam Technique

The duration-in-beam is an empirical technique for estimation of the effective sampling angle of a hydroacoustic beam. The technique potentially allows estimation of fish densities without the usual requirements for system calibration and target strength information. Duration-in-beam measurements from 50 hydroacoustic surveys of juvenile sockeye salmon (Oncorhynchus nerka) in Alaska were used to examine the variability in the technique. The results showed reasonable consistency in the beam angle measurement and indicated that the technique was not subject to the estimation errors usually associated with uncertainty in the acoustic system calibration and target strength parameters.

Sign in / Sign up

Export Citation Format

Share Document