Temperature Distribution Measurement Based on ML-EM Method Using Enclosed Acoustic CT System

نویسندگان

  • Shinji Ohyama
  • Masato Mukouyama
چکیده

In this paper, a measurement method for cross-sectional temperature distributions is considered. A novel method based on an acoustic computed tomography (CT) technique is proposed. Specifically, the temperature distributions are estimated using the time of flight (TOF) of multidirectional ultrasonic propagation paths. Maximum Likelihood Expectation Maximization (ML-EM) method and the Median Filter are introduced to reconstruct the temperature distributions in a square area properly. The effectiveness of the proposed reconstruction method is confirmed experimentally. Copyright © 2013 IFSA.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Multi-objective Measurement Devices Allocation Using State Estimation in Distribution System

Allocation of measurement devices is a necessity of distribution system which is an application of state estimation. In this paper, the problem of active and reactive measurement devices is modeling using a multi-objective method. The objectives of the problem are to minimize the use of measurement devices, increase in state estimation output, improve the state estimation quality and reduce cos...

متن کامل

Generating Synthetic Computed Tomography and Synthetic Magnetic Resonance (sMR: sT1w/sT2w) Images of the Brain Using Atlas-Based Method

Introduction: Nowadays, magnetic resonance imaging (MRI) in combination with computed-tomography (CT) is increasingly being used in radiation therapy planning. MR and CT images are applied to determine the target volume and calculate dose distribution, respectively. Since the use of these two imaging modalities causes registration uncertainty and increases department w...

متن کامل

Computerized Multi Microphone Test System

An acoustic testing approach based on the concept of a microphone sensor surrounding the product under test is proposed. Partial microphone signals are processed simultaneously by a test system computer, according to the objective of the test. The spatial and frequency domain selectivity features of this method are examined. Sound-spatial visualization algorithm is observed. A test system desig...

متن کامل

Laser-Ultrasonic Monitoring of Temperature Distribution of Material Surface during Heating

A new method using laser ultrasound for monitoring temperature distribution on a material surface being heated is presented. The principle of the method is based on temperature dependence of the velocity of the surface acoustic wave (SAW) propagating on the material surface. To determine surface temperature distribution quantitatively, an effective method consisting of a SAW velocity measuremen...

متن کامل

طراحی و ساخت لوله امپدانس برای تعیین ضریب جذب صوتی برخی مصالح مورد استفاده در کنترل صدا

Introduction & Objective: Noise is one of the most important harmful agents in work environment. In spit of industrial improvements, exposure with over permissible limit of noise is counted as one of the health complication of workers. In Iran, do not exact information of the absorption coefficient of acoustic materials. Iranian manufacturer have not laboratory for measured of sound absorbanc...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2013