scholarly journals Selection of the tagged photons by off axis heterodyne holography in ultrasound-modulated optical tomography

2017 ◽  
Vol 56 (7) ◽  
pp. 1846 ◽  
Author(s):  
M. Gross
Keyword(s):  
Optical Tomography ◽  
Tagged Photons ◽  
Selection Of

scholarly journals Photorefractive detection of tagged photons in ultrasound modulated optical tomography of thick biological tissues

2004 ◽  
Vol 12 (22) ◽  
pp. 5469 ◽  
Author(s):  
F. Ramaz ◽  
B. C. Forget ◽  
M. Atlan ◽  
A. C. Boccara ◽  
M. Gross ◽  
...  
Keyword(s):  
Optical Tomography ◽  
Biological Tissues ◽  
Tagged Photons

scholarly journals Improvement of absorption and scattering discrimination by selection of sensitive points on temporal profile in diffuse optical tomography

2011 ◽  
Vol 19 (13) ◽  
pp. 12843 ◽  
Author(s):  
Farouk Nouizi ◽  
Murielle Torregrossa ◽  
Renee Chabrier ◽  
Patrick Poulet
Keyword(s):  
Optical Tomography ◽  
Diffuse Optical Tomography ◽  
Temporal Profile ◽  
Selection Of

Optimal selection of frequencies for Diffuse Optical Tomography

2000 ◽  
Author(s):  
Vasilis Ntziachristos ◽  
Joe Culver ◽  
Monica Holboke ◽  
A.G. Yodh ◽  
Britton Chance
Keyword(s):  
Optical Tomography ◽  
Diffuse Optical Tomography ◽  
Optimal Selection ◽  
Selection Of

Optical Tomography: Transmitter And Receiver Circuit Preparation

2012 ◽  
Author(s):  
Siti Zarina Mohd Muji ◽  
Ruzairi Abdul Rahim ◽  
David A.Johnson ◽  
Mohd Hafiz Fazalul Rahiman ◽  
Elmy Johana Mohamad ◽  
...  
Keyword(s):  
Key Words ◽  
Operational Amplifier ◽  
Optical Tomography ◽  
Selection Of

Kertas kerja ini memfokuskan faktor yang memberi kesan kepada pemilihan penghantar dan penerima dan bahagian–bahagian lain untuk persediaan bagi litar optikal tomografi. Perbincangan major adalah pemilihan sensor penghantar dan penerima, operational amplifier dan penyusunan komponen di dalam litar. Kertas kerja ini menyediakan panduan tentang bagaimana untuk memilih komponen yang sesuai dan menyusunnya untuk membina litar yang baik dan berfungsi. Kata kunci: Penghantar; penerima; penguat pengoperasian; tomografi optik This paper focuses on the factors that need to be considered while making the decision for transmitter, receiver and other parts that are needed in the preparation for the optical tomography circuit. The major discussion is on the selection of transmitter and receiver’s sensor, operational amplifier, and the arrangement of components in the circuit. This paper provides guidance on how to select the appropriate component and rearrange them to construct a good and functional circuit. Key words: Transmitter; receiver; operational amplifier; optical tomography

Front End Development Of Optical Tomography And Its Linearity

2012 ◽  
Author(s):  
Siti Zarina Mohd Muji ◽  
Yusri Md Yunos ◽  
Ruzairi Abdul Rahim ◽  
Mohd Hafiz Fazalul Rahiman
Keyword(s):  
Linear Relation ◽  
Optical Tomography ◽  
Light Path ◽  
Receiver Side ◽  
Tomography System ◽  
Front End ◽  
Voltage Loss ◽  
First Impression ◽  
Circuit Development ◽  
Selection Of

Pembangunan bahagian hadapan adalah penting di dalam tomografi optikal. Ia memberikan pandangan pertama tentang bagaimana kebolehpercayaan sistem tomografi kepada pengukurannya. Oleh itu, litar penghantar dan penerima mesti dibina berhati-hati dengan analisis yang baik untuk setiap pemilihan unit komponennya. Kertas kerja ini akan menunjukkan kesan pembangunan litar kepada mutu kelinearannya. Tujuan kertas kerja ini adalah untuk membina litar penghantar dan penerima untuk aplikasi tomografi optikal. Ia dilakukan dengan mendapatkan unit voltan pada bahagian penerima setelah bertindak balas terhadap kewujudan penghalang yang mengganggu laluan cahaya di antara penghantar dan penerima. Reka bentuk eksperimen ini menggunakan penghalang dari jenis yang sama dengan perbezaan saiz di antara 0.5 hingga 3 mm. Daripada keputusan ia menunjukkan lebih besar objek, nilai bagi kehilangan voltan juga akan meningkat. Ini menunjukkan hubungan yang linear di antara kedua-dua parameter. Kata kunci: Tomografi optikal penghantar; penerima; litar; kelinearan Front end development is crucial in optical tomography. It gives the first impression on how reliable the tomography system towards its measurement. Therefore, transmitter and receiver circuit must be developed carefully with good analysis for each selection of the component units. This paper will show the effect of circuit development towards linearity performance. The aim of this paper is to construct a transmitter and receiver circuit for optical tomography application. This is done by capturing a voltage unit at the receiver side in response to the existence of obstacle that interrupt the light path between transmitter and receiver. The experiment design uses a same type of obstacle with different sizes between 0.5 until 3mm. From the result it shows the bigger the object the voltage loss value also increasing. This shows a linear relation between both parameters. Key words: Optical tomography; transmitter; receiver; circuit; linearity

Selection of Optical Tomography Parameters for Gas Bubble Shape Analysis

2014 ◽  
Vol 35 (1) ◽  
pp. 19-33 ◽  
Author(s):  
Mariusz R. Rząsa
Keyword(s):  
Optical Sensors ◽  
Optical Tomography ◽  
Electronic System ◽  
Sensor Calibration ◽  
Technical Solution ◽  
Discrete Signals ◽  
The Matrix ◽  
Measuring Sensor ◽  
Selection Of

Abstract An optical tomograph in which a tested object is illuminated from five directions has been presented in the paper. The measurements of luminous intensity after changing into discrete signals (0 or 1) in the detectors equipped with 64 optical sensors were subjected to reconstruction by means of the matrix algorithm. Detailed description of the measuring sensor, as well as the principles of operation of the electronic system, has been given in the paper. Optical phenomena occurring at the phase boundary while transmitted through the sensor wall and phenomena inside the measuring space have also been taken into account. The method of the sensor calibration has been analysed and a way of technical solution of the problem under consideration has been discussed. The elaborated method has been tested using objects of the known shape and dimensions. It was found that reconstruction of the shapes of moving bubbles and determination of their main parameters is also possible with a reasonable accuracy.

Infrared Tomography Sensor Configuration Using 4 Parallel Beam Projections

2012 ◽  
Author(s):  
Yusri Md.Yunos ◽  
Muhammad Saiful Badri Mansor ◽  
Nor Muzakkir Nor Ayob ◽  
Pang Jon Fea ◽  
Ruzairi Abdul Rahim ◽  
...  
Keyword(s):  
Key Words ◽  
Optical Tomography ◽  
Parallel Beam ◽  
Surrounding Environment ◽  
Infrared Emitter ◽  
Projection Geometry ◽  
Parallel Selection ◽  
Sensor Configuration ◽  
Infrared Tomography ◽  
Selection Of

Penyelidikan ini menunjukkan konfigurasi sensor tomografi optik dengan penggunaan pemancar inframerah dan foto transistor. Geometri unjuran sensor adalah berdasarkan kombinasi dua unjuran oktagon dan dua unjuran garis lurus tatasusunan. Sebuah perlengkapan direka untuk memegang keseluruhan pasangan pemancar–penerima secara selari. Pemilihan foto transistor juga dijelaskan supaya pembangunan sensor tomografi adalah bebas dari bacaan yang tidak diingini daripada persekitaran sekeliling. Penulisan ini juga menerangkan perkara–perkara yang perlu dipertimbangkan untuk pembangunan sensor tomografi optikal. Kata kunci: Inframerah; tomografi optikal This paper represents the configuration of optical tomography sensor by using infrared emitter and phototransistor. The projection geometry of the sensor is based on the combination of two orthogonal and two rectilinear projections arrays. A fixture is designed for holding all emitter–receiver pairs in parallel. Selection of phototransistor is explained so that the tomography sensor developed is free of noise cause by surrounding environment. This paper describes all points to be considered when design an optical tomography sensor. Key words: Infrared; optical tomography

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