Experimental and theoretical evaluation of rotating orthogonal polarization imaging

2009 ◽  
Vol 14 (3) ◽  
pp. 034006 ◽  
Author(s):  
Qun Zhu ◽  
Ian M. Stockford ◽  
John A. Crowe ◽  
Stephen P. Morgan
Keyword(s):  
Orthogonal Polarization ◽  
Theoretical Evaluation ◽  
Polarization Imaging

Reliable Assessment of Skin Flap Viability Using Orthogonal Polarization Imaging

2003 ◽  
Vol 112 (2) ◽  
pp. 547-555 ◽  
Author(s):  
Wendy-Ann M. Olivier ◽  
Alexes Hazen ◽  
Jamie P. Levine ◽  
Hooman Soltanian ◽  
Seum Chung ◽  
...  
Keyword(s):  
Skin Flap ◽  
Orthogonal Polarization ◽  
Polarization Imaging ◽  
Flap Viability ◽  
Reliable Assessment

LIQUID CRYSTAL BASED ROTATING ORTHOGONAL POLARIZATION IMAGING SYSTEM

2009 ◽  
Vol 02 (03) ◽  
pp. 245-251 ◽  
Author(s):  
QUN ZHU ◽  
IAN M. STOCKFORD ◽  
JOHN A. CROWE ◽  
STEPHEN P. MORGAN
Keyword(s):  
Liquid Crystal ◽  
Imaging System ◽  
Polarization State ◽  
Ease Of Use ◽  
Orthogonal Polarization ◽  
Clinical Use ◽  
Scattering Medium ◽  
Scattering Media ◽  
Polarization Imaging ◽  
Manual Rotation

Rotating orthogonal polarization imaging provides images of the polarization properties of scattering media which are free from surface reflections. Previously the technique has been demonstrated using manually rotated Glan–Thompson polarizers to control and analyze the polarization state of the light entering and emerging from the tissue. This paper describes a system that performs these functions using liquid crystal retarders. The system is tested using a polarizing target embedded within a scattering medium and is compared with Monte Carlo simulations. The results compare well with those obtained with manual rotation of polarizers. The liquid crystal based approach has advantages over the previous system in terms of ease of use, speed, and repeatability and is therefore an important step towards taking the technique into routine clinical use.

Rotating orthogonal polarization imaging

2008 ◽  
Vol 33 (13) ◽  
pp. 1503 ◽  
Author(s):  
Stephen P. Morgan ◽  
Qun Zhu ◽  
Ian M. Stockford ◽  
John A. Crowe
Keyword(s):  
Orthogonal Polarization ◽  
Polarization Imaging

Rotating orthogonal polarization imaging for tissue imaging

2008 ◽  
Author(s):  
Stephen P. Morgan ◽  
Qun Zhu ◽  
Ian M. Stockford ◽  
John A. Crowe
Keyword(s):  
Tissue Imaging ◽  
Orthogonal Polarization ◽  
Polarization Imaging

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

Simply supported FPEDs connected by springs for broadband energy harvesting

2020 ◽  
Vol 64 (1-4) ◽  
pp. 201-210
Author(s):  
Yoshikazu Tanaka ◽  
Satoru Odake ◽  
Jun Miyake ◽  
Hidemi Mutsuda ◽  
Atanas A. Popov ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Evaluation Method ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Functional Materials ◽  
Vibration Energy ◽  
Theoretical Evaluation ◽  
Vibration Energy Harvester ◽  
Polyvinylidene Difluoride ◽  
Simply Supported

Energy harvesting methods that use functional materials have attracted interest because they can take advantage of an abundant but underutilized energy source. Most vibration energy harvester designs operate most effectively around their resonant frequency. However, in practice, the frequency band for ambient vibrational energy is typically broad. The development of technologies for broadband energy harvesting is therefore desirable. The authors previously proposed an energy harvester, called a flexible piezoelectric device (FPED), that consists of a piezoelectric film (polyvinylidene difluoride) and a soft material, such as silicon rubber or polyethylene terephthalate. The authors also proposed a system based on FPEDs for broadband energy harvesting. The system consisted of cantilevered FPEDs, with each FPED connected via a spring. Simply supported FPEDs also have potential for broadband energy harvesting, and here, a theoretical evaluation method is proposed for such a system. Experiments are conducted to validate the derived model.

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

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