Comparison of photoacoustic imaging systems using continuous-wave lasers with a chirped intensity modulation frequency to pulsed lasers

2011 ◽  
Author(s):  
Adam Petschke ◽  
Patrick J. La Rivière
Keyword(s):  
Continuous Wave ◽  
Photoacoustic Imaging ◽  
Modulation Frequency ◽  
Intensity Modulation ◽  
Imaging Systems ◽  
Pulsed Lasers

scholarly journals Roadmap of Terahertz Imaging 2021

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4092
Author(s):  
Gintaras Valušis ◽  
Alvydas Lisauskas ◽  
Hui Yuan ◽  
Wojciech Knap ◽  
Hartmut G. Roskos
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Computational Imaging ◽  
Imaging Systems ◽  
Thz Imaging ◽  
Operational Conditions ◽  
Frequency Combs ◽  
Wave Imaging ◽  
On Chip ◽  
Nano Imaging

In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

Analysis of data transmission technique based on pulsed laser

2012 ◽  
Vol 20 (1) ◽  
Author(s):  
T. Drozd ◽  
M. Zygmunt ◽  
P. Knysak ◽  
J. Wojtanowski
Keyword(s):  
Data Transmission ◽  
Continuous Wave ◽  
Pulsed Laser ◽  
Pulsed Lasers ◽  
Transmission Method ◽  
Transmission Systems ◽  
Laser Technology ◽  
Light Pulses ◽  
Transmission Technique ◽  
Transmission Speed

AbstractPulsed lasers are used mainly in lidar systems as sources of short and highly energetic light pulses. In data transmission systems continuous wave lasers are typically applied, however it is also possible to use pulsed lasers in such systems. Such approach seems to be especially reasonable for devices where a pulsed laser is applied anyway and executes another function (rangefinding). The article discusses a data transmission concept based on a pulsed laser technology. Advantages and limits of such a transmission method are described. Influence of individual transmission elements on the effective data transmission speed is analysed.

An autofocusing method for imaging the targets for TWI radar systems with correction of thickness and dielectric constant of wall

2018 ◽  
Vol 11 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Sandeep Kaushal ◽  
Bambam Kumar ◽  
Dharmendra Singh
Keyword(s):  
Genetic Algorithm ◽  
Dielectric Constant ◽  
Continuous Wave ◽  
Signal To Noise Ratio ◽  
Imaging Systems ◽  
Signal To Noise ◽  
Radar Systems ◽  
Stepped Frequency ◽  
Correct Image ◽  
Wall Imaging

AbstractIn through the wall imaging systems, wall parameters like its thickness and dielectric constant play an important role in the true and correct image formation of an object behind the wall made of various materials like brick cement, wood, plastic, etc. Incorrect estimation of these parameters leads to dislocation of the object and smearing or blurriness of the image too. A new autofocusing technique for a stepped frequency continuous wave -based radar at the frequency of 1–3 Ghz has been developed that corrects the wall's parameters like its thickness and dielectric constant and provides a better focused image of the target. For this purpose, a peak signal to noise ratio -based autofocusing technique has been developed by using curve fitting and the genetic algorithm. It is observed that the proposed technique has capability to focus the image up to good extent.

scholarly journals Матричное радиовидение на основе гетеродинного приема с применением радиолокации непрерывным излучением

2022 ◽  
Vol 48 (1) ◽  
pp. 47
Author(s):  
С.А. Королев ◽  
А.В. Горюнов ◽  
В.В. Паршин
Keyword(s):  
Continuous Wave ◽  
Angular Resolution ◽  
Imaging System ◽  
Imaging Systems ◽  
New Approach ◽  
Wave Radio ◽  
Radio Imaging ◽  
Wave Radar ◽  
Previous Level ◽  
Array Receiver

A new approach to the creation of millimeter-wave radio imaging systems is proposed. This approach is based on the use of an array receiver consisting of a densely packed (pixel size - 4 mm) array of planar mixers located in the focal plane of a quasi-optical objective, with application of the frequency-modulated continuous-wave radar technique. It has been demonstrated that the implementation of the heterodyne type of reception makes it possible to increase the distance range of the array radio imaging system up to ~ 100 m while maintaining the angular resolution at the previous level.

Application of continuous wave and pulsed lasers in triplet?triplet annihilation upconversion (Invited)

2020 ◽  
Vol 49 (12) ◽  
pp. 20201068-20201068
Author(s):  
曹怀满 Huaiman Cao ◽  
侯玉琦 Yuqi Hou ◽  
赵建章 Jianzhang Zhao
Keyword(s):  
Continuous Wave ◽  
Pulsed Lasers ◽  
Triplet Triplet Annihilation

Histologic Evaluation of Laser Lipolysis Comparing Continuous Wave vs Pulsed Lasers in an In Vivo Pig Model

2011 ◽  
Vol 13 (1) ◽  
Author(s):  
Jessica R. Levi ◽  
Anna Veerappan ◽  
Bo Chen ◽  
Mirko Mirkov ◽  
Ray Sierra ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Pig Model ◽  
Pulsed Lasers ◽  
Laser Lipolysis ◽  
Histologic Evaluation
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