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Topic Review
Dual-Frequency Solid-State Lasers for Synthetic-Wave Absolute-Distance Interferometry
Frequency-difference-stabilized dual-frequency solid-state lasers with tunable and large frequency difference have become an ideal light source for the high-accuracy absolute-distance interferometric system due to their stable multistage synthetic wavelengths.
  • 588
  • 06 Apr 2023
Topic Review
Atom Chips for Absolute Gravity Sensors
As a powerful tool in scientific research and industrial technologies, the cold atom absolute gravity sensor (CAGS) based on cold atom interferometry has been proven to be the most promising new generation high-precision absolute gravity sensor. However, large size, heavy weight, and high–power consumption are still the main restriction factors of CAGS being applied for practical applications on mobile platforms. Combined with cold atom chips, it is possible to drastically reduce the complexity, weight, and size of CAGS.
  • 565
  • 07 Jun 2023
Topic Review
Applications of Optical Sensors in CMOS
CMOS (complementary metal-oxide semiconductor)  technology allows integration with the CMOS readout and control electronics in the same microdevice, featuring high-volume fabrication with high-reproducibility and low-cost. Optical sensors in CMOS are being used extensively in the medical field as a key element in spectroscopy analysis. More specifically, they have been a great advance in the detection of gastrointestinal dysplasia and in the studies of Malaria infection. Furthermore, they have been applied in labs-on-a-chip and, more recently, in organs-on-a-chip devices and X-ray imaging. Optical sensors in CMOS are also promising solutions for other types of applications such as, for example, in photovoltaic (PV) sub-modules to measure the angles of incident light in the PV panels.
  • 551
  • 27 Feb 2024
Topic Review
Low-Cost Computer-Vision-Based Embedded Systems for Unmanned Aerial Vehicles
Unmanned Aerial Vehicles (UAVs) are versatile, adapting hardware and software for research. They are vital for remote monitoring, especially in challenging settings such as volcano observation with limited access. In response, economical computer vision systems provide a remedy by processing data, boosting UAV autonomy, and assisting in maneuvering. Through the application of these technologies, researchers can effectively monitor remote areas, thus improving surveillance capabilities. Moreover, flight controllers employ onboard tools to gather data, further enhancing UAV navigation during surveillance tasks. 
  • 538
  • 14 Nov 2023
Topic Review
Detection of Anomalies Using Acoustic Emission When Welding
Welding inspection is a critical process that can be severely time-consuming, resulting in productivity delays, especially when destructive or invasive processes are required. With non-destructive approaches, the actual service part can be inspected in both a speedy and non-invasive manner. A multi-spectral approach is used to give more confidence and information related to the anomaly of interest. This system is very portable and essentially could be used in most joining setup situations.
  • 504
  • 23 Aug 2023
Topic Review
Forward Head Posture and Biofeedback
Forward Head Posture (FHP) is when the head leans forward due to factors such as heavy backpacks or poor computer ergonomics. FHP can lead to neck strain and discomfort as well as potential long-term issues such as arthritis. Treatment options include specialized exercises, orthopedic devices, manual therapy, physical exercises, and visual feedback techniques, along with guidance from specialists in physical medicine and rehabilitation. In this study, a visual feedback-based approach was used to address FHP in female students. 
  • 487
  • 29 Jan 2024
Topic Review
Conceptualization and Implementation of Proposed On-Water Rowing System
In competitive rowing, the finish time of a typical 2000 m race is governed by many factors during the course. These influencing factors are broadly known as rowing kinetics. They refer to biomechanical parameters concerned with the movement of the athlete’s body and the reaction of the boat equipment (oars, seat) to such input. The rapid advancements in multi-sensor technologies and data processing techniques opened widely the road for the development of specialized monitoring systems to fulfill the requirements for numerous applications.
  • 443
  • 14 Jul 2023
Topic Review
Applications of Microflows
Microfluidics is an interdisciplinary research subject that provides precise liquid control and manipulation, empowering quick and high throughput test handling incorporated into small-size clinical frameworks. The work provides the details review on the available microfluidic monitoring techniques
  • 433
  • 06 Mar 2023
Topic Review
Ornamental Turning
Ornamental turning is a type of turning, a craft that involves cutting of a work mounted in a lathe. The work can be made of any material that is suitable for being cut in this way, such as wood, bone, ivory or metal. Plain turning is work executed on a lathe where a transverse section through any part of the work comprises a plain circle. Ornamental turning, also called Complex turning, is executed on a lathe with attachments which convert that plain circular section to variants of outline; these range from a simple series of cuts taken at intervals around the work (so producing grooves or bumps on the surface) to non-circular movements whereby the whole of the circular shape is removed to give a completely different form. Such shapes are achieved by various means, the principal ones being: Cutting with a fixed or revolving cutter while the work is rotated on a non-radial path, e.g.- eccentrically, elliptically, epicyclically or, following a path determined by a template or reciprocating device. Cutting with a revolving cutter while the work remains static, then partially rotating the work and holding it in each new position (using an indexing device) so as to produce a series of cuts at intervals around the cylinder or surface. Cutting with a fixed or revolving cutter while the work is rotated on a radial or non-radial path and the cutting apparatus follows a linear, circular or non-circular motion, the two motions being synchronised by gearing.
  • 406
  • 15 Nov 2022
Topic Review
Orbital Angular Momentum Light from Azopolymer Thin Films
Orbital angular momentum (OAM) encoding is a promising technique to boost data transmission capacity in optical communications. Azobenzene films have gained attention as a versatile tool for creating and altering OAM-carrying beams. Unique features of azobenzene films make it possible to control molecular alignment through light-induced isomerization about the azo bond. This feature enables the fabrication of diffractive optical devices such as spiral phase plates and holograms by accurately imprinting a phase profile on the incident light. By forming azobenzene sheets into diffractive optical elements, such as spiral phase plates, one can selectively create OAM-carrying beams. Due to the helical wavefront and phase variation shown by these beams, multiple distinct channels can be encoded within a single optical beam. This can significantly increase the data transmission capacity of optical communication systems with this OAM multiplexing technique. Additionally, holographic optical components made from azobenzene films can be used to build and reconstruct intricate wavefronts. It is possible to create OAM-based holograms by imprinting holographic designs on azobenzene films, which makes it simpler to control and shape optical beams for specific communication requirements. In addition, azobenzene-based materials can then be suitable for integration into optical communication devices because of their reconfigurability, compactness, and infrastructure compatibility, which are the main future perspectives for achieving OAM-based technologies for the next generation, among other factors.
  • 400
  • 06 Dec 2023
Topic Review
Light Detection and Ranging Data Testing Methods
Reports suggest that while both the LiDAR (Light Detection and Ranging) and RADAR (Radio Detection and Ranging) systems detected the pedestrian about six seconds before the registered impact, a misclassification of the pedestrian as an “unknown object” led to the unfortunate crash. LiDAR presents the least technological development when it comes to the identification of anomalous data. While per-point detection is a well-explored field of anomaly detection, object-level and pattern-based approaches remain few and far between.
  • 391
  • 09 Oct 2023
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