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Lasing Sensing and Applications

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: closed (31 July 2024) | Viewed by 5480

Special Issue Editors


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Guest Editor
Physics and Astronomy Department, University of Florence, 50019 Florence, Italy
Interests: optical sensors; random laser; optical pulse propagation; light propagation through biological tissues and diffusive media
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Physics and Astronomy Department and LENS, University of Florence, 50019 Florence, Italy
Interests: optical sensors; random laser; optical pulse propagation; VUV spectroscopy; coherent control
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Physics and Astronomy Department, University of Florence, 50019 Florence, Italy
Interests: optical sensors; random laser; light propagation through biological tissues and diffusive media; tissues spectroscopy; diffuse optical imaging; Raman diffuse spectroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Lasers have long been used as highly sensitive measuring devices. With the rise of laser equipment, the applications of laser equipment are becoming more and more extensive. For example, laser sensors measure the position, displacement, speed, and vibration of objects. Laser sensors include different types: laser distance sensors, laser displacement sensors, laser light curtain sensors, lasers for investigating the optical properties of media, laser Raman sensors, random laser sensors, etc. With the maturity of laser sensor technology, this has led to widespread use of laser sensors in many areas. In addition to manufacturing, it can also be used in robotics, autonomous driving and biomedicine.

The goal of this Special Issue is to provide the most recent research results in laser sensor technology and its application. Topics include laser sensor design and new laser sensor technology, as well as the theoretical and numerical methods to retrieve information from laser-based sensors, application of laser sensors in various fields, and different types of laser-sensor-based devices and their applications.

Dr. Federico Tommasi
Dr. Stefano Cavalieri
Dr. Fabrizio Martelli
Guest Editors

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Published Papers (3 papers)

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Research

9 pages, 2924 KiB  
Article
A Three-Dimensional Method for Analysis of the Body Mode of Classical Guitars Using a Laser Displacement Sensor
by Kuan-Cheng Su, Tsung-Yu Hsieh, Wei-Chih Lin, Fu-Li Hsiao, Tatyana Ryzhkova and Chii-Chang Chen
Sensors 2024, 24(16), 5147; https://doi.org/10.3390/s24165147 - 9 Aug 2024
Viewed by 1883
Abstract
In classical guitar acoustic spectra, the lowest frequency body mode’s amplitude often significantly surpasses that of the string overtones. However, the characteristics of the body mode have not been systematically utilized to quantitatively represent the timbre of classical guitars. In this study, we [...] Read more.
In classical guitar acoustic spectra, the lowest frequency body mode’s amplitude often significantly surpasses that of the string overtones. However, the characteristics of the body mode have not been systematically utilized to quantitatively represent the timbre of classical guitars. In this study, we propose a quantitative method for describing the body mode, which can effectively differentiate the timbre of classical guitars. Our approach involves three key parameters presented in a three-dimensional space, as follows: the frequency and quality factors of the body mode, along with the amplitude ratio of the plucked string note to the body mode in the soundboard’s vibration spectrum. This representation allows for the visualization, quantitative comparison, and classification of the body mode note and damping properties across classical guitars. The differences in body mode among guitars can be analyzed quantitatively using Euclidean distance. Full article
(This article belongs to the Special Issue Lasing Sensing and Applications)
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12 pages, 5713 KiB  
Article
A CMOS Current-Mode Vertical-Cavity-Semiconductor-Emitting-Laser Diode Driver for Short-Range LiDAR Sensors
by Xinyue Zhang, Shinhae Choi, Yeojin Chon and Sung-Min Park
Sensors 2024, 24(11), 3513; https://doi.org/10.3390/s24113513 - 29 May 2024
Cited by 1 | Viewed by 1486
Abstract
This paper presents a current-mode VCSEL driver (CMVD) implemented using 180 nm CMOS technology for application in short-range LiDAR sensors, in which current-steering logic is suggested to deliver modulation currents from 0.1 to 10 mApp and a bias current of 0.1 mA [...] Read more.
This paper presents a current-mode VCSEL driver (CMVD) implemented using 180 nm CMOS technology for application in short-range LiDAR sensors, in which current-steering logic is suggested to deliver modulation currents from 0.1 to 10 mApp and a bias current of 0.1 mA simultaneously to the VCSEL diode. For the simulations, the VCSEL diode is modeled with a 1.6 V forward-bias voltage and a 50 Ω series resistor. The post-layout simulations of the proposed CMVD clearly demonstrate large output pulses and eye-diagrams. Measurements of the CMVD demonstrate large output pulses, confirming the simulation results. The chip consumes a maximum of 11 mW from a 3.3 V supply, and the core occupies an area of 0.1 mm2. Full article
(This article belongs to the Special Issue Lasing Sensing and Applications)
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18 pages, 5105 KiB  
Article
Two-Axial Measurement of the Angular Microdeflection of a Laser Beam Using One Single-Axis Sensor
by Marek Dobosz, Michał Jankowski and Jakub Mruk
Sensors 2023, 23(22), 9276; https://doi.org/10.3390/s23229276 - 20 Nov 2023
Viewed by 1295
Abstract
The majority of current methods for measuring the angular deflection of a laser beam enable measurement only in one selected plane. However, there are tasks in which measurements of laser beam deflections in 3D are required. In this paper, we present a way [...] Read more.
The majority of current methods for measuring the angular deflection of a laser beam enable measurement only in one selected plane. However, there are tasks in which measurements of laser beam deflections in 3D are required. In this paper, we present a way of enabling two-axial measurements of the deflection of a beam based on a single-axis sensor. The key idea is to direct a laser beam, alternately, into one of two arms of a measurement system. In the first arm, the beam is transmitted directly to the angular sensor, while in the second, the beam is directed to the sensor via a special optical element that rotates the plane of the beam deflection; in other words, this element changes the deflection in the horizontal plane into a deflection in the vertical plane, and vice versa. To alternate the path of the beam, a variable phase retarder and a polarising beamsplitter are used. The proposed technique was experimentally verified, and the results confirm its effectiveness. Full article
(This article belongs to the Special Issue Lasing Sensing and Applications)
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