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Applied Sciences
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Recent Advances and Applications of Optical and Acoustic Measurements
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Recent Advances and Applications of Optical and Acoustic Measurements

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: 20 June 2025 | Viewed by 4347

Special Issue Editors

Prof. Dr. Uma Maheswari Rajagopalan

E-Mail Website
Guest Editor
Department of Mechanical Engineering, College of Engineering, Shibaura Insitute of Technology, Tokyo 135-8548, Japan
Interests: scattering; optical coherence tomography; brain imaging; neuroscience; optics in biology; optics in environmental assessments; near-field optics; applied linguistics
Prof. Dr. Yoshikazu Koike

E-Mail Website
Guest Editor
Electronic Engineering, College of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan
Interests: ultrasonic actuator; fiber optic probe hydrophone; ultrasonic cleaning machine

Special Issue Information

Dear Colleagues,

This Special Issue invites articles from a vast range of topics that take optical and acoustic measurements in different environments, from biological to underwater settings. Optical and acoustic measurements both involve the usage of fundamental properties, such as diffraction, absorption, transmission, and scattering. Now, techniques such as optical coherence tomography and ultrasound are extensively used in clinical diagnostics worldwide. This Special Issue will not only present the advantages and the limitations of these techniques, but also inform readers about the combination of optics and sound, namely photoacoustic imaging. We welcome both review papers and original contributions related to an array of research fields. The topics of interest include, but are not restricted to:

  • Imaging;
  • Spectrometry;
  • Optical interferometric techniques;
  • Nano-optics;
  • Fiber optics;
  • Biomedical optics;
  • Photoacoustics;
  • Ultrasound in sensing;
  • Hydrophones;
  • Fiberoptic hydrophones;
  • Ultrasonic actuators;
  • Ultrasonic cleaning;
  • Ultrasonic fabrication and imaging.

Prof. Dr. Uma Maheswari Rajagopalan
Prof. Dr. Yoshikazu Koike
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • imaging
  • spectrometry
  • optical interferometric techniques
  • nano-optics
  • fiber optics
  • biomedical optics
  • photoacoustics
  • ultrasound in sensing
  • hydrophones
  • fiberoptic hydrophones
  • ultrasonic actuators
  • ultrasonic cleaning
  • ultrasonic fabrication and imaging

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Published Papers (4 papers)

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Research

19 pages, 8484 KiB  
Article
A Spatial 4-DOF Laser Collimation Measurement System
by Han Jiang, Ke Zhang, Lufeng Ji, Ruiyu Zhang and Changpei Han
Appl. Sci. 2024, 14(22), 10491; https://doi.org/10.3390/app142210491 - 14 Nov 2024
Viewed by 280
Abstract
A compact and miniaturized laser collimation system was proposed to measure the four-degrees-of-freedom of an optical payload in high-altitude space. Compared with other systems, this system has a simple structure and low cost, high measurement accuracy, and a large measurement range. The optical [...] Read more.
A compact and miniaturized laser collimation system was proposed to measure the four-degrees-of-freedom of an optical payload in high-altitude space. Compared with other systems, this system has a simple structure and low cost, high measurement accuracy, and a large measurement range. The optical structure of the system was designed, the measurement principle of the four-degree-of-freedom was described in detail, the interference between the distance measurement and the angle measurement in the optical path was analyzed, and the installation error was analyzed. The error was minimized under different temperature conditions to improve the robustness of the system. An engineering prototype was built based on the system design scheme and an experiment was conducted to measure a target with a measured distance of 500 mm. The current indicators reached the requirements for the ground testing of optical payloads. The application of the system can be used to measure six degrees of freedom simultaneously by installing two systems in different coordinate systems. The system can also be used in industry; for example, by measuring the machine tool error in real time and compensating for it, the system can improve the positioning and motion accuracy. It can also be used for feedback control of the robot’s motion by measuring and controlling it. Full article
(This article belongs to the Special Issue Recent Advances and Applications of Optical and Acoustic Measurements)
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15 pages, 3263 KiB  
Article
Fast Assessment of Quality of Water Containing Inorganic Pollutants Using Laser Biospeckles in Microbioassay
by Arti Devi, Hirofumi Kadono and Uma Maheshwari Rajagopalan
Appl. Sci. 2024, 14(13), 5558; https://doi.org/10.3390/app14135558 - 26 Jun 2024
Cited by 1 | Viewed by 1721
Abstract
Recently, bioassay techniques have been gaining prominence in assessing water toxicity, offering comprehensive evaluations without identifying the individual chemical component. However, microscopic observation is a crucial component in microbioassays to know the critical features of the targeted microorganisms. However, as the microorganism’s size [...] Read more.
Recently, bioassay techniques have been gaining prominence in assessing water toxicity, offering comprehensive evaluations without identifying the individual chemical component. However, microscopic observation is a crucial component in microbioassays to know the critical features of the targeted microorganisms. However, as the microorganism’s size becomes smaller, observation becomes more difficult due to the narrower focal depth of the imaging system. To address this challenge, we propose a novel laser biospeckle non-imaging technique utilizing biospeckle patterns generated by microorganisms, enabling non-imaging assessments of their swimming ability. Paramecium and Euglena were used as microorganisms. Paramecium and Euglena were subjected to varying concentrations of heavy metal pollutants (Zn(NO3)2·6H2O and FeSO4·7H2O), and their swimming activity was quantified using a dynamic biospeckle analysis. The results show a concentration-dependent effect of Zn on both species, leading to decreased swimming ability at increased concentration. Conversely, Fe exhibited varying effects on Paramecia and Euglena, with the latter displaying tolerance at lower concentrations but a notable response at higher concentrations. The advantage of the method is that owing to the non-imaging system, an enormous number of microorganisms can be processed. Moreover, the method allows for an immediate and statistically significant estimation of their swimming ability in response to environmental pollution. Full article
(This article belongs to the Special Issue Recent Advances and Applications of Optical and Acoustic Measurements)
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14 pages, 3675 KiB  
Article
Modeling and Analysis of a Long-Range Target Localization Problem Based on an XS Anode Single-Photon Detector
by Yihang Zhai, Bin Wang, Xiaofei Wang and Qiliang Ni
Appl. Sci. 2024, 14(6), 2400; https://doi.org/10.3390/app14062400 - 12 Mar 2024
Viewed by 806
Abstract
With the development of space detection technology, the detection of long-range dark and weak space targets has become an important issue in space detection. Cross-strip anode photon imaging detectors can detect weak light signals with extremely low dark count rates and are well [...] Read more.
With the development of space detection technology, the detection of long-range dark and weak space targets has become an important issue in space detection. Cross-strip anode photon imaging detectors can detect weak light signals with extremely low dark count rates and are well suited to applications in long-range target detection systems. Since cross-strip anode detectors are expensive to develop and fabricate, a theoretical analysis of the detection process is necessary before fabrication. During the detection process, due to the dead time of the detector, some photon-generated signals are aliased, and the true arrival position of the photon cannot be obtained. These aliased signals are usually removed directly in the conventional research. But in this work, we find that these aliased signals are not meaningless and can be applied to center of mass detection. Specifically, we model the probabilistic mechanisms of the detection data, compute the average photon positions using aliased and non-aliased data and prove that our method provides a lower variance compared to the conventional method, which only uses non-aliased data. Simulation experiments are designed to further verify the effectiveness of the aliasing data for detecting the center of mass. The simulation results support that our method of utilizing the aliasing data provides more accurate detection results than that of removing the aliasing data. Full article
(This article belongs to the Special Issue Recent Advances and Applications of Optical and Acoustic Measurements)
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15 pages, 2427 KiB  
Article
Performance Evaluation of Cross-Correlation Based Photoacoustic Measurement of a Single Object with Sinusoidal Linear Motion
by Kotaro Fujinami and Katsuaki Shirai
Appl. Sci. 2023, 13(24), 13202; https://doi.org/10.3390/app132413202 - 12 Dec 2023
Viewed by 1129
Abstract
Photoacoustic (PA) velocimetry holds the advantage of detecting ultrasound signals from selective targets sensitive to specific wavelengths of light irradiation. In particular, it is expected to be applied for measuring blood flow in microvasculature. However, PA velocimetry has not been sufficiently investigated for [...] Read more.
Photoacoustic (PA) velocimetry holds the advantage of detecting ultrasound signals from selective targets sensitive to specific wavelengths of light irradiation. In particular, it is expected to be applied for measuring blood flow in microvasculature. However, PA velocimetry has not been sufficiently investigated for small velocity ranges down to several tens of millimeters per second. This study evaluates the performance and uncertainty of PA velocity measurements using a single graphite cylinder (GC) as a moving object. A pair of short laser pulses irradiated the object within a brief time interval. The velocity was measured based on the cross-correlation peak of successive PA signal pairs in the time domain. The limiting measurement uncertainty was 3.4 mm/s, determined by the sampling rate of the digitizer. The object motion was controlled in a sinusoidal linear motion, realized using a loudspeaker. With the PA measurement, the velocity of the object was obtained with a time resolution in milliseconds and with directional discrimination. Notably, the PA velocity measurements successfully provided the local velocities of the object across a wide range, with the reference velocity obtained as the time derivative of the displacement data acquired using a laser displacement sensor (LDS). The PA measurement exhibited uncertainties ranging from 0.86 to 2.1 mm/s for the maximum and minimum velocities during the experiment. The uncertainties are consistent with those in stationary cases, and nearly constant in the investigated velocity range. Furthermore, the PA measurements revealed local fine velocities of the object, which were not resolved by the reference velocities of the LDS measurements. The capability of the PA velocity measurement was found to be advantageous for measurements of objects with dynamic variations in magnitude and direction. Full article
(This article belongs to the Special Issue Recent Advances and Applications of Optical and Acoustic Measurements)
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