Acoustic mirror

Author: m | 2025-04-24

The actuating device may be configured for rotating the acoustic mirror, translating the acoustic mirror or rotating and translating the acoustic mirror. The acoustic mirror may have a single acoustically-reflecting surface of may be a polygon having a Download Mirrors (Acoustic) - Beth MP3 song on Boomplay and listen Mirrors (Acoustic) - Beth offline with lyrics. Mirrors (Acoustic) - Beth MP3 song from the Beth’s album Mirrors (Acoustic) is released in 2025.

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Design of the combiner is composed of two prisms sandwiching a thin layer of silicone oil [31]. Then, its improved version is made of a rhomboid prism and a right-angle prism, which overcomes the series of acoustic insertion loss induced by the transforming from longitudinal-mode wave to shear-mode wave at the interface [17,32]. Customized ring-shaped focused ultrasonic transducer with a central hole to pass the optical beam is also designed to achieve optical-acoustic confocal alignment [2,20]. Furthermore, optically-transparent focused ultrasound transducers could be considered as its advanced solution [33,34] to make PAM highly integrated, and it will have great potential when the processing costs is reduced. A parabolic acoustic mirror was combined with an optical lens that has a large optical numerical aperture (NA) together to realize a submicron-resolution reflection-mode OR-PAM [23]. This combiner aimed to achieve a large optical NA, and showed good acoustic potential. Additionally, another kind of combiner is arranging a thin glass plate or perforated acoustic mirror to redirect the ultrasonic beam propagating in water to a focused ultrasonic transducer, and a confocal laser beam can pass through the transparent glass plate [26,27] or the central hole [28] to achieve confocal alignment. In a word, performance of OR-PAM is closely related to the optical-acoustic combiner. A good combiner usually requires low optical disorders, low acoustic insertion loss, strong acoustic focusing, to ensure superior optical resolution, good PA excitation efficiency, and high acoustic detection sensitivity.In this study, we propose an optical-acoustic combiner composed of a flat acoustic reflector and an off-axis parabolic acoustic mirror (OPM) with a conical bore. The optical beam can be undistorted focused on the sample through the conical bore. The OPM provides strong acoustic focusing with a large acoustic NA. To realize the large acoustic NA, the structure of the parabolic mirror used in our study is different from the reported one [23]. Additionally, in order to facilitate the placement of the transducer, we have designed a sound path with two reflection in the combiner. In comparison to the other methods, the entire acoustic propagation path from the source to the transducer in our combiner is in the water, which ensures low insertion loss and a better detection sensitivity. Additionally, the proposed combiner does not rely on customized ultrasound transducer. Commonly used commercial transducers are suitable. We demonstrated the advantage and practicality of the proposed design by using numerical simulations, phantom measurement, and in vivo imaging experiments. 2. Materials and Methods 2.1. Experimental SetupThe Nd:YAG laser (EXPL-532-2Y, Spectra-Physics Inc., Santa Clara, CA, USA) worked at a wavelength of 532 nm and the repetition rate was set at 10 kHz. Haemoglobin has strong optical absorption near 532 nm, and this laser will benefit imaging

Adjustable acoustic pattern controlled by Acoustic mirrors

Photoacoustic Microscopy Using High-Speed Alternating Illumination at 532 and 1064 Nm. J. Biophotonics 2018, 11, e201700210. [Google Scholar] [CrossRef]Tian, C.; Zhang, W.; Mordovanakis, A.; Wang, X.; Paulus, Y.M. Noninvasive Chorioretinal Imaging in Living Rabbits Using Integrated Photoacoustic Microscopy and Optical Coherence Tomography. Opt. Express 2017, 25, 15947–15955. [Google Scholar] [CrossRef]Qi, W.; Jin, T.; Rong, J.; Jiang, H.; Xi, L. Inverted Multiscale Optical Resolution Photoacoustic Microscopy. J. Biophotonics 2017, 10, 1580–1585. [Google Scholar] [CrossRef] [Green Version]Chen, Q.; Xie, H.; Xi, L. Wearable Optical Resolution Photoacoustic Microscopy. J. Biophotonics 2019, 12, e201900066. [Google Scholar] [CrossRef]Zhang, X.; Ding, Q.; Qian, X.; Tao, C.; Liu, X. Reflection-Mode Optical-Resolution Photoacoustic Microscopy with High Detection Sensitivity by Using a Perforated Acoustic Mirror. Appl. Phys. Lett. 2018, 113, 183706. [Google Scholar] [CrossRef]Qiu, T.; Yang, J.; Pan, T.; Pan, T.; Peng, C.; Jiang, H.; Luo, Y. Assessment of Liver Function Reserve by Photoacoustic Tomography: A Feasibility Study. Biomed. Opt. Express 2020, 11, 3985–3995. [Google Scholar] [CrossRef]Dai, X.; Yang, H.; Jiang, H. In Vivo Photoacoustic Imaging of Vasculature with a Low-Cost Miniature Light Emitting Diode Excitation. Opt. Lett. 2017, 42, 1456. [Google Scholar] [CrossRef]Maslov, K.; Zhang, H.F.; Hu, S.; Wang, L.V. Optical-Resolution Photoacoustic Microscopy for in Vivo Imaging of Single Capillaries. Opt. Lett. 2008, 33, 929. [Google Scholar] [CrossRef]Hu, S.; Maslov, K.; Wang, L.V. Second-Generation Optical-Resolution Photoacoustic Microscopy with Improved Sensitivity and Speed. Opt. Lett. 2011, 36, 1134. [Google Scholar] [CrossRef] [Green Version]Park, S.; Kang, S.; Chang, J.H. Optically Transparent Focused Transducers for Combined Photoacoustic and Ultrasound Microscopy. J. Med. Biol. Eng. 2020, 40, 707–718. [Google Scholar] [CrossRef]Fang, C.; Hu, H.; Zou, J. A Focused Optically Transparent PVDF Transducer for Photoacoustic Microscopy. IEEE Sens. J. 2020, 20, 2313–2319. [Google Scholar] [CrossRef] Figure 1. Schematic diagram of optical-resolution photoacoustic microscopy (OR-PAM) setup. FC: fiber coupling, SMF: single mode fiber, CL: collimating-mirror, BS: beam splitter, PD: photodiode, DAQ: data acquisition. Dotted box gives the details of the optical–acoustic combiner. OL: objective lens, OPM: off-axis parabolic acoustic mirror, UT: ultrasonic transducer, FR: flat acoustic reflector. Figure 1. Schematic diagram of optical-resolution photoacoustic microscopy (OR-PAM) setup. FC: fiber coupling, SMF: single mode fiber, CL: collimating-mirror, BS: beam splitter, PD: photodiode, DAQ: data acquisition. Dotted box gives the details of the optical–acoustic combiner. OL: objective lens, OPM: off-axis parabolic acoustic mirror, UT: ultrasonic transducer, FR: flat acoustic reflector. Figure 2. Profile map of the OPM, CA: central axis, D: diameter; OAD: off-axis distance; PFL: parent focal length; RFL: reflected focal length. Figure 2. Profile map of the OPM, CA: central axis, D: diameter; OAD: off-axis distance; PFL: parent focal length; RFL: reflected focal length. Figure 3. Two kinds of acoustic focusing schemes. (a) A spherically-focused transducer combined with a flat acoustic reflector. (b) A

The Acoustic mirror by Like Mirror: The solution to isolate

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The Acoustic Mirror - Google Books

Brings much convenience while designing the combiner scheme.The proposed combiner has the following characteristics. First, the ultrasonic beam propagating path in this combiner is only in water. The ultrasonic beam does not transmit through any acoustic lens or other solid separators. It prevents the acoustic energy loss due to the acoustic impedance mismatching or the longitudinal-shear mode transforming at the liquid–solid interface. Therefore, this design guarantees low insertion loss. Second, the combiner achieves the acoustic focusing using the OPM, instead of acoustic lens. The OPM can provide a larger NA than the focused transducer. Therefore, the combiner has stronger acoustic focusing ability and better receiving sensitivity. Third, the ultrasonic beam is approximately collimated after being reflected by the OPM. It is convenient to settle a flat transducer or flat acoustic mirror in the combiner to redirect and receive the ultrasonic beam. Fourth, the combiner does not bring any additional optical element in the optical path, which promises low optical disorders. These characteristics would be useful in improving the performance of OR-PAM. 3.2. System PerformanceThe performance of the proposed optical-acoustic combiner was tested by phantom experiments. The experimental setup used for the performance test and imaging experiments is presented in Figure 1. The optical-acoustic confocal alignment was achieved before experiments. First, we carefully designed and customized the combiner and the parabolic mirror. The ultrasound transducer can be stably fixed in the combiner and the position of the acoustic focal spot can be approximately estimated according to the design. Second, by illuminating unfocused laser (not through the combiner) on a particle, we generated a point acoustic source. We could determine the position of the acoustic focal point, by adjusting the combiner in x, y, z direction until maximizing the received signal, which is similar to the experiments given in Figure 5. Third, we moved the acoustic focal spot to a black tape and adjust the position of the incident laser beam (through the combiner) until maximizing the receiving signal. Then, we can say that the confocal alignment is achieved.In the first experiment, we examined the ability of ultrasonic focusing of the combiner. The imaging target is a single polyester particle with a diameter of approximately 100 μm. We separated the single microsphere and then taped it on a cover glass. There was some interspace between the tape and the microsphere and we filled it with distilled water. Laser beam with a diameter approximately 5 mm was directly illuminating on the micro-particle from below, through a mirror under the target, but not through the combiner. Whereas, generated PA signals were detected through the ultrasonic transducer in the combiner. The combiner was moved by the 2D motorized translational stage. Then, images of the micro-particle

Fulwell Acoustic Mirror - northeastheritagelibrary.co.uk

The carbon fiber, indicated by the white arrow in (a). MAP: maximum amplitude projection. Figure 7. PA imaging of the brain vasculatures of a mouse through an intact skull. (a) The normalized MAP image of the brain vasculature. (b) The depth-encoded image of the brain vasculatures. The scale bar in the figure represents 1 mm. PA: photoacoustic. Figure 7. PA imaging of the brain vasculatures of a mouse through an intact skull. (a) The normalized MAP image of the brain vasculature. (b) The depth-encoded image of the brain vasculatures. The scale bar in the figure represents 1 mm. PA: photoacoustic. Figure 8. PA imaging of the iris of a live mouse. (a) The normalized MAP image of the iris. The eyelid around is also imaged. (b) The depth-encoded image of the iris and surrounding tissues. The scale bar (the white solid line) in the figure represents 500 μm. Figure 8. PA imaging of the iris of a live mouse. (a) The normalized MAP image of the iris. The eyelid around is also imaged. (b) The depth-encoded image of the iris and surrounding tissues. The scale bar (the white solid line) in the figure represents 500 μm. Table 1. The system specifications of the proposed OPM. Table 1. The system specifications of the proposed OPM. Off-Axis Distance [mm]Diameter of OPM [mm]RFL of OPM [mm]PFL of OPM [mm]616148.5 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( Share and Cite MDPI and ACS Style Zhang, X.; Liu, Y.; Tao, C.; Yin, J.; Hu, Z.; Yuan, S.; Liu, Q.; Liu, X. High-Sensitivity Optical-Resolution Photoacoustic Microscopy with an Optical-Acoustic Combiner Based on an Off-Axis Parabolic Acoustic Mirror. Photonics 2021, 8, 127. AMA Style Zhang X, Liu Y, Tao C, Yin J, Hu Z, Yuan S, Liu Q, Liu X. High-Sensitivity Optical-Resolution Photoacoustic Microscopy with an Optical-Acoustic Combiner Based on an Off-Axis Parabolic Acoustic Mirror. Photonics. 2021; 8(4):127. Chicago/Turabian Style Zhang, Xiang, Yang Liu, Chao Tao, Jie Yin, Zizhong Hu, Songtao Yuan, Qinghuai Liu, and Xiaojun Liu. 2021. "High-Sensitivity Optical-Resolution Photoacoustic Microscopy with an Optical-Acoustic Combiner Based on an Off-Axis Parabolic Acoustic Mirror" Photonics 8, no. 4: 127. APA Style Zhang, X., Liu, Y., Tao, C., Yin, J., Hu, Z., Yuan, S., Liu, Q., & Liu, X. (2021). High-Sensitivity Optical-Resolution Photoacoustic Microscopy with an Optical-Acoustic Combiner Based on an Off-Axis Parabolic Acoustic Mirror. Photonics, 8(4), 127. Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Yep.First, the sound moves from left to right, between the acoustic centers of the speakers. Since a speaker's acoustic center may not be its physical center, you should use the first Lateral test to adjust your speakers until the sound traverses a 60 degrees angle from the listener's point of view. Second, the sound moves from beyond the right loudspeaker to beyond the left (about 1' out from acoustic center). The next two signals are the mirror image of the above; third, from right to left speaker, and fourth, from beyond the left to beyond the right.Again, grade your system by how straight, continuous, and symmetrical this path is. Grade the beyond path by how far out from the speaker it appears to go (about 1' to the left or right of the requisite speaker, according to Doug Jones), and that it does not approach or recede from the listener.. The actuating device may be configured for rotating the acoustic mirror, translating the acoustic mirror or rotating and translating the acoustic mirror. The acoustic mirror may have a single acoustically-reflecting surface of may be a polygon having a