Ultrahigh frequency ultrasonic transducers

2012 ◽  
Vol 131 (4) ◽  
pp. 3496-3496
Author(s):  
K. Kirk Shung
Keyword(s):  
Ultrasonic Transducers ◽  
Ultrahigh Frequency

scholarly journals Simulation and fabrication of 0–3 composite PZT films for ultrahigh frequency (100–300 MHz) ultrasonic transducers

2016 ◽  
Vol 119 (9) ◽  
pp. 094103 ◽  
Author(s):  
Xiaoyang Chen ◽  
Chunlong Fei ◽  
Zeyu Chen ◽  
Ruimin Chen ◽  
Ping Yu ◽  
...  
Keyword(s):  
Ultrasonic Transducers ◽  
Ultrahigh Frequency ◽  
Pzt Films

scholarly journals Measurements of acoustic radiation force of ultrahigh frequency ultrasonic transducers using model-based approach

2021 ◽  
Author(s):  
Sangnam Kim ◽  
Sunho Moon ◽  
Sunghoon Rho ◽  
Sangpil Yoon
Keyword(s):  
Single Cell ◽  
Acoustic Radiation ◽  
Ultrasonic Transducer ◽  
Radiation Force ◽  
Solid Sphere ◽  
Acoustic Radiation Force ◽  
Ultrasonic Transducers ◽  
Ultrahigh Frequency ◽  
Cell Phenotype ◽  
Target Cells

AbstractEven though ultrahigh frequency ultrasonic transducers over 60 MHz have been used for single cell level manipulation such as intracellular delivery, acoustic tweezers, and stimulation to investigate cell phenotype and cell mechanics, no techniques have been available to measure actual acoustic radiation force (ARF) applied to target cells. Therefore, we have developed an approach to measure ARF of ultrahigh frequency ultrasonic transducers using theoretical model of the dynamics of a solid sphere in a gelatin phantom. To estimate ARF at the focus of 130 MHz transducer, we matched measured maximum displacements of a solid sphere with theoretical calculations. We selected appropriate ranges of input voltages and pulse durations for single cell applications and estimated ARF were in the range of tens of pN to nN. FRET live cell imaging was demonstrated to visualize calcium transport between cells after a target single cell was stimulated by the developed ultrasonic transducer.

scholarly journals Ultrahigh Frequency (100 MHz–300 MHz) Ultrasonic Transducers for Optical Resolution Medical Imagining

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Chunlong Fei ◽  
Chi Tat Chiu ◽  
Xiaoyang Chen ◽  
Zeyu Chen ◽  
Jianguo Ma ◽  
...  
Keyword(s):  
Optical Resolution ◽  
Ultrasonic Transducers ◽  
Ultrahigh Frequency ◽  
Medical Imagining

Probing the Spatial Impulse Response of Ultrahigh-Frequency Ultrasonic Transducers with Photoacoustic Waves

2020 ◽  
Vol 14 (3) ◽  
Author(s):  
Qiang-Bing Lu ◽  
Tuo Liu ◽  
Lei Ding ◽  
Ming-Hui Lu ◽  
Jie Zhu ◽  
...  
Keyword(s):  
Impulse Response ◽  
Ultrasonic Transducers ◽  
Ultrahigh Frequency

scholarly journals Development of lead-free single-element ultrahigh frequency (170–320MHz) ultrasonic transducers

Ultrasonics ◽  
2013 ◽  
Vol 53 (5) ◽  
pp. 1033-1038 ◽  
Author(s):  
Kwok Ho Lam ◽  
Hong Fen Ji ◽  
Fan Zheng ◽  
Wei Ren ◽  
Qifa Zhou ◽  
...  
Keyword(s):  
Ultrasonic Transducers ◽  
Lead Free ◽  
Ultrahigh Frequency ◽  
Single Element

scholarly journals Ultrahigh frequency lensless ultrasonic transducers for acoustic tweezers application

2012 ◽  
Vol 110 (3) ◽  
pp. 881-886 ◽  
Author(s):  
Kwok Ho Lam ◽  
Hsiu-Sheng Hsu ◽  
Ying Li ◽  
Changyang Lee ◽  
Anderson Lin ◽  
...  
Keyword(s):  
Ultrasonic Transducers ◽  
Ultrahigh Frequency ◽  
Acoustic Tweezers

scholarly journals Ultrahigh Frequency Ultrasonic Transducers Design with Low Noise Amplifier Integrated Circuit

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 515 ◽  
Author(s):  
Di Li ◽  
Chunlong Fei ◽  
Qidong Zhang ◽  
Yani Li ◽  
Yintang Yang ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
Ultrasonic Transducers ◽  
Oxide Semiconductor ◽  
Ultrahigh Frequency ◽  
Common Source ◽  
Echo Signal ◽  
Silicon Lens ◽  
Noise Amplifier

This paper describes the design of an ultrahigh frequency ultrasound system combined with tightly focused 500 MHz ultrasonic transducers and high frequency wideband low noise amplifier (LNA) integrated circuit (IC) model design. The ultrasonic transducers are designed using Aluminum nitride (AlN) piezoelectric thin film as the piezoelectric element and using silicon lens for focusing. The fabrication and characterization of silicon lens was presented in detail. Finite element simulation was used for transducer design and evaluation. A custom designed LNA circuit is presented for amplifying the ultrasound echo signal with low noise. A Common-source and Common-gate (CS-CG) combination structure with active feedback is adopted for the LNA design so that high gain and wideband performances can be achieved simultaneously. Noise and distortion cancelation mechanisms are also employed in this work to improve the noise figure (NF) and linearity. Designed by using a 0.35 μm complementary metal oxide semiconductor (CMOS) technology, the simulated power gain of the echo signal wideband amplifier is 22.5 dB at 500 MHz with a capacitance load of 1.0 pF. The simulated NF at 500 MHz is 3.62 dB.

Method of high frequency therapy at cows' mastitis during machine milking

2020 ◽  
pp. 9-12
Author(s):  
Viktor E. Lyubimov ◽  
Keyword(s):  
Dairy Cows ◽  
Electromagnetic Fields ◽  
High Frequency ◽  
High Efficiency ◽  
Environmentally Friendly ◽  
Ultrahigh Frequency ◽  
Machine Milking ◽  
High Frequency Electromagnetic Field ◽  
Milking Machine ◽  
Methods Of Treatment

Health of dairy cows ensures human health, so it is important that dairy products do not contain antibiotics that are used to treat any inflammation, including mastitis. In Russia at present, the problem of mastitis in cows exists with both attached and loose housing of cows. Mastitis of dairy cows are the great problem in milking husbandry. Losses from mastitis in milk yield can reach 15-20%. The main reasons for the occurrence of nonspecific mastitis of cows are the shortcomings of the working components of the milking machine: the degree of deterioration of the nipple rubber and the violation of machine milking technology (the reduction in pre-milking time and vacuum fluctuations account for 70% of all causes). Treatment of mastitis with antibiotics is effective, but not environmentally friendly and unacceptable. For the treatment of inflammation of the udder, it is necessary to use more environmentally friendly methods of treatment, one of which is the exposure to ultra-high frequency electromagnetic field tested by medicine. Use of three types of medical-mobile milking machines with the same method of exposure to ultrahigh-frequency electromagnetic fields on cow's nipples through electrodes in milking cups: LPDA-1-UHF, LPDA-2-UHF and LPDA-UHF-30 M, is described in the article. Author proved that cows with subclinical forms of mastitis recovered faster during milking with exposure to the ultrahigh frequency than when treated by antibiotics, and milking with the ultrahigh frequency device helps to recover 82% of the affected quarters with clinical forms and 100% of cows with subclinical forms of mastitis or with udder irritation. The high efficiency of the method of exposure to electromagnetic fields of the ultrahigh frequency during machine milking by means of medical-mobile milking machines LPDA-UHF for the prevention and treatment of mastitis of cows was shown.

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