公开(公告)号：US20200235279A1

公开(公告)日：2020-07-23

申请号：US16747354

申请日：2020-01-20

Applicant: California Institute of Technology

Inventor： Hyeong Jae LEE ,  Yoseph BAR-COHEN ,  Mircea BADESCU ,  Stewart SHERRIT ,  Xiaoqi BAO

IPC: H01L41/083 ,  H02N2/00 ,  H01L41/09

Abstract: An ultrasonic actuator with increased radiating surface is presented. The increased radiating surface is provided by a plurality of piezoelectric stacks that are each compressed by action of a respective bolt against a common backing structure of the actuator. According to one aspect, each of the stacks includes a plurality of stacked piezoelectric rings with the respective bolt arranged through the central opening of the rings. According to another aspect, one or both of the backing structure and the horn of the actuator include tuning grooves and/or tuning slots to produce amplitude uniformity of displacement through the actuator. According to another aspect, the radiating surface has a symmetrical shape about an axial direction of the actuator with a lateral dimension that is in a range between one quarter and one half of the wavelength of operation of the actuator.

公开(公告)号：US20170131241A1

公开(公告)日：2017-05-11

申请号：US15413237

申请日：2017-01-23

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Yoseph BAR-COHEN ,  Mircea BADESCU ,  Shyh-Shiuh LIH ,  Stewart SHERRIT ,  Nobuyuki TAKANO ,  Patrick N. OSTLUND ,  Hyeong Jae LEE ,  Xiaoqi BAO

IPC: G01N29/22 ,  H01L41/053 ,  B06B1/06 ,  G01F23/296 ,  G01N29/24

CPC classification number: G01N29/223 ,  B06B1/0215 ,  B06B1/0644 ,  B06B3/00 ,  G01F23/2962 ,  G01N29/228 ,  G01N29/2437 ,  G01N2291/011 ,  G01N2291/044 ,  G01N2291/101 ,  H01L41/053

Abstract: A high temperature ultrasonic probe and a mounting fixture for attaching and aligning the probe to a steam pipe using blind alignment. The high temperature ultrasonic probe includes a piezoelectric transducer having a high temperature. The probe provides both transmitting and receiving functionality. The mounting fixture allows the high temperature ultrasonic probe to be accurately aligned to the bottom external surface of the steam pipe so that the presence of liquid water in the steam pipe can be monitored. The mounting fixture with a mounted high temperature ultrasonic probe are used to conduct health monitoring of steam pipes and to track the height of condensed water through the wall in real-time.

公开(公告)号：US20190299252A1

公开(公告)日：2019-10-03

申请号：US16367075

申请日：2019-03-27

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Stewart SHERRIT ,  Xiaoqi BAO ,  Yoseph BAR-COHEN ,  Mircea BADESCU ,  Hyeong Jae LEE

IPC: B06B1/06 ,  B25D16/00 ,  G01V1/00 ,  A61B17/22

Abstract: A dual frequency ultrasonic and sonic actuator with constrained impact mass is presented. According to one aspect, displacement of the impact mass is constrained by cavity to which ultrasonic stress from the tip of a horn is applied. According to another aspect, the displacement of the impact mass is constrained by a spring attached to the tip of the horn. According to another aspect, the displacement of the impact mass is constrained by a flexure. The constrained impact mass converts the ultrasonic stress to lower frequency sonic stress that is coupled to a transmitting element for transmission through a surface. According to one aspect, the transmitting element is a longitudinal probe. According to another aspect, the transmitting element is a drill bit used to penetrate though the surface. According to another aspect, the transmitting element is a thumper used to transmit elastic waves though the surface.

公开(公告)号：US20180306633A1

公开(公告)日：2018-10-25

申请号：US15957495

申请日：2018-04-19

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Yoseph BAR-COHEN ,  Shyh-Shiuh LIH ,  Hyeong Jae LEE ,  Mircea BADESCU

IPC: G01F23/296 ,  G01N29/024

CPC classification number: G01F23/2962 ,  G01N29/024 ,  G01N29/42 ,  G01N2291/011 ,  G01N2291/02425 ,  G01N2291/02836 ,  G01N2291/044 ,  G01N2291/051 ,  G01N2291/105 ,  G01N2291/106

Abstract: A multi-probe system for real-time measurement of a fluid level in a pipe with steady-state and turbulent flow conditions is presented. The multi-probe system includes a plurality of multiplexed transducers attached in a non-destructive fashion to walls of the pipe. Multiplexing of the transducers activate and deactivate the transducers in sequence to generate independent pairs of transmit and receive wave signals through the pipe. Each transmit and receive signal pair can be used to independently establish a time-of-flight from the transducer and back to the transducer as reflected by a surface of the fluid. The transducers can be arranged as longitudinal and/or circumferential arrays on the walls of the pipe. An algorithm that determines the time-of-flight eliminates received signals having an energy level lower than or equal to a predefined minimum energy level and eliminates any time-of-flight that is shorter than a minimum threshold time.

公开(公告)号：US20170252058A1

公开(公告)日：2017-09-07

申请号：US15218979

申请日：2016-07-25

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY ,  PLACIDUS LLC

Inventor： Yoseph BAR-COHEN ,  Stewart SHERRIT ,  Hyeong Jae LEE ,  Mircea BADESCU ,  Xiaoqi BAO ,  Yoseph SHALEV ,  Joshua LEAVITT

IPC: A61B17/3207 ,  A61B17/32

CPC classification number: A61B17/22012 ,  A61B2017/22015 ,  A61B2017/22079 ,  A61B2017/22094 ,  A61B2017/32007 ,  A61B2017/32008 ,  A61B2017/320098

Abstract: An arterial blockage percussive drill having a guiding sleeve, a drilling wire slidably coupled to the guiding sleeve and a percussive actuator coupled to the drilling wire to longitudinally oscillate the drilling wire into an arterial blockage.