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：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：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.

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：US20170298709A1

公开(公告)日：2017-10-19

申请号：US15486221

申请日：2017-04-12

Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY

Inventor： Mircea BADESCU ,  Stewart SHERRIT ,  Xiaoqi BAO ,  Yoseph BAR-COHEN ,  Jeffery L. HALL

IPC: E21B34/14 ,  F16K1/12

CPC classification number: E21B34/14 ,  E21B43/12 ,  F16K1/12 ,  F16K31/04 ,  F16K35/02

Abstract: A valve that allows control of each of one or more flow paths using one actuator is presented. Rotary motion of a motor is transformed into linear motion using a roller screw mechanism. The travel of the roller screw nut is predefined between front and back hard stops that prevent the roller screw from rotating when the stops are reached. A poppet is attached to the nut using a flexible connection where a spring is compressed. The nut also drives a sleeve with inclined surfaces that moves relative to a locking flexure. When the sleeve is driven by the nut toward closing the valve, the sleeve deforms flanges of the locking flexure causing a cantilever end finger of the flexure to move radially and prevent the poppet from being pushed back. If the sleeve is moved farther in the direction of valve closing, a groove on the sleeve engages notches on the fingers creating a detent that prevents the spring to push the sleeve back.