Patents by Inventor Shyh-Shiuh Lih
Shyh-Shiuh Lih has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10605784Abstract: 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.Type: GrantFiled: January 23, 2017Date of Patent: March 31, 2020Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Yoseph Bar-Cohen, Mircea Badescu, Shyh-Shiuh Lih, Stewart Sherrit, Nobuyuki Takano, Patrick N. Ostlund, Hyeong Jae Lee, Xiaoqi Bao
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Patent number: 10578480Abstract: 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.Type: GrantFiled: April 19, 2018Date of Patent: March 3, 2020Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Yoseph Bar-Cohen, Shyh-Shiuh Lih, Hyeong Jae Lee, Mircea Badescu
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Publication number: 20180306633Abstract: 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.Type: ApplicationFiled: April 19, 2018Publication date: October 25, 2018Inventors: Yoseph BAR-COHEN, Shyh-Shiuh LIH, Hyeong Jae LEE, Mircea BADESCU
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Publication number: 20170131241Abstract: 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.Type: ApplicationFiled: January 23, 2017Publication date: May 11, 2017Inventors: Yoseph BAR-COHEN, Mircea BADESCU, Shyh-Shiuh LIH, Stewart SHERRIT, Nobuyuki TAKANO, Patrick N. OSTLUND, Hyeong Jae LEE, Xiaoqi BAO
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Patent number: 9586234Abstract: 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.Type: GrantFiled: April 23, 2014Date of Patent: March 7, 2017Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Yoseph Bar-Cohen, Mircea Badescu, Shyh-Shiuh Lih, Stewart Sherrit, Nobuyuki Takano, Patrick N. Ostlund, Hyeong Jae Lee, Xiaoqi Bao
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Patent number: 9404891Abstract: A system and method for monitoring the properties of a fluid, such as water, in a steam pipe without mechanically penetrating the wall of the pipe. The system uses a piezoelectric transducer to launch an ultrasonic probe signal into the pipe. Reflected ultrasonic signals are captured in a transducer, which can be the same transducer that launched the probe signal. The reflected signals are subjected to data processing, which can include filtering, amplification, analog-to-digital conversion and autocorrelation analysis. A result is extracted which is indicative of a property of the fluid, such as a height of the condensed fluid, a cavitation of the condensed fluid, and a surface perturbation of the condensed fluid. The result can be recorded, displayed, and/or transmitted to another location. One embodiment of the system has been constructed and tested based on a general purpose programmable computer using instructions recorded in machine-readable non-volatile memory.Type: GrantFiled: December 17, 2013Date of Patent: August 2, 2016Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Shyh-Shiuh Lih, Hyeong Jae Lee, Yoseph Bar-Cohen, Xiaoqi Bao
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Publication number: 20140312739Abstract: 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.Type: ApplicationFiled: April 23, 2014Publication date: October 23, 2014Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Yoseph Bar-Cohen, Mircea Badescu, Shyh-Shiuh Lih, Stewart Sherrit, Nobuyuki Takano, Patrick N. Ostlund, Hyeong Jae Lee, Xiaoqi Bao
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Publication number: 20140107954Abstract: A system and method for monitoring the properties of a fluid, such as water, in a steam pipe without mechanically penetrating the wall of the pipe. The system uses a piezoelectric transducer to launch an ultrasonic probe signal into the pipe. Reflected ultrasonic signals are captured in a transducer, which can be the same transducer that launched the probe signal. The reflected signals are subjected to data processing, which can include filtering, amplification, analog-to-digital conversion and autocorrelation analysis. A result is extracted which is indicative of a property of the fluid, such as a height of the condensed fluid, a cavitation of the condensed fluid, and a surface perturbation of the condensed fluid. The result can be recorded, displayed, and/or transmitted to another location. One embodiment of the system has been constructed and tested based on a general purpose programmable computer using instructions recorded in machine-readable non-volatile memory.Type: ApplicationFiled: December 17, 2013Publication date: April 17, 2014Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Shyh-Shiuh LIH, Hyeong Jae LEE, Yoseph BAR-COHEN, Xiaoqi BAO
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Patent number: 8632244Abstract: A system and method for monitoring the properties of a fluid, such as water, in a steam pipe without mechanically penetrating the wall of the pipe. The system uses a piezoelectric transducer to launch an ultrasonic probe signal into the pipe. Reflected ultrasonic signals are captured in a transducer, which can be the same transducer that launched the probe signal. The reflected signals are subjected to data processing, which can include filtering, amplification, analog-to-digital conversion and autocorrelation analysis. A result is extracted which is indicative of a property of the fluid, such as a height of the condensed fluid, a cavitation of the condensed fluid, and a surface perturbation of the condensed fluid. The result can be recorded, displayed, and/or transmitted to another location. One embodiment of the system has been constructed and tested based on a general purpose programmable computer using instructions recorded in machine-readable non-volatile memory.Type: GrantFiled: March 9, 2011Date of Patent: January 21, 2014Assignee: California Institute of TechnologyInventors: Yoseph Bar-Cohen, Shyh-Shiuh Lih, Mircea Badescu, Xiaoqi Bao, Stewart Sherrit, James Samson Scott, Julian O. Blosiu, Scott E. Widholm
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Publication number: 20110222577Abstract: A system and method for monitoring the properties of a fluid, such as water, in a steam pipe without mechanically penetrating the wall of the pipe. The system uses a piezoelectric transducer to launch an ultrasonic probe signal into the pipe. Reflected ultrasonic signals are captured in a transducer, which can be the same transducer that launched the probe signal. The reflected signals are subjected to data processing, which can include filtering, amplification, analog-to-digital conversion and autocorrelation analysis. A result is extracted which is indicative of a property of the fluid, such as a height of the condensed fluid, a cavitation of the condensed fluid, and a surface perturbation of the condensed fluid. The result can be recorded, displayed, and/or transmitted to another location. One embodiment of the system has been constructed and tested based on a general purpose programmable computer using instructions recorded in machine-readable non-volatile memory.Type: ApplicationFiled: March 9, 2011Publication date: September 15, 2011Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGYInventors: Yoseph BAR-COHEN, Shyh-Shiuh Lih, Mircea Badescu, Xiaoqi Bao, Stewart Sherrit, James Samson Scott, Julian O. Blosiu, Scott E. Widholm
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Patent number: 6092421Abstract: A system which rapidly determines the elastic stiffness constants of materials in plate shape as well as characterize material flaws that are affecting these constants. Rapid (below a minute) nondestructive evaluation system allow for the determination of material stiffness constants, low noise data acquisition algorithm for measuring spectral data. A real time method of displaying leaky Lamb wave spectral data.Type: GrantFiled: August 28, 1998Date of Patent: July 25, 2000Assignee: California Institute of TechnologyInventors: Yoseph Bar-Cohen, Shyh-Shiuh Lih
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Patent number: 5961298Abstract: A traveling wave pump which employs one or more pairs of interfacing plates to transfer fluid (gas or liquid) from one or more inlets to one or more outlets. At least one of the plates in each pair of interfacing plates is driven so as to produce a flexure traveling wave therein. Actuators incorporating electroactive elements are used to drive the driven plates and create the flexure traveling wave. This wave causes chambers to form between the interfacing plates which move from one end of the driven plate to the other in the direction of the wave. Fluid is drawn into a forming chamber, and eventually the forming chamber closes trapping the fluid therein. The fluid is then transported through the pump by the now completely formed chamber as it propagates along the plate interface. If only one of the interfacing plates is driven, the other remains fixed in that no chambers are formed at its surface.Type: GrantFiled: June 25, 1996Date of Patent: October 5, 1999Assignee: California Institute of TechnologyInventors: Yoseph Bar-Cohen, Benjamin Joffe, Shyh-Shiuh Lih
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Patent number: 5909965Abstract: A linear recirculation path unit for a roller bearing includes a linear loading passage, a linear unloading passage, and two direction reversing passages connected to the ends of the linear passages. Instead of simply designing the reversing passages so that the slopes or tangents of the linear and reversing passages are continuous at the connecting points, the reversing passages are arranged so that not only the slopes but also the curvatures of the linear and reversing passages vary continuously throughout the recirculation path, thereby reducing centrifugal acceleration of the rolling elements in the path, with consequent reductions in impact forces on walls of the passages, sliding function, and vibration induced noises.Type: GrantFiled: September 12, 1997Date of Patent: June 8, 1999Assignee: Hiwin Technologies Corp.Inventors: Kou-I Szu, Kuo-Jung Chang, Shyh-Shiuh Lih, Wu-Chang Hsu