Patents by Inventor Siu Lau Ho
Siu Lau Ho 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).
-
Patent number: 8861973Abstract: A railway monitoring system firstly includes an optical fiber. A first part of the fiber is attachable to one of a pair of tracks of a rail, and a characteristic of the first part of the fiber is variable in correspondence to variance of a characteristic of said one track where the first part of fiber is attached. The system also includes an optical signal emitter connected to the fiber for emitting an optical signal into the fiber, and the fiber generates at least a first altered optical signal, which contains information relating to the variance of the characteristic of the part of the fiber. The system further includes an optical signal analyzer connected to the fiber for receiving and analyzing the first altered optical signal so as to ascertain the variance of said characteristic of said one track based upon the information contained in the first altered optical signal.Type: GrantFiled: March 25, 2005Date of Patent: October 14, 2014Assignee: The Hong Kong Polytechnic UniversityInventors: Hwa Yaw Tam, Siu Lau Ho, Michael Shun Yee Liu
-
Patent number: 8282276Abstract: A mount (20) for a temperature-compensated fiber optic strain gauge (10), the mount (20) comprising: a void (19) located at a middle portion of the mount (20) to separate the mount (20) into a first section (17) and a second section (18); and removable bridges (24) to connect the first section (17) to the second section (18); wherein after the mount (20) has been operatively attached to a host structure (5), the removable bridges (24) are removed.Type: GrantFiled: August 5, 2010Date of Patent: October 9, 2012Assignee: MTR Corporation LimitedInventors: Hwa Ywa Tam, Siu Lau Ho, Shun Yee Liu, Kang Kuen Lee, Tony Kar Yun Lee, Chun Cheong Hon, Hing Keung Chan, Aiken Yiu Ming Tam
-
Publication number: 20120212085Abstract: An axial-flux electric motor includes a stator having a plurality of stator windings and a plurality of stator pole-pairs, a first rotor configured to magnetically interact with the stator in an axial direction, the first rotor is positioned on one side of the stator, having a plurality of permanent magnets embedded thereon with a plurality of rotor pole-pairs, a second rotor configured to magnetically interact with the stator in the axial direction, the second rotor is position on another side of the stator, having a plurality of permanent magnets embedded thereon with a plurality of rotor pole-pairs, and a plurality of stationary ferromagnetic segments, positioned between the stator and the first rotor and between the stator and the second rotor, the ferromagnetic segments are adapted to modulate magnetic field of the permanent magnets in the axial direction.Type: ApplicationFiled: February 17, 2011Publication date: August 23, 2012Applicant: THE HONG KONG POLYTECHNIC UNIVERSITYInventors: Weinong Fu, Siu-lau Ho
-
Publication number: 20110188537Abstract: A mount (20) for a temperature-compensated fibre optic strain gauge (10), the mount (20) comprising: a void (19) located at a middle portion of the mount (20) to separate the mount (20) into a first section (17) and a second section (18); and removable bridges (24) to connect the first section (17) to the second section (18); wherein after the mount (20) has been operatively attached to a host structure (5), the removable bridges (24) are removed.Type: ApplicationFiled: August 5, 2010Publication date: August 4, 2011Inventors: Hwa Ywa Tam, Siu Lau Ho, Shun Yee Liu, Kang Kuen Lee, Tony Kar Yun Lee, Chun Cheong Hon, Hing Keung Chan, Aiken Yiu Ming Tam
-
Patent number: 7796844Abstract: A temperature-compensated fibet optic strain gauge (10) for measuring strain of a host structure (5), the strain gauge (10) comprising: a mount (20) having a void (19) separating a first section (17) from a second section (18); a first fiber Bragg grating (FBG) (30); a second fiber Bragg grating (FBG) (40); and removable bridging portions (24) adjacent to the void (19) to connect the first section (17) to the second section (18), the bridging portions (24) being removed after the mount (20) is operatively attached to the host structure (5); wherein a right-side failure proof feature is provided by detecting whether a reflection wavelength reverts to an original Bragg wavelength of the first FBG (40) to indicate whether the first FBG (40) has broken.Type: GrantFiled: July 22, 2008Date of Patent: September 14, 2010Assignees: The Hong Kong Polytechnic University, Mass Transit Railway Corporation LimitedInventors: Hwa Ywa Tam, Siu Lau Ho, Shun Yee Liu, Kang Kuen Lee, Tony Kar Yun Lee, Chun Cheong Hon, Hing Keung Chan, Aiken Yiu Ming Tam
-
Publication number: 20100021106Abstract: A temperature-compensated fibre optic strain gauge (10) for measuring strain of a host structure (5), the strain gauge (10) comprising: a mount (20) to be operatively attached to the host structure (5), the mount (20) having a void (19) separating a first section (17) of the mount (20) from a second section (18) of the mount (20); a first fiber Bragg grating (FBG) (30) recorded within a core of an optical fiber (11) to measure strain and temperature, the first FBG (30) being located transverse to the void (19) and a first end portion of the first FBG (30) is operatively attached to the first section (17) of the mount (20) and a second end portion of the first FBG (30) is operatively attached to the second section (18) of the mount (20), the end portions of the first FBG (30) being pre-strained by an amount larger than a predetermined operational range of the first FBG (30); a second fiber Bragg grating (FBG) (40) recorded within the core of the optical fiber (11) to measure temperature, the temperature measurType: ApplicationFiled: July 22, 2008Publication date: January 28, 2010Applicants: The Hong Kong Polytechnic University, Mass Transit Railway Coporation LimitedInventors: Hwa Ywa TAM, Siu Lau Ho, Shun Yee Liu, Kang Kuen Lee, Tony Kar Yun Lee, Chun Cheong Hon, Hing Keung Chan, Aiken Yiu Ming Tam
-
Publication number: 20080315684Abstract: The present invention relates a dynamic voltage restorer (DVR) system and methods for addressing voltage dips. The instant DVR incorporates high frequency technology, such as a high frequency transformer, to generate a square wave voltage from a storage device, such square wave being modulated prior to being delivered to a load. The generation of the square wave and modulation thereto creates a voltage that reacts fast to voltage dips, while addressing wide ranging harmonics usually present in square waves.Type: ApplicationFiled: June 25, 2007Publication date: December 25, 2008Applicant: The Hong Kong Polytechnic UniversityInventors: Eric Ka Wai Cheng, Siu Lau Ho, Kit Po Wong
-
Publication number: 20080019701Abstract: A railway monitoring system firstly includes an optical fiber. A first part of the fiber is attachable to one of a pair of tracks of a rail, and a characteristic of the first part of the fiber is variable in correspondence to variance of a characteristic of said one track where the first part of fiber is attached. The system also includes an optical signal emitter connected to the fiber for emitting an optical signal into the fiber, and the fiber generates at least a first altered optical signal, which contains information relating to the variance of the characteristic of the part of the fiber. The system further includes an optical signal analyzer connected to the fiber for receiving and analyzing the first altered optical signal so as to ascertain the variance of said characteristic of said one track based upon the information contained in the first altered optical signal.Type: ApplicationFiled: March 25, 2005Publication date: January 24, 2008Inventors: Hwa Yaw Tam, Siu Lau Ho, Michael Shun Yee Liu