Patents by Inventor Nai Ho Cheung

Nai Ho Cheung 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).

  • Method and apparatus for measuring amount of material removed from target in pulsed laser ablation
    Patent number: 8671759
    Abstract: A method for measuring the amount of material removed from a target in pulsed laser ablation is provided. The method includes generating a laser beam with a laser generator for ablating the target; driving the laser generator with a delay generator; acquiring the acoustic signal generated when the target is being ablated by the laser beam and generating an electrical signal accordingly with a microphone; amplifying the electrical signal generated by the microphone with a pre-amplifier; displaying an acoustic waveform indicating the intensity of the acoustic signal generated when the target is being ablated by the laser beam with a digital oscilloscope connected to the delay generator and the pre-amplifier; and deducing the amount of material removed from the target in the pulsed laser ablation according to the acoustic waveform in real time. An apparatus for performing the method is also provided.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: March 18, 2014
    Assignee: Hong Kong Baptist University
    Inventors: Yue Cai, Po Chun Chu, Nai Ho Cheung
  • Method And Apparatus For Measuring Amount Of Material Removed From Target In Pulsed Laser Ablation
    Publication number: 20130025373
    Abstract: A method for measuring the amount of material removed from a target in pulsed laser ablation is provided. The method includes generating a laser beam with a laser generator for ablating the target; driving the laser generator with a delay generator; acquiring the acoustic signal generated when the target is being ablated by the laser beam and generating an electrical signal accordingly with a microphone; amplifying the electrical signal generated by the microphone with a pre-amplifier; displaying an acoustic waveform indicating the intensity of the acoustic signal generated when the target is being ablated by the laser beam with a digital oscilloscope connected to the delay generator and the pre-amplifier; and deducing the amount of material removed from the target in the pulsed laser ablation according to the acoustic waveform in real time. An apparatus for performing the method is also provided.
    Type: Application
    Filed: July 28, 2011
    Publication date: January 31, 2013
    Inventors: Yue CAI, Po Chun Chu, Nai Ho Cheung