Patents by Inventor Hannah Alpert

Hannah Alpert 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).

  • Omega and theta—a method to measure magnetic field at AC frequencies without using current spinning
    Patent number: 11940505
    Abstract: We use the AC Hall effect to characterize a magnetic field at an unknown frequency (or frequencies). The current to the Hall sensor is driven at a known frequency f. The output Hall voltage is characterized in a frequency range from f1 to f2 (with f<f1<f2 and f2?f1<2f). This provides a measurement of the magnetic field in a frequency range from f1?f to f2?f. The resulting measurement of magnetic field spectral components is phase-independent and requires no prior knowledge of exact magnetic field frequency.
    Type: Grant
    Filed: May 27, 2022
    Date of Patent: March 26, 2024
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Anand Vikas Lalwani, Ananth Saran Yalamarthy, Maximillian Holliday, Hannah Alpert, Carla Nicole Pinzon, Debbie G. Senesky
  • Omega and theta - a method to measure magnetic field at AC frequencies without using current spinning
    Publication number: 20220390532
    Abstract: We use the AC Hall effect to characterize a magnetic field at an unknown frequency (or frequencies). The current to the Hall sensor is driven at a known frequency f. The output Hall voltage is characterized in a frequency range from f1 to f2 (with f<f1<f2 and f2?f1<2f). This provides a measurement of the magnetic field in a frequency range from f1?f to f2?f. The resulting measurement of magnetic field spectral components is phase-independent and requires no prior knowledge of exact magnetic field frequency.
    Type: Application
    Filed: May 27, 2022
    Publication date: December 8, 2022
    Inventors: Anand Vikas Lalwani, Ananth Saran Yalamarthy, Maximillian Holliday, Hannah Alpert, Carla Nicole Pinzon, Debbie G. Senesky
  • No-switching AC magnetic hall-effect measurement method
    Patent number: 11035912
    Abstract: We provide a Hall effect sensor driven with an AC current where the output Hall signal component is at the second harmonic. More specifically, the drive current is at fA and the relevant Hall signal frequency component is at 2fA. The resulting measurement is of the magnetic field strength at fA. This eliminates the need for switching to suppress the parasitic offset signal. This approach also leads to suppression of the induced signal caused in the Hall sensor by the time varying magnetic field.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: June 15, 2021
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Ananth Saran Yalamarthy, Anand Vikas Lalwani, Hannah Alpert, Maximillian Holliday, Saleh Kargarrazi, Debbie Senesky
  • No-switching AC magnetic Hall-effect measurement method
    Publication number: 20200348372
    Abstract: We provide a Hall effect sensor driven with an AC current where the output Hall signal component is at the second harmonic. More specifically, the drive current is at fA and the relevant Hall signal frequency component is at 2fA. The resulting measurement is of the magnetic field strength at fA. This eliminates the need for switching to suppress the parasitic offset signal. This approach also leads to suppression of the induced signal caused in the Hall sensor by the time varying magnetic field.
    Type: Application
    Filed: May 1, 2020
    Publication date: November 5, 2020
    Inventors: Ananth Saran Yalamarthy, Anand Vikas Lalwani, Hannah Alpert, Maximillian Holliday, Saleh Kargarrazi, Debbie Senesky