Patents by Inventor Alexandre Zybin

Alexandre Zybin 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).

  • Spectroscopic method with double modulation
    Patent number: 5640245
    Abstract: To improve the signal-to-noise ratio in trace analysis in gases or plasmas (3) by absorption spectroscopy the wavelength of the analyzing beam of a semiconductor laser (1) is modulated by a frequency f.sub.1 and the absorption length or population density of absorbing particles of the plasma is modulated by a frequency f.sub.2. For the measurement a lock-in amplifier (5) coupled to a photodiode (4) is tuned to the sum or difference frequency of the frequencies f.sub.1 and f.sub.2 or whole-number multiples thereof.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: June 17, 1997
    Assignee: LaserSpec Analytik GmbH
    Inventors: Alexandre Zybin, Christoph Schnurer-Patschan, Kay Niemax