Patents by Inventor Helmut Roehle

Helmut Roehle 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: 9625323
    Abstract: The invention relates to a method for determining the relative temporal position of electromagnetic pulses. Said method having the steps generating a sequence of first electromagnetic pulses, generating a sequence of second electromagnetic pulses, overlaying at least a part of the first and the second pulses in a saturable absorber, detecting the second pulses that have passed through the saturable absorber by means of a detector in such a manner that the second pulses, but not the first pulses that have passed through the saturable absorber, are detected, and determining the temporal position of the first pulses relative to the temporal position of the second pulses with the aid of a signal from the detector which is generated when the second pulses that have passed through the saturable absorber are received.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: April 18, 2017
    Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FÖDERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Bernd Sartorius, Roman Dietz, Helmut Roehle
  • Patent number: 9354168
    Abstract: The invention relates to a method for determining a liquid in a closed container using THz radiation, in which a first and a second measurement are carried out, wherein the THz radiation is emitted in the direction of the liquid for measuring properties of the liquid, and a portion of the THz radiation coming from the direction of the liquid is detected. In the proposed method, the closed container contains, in addition to the liquid, a gas, wherein a wall of the container is transmissive for THz radiation and wherein the detected portion of the THz radiation in the first measurement is reflected at a boundary surface between the wall and the gas or a pocket containing the gas, and the second measurement is reflected at a boundary surface between the wall and the liquid. The first measurement thus serves as a reference measurement for capturing disturbing losses in the THz beam path and for determining influences of the wall on a measurement result for the second measurement.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: May 31, 2016
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Helmut Roehle
  • Patent number: 9147789
    Abstract: A photoconductor comprising a layer stack with a semiconductor layer photoconductive for a predetermined wavelength range between two semiconductor boundary layers with a larger band gap than the photoconductive semiconductor layer on a substrate, wherein the semiconductor boundary layers comprise deep impurities for trapping and recombining free charge carriers from the photoconductive semiconductor layer, and two electrodes connected to the photoconductive semiconductor layer, for lateral current flow between the electrodes through the photoconductive semiconductor layer.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: September 29, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Harald Kuenzel, Helmut Roehle
  • Publication number: 20150253199
    Abstract: The invention relates to a method for determining the relative temporal position of electromagnetic pulses. Said method having the steps generating a sequence of first electromagnetic pulses, generating a sequence of second electromagnetic pulses, overlaying at least a part of the first and the second pulses in a saturable absorber, detecting the second pulses that have passed through the saturable absorber by means of a detector in such a manner that the second pulses, but not the first pulses that have passed through the saturable absorber, are detected, and determining the temporal position of the first pulses relative to the temporal position of the second pulses with the aid of a signal from the detector which is generated when the second pulses that have passed through the saturable absorber are received.
    Type: Application
    Filed: September 24, 2013
    Publication date: September 10, 2015
    Inventors: Bernd Sartorius, Roman Dietz, Helmut Roehle
  • Patent number: 9103774
    Abstract: A material may be identified using THz radiation that simultaneously or sequentially includes at least one first frequency portion and a second frequency portion different therefrom. An object formed from the material to be identified is irradiated with the THz radiation and the THz radiation exiting the object is detected using a phase-sensitive THz receiver. A time or phase offset, caused by the object, is measured at least for the first frequency portion and a material thickness is determined therefrom. Attenuation of the received signal, at least for the second frequency portion, is determined. An absorption coefficient for at least the second frequency portion is calculated using the material thickness.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: August 11, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Helmut Roehle, Dennis Stanze
  • Patent number: 9018646
    Abstract: A photoconductor comprising a layer stack with a semiconductor layer photoconductive for a predetermined wavelength range between two semiconductor boundary layers with a larger band gap than the photoconductive semiconductor layer on a substrate, wherein the semiconductor boundary layers comprise deep impurities for trapping and recombining free charge carriers from the photoconductive semiconductor layer, and two electrodes connected to the photoconductive semiconductor layer, for lateral current flow between the electrodes through the photoconductive semiconductor layer.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: April 28, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foederung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Harald Kuenzel, Helmut Roehle, Klaus Biermann
  • Patent number: 8975584
    Abstract: A terahertz system can be configured for producing and coherently detecting terahertz radiation. The system can comprise a laser light source and two THz antennas, a first of which is used as a transmission antenna and a second of which is used as a receiver antenna, which are each optically coupled to the laser light source by an optical fiber and can be activated by light from this laser light source, wherein the THz antennas each have a semiconductor chip to which antenna conductors have been contact-connected and which comprises at least one photosensitive active layer with a band edge wavelength which is longer than a wavelength of the laser light source and at least one layer, adjoining the active layer, with a band edge wavelength which is shorter than the wavelength of the laser light source, wherein the band edge wavelength of the active layer of at least one of the THz antennas is at least 200 nm longer than the wavelength of the laser light source.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: March 10, 2015
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Helmut Roehle, Dennis Stanze, Roman Dietz
  • Patent number: 8953937
    Abstract: The invention relates to a system for producing a signal having a variably adjustable time position or phase position, comprising at least one light source for producing a first light component (2) having a first wavelength and a second light component (2?) having a second wavelength deviating from the first wavelength and a phase modulator (5) for varying a phase of the first light component (2), wherein the system is designed to produce a beat note signal by superposing the two light components (2, 2?) and has a common optical fiber (4) for coupling in both light components (2, 2?), wherein furthermore the phase modulator (5) is arranged at an end or in the course of said optical fiber (4) and is transparent to both light components (2, 2?) and is designed to vary the phase of the first light component (2) selectively independently of a phase of the second light component (2?) or more intensely than the phase of the second light component (2?). The invention further relates to a use of such a system.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: February 10, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Helmut Roehle, Dennis Stanze
  • Patent number: 8901497
    Abstract: The present invention relates to a device for creating and coherently detecting terahertz radiation, comprising a laser light source (1), a transmission antenna (2) that can be activated by the laser light source (1) for creating the terahertz radiation, and a receiver with a receiver antenna (3) that can be activated by the same laser light source (1), wherein the transmission antenna (2) comprises a photo diode as a light-sensitive element and the receiver antenna (3) a fast photo-conductor as a light-sensitive element. The invention further relates to a use of such a device for analyzing a sample.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: December 2, 2014
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Heinz-Gunter Bach, Helmut Roehle
  • Publication number: 20140319356
    Abstract: The invention relates to a method for determining a liquid in a closed container using THz radiation, in which a first and a second measurement are carried out, wherein the THz radiation is emitted in the direction of the liquid for measuring properties of the liquid, and a portion of the THz radiation coming from the direction of the liquid is detected. In the proposed method, the closed container contains, in addition to the liquid, a gas, wherein a wall of the container is transmissive for THz radiation and wherein the detected portion of the THz radiation in the first measurement is reflected at a boundary surface between the wall and the gas or a pocket containing the gas, and in-the second measurement is reflected at a boundary surface between the wall and the liquid. The first measurement thus serves as a reference measurement for capturing disturbing losses in the THz beam path and for determining influences of the wall on a measurement result for the second measurement.
    Type: Application
    Filed: July 31, 2012
    Publication date: October 30, 2014
    Applicant: Fraunhofer-Gesellschaft zur Förderung der angewardten Forschung e.V.
    Inventors: Bernd Sartorius, Helmut Roehle
  • Publication number: 20130306869
    Abstract: A terahertz system can be configured for producing and coherently detecting terahertz radiation. The system can comprise a laser light source and two THz antennas, a first of which is used as a transmission antenna and a second of which is used as a receiver antenna, which are each optically coupled to the laser light source by an optical fibre and can be activated by light from this laser light source, wherein the THz antennas each have a semiconductor chip to which antenna conductors have been contact-connected and which comprises at least one photosensitive active layer with a band edge wavelength which is longer than a wavelength of the laser light source and at least one layer, adjoining the active layer, with a band edge wavelength which is shorter than the wavelength of the laser light source, wherein the band edge wavelength of the active layer of at least one of the THz antennas is at least 200 nm longer than the wavelength of the laser light source.
    Type: Application
    Filed: October 25, 2011
    Publication date: November 21, 2013
    Applicant: Fraunhofe-Gesellschaft zur Förderung der angewandten Forschung E.V.
    Inventors: Bernd Sartorius, Helmut Roehle, Dennis Stanze, Roman Dietz
  • Patent number: 8546762
    Abstract: Time-domain measurements are carried out using arrangements and methods. A transmitter generates electro-magnetic pulses upon receipt of pulses of an optical pulse source. A coherent detector detects the electro-magnetic pulses or an evoked electro-magnetic signal. A delay line periodically changes the optical path length between the optical pulse source and the coherent detector and/or the electro-magnetic transmitter by periodically moving an optical element of the delay line. A position sensor determines the position of the optical element and smoothes the data generated by the position sensor. The coherent detector detects the electro-magnetic signal evoked by the electro-magnetic pulses. Pulses of the optical pulse source trigger the coherent detector.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: October 1, 2013
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V.
    Inventors: Helmut Roehle, Bernd Sartorius
  • Publication number: 20130121687
    Abstract: The invention relates to a system for producing a signal having a variably adjustable time position or phase position, comprising at least one light source for producing a first light component (2) having a first wavelength and a second light component (2?) having a second wavelength deviating from the first wavelength and a phase modulator (5) for varying a phase of the first light component (2), wherein the system is designed to produce a beat note signal by superposing the two light components (2, 2?) and has a common optical fiber (4) for coupling in both light components (2, 2?), wherein furthermore the phase modulator (5) is arranged at an end or in the course of said optical fiber (4) and is transparent to both light components (2, 2?) and is designed to vary the phase of the first light component (2) selectively independently of a phase of the second light component (2?) or more intensely than the phase of the second light component (2?). The invention further relates to a use of such a system.
    Type: Application
    Filed: February 11, 2011
    Publication date: May 16, 2013
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
    Inventors: Bernd Sartorius, Helmut Roehle, Dennis Stanze
  • Publication number: 20120217403
    Abstract: A material may be identified using THz radiation that simultaneously or sequentially includes at least one first frequency portion and a second frequency portion different therefrom. An object formed from the material to be identified is irradiated with the THz radiation and the THz radiation exiting the object is detected using a phase-sensitive THz receiver. A time or phase offset, caused by the object, is measured at least for the first frequency portion and a material thickness is determined therefrom. Attenuation of the received signal, at least for the second frequency portion, is determined. An absorption coefficient for at least the second frequency portion is calculated using the material thickness.
    Type: Application
    Filed: October 25, 2010
    Publication date: August 30, 2012
    Applicant: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Bernd Sartorius, Helmut Roehle, Dennis Stanze
  • Publication number: 20120129294
    Abstract: A photoconductor comprising a layer stack with a semiconductor layer photoconductive for a predetermined wavelength range between two semiconductor boundary layers with a larger band gap than the photoconductive semiconductor layer on a substrate, wherein the semiconductor boundary layers comprise deep impurities for trapping and recombining free charge carriers from the photoconductive semiconductor layer, and two electrodes connected to the photoconductive semiconductor layer, for lateral current flow between the electrodes through the photoconductive semiconductor layer.
    Type: Application
    Filed: January 27, 2012
    Publication date: May 24, 2012
    Inventors: Bernd SARTORIUS, Harald Kuenzel, Helmut Roehle
  • Publication number: 20110057206
    Abstract: A photoconductor having a layer stack (72) with a semiconductor layer (64) photoconductive for a predetermined wavelength range between two semiconductor boundary layers (62) with a larger band gap than the photoconductive semiconductor layer (64) on a substrate (60), wherein the semiconductor boundary layers (62) have deep impurities for trapping and recombining free charge carriers from the photoconductive semiconductor layer (64), and two electrodes connected to the photoconductive semiconductor layer (64), for lateral current flow between the electrodes through the photoconductive semiconductor layer (64).
    Type: Application
    Filed: March 10, 2008
    Publication date: March 10, 2011
    Inventors: Bernd Sartorius, Harald Kuenzel, Helmut Roehle, Klaus Biermann
  • Publication number: 20110031400
    Abstract: The present invention relates to a device for creating and coherently detecting terahertz radiation, comprising a laser light source (1), a transmission antenna (2) that can be activated by the laser light source (1) for creating the terahertz radiation, and a receiver with a receiver antenna (3) that can be activated by the same laser light source (1), wherein the transmission antenna (2) comprises a photo diode as a light-sensitive element and the receiver antenna (3) a fast photo-conductor as a light-sensitive element. The invention further relates to a use of such a device for analyzing a sample.
    Type: Application
    Filed: September 12, 2008
    Publication date: February 10, 2011
    Inventors: Bernd Sartorius, Heinz-Gunter Bach, Helmut Roehle
  • Patent number: 6196251
    Abstract: Disclosed is a gas inlet device comprising a gas reservoir (5), which is connected via a supply line (11) via a supply flow restrictor (10) which can be closed by a supply valve 13). The gas can be supplied into the antechamber (5) via a control valve (6) and a control flow restrictor (4). As the control valve (6) and the supply valve (13) close the antechamber from the outside, there are only minimal fluctuations in pressure during switching. By this means the pressure in the antechamber (5) can be controlled precisely and the gas flow from the antechamber (5) into the supply line (11) can be set with great precision.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: March 6, 2001
    Assignee: AIXTRON Semiconductor Technologies GmbH
    Inventor: Helmut Roehle
  • Patent number: 4612174
    Abstract: Waste gases and other noxious substances which are formed in connection with chemical processes and the manufacture of devices such as semiconductors and covalent hydrides and element organic compounds, etc. are treated so as to remove the noxious components.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: September 16, 1986
    Assignee: Heinrich-Hertz-Institute fur Nachrichtentechnik Berlin GmbH
    Inventors: Werner Fabian, Helmut Roehle, Peter Wolfram