Patents by Inventor Lars A. Ericsson

Lars A. Ericsson 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: 6115112
    Abstract: The invention relates to a method and device for measuring distances through the atmosphere against a target through propagation time measuring. Measuring light signals are transmitted towards a target and light pulses reflected by the target are received. The distance measuring includes a coarse measuring procedure and a fine measuring procedure. During the coarse measuring procedure at least one time point is fixed after which the measuring signal from the target can be expected to appear. During the fine measuring procedure a number of measurements are performed. The signal information collection during the fine measuring procedure takes place in a matching time space after the time point fixed during the coarse measuring. Preferably, the measuring during the coarse measuring procedure takes place with one or a few measuring pulses and measuring during the fine measuring procedure with a number of measuring light pulses.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: September 5, 2000
    Assignee: Spectra Precision AB
    Inventors: N. P. Mikael Hertzman, Leif K-G Andersson, Lars A. Ericsson
  • Patent number: 4521973
    Abstract: An electronic level includes a conductive gravity-levelled reference element (33) and one or more pairs of sensing electrode members (A1-D1) supported in spaced confronting relation to the reference element on a flat rigid support (37) which is movable relative to the reference element. A dielectric fluid separates the reference element (2) from the sensing electrode members so that at least one pair of capacitors is formed the capacitances of which capacitors vary oppositely in response to deviation from level position of a line joining the pair of sensing electrode members and the consequent loss of parallelism of that line with the reference element. Alternating voltages are applied to the capacitors such that the product of the capacitance and the applied voltage is equal for both capacitors when parallelism exists. A detecting means senses variations of the capacitances and provides an indication of any deviation from level position of the flat support (37).
    Type: Grant
    Filed: May 11, 1983
    Date of Patent: June 11, 1985
    Assignee: Getronics AB
    Inventors: Klas R. Wiklund, Lars A. Ericsson
  • Patent number: 4229102
    Abstract: A method and apparatus are provided for balancing out interference caused by stray coupling between the internal circuits of a distance measuring apparatus of the phase-type in a simple manner which produces a substantial increase of the usable measuring range. At least two groups of mutually separate distance measurements are performed, with each group including at least one measurement operation. For each pair of groups of distance measurements, one measuring group is effected with the transmitter signal in a first phase and the other measuring group is effected with the transmitter unit of the transmitter section supplied with a transmitter signal in a second phase which is displaced substantially 180.degree. relative to the first phase. The mean value or the mean values of the measuring results in each measurement group are thereafter formed, with this calculation being made either by hand or automatically.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: October 21, 1980
    Assignee: AGA Aktiebolag
    Inventors: Klas R. Wiklund, Lars A. Ericsson