Peter D Van Dorn
Accountancy at 13 St, Boulder, CO
License number
Colorado 2352
Issued Date
Mar 26, 1971
Renew Date
Jun 1, 2002
Expiration Date
May 31, 2004
Type
Certified Public Accountant
Address
Address
1966 13Th St STE 250, Boulder, CO 80302
Professional information
Chopped Laser Driver For Low Noise Applications
US Patent:
6674774, Jan 6, 2004
Filed:
May 10, 2000
Appl. No.:
09/569084
Inventors:
Peter Joseph Van Laanen - Boulder CO
Assignee:
Infineon Technologies North America Corp. - San Jose CA
International Classification:
H01S 300
US Classification:
372 3802, 372 3807, 331 57
Abstract:
A circuit ( ) for driving a laser diode ( ) includes a fixed current source ( ), a programmable current source ( ), a differential output driver ( ), a phase splitter ( ), and a ring oscillator ( ). The fixed current source ( ) is always coupled to the laser diode ( ) and supplies a few milliamperes (well below the current required to make the diode lase) in order to maintain forward voltage on the laser ( ). The programmable current source ( ) is alternately coupled to the anode ( ) and the cathode ( ) of the laser diode ( ) by the differential output driver ( ) in response to signals from the phase splitter ( ). The phase splitter ( ) changes phase at a frequency controlled by the ring oscillator ( ). According to a presently preferred embodiment, a 25% duty cycle in the ring oscillator ( ) keeps the laser diode ( ) ON for 75% of the time. The frequency of the laser diode ( ) is nominally 300-500 Mhz.
System And Method For Creating And Utilizing A Sinusoidal Based Pattern Sensor To Achieve Precise Positioning Of A Movable Element
US Patent:
5949066, Sep 7, 1999
Filed:
Feb 24, 1997
Appl. No.:
8/805108
Inventors:
James Patrick Rice - Lafayette CO
David Martin Perry - Lafayette CO
Curtis Alan Shuman - Colorado Springs CO
Peter Joseph Van Laanen - Boulder CO
David Martin Perry - Lafayette CO
Curtis Alan Shuman - Colorado Springs CO
Peter Joseph Van Laanen - Boulder CO
Assignee:
O.R. Technology, Inc. - Boulder CO
International Classification:
G01D 534, G11B 700
US Classification:
25023113
Abstract:
A position sensor and a method of creating the same which sensor has an incoherent light source, multiple light detectors and a sinusoidal pattern that can be directly installed to the sensor. The light source and detectors are positioned along the axis of motion of the element whose position is to be determined. In a device containing such a movable target element, light from the sensor is directed through the sinusoidal pattern to and reflected from a periodic reflection profile to create detectable sinusoid signals that can be used for positioning purposes.
Ultrasonic Scanner
US Patent:
4241608, Dec 30, 1980
Filed:
Jan 24, 1978
Appl. No.:
5/871785
Inventors:
Raymond K. Dees - Westminster CO
Peter J. Van Laanen - Boulder CO
Gregory L. Ream - Boulder CO
Peter J. Van Laanen - Boulder CO
Gregory L. Ream - Boulder CO
Assignee:
Unirad Corporation - Denver CO
International Classification:
G01N 2900
US Classification:
73606
Abstract:
An ultrasonic transducer system comprising a transducer array, control circuit and display system wherein the control system is able to actuate the transducer elements in groups of N and N+1 elements, actuate the groups in non-sequential order, actuate groups of selectively different sizes, subject the actuation signals to and the echo signals from the transducers to pre-programmable delay periods, compress the echo signals into a logarithmic representation, transform the echo signals into plural simultaneous visual displays on a standard TV monitor in split screen format, and transform the display of discrete points in the visual display into continuous lines. Further, each transducer element in the array may consist of a split or paired set of transducers.