公开(公告)号：US20110018506A1

公开(公告)日：2011-01-27

申请号：US12918589

申请日：2009-02-23

申请人： Laurent Lamesch

发明人： Laurent Lamesch

IPC分类号： G05F1/59

CPC分类号： H03K17/165 ,  H02M3/158 ,  H02M7/53873 ,  H02M2001/0045 ,  H02P7/04

摘要： A H-bridge circuit for supplying a load with a defined current comprises a first transistor for coupling a first terminal of the load to a positive potential of a power source; a second transistor for coupling the first terminal of the load to a negative potential of the power source; a third transistor for coupling a second terminal of the load to the positive potential of the power source; and a fourth transistor for coupling the second terminal of the load to the negative potential of the power source. The circuit further comprises a current sensing circuitry for sensing a current flowing through the load and for generating a voltage signal representative of the current, and a control circuit for individually controlling the operation of the first, second, third and fourth transistors by respective first, second, third and fourth control signals. The control circuit is configured for operating two transistors of the first, second, third and fourth transistors in switching mode and the remaining two transistors in linear mode. Each of the linear mode transistors has a feedback circuit associated therewith, which is operatively coupled to the control circuit and to the current sensing circuitry. Each such feedback circuit comprises a resistive element coupled between the gate/base of the associated linear mode transistor and the power source. The feedback circuits comprise a feedback transistor coupled between the gate/base of the associated linear mode transistor and the current sensing circuitry, the base/gate of the feedback transistor being connected to the control circuit for receiving the control signal for the associated linear mode transistor. The feedback transistor controls the voltage on the gate/base of the associated linear mode transistor so that a difference between the voltage signal of said current sensing circuitry and the respective control signal from said control circuit is maintained at a constant level

公开(公告)号：US07462808B2

公开(公告)日：2008-12-09

申请号：US11500266

申请日：2006-08-07

申请人： Felix Lustenberger ,  Thierry Oggier ,  Guido Becker ,  Laurent Lamesch

发明人： Felix Lustenberger ,  Thierry Oggier ,  Guido Becker ,  Laurent Lamesch

IPC分类号： G01N21/00 ,  G01S17/00

CPC分类号： G01S17/36 ,  G01S7/497 ,  G01S17/89

摘要： The method serves for canceling errors caused by mismatch of different signal paths in a photodetector with a plurality (k) of storage elements for the photogenerated signals, as typically used in phase-measurement systems. The signal-capturing process is performed in at least two measurement cycles (j) . A first cycle (j=1) is executed with the conventional setup with no phase delay in the control signals. It is followed by further measurement cycles (j=2, 3, 4) which use control signals shifted by a constant phase shift (90°). Corresponding signals are read out through different signal paths. At the end, the signals corresponding to a certain phase (Φ) are added, thus canceling possible offset values.

摘要翻译： 该方法用于消除由具有用于光生信号的多个（k）个存储元件的光电检测器中不同信号路径引起的误差，如通常在相位测量系统中使用的那样。 信号捕获处理在至少两个测量周期（j）中进行。 第一个周期（j = 1）在传统的设置中执行，在控制信号中没有相位延迟。 随后进一步的测量周期（j = 2,3,4），其使用以恒定相移（90°）移位的控制信号。 相应的信号通过不同的信号路径读出。 最后，添加与特定相位（Phi）对应的信号，从而取消可能的偏移值。

公开(公告)号：US20080239280A1

公开(公告)日：2008-10-02

申请号：US12066318

申请日：2006-09-01

申请人： Claude Watgen ,  Laurent Lamesch

发明人： Claude Watgen ,  Laurent Lamesch

IPC分类号： G01C3/08

CPC分类号： G01S17/36 ,  G01S17/89

摘要： “A method for 3D imaging of an actively illuminated target region includes emitting intensity-modulated light at a variable modulation frequency into the target region, the emitted light is scattered/reflected in the target region depending on the optical properties of the objects or beings present therein, a scattered and/or reflected fraction of the light is detected during an integration time interval by phase-sensitive integration in each pixel of an imaging sensor, the modulation phase between the emitted and the detected light is determined and spatially resolved, and distance information is calculated based on the spatially resolved modulation phase and an average frequency of the modulation frequency.”

摘要翻译： “用于主动照射的目标区域的3D成像的方法包括以可变的调制频率向目标区域发射强度调制的光，根据存在的物体或存在的物体的光学特性，发射的光在目标区域中被散射/反射 其中，通过在成像传感器的每个像素中的相敏积分在积分时间间隔期间检测光的散射和/或反射分数，确定发射光和检测光之间的调制相位并在空间上分辨距离 基于空间分辨的调制相位和调制频率的平均频率来计算信息。