Device and method for measuring the position of at least one moving object in a three-dimensional grid

• US 8,619,251 B2
• Filed: 11/23/2009
• Issued: 12/31/2013
• Est. Priority Date: 11/24/2008
• Status: Expired due to Fees

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Souvestre, Florent, Hafez, Moustapha
• Primary Examiner(s): Ratcliffe, Luke D
• Assistant Examiner(s): Diacou, Ari M
• Application Number:
  US13/130,289
• Publication Number:
  US 20110228252A1
• Time in Patent Office: 1,499 Days
• Field of Search: 356/29, 356140-1415, 356/139.06
• US Class Current: 356/139.06
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01B 11/03 by measuring coordinates of points
• CPC Class Codes: G01S 17/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S17/46
• CPC Class Codes: G01S 17/48 Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/66 Tracking systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 7/4812 transmitted and received beams following a coaxial path
• CPC Class Codes: G01S 7/4813 Housing arrangements
• CPC Class Codes: G01S 7/4817 relating to scanning
• CPC Class Codes: G01S 7/491 Details of non-pulse systems
• CPC Class Codes: G01S 7/4911 Transmitters

Abstract

A device for measuring the position of at least one moving object in a three-dimensional grid. The device comprises: at least one optical head comprising an independent laser sources array outputting collimated laser beams, arranged about a central photodetector with a single sensitive cell; at least one movable base with two rotational degrees of freedom whereto said array is secured; and control electronics.

Claims

1. Device for measuring the position of at least one moving object in a three-dimensional grid, which comprises:

at least one optical head comprising an independent laser source array outputting collimated laser beams, arranged about a central photodetector with a single sensitive cell,

at least one movable base with rotational degrees of freedom whereto said array is secured,

control electronics comprising;

serial laser source switching means for tracking the object,

means for continuously adjusting the angles of the movable base to align the centre of the photodetector with the centre of the object.

2. Device according to claim 1, wherein the movable base comprises two geared motors mounted in a “

tilt/pan”

configuration.

3. Device according to claim 1, wherein the movable base comprises a universal joint type mechanical link.

4. Device according to claim 3, comprising a movable bases array.

5. Device according to claim 1, wherein the laser sources array is a VCSEL array.

6. Device according to claim 1, wherein the laser sources are laser diodes.

7. Device according to claim 1, wherein the optical head comprises:

collimated laser diodes,

a photodiode,

an analog multiplexer,

a transimpedance amplifier and inverter,

a control circuit.

8. Device according to claim 1, wherein the control electronics comprise:

a microcontroller,

a digital-analog converter,

an analog-digital converter,

a digital input/output module,

a communication module,

a regulation and power control circuit.

9. Device according to claim 1, comprising a lenses array positioned in front of the laser sources array and movable in a linear manner in front of same.

10. Method for measuring the position of at least one moving object in a three-dimensional grid using a device for measuring the position of said at least one object comprising:

at least one optical head comprising an independent laser sources array outputting collimated laser beams, arranged about a central photodetector with a single sensitive cell,

at least one movable base with two rotational degrees of freedom whereto said array is secured,

characterised in that it comprises;

a static and local scanning step with laser sources switching for tracking the object,

an overall tracking step of said at least one object performed by consulting both axes of a movable base of said array to continuously adjust the angles of said movable base in order to align the centre of the photodetector with the centre of the object.

11. Method according to claim 10, further comprising:

a step for measuring depth carried out using a time-of-flight telemetry method.

12. Method according to claim 10, wherein the array is a VCSEL array.

13. Method according to claim 10, wherein the movable base is “

tilt/pan”

type.

14. Method according to claim 10, comprising a linear movement step of a lenses array in front of the laser sources array.