Lidar system and method for detecting an object via an optical phased array

• US 8,829,417 B2
• Filed: 11/08/2011
• Issued: 09/09/2014
• Est. Priority Date: 11/08/2010
• Status: Active Grant

• Current Assignee: Johns Hopkins University
• Original Assignee: Johns Hopkins University
• Inventors: Krill, Jerry A., O'Driscoll, Michael J., Gross, Michael C., Papadakis, Stergios J., Ricciardi, Gerald F., Bankman, Isaac N., Peri, Joseph S.
• Primary Examiner(s): Legasse, Jr., Francis M
• Application Number:
  US13/291,668
• Publication Number:
  US 20120286136A1
• Time in Patent Office: 1,036 Days
• Field of Search: 250/203.1, 250/203.2, 250/203.6, 250/206, 250/559.04, 250/559.11, 250/559.12, 250/559.13, 250/559.15, 250/221, 250/222.1, 340555-557, 356/4.01, 359/1
• US Class Current: 250/221
• CPC Class Codes: G01S 17/04 Systems determining the presence of a target
• CPC Class Codes: G01S 17/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S17/46
• CPC Class Codes: G01S 17/50 Systems of measurement based on relative movement of target
• CPC Class Codes: G01S 17/66 Tracking systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 7/4813 Housing arrangements
• CPC Class Codes: G01S 7/4816 of receivers alone
• CPC Class Codes: G01S 7/4817 relating to scanning
• CPC Class Codes: G02F 1/292 by controlled diffraction or phased-array beam steering controlled diffraction for optical switching G02F1/31

Abstract

A device for detecting a presence of an object includes an optical phased array, a detector, a processing portion and an indicator. The optical phased array can transmit a first optical beam to a first location at a first time and can transmit a second optical beam to a second location at a second time. The detector can detect a first reflected beam based on the first optical beam and can detect a second reflected beam based on the second optical beam. The processing portion can determine the presence of the object based on the first reflected beam and the second reflected beam. The indicator can generate an indicator signal based on the presence of the object.

Claims

1. A device for detecting a presence of an object, said device comprising:

an optical phased array operable to transmit a first optical beam to a first location at a first time and to transmit a second optical beam to a second location at a second time;

a detector operable to detect a first reflected beam based on the first optical beam and to detect a second reflected beam based on the second optical beam;

a processing portion operable to determine the presence of the object based on the first reflected beam and the second reflected beam; and

an indicator operable to generate an indicator signal based on the presence of the object,

wherein said optical phased array is further operable to transmit an information optical beam to a third location at a third time, and wherein the information optical beam includes information based on the indicator signal.

2. The device of claim 1, wherein said optical phased array is further operable to transmit a fourth optical beam to a fourth location at a fourth time, and wherein the first location, the second location and the fourth location are disposed in a line.

3. The device of claim 2, wherein said optical phased array is further operable to transmit a fifth optical beam to a fifth location at a fifth time, a sixth optical beam to a sixth location at a sixth time, and a second optical beam to a seventh location at a seventh time, and wherein the fifth location, the sixth location and the seventh location are disposed in a second line.

4. A device for detecting a presence of an object, said device comprising:

an optical phased array operable to scan a first plurality of points at a first time and to scan along a second plurality of points at a second time;

a detector operable to detect a first set of reflected beams based on the first plurality of points and to detect a second set of reflected beams based on the second plurality of points; and

a processing portion operable to determine the presence of the object at the second time based on the first reflected beams and the second reflected beams,

wherein, when said processing portion determines the presence of the object at the second time, said processing portion is further operable to instruct said optical phased array to scan along a third plurality of points at a third time, and wherein the third plurality of points is greater in number than the first plurality of points,

wherein said optical phased array is further operable to transmit an information optical beam to a fourth location at another time, and wherein the information optical beam includes information based on an indicator signal generated based on the presence of the object.

5. The device of claim 4, wherein said processing portion is further operable to instruct said optical phased array to scan along the third plurality of points such that the third plurality of points cover a smaller area than the first plurality of points.

6. The device of claim 5, wherein said optical phased array is further operable to scan along a fourth plurality of points at a fourth time, wherein said detector is further operable to detect a third set of reflected beams based on the third plurality of points and to detect a fourth set of reflected beams based on the fourth plurality of points, wherein said processing portion is further operable to track a vector of the object at the fourth time based on the third reflected beams and the second reflected beams.