Multi-range time of flight sensing
First Claim
1. An electro-optical device, comprising:
- at least one laser light source configured to emit at least one beam of light pulses having an emissive power selectable between a low level and a high level;
a beam steering device configured to transmit and scan the at least one beam across a target scene;
one or more sensing elements configured to output a signal indicative of a time of incidence of a single photon on the sensing element;
light collection optics configured to image the target scene scanned by the at least one transmitted beam onto the one or more sensing elements; and
circuitry coupled to process signals output by the one or more sensing elements in order to determine respective distances to points in the target scene, to control the at least one laser light source to emit the at least one beam at the low level during a first scan of the beam steering device over the target scene, to identify, based on the first scan, the points in the scene that are located at respective distances from the device that are greater than a predefined threshold distance, and to control the at least one laser light source during a second scan of the beam steering device, subsequent to the first scan, to emit the at least one beam at the high level while the beam steering device directs the at least one beam toward the identified points.
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Accused Products
Abstract
An electro-optical device includes at least one laser light source and a beam steering device, which transmits and scan the at least one beam across a target scene. One or more sensing elements output a signal indicative of a time of incidence of a single photon on the sensing element from the target scene. Circuitry processes the signal in order to determine respective distances to points in the scene and controls the light source to emit the beam at the low level during a first scan, to identify, based on the first scan, the points in the scene that are located at respective distances from the device that are greater than a predefined threshold distance, and to control the laser light source during a second scan to emit the beam at the high level while the beam steering device directs the beam toward the identified points.
89 Citations
20 Claims
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1. An electro-optical device, comprising:
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at least one laser light source configured to emit at least one beam of light pulses having an emissive power selectable between a low level and a high level; a beam steering device configured to transmit and scan the at least one beam across a target scene; one or more sensing elements configured to output a signal indicative of a time of incidence of a single photon on the sensing element; light collection optics configured to image the target scene scanned by the at least one transmitted beam onto the one or more sensing elements; and circuitry coupled to process signals output by the one or more sensing elements in order to determine respective distances to points in the target scene, to control the at least one laser light source to emit the at least one beam at the low level during a first scan of the beam steering device over the target scene, to identify, based on the first scan, the points in the scene that are located at respective distances from the device that are greater than a predefined threshold distance, and to control the at least one laser light source during a second scan of the beam steering device, subsequent to the first scan, to emit the at least one beam at the high level while the beam steering device directs the at least one beam toward the identified points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for sensing, comprising:
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selecting a laser light source emissive power between a low level and a high level; emitting at least one beam of light pulses having a selected emissive power; transmitting and scanning the at least one beam across a target scene; providing one or more sensing elements configured to output a signal indicative of a time of incidence of a single photon on the sensing element; imaging the target scene scanned by the at least one transmitted beam onto the one or more sensing elements; controlling the at least one laser light source to emit the at least one beam at the low level during a first scan of the beam steering device over the target scene; processing signals output by the one or more sensing elements in order to determine respective distances to points in the target scene; identifying, based on the first scan, the points in the scene that are located at respective distances from the device that are greater than a predefined threshold distance; and controlling the at least one laser light source during a second scan of the beam steering device, subsequent to the first scan, to emit the at least one beam at the high level while directing the at least one beam toward the identified points. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification