US 2010/0059658 A1 · LIGHT SOURCE DETECTION DEVICE AND METHOD FOR DETECTING LIGHT SOURCE

Abstract

A light source detection device includes first photo sensors disposed on a reference plane along a first direction and a control unit. Each first photo sensor has a first sensing surface for detecting a photo intensity of a light source to output a photo intensity signal. The first sensing surfaces are back to back or face to face. An included angle between a normal vector of one of the first sensing surfaces and a normal vector of the reference plane is equal to an included angle between a normal vector of another one of the first sensing surfaces and the normal vector of the reference plane. The normal vectors are coplanar. The control unit is adapted to receive the photo intensity signals and normalize the difference of the photo intensities of the light source sensed by the first photo sensors, so as to detect a position of the light source.

Claims25

Dependent claims

A light source detection device, adapted to be disposed in an open space to detect a position of a light source, comprising:

two first photo sensors, disposed on a reference plane along a first direction, wherein each of the first photo sensors comprises a first sensing surface for detecting a photo intensity of the light source and is adapted to output a photo intensity signal, the first sensing surfaces are disposed back to back or face to face, an included angle between a normal vector of one of the first sensing surfaces and a normal vector of the reference plane is equal to an included angle between a normal vector of the other one of the first sensing surfaces and the normal vector of the reference plane, and the normal vectors are coplanar;
and
a control unit, adapted to receive the photo intensity signals, and normalize a difference of photo intensities of the light source sensed by the first photo sensors, so as to detect an angle of the light source relative to the reference plane along the first direction.

A method for detecting a light source, suitable for detecting a position of a light source in an open space, comprising:

disposing two first photo sensors on a reference plane along a first direction to form a sensing area, wherein the sensing area is defined as a range of a difference of photo intensities of the light source simultaneously sensed by the first photo sensors after normalization, each of the first photo sensors comprises a first sensing surface for detecting a photo intensity of the light source and is adapted to output a photo intensity signal, the first sensing surfaces are disposed back to back or face to face, an included angle between a normal vector of one of the first sensing surfaces and a normal vector of the reference plane is equal to an included angle between a normal vector of the other one of the first sensing surfaces and the normal vector of the reference plane, and the normal vectors are coplanar;
normalizing a difference of the photo intensities of the light source sensed by the first photo sensors;
and
determining whether the normalized difference of the photo intensities fall within the sensing area or not, so as to directly detect an angle of the light source relative to the reference plane along the first direction.

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