Optical positioning sensor
A sensor is disclosed that provides measurements in multiple degrees of freedom without significantly increasing size, complexity, or cost. The sensor can include a light component in support of a first light source operable to direct a first beam of light, and a second light source operable to direct a second beam of light. The sensor can also include an imaging device that can directly receive the first beam of light and the second beam of light and convert these into electric signals. The imaging device and the light component can be movable relative to one another. The sensor can further include a light location module and/or a position module configured to receive the electric signals and determine locations of the first beam of light, the second beam of light on the imaging device and a relative position of the imaging device and the light component.
1. A sensor, comprising:
a first light source that generates a first beam of light;
a second light source that generates a second beam of light, wherein the first light source and the second light source are supported by a light support structure;
an imager that receives the first beam of light and the second beam of light, wherein the imager and the light support structure are movable relative to one another; and
a transparent layer formed between the imager and the light support structure, wherein the transparent layer is operable to facilitate relative movement of the imager and the light support structure;
wherein the sensor:
determines centers of the first beam of light and the second beam of light on the imager based on respective intensity gradients of the first beam of light and the second beam of light, and
determines a relative position of the imager and the light support structure based the centers of the first beam of light and the second beam of light.
2. The sensor according to claim 1 , wherein the second beam of light is non-parallel to the first beam of light.
3. The sensor according to claim 1 ,
wherein the first light source is a monochromatic light source and the first beam of light is a first color,
wherein the second light source is a monochromatic light source and the second beam of light is a second color; and
wherein the imager includes:
a first monochromatic detector that receives light of the first color and converts the light of the first color into a first electrical signal, and
a second monochromatic detector that receives light of the second color and converts the light of the second color into a second electrical signal.
4. The sensor according to claim 1 ,
wherein the first light source is a chromatic light source and the second light source is a chromatic light source; and
wherein the imager includes:
a color separation mechanism that separates the first beam of light and the second beam of light into a beam of light of a first color and a beam of light of a second color,
a first monochromatic detector receives the beam of light of the first color and converts the beam of light of the first color into a first electrical signal, and
a second monochromatic detector that receives the beam of light of the second color and converts the beam of light of the second color into a second electrical signal.
5. The sensor according to claim 1 , wherein the sensor further determines the relative movement of the light support structure and the imager in multiple degrees of freedom.
6. The sensor according to claim 1 , wherein the transparent layer is formed from silicone.
7. The sensor according to claim 1 , wherein the light support structure is mechanically coupled to an object to be sensed; and
the sensor further calculates a strain on a surface of the object in one or more degrees of freedom based on the relative position of the imager and the light support structure.
8. The sensor according to claim 1 , wherein the light support structure further supports a known mass; and
the sensor further determines acceleration based on the known mass and the relative position of the imager and the light support structure.
9. The sensor according to claim 1 , further comprising:
one or more additional light sources that each generate a respective beam of light, wherein the one or more additional light sources; and
wherein the imager receives each respective beam of light, and the sensor further determines the relative position of the imager and the light support structure based on locations of each respective beam of light determined by the sensor.
10. The sensor according to claim 1 , wherein the imager is a chromatic imaging device that senses different color light beams separately.