A sensor, comprising: a first monochromatic light source operable to direct a first beam of light of a first color, a second monochromatic light source operable to direct a second beam of light of a second color, wherein the first color and the second color are different monochromatic colors; an imaging device that includes: a first monochromatic detector configured to receive light of the first color and convert the light into a first electrical signal, and a second monochromatic detector configured to receive light of the second color and convert the light into a second electrical signal; a light component, positioned proximate to the imaging device, that supports the first monochromatic light source and the second monochromatic light source, wherein the imaging device and the light component are movable relative to one another; an elastic member that connects the light component to the imaging device, wherein the elastic member is operable to facilitate relative movement of the imaging device and the light component; a light location module configured to receive the first signal and the second electric signal and determine locations of the first beam of light and the second beam of light on the imaging device; and a position module configured to determine a relative position of the imaging device and the light component based on the locations of the first beam of light and the second beam of light on the imaging device. a first monochromatic light source operable to direct a first beam of light of a first color, a second monochromatic light source operable to direct a second beam of light of a second color, wherein the first color and the second color are different monochromatic colors; an imaging device that includes: a first monochromatic detector configured to receive light of the first color and convert the light into a first electrical signal, and a second monochromatic detector configured to receive light of the second color and convert the light into a second electrical signal; a light component, positioned proximate to the imaging device, that supports the first monochromatic light source and the second monochromatic light source, wherein the imaging device and the light component are movable relative to one another; an elastic member that connects the light component to the imaging device, wherein the elastic member is operable to facilitate relative movement of the imaging device and the light component; a light location module configured to receive the first signal and the second electric signal and determine locations of the first beam of light and the second beam of light on the imaging device; and a position module configured to determine a relative position of the imaging device and the light component based on the locations of the first beam of light and the second beam of light on the imaging device. a first monochromatic detector configured to receive light of the first color and convert the light into a first electrical signal, and a second monochromatic detector configured to receive light of the second color and convert the light into a second electrical signal; a light component, positioned proximate to the imaging device, that supports the first monochromatic light source and the second monochromatic light source, wherein the imaging device and the light component are movable relative to one another; an elastic member that connects the light component to the imaging device, wherein the elastic member is operable to facilitate relative movement of the imaging device and the light component; a light location module configured to receive the first signal and the second electric signal and determine locations of the first beam of light and the second beam of light on the imaging device; and a position module configured to determine a relative position of the imaging device and the light component based on the locations of the first beam of light and the second beam of light on the imaging device.