Patent ID: 7446881

Claim:
A temperature/thickness measuring apparatus that measures temperatures or the thicknesses of a plurality of measurement targets set so as to face opposite one another based upon interference of light, comprising: a light source that emits light with a wavelength that allows the light to be transmitted and reflected at said measurement targets; a splitter that splits the light from said light source to measurement light and reference light; a reference light reflecting means for reflecting said reference light from said splitter; an optical path length altering means for altering the optical path length of said reference light reflected by said reference light reflecting means; a reference light transmitting means for transmitting said reference light from said splitter to a reference light radiation position at which said reference light is radiated toward said reference light reflecting means; a measurement light transmitting means for transmitting said measurement light from said splitter to a measurement light radiation position at which said measurement light is radiated toward said plurality of measurement targets so as to be transmitted through said measurement targets; and a light receiving means for measuring interference of light manifested by measurement beams reflected from said measurement targets and said reference light reflected from said reference light reflecting means.