Patent ID: 7978335

Claim:
A system for producing a tomographic image by optical tomography, the system comprising: a light source unit that outputs light; a light division means that divides the light, which has been output from the light source unit, into measurement light and reference light; a light combination means that combines reflection light that is reflected from a measurement target when the measurement target is irradiated with the measurement light, which has been obtained by dividing the light by the light division means, and the reference light; a light splitting means that splits interference light obtained by combining the reflection light and the reference light at the light combination means into first interference light and second interference light; an interference-light optical path length adjustment means that adjusts the optical path length of at least one of the first interference light and the second interference light, which have been obtained by splitting the interference light at the light splitting means, so that the optical path length of the first interference light and that of the second interference light become the same; an interference light detection means that detects, as an interference signal, a difference between the first interference light and the second interference light, the optical path length of at least one of which has been adjusted at the interference-light optical path length adjustment means; and a tomographic image processing means that produces the tomographic image based on the interference signal detected by the interference light detection means.