Patent ID: 8419272

Claim:
A temperature measuring apparatus, comprising: a light intensity measurer configured to irradiate, with a probe laser beam, an object to be heated having a uniquely defined correlation between temperature and refractive index, and to determine a light intensity property X representing a relationship between time and light intensity of any one of a reflected light and a transmitted light occurring as a result of interference of the probe laser beam multiply-reflected within the object to be heated; a calculator configured to apply a thermal incidence equivalent to heating conditions for the object to be heated to a virtual object to be heated having dimensional, thermal, and optical characteristics equivalent to dimensional, thermal, and optical characteristics of the object to be heated, and to acquire, as a replicated object to be heated, the virtual object to be heated having a light intensity property Z, which is obtained by irradiating the virtual object to be heated with a probe laser beam having equivalent characteristics to the probe laser beam irradiating the object to be heated and closest to the light intensity property X; and a temperature outputter configured to determine a temperature at a predetermined position on the object to be heated at a predetermined time on the basis of the replicated object to be heated.