Temperature measuring apparatus, temperature measurement...

Details Temperature measuring apparatus, temperature measurement... Temperature measuring apparatus, temperature measurement...

2008-04-08

2008-04-08

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C385S012000

Reexamination Certificate

active

07355715

ABSTRACT:
Light from a light source is split at a first splitter into a temperature measurement beam and a reference beam, the temperature measurement beam is further split at a second splitter into first through nth measurement beams, and the reference beam is reflected at a reference beam reflecting means. The first through nth measurement beams are radiated onto a temperature measurement target by ensuring that the optical path lengths of the first through nth measurement beams extending from the second splitter to the temperature measurement target are different from one another. By driving the reference beam reflecting means, the optical path length of the reference beam reflected at the reference beam reflecting means is altered, and concurrently, a light receiving means senses and measures interference induced by the first through and measurement beams reflected at the temperature measurement target and the reference beam reflected at the reference beam reflecting means.

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McCaulley et al, “Temperature dependence of the near-infred refractive index of silicon, gallium arsenide, and indium phosphide” Physcial Review B vol. 40, No. 11, pp. 7408-7417.

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