Detection device, optical path length measurement device,...

Details Detection device, optical path length measurement device,... Detection device, optical path length measurement device,...

2004-08-06

2008-09-16

Chowdhury, Tarifur R (Department: 2886)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S521000

Reexamination Certificate

active

07426038

ABSTRACT:
An object of the invention is to provide a detection apparatus, an optical path length measuring apparatus, a method for evaluating an optical member, and the like, which can evaluate optical characteristics such as chromatic dispersion and an optical path length at a high speed. Another object is to provide a detection apparatus and a method for detecting a change in temperature, which can evaluate chemical and biological reactions and an effect of hyperthermia with high accuracy. In a detection apparatus10A, zero-order light B0undergoing chromatic dispersion of a measurement object S is superimposed on first-order light B1shifted in frequency, whereby a low-frequency beat is produced, and wavelength dependence of a beat phase thereof is measured. Moreover, using an AC electric signal from a frequency shifter12as a phase reference signal, a relative position of a probe signal is detected. In addition, it is effective to shift the frequencies of probe light and reference light having mutually different wavelengths and determine a beat phase of probe light in a relative manner on the basis of a beat phase of reference light.

REFERENCES:
patent: 7009710 (2006-03-01), Sullivan et al.
patent: 7126695 (2006-10-01), Tansey
patent: 2002/0101593 (2002-08-01), Yang et al.
patent: S61-247901 (1986-11-01), None
patent: S62-063833 (1987-03-01), None
patent: H10-019508 (1998-01-01), None

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