And an object thereof is to provide detection apparatus that can be evaluated at high speed optical characteristics of the optical path length, such as chromatic dispersion, optical path length measuring device, an optical member such evaluation methods. Another object of the present invention, the detection device can be evaluated with high accuracy and thermal effects chemical and biological reactions, is to provide the temperature change detection method. In the detector 10A, are superimposed zero order light B0 which receives the wavelength dispersion of the measurement object S, and B1 primary light shifted frequency, to generate a beat low frequency whereby the wavelength dependence of the beat phase I was made to measure the gender. Furthermore, the phase reference signal an AC electrical signal from the frequency shifter 12, it is arranged to detect the relative phase of the measurement signal. Also, it is frequency-shifted, respectively the measurement light and reference light having different wavelengths from each other, and to ask relatively based on the beat phase of the reference light, the beat phase of the measurement light is also effective.
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