Based on the spectra analysis of samples from different block and different formations of Jiangsu oilfield, the most high peak wave-length, the fluorescence class and the oil-nature index are withdrawed as characteristic values.

The analytical expression for the reflection-maximum wavelengths of the uniform fiber-grating F-P cavity is derived and explained by introducing equivalent F-P cavity length from its work principle,the reflection peak gap and the resonance peak numbers of the main band width are also obtained.

Change of the transmission peaks of multi-cavity thin film interleaver as the incident angle changes

The influences of magnitude and location of the phase-shift region an d the parameters of a grating on the narrow transmission peak in reflection spec tra of the grating are discussed.

Meanwhile,we also conduct an experiment on the change of luminous intensity,luminous flux and peak wavelength with current and time.

Different shifts of peak wavelengths of blue and red LEDs were studied by measuring the two kinds of LEDs under DC and pulse currents,and it demonstrates that it is the heat and polarization effects that influence the shifts of peak wavelengths.

Peak wavelength,bandwith,domain wavelength,and centroid wavelength are factors affecting on light color of LED.