SPECTRAL SIGNAL ANALYZER SYSTEM

摘要

2116858 9306445 PCTABS00021 A process for analyzing a spectral signal generated by a birefringent element and transmitted to an array. An output spectral signal emanating from the array is converted from an analog to a digital signal to establish a reference waveform which has a dominant frequency after the birefringent element is exposed to a known temperature. Thereafter, a current waveform is generated from the output spectral signal emanating from the array. A phase and frequency relationship is obtained by cross correlating the current waveform and the reference waveform. The dominant frequency for the phase and frequency relationship is obtained by Fast Fourier Transformation. Thereafter, the dominant frequency for the phase and frequency relationship of the current waveform is compared with the dominant frequency for the reference waveform to determine a temperature range. The temperature range and phase and dominant frequency for the current waveform are matched with a reference schedule stored in the memory of a digital signal processor to predict the current temperature experienced by the birefringent element. This predicted temperature is displayed on a screen to inform an operator of the current operational conditions experienced by the birefringent element.