Spectral signal analyzer system

A process for analyzing a plurality of multiple period spectrally modulated signals generated by a birefringent element and transmitted to an array, comprising the steps of:

• converting first output of said multiple period spectrally modulated signals from said array from an analog to a digital signal to establish a reference wave form, said reference wave form being generated when said birefringent element is exposed to a known temperature, said reference wave form having a phase and dominant frequency;
• storing said phase and dominant frequency for said reference wave form and said reference wave form in the memory of a digital signal processor;
• converting second output of said multiple period spectrally modulated signals from said array from an analog to a digital signal to establish a current wave form;
• extracting an unknown phase and frequency relationship between the current wave form and the reference wave form by performing a cross correlation of the current wave form and reference wave form in the digital signal processor and performing a Fourier Transformation on said cross correlation to determine the dominant frequency and phase of said unknown phase and frequency;
• and
• comparing said unknown dominant frequency with said stored dominant frequency to establish the temperature range for said unknown phase;
• matching said unknown temperature range and phase with a reference table in said digital signal processor to determine the current temperature of the birefringent element;
• and
• selectively communicating said current temperature of said birefringent element to an operational control.

A process for analyzing a plurality of multiple period spectrally modulated signals generated by a birefringent element and transmitted to an array, comprising the steps of:

• establishing a reference wave form from a first output of said multiple period spectrally modulated signals emanating from said array in response to the birefringent element being exposed to a known temperature, said reference wave form having a dominant frequency and initial phase;
• storing said dominant frequency and initial phase of said reference wave in a digital processor;
• sampling a second output of said multiple period spectrally modulated signals emanating from said array to establish a current wave form;
• obtaining the dominant frequency and phase for said current wave form;
• and
• determining the difference in the dominant frequency of the current wave form and the dominant frequency of the reference wave form to establish the temperature range for
• matching said difference between the current phase with a reference phase in a schedule to determine the current temperature of the birefringent element.