The Principle of Frequency Domain Sensing

The solution to the first-order differential equation (9.45) yields 

The sensor luminescence response as a function of time W) is then 

The steady-state sensor luminescent response (t — °°) as a time function is written in the following form 

TheAfc(co), MAo ), and are the measurable quantities in the frequency domain. Commonly the modulation ratio M(w) is used 

The CW or intensity-based information is also obtained in the frequency domain and is given by Eq. (9.53) 

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