Novel digital iteration algorithm for fluorescence lifetime measurement of multi-probe fiber thermometer

We report a novel digital iteration algorithm for fluorescence lifetime (FL) measurement, which is proved suitable for the fluorescence lifetime-based multi-probe fiber thermometer application. The algorithm utilizes only one set of fluorescence decay sampling data to decide the FL by using the basic addition and subtraction computation. Iteration number of about 10-12 times is sufficient to reach the final stable value. As a result, the algorithm features robust, high efficiency, strong anti-noise and immune to background level. The algorithm has been successfully used in a sapphire fiber-based multi-probe thermometer covering the temperature range from room temperature to 1000 °C and confirmed suitable for practical application.