Method and apparatus for rapidly and accurately determining a time constant from cavity ring-down data

摘要: Methods and apparatus for decreasing the time required to calculate a ring-down from sampled data and/or increasing accuracy of calculated are provided. The obtain an accurate calculation is reduced by performing linear least squares fit using estimate B1 background, then results error in B1. estimated used provide improved time. Alternatively, accurately averaging consecutive points into “bins” resulting binned signal. parameters obtained signal B2 B2. Another method, applicable either itself or combination with two preceding methods, improve providing low pass filter having bandwidth related shortest expected time, before it sampled.