The external quality factor is the important parameter for the design of resonator filter,and the measurements of the external quality factor are important for obtaining the desired filtering characteristics.

Limitation of Q_(ext) calculation method based on reflectance phase;

A method to calculate the average quality factor value ■ of strata;

Amplifying of the quality factor of AFM microcantilevers in liquid environment;

Definition of the quality factors Q of parallel and serial resonant circuits according to the exchange of energy;

Based on the definition of Q factor,when the loss of inductor should be considered,the tie between the unloaded quality factor QP of LC resonant circuit and the intrinsic quality factor Q0 of inductor coil is:QP=Q20-1(1+1/Q0),QP=Q0,while Q01.

By way of a study on the near-surface seismic wave dual transmission mechanics,the paper discussed the relation between the Q factor and shothole depth,then according to the maximum seismic shot wave energy,maximum signal-to-noise ratio and shothole depth correlation curves of different area,different Q factor,worked out corresponding shot depth.

The microring resonator was fabricated by using CMOS compatible processes with 1 μm wide waveguides and 400 μm in radius,which has a high Q factor up to 20,000 and a Free spectrum range of 0.