frequency scanning
3.It is designed to enable an MCM diver to simultaneously navigate within a search pattern while locating potential mine contacts with a high-frequency scanning sonar.
4.Data Analysis of Multi-frequency Electrical Impedance Scanning by Cole-Cole Model
6.The time-space distribution of earthquakes of moderate earthquake in concentrated activity area before earthquakes of Ms≥5.5 in North China active block has been calculated and its quiescence phenomenon has been analyzed by use of the method of accumulative frequency. The results of different scanning methods in all second-order active blocks have reflected the process of enhancement and quiescence before strong earthquakes, which revealed that the length of seismic quiescence time was related to tectonic area.
8.The article analyses the traditional principle of arc coil automatic tuning, points out its limitation,sets an automatic tuning method of external signal scanning frequency arc coil, states the principle and computing formula of external signal scanning frequency and measuring,and eliminates the wearing to the contact point and the limitation of shift adjustment .
9.This paper briefly introduces the basic principles of the phase locked loop (PLL) and pulse-controlled phase locking method, and further analyses the self catching capacity of PLL, the composition of the frequency feedback loop, the features and parameters of the frequency difference detector and so on, the results of which show that the step scanning plus the frequency guide of the frequency feedback loop can make the narrowband PLL realize the frequency catching on broadband in shorter period of time.
