After bamgal10o17 doped with sr , ca , the cell volume of each doped phosphors is shrunk and the crystal parameter c is decreased
2.
On the other hand , the reflective liquid crystal working mode is calculated . according to the switching ability of the lclv , a suitable working point was selected in the liquid crystal parameter space
3.
The investigation of structure by x - ray diffraction shows that crystal parameters changes clearly when percenting ca and la into pbtio _ 3 , it was caused by the ca ion and la ion replaced the pb ion of a position in perovskite compound , that bring lattice mismatch and asymmetrical replace
4.
The system can generate sweep frequency signal with frequency range from 100khz to 150mhz and power range from - 40dbm to + 18dbm , and measure the gain and phase of the crystal . according to the gain and phase information and the iec - 444 standard , crystal parameters can be calculated , such as nominal frequency , series resistance , shunt capacitance , motion capacitance , motion inductance , q factor and so on
5.
In the paper , the design of the real - time test system for crystal parameters is presented . the signal generator of sweep frequency based on dds device ad9852 , the signal measuring circuit based on gain and phase detector ad8302 , and the real - time control and deal circuit based on tms320vc5416 and the design of high - speed printed digital & analog circuit board are discussed in details
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