激光探针测量非线性系统的研究-声学技术.PDF

¹ 吴　兵　陈旭东　林靖波　干昌明　姜文华 ( 210093) 1 , , , , , 90 , , v = sinX t , 1 b v v = [cosX t cosU(t) - sinX t sinX(t) ] sinUt det 1 b b b = ( 1/ 2) [ 2 ( ) - ( 1- 2 ) ( ) ] B sin Xb tcosU t cos Xbt sinU t , , v uD - U(t) / 2, , : ( 1) ( PLL) [ 1, 2] , 2 , , , 2 , , 90 1 , : , , , , , , , 3BPF (2) ( BPF) 3 , ( SAWF) , P/ 2 , 1 1 ( 3dB) . 8MHz 300kHz 21dB 34dB v = cos( X t + U(t) ) , U( t) = 4Pu sint/ K s 0 0 - 120 , = ( + ) SH v r cos X0 Xb t ( + ( ) ) , 90 , v det = cos Xb t U t X0 , : ( a) , u sint