lock-in
D y T nV¡C a A i H µq C Lock-in-Amplifier D n u I ”¯e ”¡A q S v P A L o i q o C Lock-in-Amplifier ]PSD(phase sensitive detector)¡A q S v B A L o L q H C
Lock-in q n v A A O i A v f 1G
)2sin(1111φπ+=f E e P )2sin(2222φπ+=f E e
q L V (mixer)²V o µG G
)2sin()2sin(221121213φπφπ++=×=f f E E e e e )]()(2cos[2
)]()(2cos[2212121212121φφπφφπ+++−−+−=
f f E
E f f E E (difference frequency component) (sum frequency component)
PSD AC A p q L C q o i A AC
o C p G f 1µ¥f 2®ÉA difference frequency component DC
A o p U PSD )cos(2
212
13φφ−=
E E e )1)(cos(21≈−φφ
Lock-in
lock-in i1V q A q I+P I-
S C H q eµn u C B p U G
1.q e A i q q q A A P q q y
p A o B n A P A q y a C
2.q(q u p)A i q(1M[B
10M[B100M[B1G[)M q y K q10K[(]q 10K[)
3. lock-in
(1) ¥lock-in sensitivity A A lock-inµu(p G)
µu C
(2) °10-7A A i q10M[A q A
A lock-in sensitivity A(1mV)A qµ
10V(q O lock-in q10µG)C
(3) ¿(OSC LvL)]1V A v(OSC F)P60
(p G23)A K P A(REF PH)Aµ(90o)µ0-V Bµê(270 o)µ0+V A(0 o B180 o)10V C p U
G
Lock-in
A lock-inµq C
1.lock-in sensitivity A o i BP A time constant]1s A
A lock-in I qµu(p)µu C
2. °10-7A A i q10M[A q A A
lock-in sensitivity A(1mV)A qµ10V C
3. ·lock-in i q o q P v A q q o V xx MµV xy/µB i(n)M E v(µ)C
4. °lock-in t lock-in A Aµ
µq A q(p)C
µG
1. ½sensitivity n A q n110V d A]p
G p A M A e L C
2. °Vxy Y A A sensitivity C
3. ¶sensitivity A]v q
C
4. ¶
5. ´(time constant)A]LµLªk t A n]
1s C
6.
G q u(V S lock-in q)
G lock-in I qµu
G q
