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• step8

Step 8: Check the transfer function of FIR filters

• Check the transfer function of Inverse sensing filter (CFL/MICH_IN)

> kagra-cal/Observation/Phase1/tutorials/trf --frame=K-TEST-1209288324-4.gwf  --channel=CALIB_CFL,CALIB_MIN --output=cfl.png
Channels: K1:CALIB_CFL K1:CALIB_MIN

• The bode plot shows the frequency response of the inverse-sensing FIR filter, where you can see the low-frequency cutoff
• Check the transfer function of Actuation filter (AFL/MICH_OUT)

> kagra-cal/Observation/Phase1/tutorials/trf --frame=K-TEST-1209288324-4.gwf --channel=CALIB_AFL,CALIB_MOU --output=afl.png --logy --invph
Channels: K1:CALIB_AFL K1:CALIB_MOU

• The bode plot shows the frequency response of the actuation FIR filter, where you can see the low-frequency cutoff

• (Next) Step 9: Make an ASD from a frame (cache) file

• (Prev) Step 7: Apply FIR filters and make a strain frame file

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