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IG aln Accelerometers Accelerometers measure linear acceleration in one, two or three ￥()→s2X(s-3 axes. We distinguish (generally neglect initial conditions) single Vs. multi axis accelerometers mag +40db/dec DC versus non-DC accelerometers rolloff Recorded voltage response to base motion 1(t)=K(t)+V out Can measure: linear, centrifugal and gravitational acceleration Use caution when double-integrating acceleration to get position(drift) Single-Axis C1 Accelerometer must be aligned with sensing axis C2 Example: Kistler Piezobeam (not responsive at Dc Example: Summit capacitive Manufacturers: Kistler. Vibrometer Summit accelerometer Dc capable) 16.810(16682) Massachusetts Institute of Technology$FFHOHURPHWHUV $FFHOHURPHWHUVPHDVXUHOLQHDU DFFHOHUDWLRQLQRQHWZRRUWKUHH D[HV:HGLVWLQJXLVK VLQJOHYVPXOWLD[LVDFFHOHURPHWHUV '&YHUVXVQRQ'&DFFHOHURPHWHUV → V ; V − V[ − G[ [ W GW JHQHUDOO\QHJOHFWLQLWLDOFRQGLWLRQV PDJ $FFHOHURPHWHU UHVSRQVHWR EDVHPRWLRQ G%GHF UROORII 5HFRUGHGYROWDJH 9 W = .[W +9 ω RXW D &DQPHDVXUH OLQHDUFHQWULIXJDODQGJUDYLWDWLRQDODFFHOHUDWLRQ 8VHFDXWLRQZKHQGRXEOHLQWHJUDWLQJDFFHOHUDWLRQWRJHWSRVLWLRQ GULIW 6LQJOH$[LV & $FFHOHURPHWHUPXVWEH DOLJQHGZLWKVHQVLQJD[LV & ([DPSOH .LVWOHU3LH]REHDP QRWUHVSRQVLYHDW'& ([DPSOH 6XPPLWFDSDFLWLYH 0DQXIDFWXUHUV .LVWOHU9LEURPHWHU6XPPLW DFFHOHURPHWHU '&FDSDEOH D