公开(公告)号：US3626364A

公开(公告)日：1971-12-07

申请号：US3626364D

申请日：1969-07-15

Applicant: LITTLE INC A

Inventor： SIMON IVAN ,  SMALLMAN CARL R ,  COHEN MARTIN L ,  STONE RICHARD S

IPC: G01V1/18 ,  G01V1/16

CPC classification number: G01V1/184

Abstract: A three-axis seismometer in which three masses are suspended for essentially frictionless movement within certain directions in magnetic fields. Detecting means sense movement of the masses and generate signals used to actuate feedback means. The amount of feedback required is used as a measure of seismic motion. Since motion sensing and the measurement of the magnitude of the motion are separated, output of the instrument may be linear. Responses in unwanted frequency ranges may be filtered out.

公开(公告)号：US3338730A

公开(公告)日：1967-08-29

申请号：US34560964

申请日：1964-02-18

Applicant: LITTLE INC A

Inventor： SLADE ALBERT E ,  SMALLMAN CARL R

IPC: B44F1/04 ,  C22F1/04 ,  C23C14/02 ,  C23C16/02 ,  C23C28/00 ,  C23F1/00 ,  G02B5/136 ,  G02B5/28

CPC classification number: C23F1/00 ,  B44F1/04 ,  C22F1/04 ,  C23C14/0015 ,  C23C14/02 ,  C23C16/006 ,  C23C16/0227 ,  C23C16/0254 ,  C23C28/00 ,  G02B5/136 ,  G02B5/285 ,  Y10T428/24364 ,  Y10T428/24537 ,  Y10T428/265 ,  Y10T428/266