公开(公告)号：WO1981001464A1

公开(公告)日：1981-05-28

申请号：PCT/AU1980000092

申请日：1980-11-19

Applicant: VARIAN TECHTRON PTY LTD ,  HAMMER M

Inventor： VARIAN TECHTRON PTY LTD

IPC: G01J03/02

CPC classification number: G06J1/00 ,  G01N21/272

Abstract: Method and apparatus for obtaining derivatives of photometric signals in spectroscopy wherein an analogue signal characteristic of a sample (12) is converted to a digital signal which is differentiated using an approximation algorithm in a non-recursive digital filter (18) operating at predetermined differentiating intervals. The derivative is then low pass filtered in a recursive digital filter (23) at filtering intervals shorter than the differentiating intervals to reconstruct an interpolated derivative.

公开(公告)号：DE3050054A1

公开(公告)日：1982-03-25

申请号：DE3050054

申请日：1980-11-19

Applicant: VARIAN TECHTRON PTY LTD ,  HAMMER M

Inventor： HAMMER M

IPC: G01J3/02

公开(公告)号：US1245410A

公开(公告)日：1917-11-06

申请号：US1913749872

申请日：1913-02-21

Applicant: CUTLER HAMMER M F G CO

Inventor： WALKUP SAMUEL THOMAS

CPC classification number: B41F13/02 ,  B65H20/02 ,  Y10T83/544 ,  Y10T83/8765

公开(公告)号：US1347863A

公开(公告)日：1920-07-27

申请号：US10484116

申请日：1916-06-21

Applicant: CUTLER HAMMER M F G CO

Inventor： LENT WILMAR F

IPC: H02P7/00

CPC classification number: H02P7/03

公开(公告)号：US1411862A

公开(公告)日：1922-04-04

申请号：US21294718

申请日：1918-01-21

Applicant: CUTLER HAMMER M F G CO

Inventor： WILHELM MEYER FRIEDRICH

IPC: H02K17/30

CPC classification number: H02K17/30

公开(公告)号：US1369457A

公开(公告)日：1921-02-22

申请号：US28424919

申请日：1919-03-22

Applicant: CUTLER HAMMER M F G CO

Inventor： WILHELM MEYER FRIEDRICH

IPC: H02P7/26

CPC classification number: H02P7/265 ,  Y10S388/913 ,  Y10T307/735

公开(公告)号：US1408758A

公开(公告)日：1922-03-07

申请号：US21294818

申请日：1918-01-21

Applicant: CUTLER HAMMER M F G CO

Inventor： WILHELM MEYER FRIEDRICH

IPC: H02M7/51

CPC classification number: H02M7/51 ,  Y10T307/484

公开(公告)号：US1191192A

公开(公告)日：1916-07-18

申请号：US1913799353

申请日：1913-11-05

Applicant: CUTLER HAMMER M F G CO

Inventor： KLEIN CHARLES J

CPC classification number: H02G3/14

公开(公告)号：US1525463A

公开(公告)日：1925-02-10

申请号：US29239119

申请日：1919-04-24

Applicant: CUTLER HAMMER M F G CO

Inventor： PACKARD HORACE N

IPC: G01F1/68

CPC classification number: G01F1/68

公开(公告)号：US1487356A

公开(公告)日：1924-03-18

申请号：US22839818

申请日：1918-04-13

Applicant: CUTLER HAMMER M F G CO

Inventor： PACKARD HORACE N

IPC: G01F1/69

CPC classification number: G01F1/69