公开(公告)号：EP0165816B1

公开(公告)日：1989-06-14

申请号：EP85304410.5

申请日：1985-06-20

Applicant: PENLON LIMITED

Inventor： Davies, William ,  Hahn, Clive E.W. ,  Jackson, Roy K. ,  McGraghan, Thomas A. ,  Palayiwa, Eileen ,  Sugg, Basil R.

IPC: G01N21/45 ,  G01J9/02

CPC classification number: G01N21/45 ,  G01N2201/1245

公开(公告)号：EP0165816A3

公开(公告)日：1986-08-13

申请号：EP85304410

申请日：1985-06-20

Applicant: PENLON LIMITED

Inventor： Davies, William ,  Hahn, Clive E.W. ,  Jackson, Roy K. ,  McGraghan, Thomas A. ,  Palayiwa, Eileen ,  Sugg, Basil R.

IPC: G01N21/45 ,  G01J09/02

CPC classification number: G01N21/45 ,  G01N2201/1245

Abstract: An apparatus and method for analysing a gas of the kind adapted to produce an interference pattern displacements of which are indicative of changes of the constitution of the gas involves exposing an array 8 of photosensitive elements to the interference pattern. Respective digital indications of the intensity of the interference pattern falling on the elements are produced by means of a timing circuit 16 adapted to clock data out of the array 8 as a series of analogue pulses which are held by a fast peak detector 17 and converted by an analogue-to-digital converter 18 into digital indications. The position of a principal peak of the interference pattern is then determined by means of a microprocessor (not shown) adapted to determine the best fit of the digital indications with appropriate pre-stored values.

公开(公告)号：EP0165816A2

公开(公告)日：1985-12-27

申请号：EP85304410.5

申请日：1985-06-20

Applicant: PENLON LIMITED

Inventor： Davies, William ,  Hahn, Clive E.W. ,  Jackson, Roy K. ,  McGraghan, Thomas A. ,  Palayiwa, Eileen ,  Sugg, Basil R.

IPC: G01N21/45 ,  G01J9/02

CPC classification number: G01N21/45 ,  G01N2201/1245

Abstract: An apparatus and method for analysing a gas of the kind adapted to produce an interference pattern displacements of which are indicative of changes of the constitution of the gas involves exposing an array 8 of photosensitive elements to the interference pattern. Respective digital indications of the intensity of the interference pattern falling on the elements are produced by means of a timing circuit 16 adapted to clock data out of the array 8 as a series of analogue pulses which are held by a fast peak detector 17 and converted by an analogue-to-digital converter 18 into digital indications. The position of a principal peak of the interference pattern is then determined by means of a microprocessor (not shown) adapted to determine the best fit of the digital indications with appropriate pre-stored values.