公开(公告)号：US3615140A

公开(公告)日：1971-10-26

申请号：US3615140D

申请日：1969-11-07

Applicant: STAMICARBON

Inventor： DOORNEKAMP JOHAN G F ,  SIESWERDA BAUKE S

IPC: G01P3/486 ,  H02P5/52 ,  G01N21/24

CPC classification number: G01P3/486 ,  H02P5/56

Abstract: AN APPARATUS FOR MEASURING THE REFRACTIVE INDEX OF A SOLUTION IN A ROTATING CENTRIFUGE PROVIDED WITH A MULTICELL ROTOR AND WITH A SELECTOR CIRCUIT FOR OBSERVING A GIVEN CELL WITH APPLICATION OF A LIGHT SOURCE CONTINUOUSLY OMITTING RADIATION AND A MOTOR-OPERATED ROTARY DISC, SERVING AS A GATE, WHOSE SPEED OF REVOLUTION IS DERIVED FROM THAT OF THE ROTOR, BOTH THE ROTOR AND THE DISC BEING EQUIPPED WITH MEANS FOR THE GENERATION OF PULSES WITH A FREQUENCY THAT IS DIRECTLY PROPORTIONAL TO THE NUMBER OF REVOLUTIONS AND WHEREIN USE IS MADE OF AN ELECTRONIC CONTROLLER WHICH FEEDS THE DISC DRIVE WITH PULSES OF A FREQUENCY EQUAL TO THAT OF THE ROTOR PULSES, UNLESS SAID MOTOR IS ROTATING AT TOO HIGH A SPEED, WHILE IN THE CASE OF A SYNCHRONOUS OR LAGGING SPEED OF REVOLUTION THE TIME DURATION OF THE PULSES TO BE FED TO THE MOTOR IS REDUCED BY THE PULSES GENERATED BY THE DISC IN SO FAR AS THE LATTER PULSES COME WITHIN THE TIME DURATION OF THE PULSES TO BE FED TO THE MOTOR, AND THE DISC IS COUPLED WITH A DAMPER FOR THE SUPPRESSION OF ROTATIONAL VIBRATIONS.