公开(公告)号：CA999454A

公开(公告)日：1976-11-09

申请号：CA187961

申请日：1973-12-12

Applicant: BAXTER LABORATORIES INC

Inventor： CONLON JOSEPH ,  LOWY GEORGE ,  MARCUS BYRON E

IPC: G01J3/02 ,  G01J3/06 ,  G01J3/08 ,  G01J3/12 ,  G01J3/42 ,  G01J3/427

Abstract: A spectrophotometer of the two-beam type employing two adjustable monochromators and employing a rotating chopper disc to provide time-sharing operation, such as split-beam operation, dual wavelength operation, or other desired modes of operation. The chopper disc motor is stabilized by a fiber optic feedback system and cooperating electronic system utilizing light beams reflected by the underside of the chopper disc and photo diodes responding to these reflections. The main optical system includes an adjustable lens element coupled to one of the monochromators to compensate for variations in refractive index of the lens element with wavelength. The electronic readout system is gated by the chopper disc stabilizing system to maintain synchronism of the readout signals with the two monochromatic excitation beams.

公开(公告)号：DE2553366A1

公开(公告)日：1976-08-05

申请号：DE2553366

申请日：1975-11-27

Applicant: BAXTER LABORATORIES INC

Inventor： MARCUS BYRON E

IPC: G01N21/01 ,  G01N21/03 ,  G01N21/24 ,  G01J1/42 ,  G01D3/00

Abstract: A system for compensating for magnetic disturbances caused by the rotating stirrer magnet of a photometer sample cuvette on the photomultiplier tube of the photometer. To obtain the required compensation, a companion similar magnet is located coplanar with and adjacent to the main stirrer magnet and is counter-rotated synchronously with the main magnet in opposite magnetic phase therewith. The two counter-rotating magnets are physically located symmetrically with respect to the photomultiplier tube so that their magnetic effects on the electron flow of the photomultiplier tube cancel each other out. The companion magnet may be the stirrer magnet associated with a reference cuvette mounted in side-by-side relation to the sample cuvette. The counter-rotating magnets may be gearingly coupled together and may be mounted coaxially with respective ejection plungers associated with the cuvettes.