Chemistry Department

College of Saint Benedict/Saint John's University

Instrumental Analysis

Chem 336

Scanning UV-Visible Spectrophotometer

Under the Hood

Chopper

The choppers are circular in shape with 1/3 of the surface mirrored, 1/3 open to allow light to pass through and 1/3 blackened to measure the dark current. The choppers rotate at 60 Hz with external syncronization with the detection system.

Return to DMS90

Return to Chem 336

Michael R. Ross
Chemistry Department, College of St. Benedict/St. John's University
St. Joseph, MN 56374
320-363-5482

Comments to author: mross@csbsju.edu

Revised: 1/1/98
URL: http://www.users.csbsju.edu/~mross/ch336/dms90Chopper.html