Encyclopedia of Environmental Science and Engineering, Volume I and II

INSTRUMENTATION: WATER AND WASTEWATER ANALYSIS 559

Emission monochromator

Grating

Sample photomultiplier tubereflectorWhite

Reference photomultiplier tube

Grating

Absorbance compensating cell

Bean splitter

Sample compartment

Xenon lamp

Excitation monochromator

FIGURE 15 A spectrofluorometer. (Courtesy of SLM Aminco Instruments, Urbana, IL.)

REFERENCE

LIGHT PATH

PHOTOMULTIPLIER

LIGHT INTERRUPTER

MOUNTING BLOCK

LUCITE LIGHT PIPES

FORWARD LIGHT PATH

BLANK SHUTTER

BLANK KNOB

SAMPLE

MOTOR COOLING FAN

OPTICAL FILTER

RANGE SELECTOR

LIGHT CAM

DIFFUSE SCREEN

LIGHT SOURCE

Secondary; emission

Primary; excitation

Four apertures

FIGURE 14 The Model 112 Turner Digital Filter Fluorometer. (Courtesy of the Turner Division of Unipath, Mountain View, CA.)

C009_005_r03.indd 559C009_005_r03.indd 559 11/23/2005 11:12:23 AM11/23/2005 11:12:23