Directed Electronics 7111A Spécifications télécharger pdf (Page 18)

PN 718113AF

Laser Induced Fluorescence Detection

System Overview — LIF System

connected to your laser’s interlock circuit. The connectors and switches in the detector are rated

for low voltage (TTL level) signals.

CAUTION

To avoid damaging the interlock connector and switches in the LIF Detector

Module, do not connect interlock wires in the laser unit to a voltage greater than

the rated voltage of the interlock connector and switches (5V, 0.1 A).

U.S. Federal regulations require that this connection be made to limit access to

laser energy when the cable is disconnected from the LIF Interconnect Module.

Optical System

Refer to Figure 3 for a schematic overview of the LIF Detector optical diagram. Fiber optic cables

carry laser light from the laser(s) through the interconnect module to the capillary window. When

a fluorescent component passing through the capillary reaches the illuminated area, it emits light

in all directions. This fluorescence is collected by a spherical reflector in the probe and a modified

ball lens in the LIF Detector plug. The collected fluorescent light is split by a beam splitter and

imaged onto two photomultiplier tubes, one for each channel. (For a single wavelength LIF

detector, no beam splitter is present and the collected fluorescent light is imaged directly onto one

photomultiplier tube).

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Directed Electronics 7111A Spécifications Page 18