Princeton Instruments NIRvana-LN, User Manual, Page: 42 / 122

42 NIRvana
™
-LN System Manual Issue 4
5.1 Operation Overview
During data acquisition, the array is exposed to a source and charge accumulates in the
pixels. After the defined exposure time, the accumulated signal is readout of the array,
digitized, and transferred to the host computer. Upon data transfer, the data are displayed
and/or stored via the application software. This sequence is illustrated by the block diagram
shown in
Figure 5-1 .
Figure 5-1: Light Path Block Diagram for NIRvana-LN Systems
Whether or not the data are displayed and/or stored depends on the data collection operation
that has been selected within LightField:
• Preview
This mode is typically used when setting up the system during the First Light
procedure.
In Preview mode, the number of frames is ignored. A single frame is acquired and
displayed, another frame is acquired and overwrites the currently displayed data,
and so on until
Stop
is selected.
NOTE:
The last frame acquired before
Stop
is selected cannot be
stored.
Preview mode is particularly convenient for familiarization and setting up. For ease
in focusing, the screen refresh rate should be as rapid as possible, achieved by
operating with axes and cross-sections off, and with Zoom 1:1 selected.
Incoming Photons
Camera
Analog to Digital Converter
Computer
GigE Ethernet Interface
Display Storage
GigE Ethernet Interface
Digital Processor
InGaAs Array
44
11-0
145_0
020