IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research

IGC
Annual Report 2007
Fig.2 Virtual instrument program panel diagram for PSoC -Raman spectrometer automation design.
as a rate meter for initial setting
up of the laser intensity, slit
widths, etc, in the spectrometer.
The panel diagram includes
user variable parameters like
sample name, laser power,
wave length, slits information
as a user file for proper
documentation of the
experiment.
In PSoC, the main advantage
is, one can program the choice
of user required function
module: Using PSoC designer
tool, a blank PSoC chip has
been programmed to count the
detector pulses for the user
preset time and controls the
monochromator motor drive to
move to the next user required
wave number position. The
count pulses have been
transferred to PC memory
through serial port. A 16 bit
counter and a timer has been
designed within the PSoC chip
for counting the detector pulses
from Raman setup for the user
defined preset time. Interrupt
handler routine in PSoC editor
program, enables wider range
of counting above 64k and
preset time from milli-seconds
to several hours, but uses only
16 bit counter/ timer functions,
by using interrupts through
PSoC editor program written in
'C' compiler.
This simple and cost effective
embedded design automation
of Raman spectrometer setup
using a single Programmable
System on Chip (PSoC),
interfaced with PC and
controlled by the virtual
instrument program provides
wider range of counting and
preset time and works under
window environment of PC.
This design approach can also
be extended to other
automation requirements
involving event counting
applications.
ENABLING TECHNOLOGIES 143