For photon counting applications including static
and dynamic light scattering
Features
at a glance
USB communications
Compact size,
low power requirements, less than 300 mW
Auto- & cross-correlation
modes
Up to 522 hardware
channels
Sampling time
25 ns to 40 ms
Delay range 25
ns to 1,310 s
100% efficient,
real-time operation over the full delay time
range
Supplied with control
software for use with Windows™
The
new TurboCorr digital correlator
is the successor to the BI-9010AT and BI-9000AT.
The new correlator card uses a cutting edge digital
signal processor (DSP) which allows all the circuits
to be embedded in a single, high density chip.
The benefits of this design include full, in-system
reprogrammability, significantly reduced power
consumption as compared with earlier correlators
and a compact design. The TurboCorr uses USB communications
for enhanced portability and compatibility.
The
TurboCorr is an advanced and extremely versatile
digital photon correlator and counter designed
for applications such as dynamic (DLS) and static
(SLS) light scattering.
The
TurboCorr has an adjustable delay range capable
of producing a contiguous correlation function
from 25 ns to 1,310 s representing a time axis
that spans more than 10 decades. The middle and
low speed circuits can be operated as independent
correlators, simultaneously processing different
input signals. This can be used, for example,
to correlate two light scattering signals from
different detector angles simultaneously. An on-board
microprocessor on each correlator card controls
the circuits and collects the correlation function(s).
This relieves the CPU of the host computer of
many tasks. Unlike other correlators, the TurboCorr
never requires prescaling.
Operating
modes
The
TurboCorr digital correlator can be used for real-time
operation in both auto- and cross-correlation
modes. It is 100% efficient in either mode over
the entire delay time range. Through the software,
the user can select the number of hardware channels,
either linearly spaced or geometrically spaced.
In addition, channel spacing can be user-defined.
The TurboCorr can be used for a wide variety of
dynamic light scattering applications.
The
TurboCorr is supplied complete with the BI-DLSW
control software for Windows. In addition, Brookhaven
offers a number of additional software programmes
suitable for use with the TurboCorr and the BI-200SM
laser light scattering goniometer system. These
applications include particle sizing by dynamic
light scattering (cumulants, NNLS, CONTIN, exponential
sampling, and double exponential), characterization
of gels and glass transitions (Williams-Watts),
and molecular weight measurements by total intensity
methods ( Zimm , Berry , and Debye plots). A user
friendly alignment/stability test program (BI-IST)
is available for use with the BI-200SM precision
goniometer.
Channel
layout :
Section
Channels
Sampling Time Range
Maximum Time Delay
Multiplier Bits
Low Speed
1 to 240
50 µs to 40 ms
1,310 s (40 ms)
16 x 16
Mid Speed
1 to 256
500 ns to 100 µs
1.6 s (100 µs)
8 x 8
Std High Speed
14 Channels at 100, 200, 300,
400, 500, 600, 800 ns, 1.0, 1.2, 1.4, 1.6,
2.0 and 2.4 µs
Opt High Speed
12 Channels at 25, 50, 75, 125,
150,175, 225, 250, 275, 325, 350 and 375 ns
BI-9000AT
Specifications:
Format:
USB 2.0. Four signal inputs and two low
voltage outputs.
Maximum Number of Channels:
240 + 256 + 14 + 12 = 522
Delay Time Axis:
User selectable (except fixed channels)
from linear, constant ratio, or as individual
time points recalled from user files.
Dynamic Range:
Over 10 decades (25 ns to 1,310 seconds).
Operation Modes:
Automatic and Manual. User definable macro
commands to write, save, and recall unlimited
number of sequences for single keystroke implementation.
