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FLEX03OEM/4ch is a fast real time digital correlator. The picture is shown
with an enclosure.
Flex03OEM/4ch specifications:
- 4 auto correlation correlation or 4 cross correlation functions.
- 160 ns minimum sample.
- 512 x 4 real time channels.
- Delay time range: 160 ns to 1.5 hour in MT32 multiple tau channel layout.
- Input signal: standard TTL pulses.
- Two BNC connectors
- One USB 2.0 connector.
- No external power supply needed.
- Symmetric normalization.
- Easy to use software for Windows2000/Windows XP libraries included.
Multiple tau channel layout ( sample time denoted at T, data width W):
- First 32 channels: T = 160ns, W = 6 bits, delay times T to 32*T;
- Second 16 channels: T = 2*160ns, W = 7 bits, delay times 17*T to 32*T
- Third 16 channels: T = 4*160ns, W = 8 bits, delay times 17*T to 32*T
- Fourth 16 channels: T = 8*160ns, W = 9 bits, delay times 17*T to 32*T
- Sample time doubles every 16 channels and data width increment 1 bit to prevent overflow.
- The longest delay time is about one and half hour.
Intensity limits:
Flex03OEM/4ch is designed with sufficient hardware resource to prevent overflow at any
reasonable intensities. However, in extreme and unphysical situations, clipping and
overflow could happen. The intensity limits are following:
- Maximum intensity integrated over 160ns: 100 MHz. Clipping will happen if the
input intensity exceeds the maximum.
- Maximum intensity integrated over 57.7ms: 30 MHz. Overflow will happen if
the maximum is exceeded.
More about multiple tau theory.
Multiple tau theory was invented by Klaus Schätzel. The following papers discuss
the theory and the advantage of the multiple tau scheme.
- Klaus Schätzel. Single Photon Correlation Techniques. Dynamic Light
Scattering: The method and some applications, Edit by Wyn Brown, Clarendon Press, Oxford,
P 76, 1993.
- Klaus Schätzel et. Noise on Multiple-Tau Photon Correlation Data.
SPIE Vol. 1430, P109, Photon Correlation Spectroscopy: Multicomponent Systems,
1991.
- Klaus Schätzel. New Concept in Correlator Design. Inst. Phys. Conf. Ser. No.
77, P175, 1985.
- Klaus Schätzel et. Photon Correlation Measurements at Large Lag
Times. Journal of Modern Optics, Vol. 35, No. 4, P711, 1988.
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