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FLEX99OEM-267D is a dual channel real time digital correlator.
Flex99OEM-267D specifications:
- Dual Autocorrelation.
- 267 ns minimum sample.
- 264x2 real time channels.
- Delay time range: 267 ns to 1 hour in multiple tau channel layout.
- Input signal: standard TTL pulses.
- Two BNC connectors
- One USB connector.
- No external power supply needed.
- Symmetric normalization.
- Easy to use software for Windows98/Windows2000 libraries included.
Multiple tau channel layout ( sample time denoted at T, data width W):
- First 16 channels: T = 267ns, W = 4 bits, delay times T to 16*T;
- Second 8 channels: T = 2*267ns, W = 5 bits, delay times 9*T to 16*T
- Third 8 channels: T = 4*267ns, W = 6 bits, delay times 9*T to 16*T;
- Fourth 8 channels: T = 8*267ns, W = 7 bits, delay times 9*T to 16*T;
- Sample time doubles every 8 channels and data width increment 1 bit to prevent overflow.
- The longest delay time is about one hour.
Intensity limits:
Flex99OEM-267D 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 267ns: 56.2 MHz. Clipping will happen if the
input intensity exceeds the maximum.
- Maximum intensity integrated over 100ms: 17.6 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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