FLEX99OEM-12 is a real time digital correlator.
Flex99-OEM specifications:
- Auto/cross*-
- correlations.
- 12.5 ns minimum sample.
- 288 real time channels.
- Delay time range: 12.5ns to 57minutes in multiple tau channel layout.
- Input signal: standard TTL pulses.
- Two BNC connectors
- One USB connector.
- No external power supply needed.
- Dynamic link library (DLL) for Win32 included.
- Dynamic link library (DLL) for Win64 optional.
Multiple tau channel layout ( sample time denoted at T, data width W):
- First 16 channels: T = 12.5ns, W = 1 bits, delay times T to 16*T;
- Second 8 channels: T = 2*12.5ns, W =2 bits, delay times 9*T to 16*T
- Third 8 channels: T = 4*12.5ns, W = 3 bits, delay times 9*T to 16*T;
- Fourth 8 channels: T = 8*12.5ns, W = 4 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-12 is designed with sufficient hardware resource to prevent overflow at any reasonable intensities. However, in extreme situations, clipping and overflow could happen. The intensity limits are following:
- Maximum intensity integrated over 480ns: 80 MHz. Clipping will happen if the input intensity exceeds the maximum.
- Maximum intensity integrated over 104ms: 22 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.