Flex400-OEM is Quad digital correlator.
Specifications:
- Four auto correlation functions simultaneously.
- 800ns Minimum sample time.
- 4x256 minimum sample time.
- Delay time range: 800 ns to 1 hour in multiple tau channel layout.
Multiple tau channel layout ( sample time denoted at T, data width W):
- First 16 channels: T = 800ns, W = 3 bits, delay times T to 16*T;
- Second 8 channels: T = 2*800ns, W = 4 bits, delay times 9*T to 16*T
- Third 8 channels: T = 4*800ns, W = 5 bits, delay times 9*T to 16*T;
- Fourth 8 channels: T = 8*800ns, W = 6 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:
The intensity in Quad mode limits are following:
- Maximum intensity integrated over 800 ns: 8.75 MHz. Clipping will occur if the input intensity exceeds the maximum.
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.