Tektronix transient digitizers

The fluorescence decay can be measured with a streak camera, a very fast photomultiplier tube-like Hamamatsu 1294U attached to Tektronix transient digitizer, a box car integrator, or photon counting. 

The other transient recorders, or perhaps more correctly transient digitizers, capture and store the waveform in a digital form in a computer-type memory. These can be further divided into two classes, those that digitize and write directly into the memory, e.g. the Biomation series of waveform recorders, and those that first write on an intermediate target from which it is then read, digitized and stored, e.g. the Tektronix series of transient digitizers. Although they share some features, the operations of these two types of transient recorder are quite different and they will be discussed separately. 

Samples were irradiated by a 10 ps single or 2 ns electron pulse from a 35 MeV linear accelerator for pulse radiolysis studies (17). The fast response optical detection systems of the pulse radiolysis system for absorption spectroscopy (18) is composed of a very fast response photodiode (R1328U, HTV.), a transient digitizer (R7912, Tektronix), a computer (PDP-11/34) and a display unit. The time resolution is about 70 ps which is determined by the rise time of the transient digitizer. 

Figure 16. The lifetime of the excited anion of hydroxypyrene trisulfonate bound to apomyoglobin. The sample was excited by a nitrogen laser (337 nm, 1 nsec full width at half maximum) and the emission of the anionic form was monitored (in arbitrary units) through a KV 550 filter by a photomultiplier attached to a Tektronix 7912 AD transient digitizer equipped with a 7A19 vertical amplifier.

Biomation, Palo Alto, Calif. Information sheet on transient recorders C. Morgan "Digital signal processing". Laser Focus 73, 52 (Nov. 1977) Handshake Information sheets on Waveform Digitizing Instruments (Tektronix, Inc., Beaverton, Ore. 1979)... 

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