We have developed and successfully used an integrating two-dimensional silicon diode array vidicon photometer which is exceptionally well suited for use with telescopes. The video signal is read out from the 1-cm silicon target of the vidicon through a current mode preamplifier and then converted to digital form and stored on magnetic tape. The 256 x 256 element frames are recorded at 20,000 ei...

Amptek Inc. Page 1 of 6 Digital Pulse Processors, Theory of Operation R. Redus, Chief Scientist Amptek Inc., November, 2009 Digital Pulse Processors (DPP) are now widely used in high performance nuclear instrumentation and are at the heart of most of the systems sold by Amptek, Inc. A DPP performs the same functions as an analog shaping amplifier but has intrinsic performance advantages which h...

In this paper a study of the noise performance of electret microphone systems as a part of hearing aids is presented. The signalto-noise ratio of the microphone-preamplifier combination, containing a field-effect transistor (FET) and a high value resistive bias element in a hybrid configuration, is mainly determined by the noise generated in the preamplifier circuit. A theoretical analysis of t...

The concept of the measurement system dedicated for air coupled ultrasound navigation study is presented. The proposed system is portable as it is intended for field experiments. In particular, it is planned to use it research, rapid prototyping and signal processing experiments of vehicle parking-guidance systems, transport docking platforms orientation, industrial robotic vision systems and o...

So far the receiver performance analysis assumed ideal rectangular spectra for all of the filters in our system. This chapter analyzes the effect of non-rectangular filter shapes on the receiver sensitivity. Unlike the case of the rectangular spectra analyzed in Chapter 2, the channel seen by the signal and the noise is different now. While the signal path contains two optical filters, one used...