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Interface electronic circuits
As almost all other sensors, radiation detectors need to be interfaced before being able to process the data. An interface or a signal conditioning circuit has a specific purpose: to bring the signal from the sensor up to the format which is compatible with the load device [10]. Cremat Inc. radiation detection electronics can be used with a wide range of detectors, including compound semiconductor radiation detectors, scintillator-photodiode detectors, avalanche photodiodes etc [9].
Typical interface electronic circuit using Cremat amplifiers is presented in Figure 7.
Figure 7.General shematic. Copied from http://www.cremat.com [9].
The Cremat's CR-110 is a single channel charge sensitive preamplifier module intended for use with various types of radiation detectors including semiconductor detectors. Radiation is detected as a series of pulses, resulting in fast bursts of current (from 1ns to few µs) flowing into preamplifier input. After the series of amplifiers it flows into the Cremat's CR-200 Gaussian shaping amplifier. The CR-200 is a single channel shaping amplifier, which is processing the signals from charge sensitive preamplifiers. It accepts a step-like input pulse and produces an output pulse shaped like a Gaussian function (Figure 8). [9.]
Figure 8. CR-200 input and output pulse shapes. Copied from http://www.cremat.com [9].
The main aim of this is to filter the noise from the signal and to provide a quickly restored baseline.
Development in Finland
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