We present a read-out system for large mass bolometric detectors. It consists of a differential voltage-sensitive preamplifier having very low series and parallel noise, thanks to the use of a pair of selected silicon JFET
A method for modelling large mass bolometric detectors was developed. It is based on the analysis of the different pulse shapes obtained when a particle deposits its energy in the absorber or in the temperature sensor. SPICE was used for the simulation. Small and large signal analysis is carried on. The model was used for the accurate parameter extraction of two Te02 detectors of 70g and 330g respectively. Results suggest a possible field-effect dependance of the electron-phonon thermal conductance and electron heat capacity in the NTD thermistors used.
An optocoupler with differential input and balanced output was realized to make galvanic decoupling of a particle detector located in a high common mode disturbance environment. The circuit configuration incorporates a true differential optocoupled feedback, with low bias current in LEDs and photodiodes. The present circuit improves by a factor two the dynamic range of a previous solution. Large Common Mode (CMRR) and Power Supply (PSRR) Rejection Ratio, low crossover distortion, high dynamic range, low noise and power dissipation have been achieved.
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