Hybrid control and acquisition system for distributed sensors for environmental monitoring
2007
In this paper we describe the architecture and the performances of a hybrid modular acquisition and control
system prototype we developed in Napoli for the implementation of geographycally distributed monitoring and
control systems. The system, an improvement of a VME-UDP/IP based system developed by our group for
interferometric detectors of gravitational waves, is based on a dual-channel 18-bit low noise ADC and 16-bit DAC
module at 1 MHz, managed by an ALTERA FPGA, that can be used standalone or mounted as mezzanine (also
in parallel with other modules) on a motherboard. Both the modules and the motherboard can send/receive
the configuration and the acquired/correction data for control through a standard EPP parallel port to an
external PC, where the real-time computation is performed. Experimental tests have demonstrated that this
architeture allows the implementation of distributed control systems, using a standard laptop PC for the realtime
computation, with delay time D t < 30 ms on a single channel, that is a sustained sampling frequency
f c > 30 kHz . Each module is also equipped with a 20-bit slower ADC necessary for the acquisition of an
external calibration signal. The system is now under extensive test in two different experiments, i.e. the control
of a Michelson Interferometer to be used as Velocimeter for Seismic Waves in Geophysics and the control of the
end mirrors a suspended Michelson Interferometer through electrostatic actuators, a prototype for mirror control
for Interferometric Detectors of Gravitational Waves.
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