• A Chakravarti

      Articles written in Pramana – Journal of Physics

    • An automated ac-magnetic susceptibility apparatus

      A Chakravarti R Ranganathan A K Raychaudhuri

      More Details Abstract Fulltext PDF

      We report here both hardware and software for an ac susceptibility measurement system, namely the design and construction of the cryostat, coil system, sample rod assembly and also the automation of the sample rod movement, bridge control and nulling etc with the help of an inexpensive Z-80A microprocessor via a home-made IEEE-488 interface. The variable parameters are temperature, magnitude of the rms field and frequency. An entirely new dynamic bridge nulling algorithm with continuous sample movement, which eliminates to a large extent problems related to time-dependent drifts, has been developed. We also present some experimental data collected with this system.

    • An automated thermoelectric power apparatus using electro-optic relays

      A Chakravarti R Ranganathan

      More Details Abstract Fulltext PDF

      We report the design and construction of a thermoelectric power apparatus using home-made electro-optic relays with Z-80A microprocessor for automatic data acquisition and control. The advantages of such relays made out of LED-LDR combinations for the measurement of ΔE and ΔT are discussed in detail.

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