Articles written in Pramana – Journal of Physics
Volume 2 Issue 4 April 1974 pp 226-228 Instruments And Techniques
Crystal shape effect on nuclear orientation thermometry at ultra-low temperatures
T S Radhakrishnan Girish Chandra
Absolute temperature measurement (
Volume 25 Issue 1 July 1985 pp 11-20 Quantum Mechanics
Design and development of a superconducting magnet system for study of magnetoresistance in the temperature range 1.5–300 K
A K Nigam S Sundaram Girish Chandra
The design and fabrication of an all-metal cryostat, superconducting magnet and variable temperature sample holder insert for the measurement of magnetoresistance at temperatures in the range 1.5–300 K are described. A field of 50 kilogauss has been achieved at the centre of a one-inch bore superconducting solenoid and has a uniformity of 0.2% over an axial distance of 20 mm around the centre of the solenoid. Also, the design and construction of vapour cooled current leads for the magnet are discussed.
Volume 40 Issue 2 February 1993 pp 123-127
Simple and inexpensive3He insert for an ac susceptometer
S Ramakrishnan K Ghosh Girish Chandra
The design of a simple and inexpensive3He insert for the existing ac susceptometer is described. The system uses a home built mutual inductance bridge for the ac susceptibility measurements from 0·4 K to 300 K. Simple and inexpensive design with the top loading facility are the main features of this set up. The insert can also be used as a continuously3He operating refrigerator down to 0·5 K.
Volume 45 Issue 1 July 1995 pp 81-89
A low cost PC based card for heat-capacity measurements at low temperatures
R S Sannabhadti S Ramakrishnan K Ghosh Arun Patade Girish Chandra
We describe a simple, low cost pc based card for the measurement of heat capacity using adiabatic calorimetry at low temperatures. This card provides the control pulse to the sample heater as well as trigger pulse to the nano-voltmeter which monitors the sensor voltage (Ge sensor, Lake Shore Inc., USA). We have also added a 12 bit DAC on this card and this is used for remote setting of the heater current of an old SHE (now Biomagnetic, Inc., USA, model CCS) analog constant current source. Although this card is used here for heat-capacity measurements, the same can also be used for thermo-power and thermal-conductivity measurements.
Volume 97, 2023
Continuous Article Publishing mode
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