1.      Technique and Instrumentation for tracing of rock fractures:

 

An attempt was made to trace an existing subsurface fracture using surface electrical measurements. Preliminary experiments were carried out at Maheswaram by suitably exciting a known fracture in a bore well with a low frequency ac current. The potentials on the surface by the current flowing in the fractures were resolved into magnitude, IP, and OP components. The contour showed considerable contrast between wells that are connected by the fracture and the ones that are not connected. This technique needs further changes and refinements in instrumentation as the technique evolves.

 

2.      Automated water level and quality monitoring system:

NGRI has developed a Multi Channel Automated Water Level and Quality Monitoring System mainly for recording important groundwater parameters employing industry standard    water level, conductivity, pH and temperature sensors for unattended long-term recording in observation bore wells.

            The equipment can be used for effective groundwater utilization and management and as well for  pollution

             monitoring  studies.

 

               

 

Specifications:   

 

Recording interval    : Selectable from 1 minute to 12 hours

            Number of channels : Four

            Memory Capacity    : 8500 readings on all for 4 channels or 17,500  readings in case of single channel operation

            Computer                : Fox LP3500 C-programmable SBC with memory and RTC (in the size 66mm x 93mm x

                                               11mm)

            A/D Converter        : 16 bits SPI interface  (0.03% accuracy) 

            Software                 : Windows based user friendly VB Application Software via serial port to control the 

                                             monitoring system, featuring data acquisition, diagnostics and data retrieval using laptop 

                                             computer.

            Dimensions              : 220 X 120 X 80 mm IP 65 Sealed Enclosure.

            Autonomy                : Better than 2 months with 4 sensors at a recording interval of 1 hour    

                                              employing Duracell AA size cells.

            Sensors                    : Any Industry Standard 4/20mA bore hole sensors such as water level, conductivity, pH 

                                              and temperature.

            Deployment             : Near the mouth of well with provision to lock

 

3.      Earlier NGRI has developed instruments like Resistivity meter, Proton Magnetometer, Magnetic Susceptibility Meter,

      Metal detector, Borehole logger etc and transferred the know-how to private agencies. The following Scientists

      1. Sri T.R.M.Prasad, 2. Sri S. Narayana, 3. Sri N.P.Rajendra Prasad, 4. Sri K.K. Bhowal, 5. Sri B.S.Reddy, 

      6. Sri Y.P.Rao,  7. Sri K.Syama Prasad, 8. Late T.Chandrasekhar, 9. Sri B.D.Ramayya, and  Technical Staff

      10. Sri V.Ram Mohan Rao, 11. Md Abdul Sattar, 12. Md A.Ghani, 13. Md G.Zaman and 14. Md Hasnuddin 

      were involved.( Persons from 1 to 2 and 4 to 14 have been superannuated ).