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Poster Session 2
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A simple technique for classifications of earth resources using DOPD silion
Exposure (fig 1 ). The base terminal was not used and the emitter collector terminals were connected to an amplifying circuit Hooked with an oscillator. Finally the circuit ends in a loud speaker capable of producing audio vibrations. An accurate digital meter was connected to measure the output of the circuit before it is fed to the loud speaker. Thus a millimeters and a loud speaker both serves as detectors (Fig 2 and Fig 3). He-Ne Laser light was allowed to fall on one of the ground resources say grass, the reflections from this grass were made incident on the doped silicon of the transistor through a reflector mirror. The output was measured by a digital meter; similarly vibrations were heard from the loud speaker to the experiment was repe\ated with different wavelengths including visible and infrared for different earth resource materials. It is observed that the sensing response is different for different resources /3,4/.
Results and Discussions
The measurements of output voltage and sound intensity variation give indication for a particular earth resource. Different resources give different output voltages and sounds. This is evident from the sensing properties of doped silicon. It is observed that the infrared response is better in some earth resources. Thus the classification of earth resources can be done in a laboratory for different earth resources using doped silicon. In addition the experiments were performed with other transistors of the series, namely BC 108 and BC 109. Experimentally it has been confirmed that the detection of different earth resources can be done equally well with these transistors too. This is encouraging and offers a simple technique for studies on remote sensing even in a small laboratory. Further this also serves a demonstration method of the phenomenon of remote sensing in a class room /5/
Acknowledgement
Author is thankful to Council of Scientific and Industrial Research, New Delhi for sanction of financial grant under a scheme CSIR 8(31)/(85) EMR-II
References
- V. K. Farkya, Remote sensing Applications,
Science and Society, Vani Eduational Publishers, India, P. 53 (1985)
- A. J. Dekker, Electrical Engineering Material,
Prentice-Hall of India, New Delhi, P. 176 (1969).
- Pietritz Richard D. L., Fundamentals of Infrared
Detectors, IEEE 47, 1458 (1966).
- Putley E.H./, Solid State for Inffrared
detection J. Sc. Instr. 43, 865 (1966)
- V. K. Farkya, Rekha Agrawal and Rubeena Saheen , On Properties of detector silicon, Microelectronics Yugoslavis (1989)
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