Conference papers (Engg)
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Browsing Conference papers (Engg) by Author "Sivadas, T.K."
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- ItemAdvances in elelctronics and measurments in fishery technological investigstions(CUSAT, Cochin (India), 1995) Sivadas, T.K.Fishery technology is a multidisciplinary subject warranting integrated approach for its development coordinating a variety of biological and technological disciplines. The complex and hostile nature of the environment where the fishing technological investigations are carried out further necessitates the evaluation of the operational features of the dynamic systems as well as estimation of the physical, chemical, biological and mateorological values of the sea related to fishery resources. The recent developments in microelectronics and space exploration have made revolutionary changes in acoustic fish detection methods, precise navigation, safety in the sea and satellite remote sensing techniques for fishery forecasting. The efforts made in CIFT show the scope and utility of a series of electronic instruments for monitoring the performance of fishing gears, fishing crafts, water quality and the marine environmental parameters. The instruments developed in CIFT using fully indigenous technology are aimed at to make scientific studies on the multidiscplinary nature of the marine environment in relation to the fishing efforts so as to achieve sustainable exploitation of the resources and self reliance in the technology. The paper gives an account of the recent advancements in electronics along with the specific contributions made indigenously.
- ItemElectronic instruments for testing and standardisation of fishing crafts(Society of Fisheries Technologists (India), 1982) Sivadas, T.K.; Ramakrishnan, K.; Vijayabharathi, K.Electronic instruments have been developed indigenously for monitoring the performance of fishing craft to estimate their suitability to different types of gear and load conditions. Three types of instruments are reported namely, bollard pull monitor, speed and distance log and warp load meters. The bollard pull monitor monitors the bollard pull of boats during the bollard pull tests which is the standard test for assessing the capacity of the engine at different r.p.m. The instrument senses bollard pull by means of its load cell and displays the bollard pull in tonnes in a meter kept at a convenient place connected by a two-core cable. A potentiometric recorder to which the signals are fed from the instrument, not only makes permanent records of the bollard pull in graphical from, but also reveals the nature of the power developed clearly. The speed and distance log indicates the speed of motion of the vessel and the total distance travelled. This instrument is needed for assessing the dynamic performanceof the craft. The data from the meter can be fed to recorder for permanent records and precise analysis. Two types of warpload meters are reported namely, portablewarp load meter for use in smaller boats up to 1000 kg and ship-installed warp load meter for permanent installation in large vessels for measurements upto 5 tonnes. The former can be used in all types of boats with in the measurement range much easily without disturbing the routine fishing operations. The design and facilities for feeding the signals to recorders for precise data analysis. All the instruments are fully indigenous and have been relesed for commercialisation. Some typeical data obtained from theinstruments during the static and dynamic tests are also presented.
- ItemElectronic wire telemetering instruments for the engineering studies of otter trawls(Society of Fisheries Technologists (India), 1982) Sivadas, T.K.; Vijayabharathi, K.; Ramakrishnan, K.The paper reports with telemetering instruments for the measurements of depth of operation, angele of attack of otter boards, tilt of otter boards, under water tension for the measurements of the resistance to motion of the different part of the net during operation, mesh size variation and water flow around and inside the net.
- ItemIndigenous instrumentation for collection of field data(Society of Fisheries Technologists (India), 1998) Sivadas, T.K.; Ramakrishnan, K.; Vijayabharathi, K.Technology developed in Central Institute of Fisheries Technology to meet the instrumentation needs in fisheries and agriculture are highlighted. Standardisation of sensors with associated electronics in modular approach has resulted in high flexibility in the selection of different combination for specific aplications. Controls and systems have been developed for operation in single or multichannel format with automatic or manual mode using memory or computer.
- ItemMarine environmental monitoring systems for investigations in fisheries and allied fields(Society of Fisheries Technologists (India), 1982) Sivadas, T.K.The successful implementation of some instrumentation programmes for acquiring marine environmental data are reported. The instruments are used for instantaneous measurements of water current and direction, salinity, temperature and depth of operation. Sensors with novel features were developed and used in water current meter and salinity -temperature-depth meter. The sensors designed with very low impedance and high level signal outputs have rendered the instruments to be quite reliable with comparatively simpler electronics. A sixteen channel data acquisition system designed for automatic of coastal environmental data is reported.
- ItemSolar processing monitor(Society of Fisheries Technologists (India), 1987) Sivadas, T.K.; Ramakrishnan, K.; Vijayabharathi, K.An electronic equipment developed for monitoring the parameters relevant to solar drying of fish namely, water evaporation, air temperature, weight loss and moisture is described briefly in the paper. The special features ad advantages of the equipment are remote operated sensors enabling centralised monitoring, their respective total values over long duration, recording facility and flexibility to accommodate any number of the parameters as required for specific programmes.