Study of a hall effect brake wear sensor using finite element modelling and analysis

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A robust and non-invasive heart-rate monitoring system

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India's largest Fisheries Research Body Turns 70- CMFRI's Legacy and Few Recent Achievements

The Central Marine Fisheries Research Institute (CMFRI), currently celebrating its platinum jubilee year of formation, was established as a Marine Fisheries Research Station on 3'“' February 1947 in Madras. The institute later joined Indian Council of Agricultural Research, (ICAR) family in 1967 and started functioning as a premier research establishment to undertake marine fisheries research in the country. Apart from the estimation of marine fish landings, its valuation and taxonomic studies, the research activities of CMFRI are diversified to a variety of niche areas such as sea farming and coastal mariculture, development of hatchery technologies for commercially viable marine fish species, cage farming, biotechnological applications of marine resources, biodiversity studies, development of sustainable ecosystem management interventions, policy studies and so on. Apart from the Headquarters, the ICAR-CMFRI has 11 Regional Research Centres located at Mandapam Camp, Visakhapatnam, Veraval, Mumbai, Chennai. Calicut, Karwar, Tuticorin, Vizhinjam, Mangalore and Digha (newly established during the 70"' year), in addition to fifteen field centres throughout the coastal belts of the country and 1 KVK at Njarakkal, Ernakulam. The CMFRI team presently comprises of 154 scientists and over 600 other staff working at the CMFRI in as many as 10 research divisions

A novel capacitance-to-digital converter for capacitive sensors with AC excitation

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Supporting the Livelihood of four million fisher folk in Indian marine fisheries - ICAR-CMFRl's recent initiatives

Indian marine fisheries sector is still generating the bulk of its production from the wild capture fisheries leading to employment for nearly four million people, comprising of 8.64 lakh fishermen families dwelling in 3,288 fishing villages along the east and west coasts of the peninsular India. In an earlier study by ICAR-Central Marine Fisheries Research Institute (CMFRI), we could infer that about 611% of coastal fisherfolk were engaged in fishing and allied activities, of which about 38% were active fishermen

A Closed-loop capacitance to pulse-width converter for single element capacitive sensors

A novel closed-loop capacitance-to-pulse width converter (CPC) suitable for single element capacitive sensors that use sinusoidal excitation is presented in this paper. Its operation is realized using a new configuration based on a simple, yet effective, auto-balancing scheme. The hardware prototype of the proposed CPC is relatively less complex to implement than those presented so far in the literature. It provides a quasi-digital output at a high update rate. Additionally, the output is insensitive to parasitic capacitances of the sensor. The output possesses high linearity, with respect to change in the sensor capacitance, ranging +/-5 pF, with a nominal capacitance as high as 200 pF. It exhibits a maximum non-linearity error of 0.061%FS. The output of the prototype has a resolution of 13.31 bits. Also, its response time for a step-change in the sensor capacitance is about 13 ms. This sophisticated and inexpensive closed-loop CPC is a perfect fit as an interfacing circuit for single element capacitive sensors.Peer ReviewedPostprint (author's final draft

Analysis of a direct microcontroller interface for capacitively coupled resistive sensors

© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. DOI:10.1109/TIM.2020.3034969A novel approach to directly interface a capacitively coupled resistive sensor to a microcontroller is presented in this article. The existing measurement schemes for such sensors are complex. In addition, the coupling capacitance often also holds important data. The proposed simple measurement system, for such series RC sensors, is capable of measuring both the resistance and the coupling capacitance. A detailed analysis on the effect of the nonidealities on the resistance measurement showed that it is independent of the accuracy of the charging capacitor, supply voltage, and preset threshold voltagePostprint (published version

An auto-balancing capacitance-to-pulse-width converter for capacitive sensors

A novel auto-balancing capacitance-to-pulse- width converter (CPC) that uses sinusoidal excitation, and operates in a closed-loop configuration, is presented in this paper. Unlike most of the existing CPCs, the proposed interface circuit is compatible with both single-element and differential capacitive sensors. In addition, it provides a pulse-width modulated (PWM) signal which can easily be digitized using a counter. From this PWM signal, a ratio output is derived when a single-element sensor is interfaced, and a ratiometric output is obtained for a differential sensor.The authors would like to thank the Department of Science and Technology (DST), Govt. of India, for its financial assistance (Grant Number SERB/F/4573/2016-17) in carrying out the research activities presented in this paper.Postprint (published version