Kishore Sundara-Rajan

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The Wireless Identification and Sensing Platform (WISP) project explores an approach to provide power for sensor networks, based on passive radio-frequency-identification technology. In traditional passive RFID systems, ambient high-power readers interrogate battery-free devices, called tags, that modulate the interrogating signal to communicate a unique(More)
Deployment of passive radio-frequency identification (RFID) systems or RFID-enhanced sensor networks requires good understanding of the energy scavenging principles. This paper focuses on the energy scavenging design considerations of inductively coupled passive HF RFID systems. The theoretical estimation of the power by a loop antenna is derived, and the(More)
This paper reports the first use of ID Modulation to embed a bitstream representing sensor information in a standards-compliant Radio Frequency Identification (RFID) channel. Like other forms of information hiding, ID Modulation embeds a new, lower bit-rate channel in a pre-existing host channel, without requiring any changes to the protocols defining the(More)
This review paper focuses on interdigital electrodes—a geometric structure encountered in a wide variety of sensor and transducer designs. Physical and chemical principles behind the operation of these devices vary so much across different fields of science and technology that the common features present in all devices are often overlooked. This paper(More)
Currently used methods for estimation of moisture content in paper pulp are restricted to levels of moisture concentration below 90%. Some of the existing methods require less practical double-sided contact measurements. A few other methods make restrictive assumptions, such as the constituents of the pulp that determine its conductance. This paper presents(More)
Electronic sensors and various digital devices have been quite successful in improving collection of physical activity data in a pervasive manner, and we believe that advances in dietary assessment can be achieved using similar strategies. Dietary assessment is a critical yet understudied component within the domain of recent advances in electronic health(More)
Dietary intake provides valuable information for understanding the relationship between diet and health. Valid measurement of food volume is one of the most challenging problems in nutrient studies. Computer vision techniques have been used for better evaluation of dietary intake. In this paper, we propose a mobile structured light system (SLS) to measure(More)
Currently used methods for estimation of moisture content in paper pulp are restricted to levels of moisture concentration under 90%. Some of the existing methods require less practical double-sided contact measurements. A few other methods make restrictive assumptions, such as the constituents of the pulp that determine its conductance. This paper presents(More)
Fringing electric and magnetic field sensors are widely used for non-destructive measurements of material properties. A simple conventional fringing field sensor consists of a sensor head, a current or voltage source, an impedance measurement circuit, and data processing/data acquisition capability. The sensor head is usually a patterned array of electrodes(More)