IoT applications utilizing excess heat in electrical lighting fixtures

The development of IoT instrumentation will always be strongly influenced by the properties of the power supply system. A large number of IoT nodes creates a danger of extra expenditures when changing the battery. For this reason, the development of supply nodes tends to prefer systems capable of battery-less operation, obtaining energy from other sources. This article deals with an alternative method of electrical energy acquisition form the excessive heat appearing in LED lighting fixtures utilizing large-area LED chips. A Peltier cell was used for the conversion of heat energy to electrical energy, connected as thermo-electric generator into the thermal chain

Energy consumption optimization for thermal energy harvester applications

This paper demonstrates the concept of node consumption reduction for IoT applications. The main emphasis is placed on the autonomy of the whole device, which must be independent of external power supply. That is why energy harvesting based on temperature principle is used for power supply. One of the parameters monitored is the service uptime. The concept of intelligent control of the individual parts of the equipment leads to significant energy savings. This control requires the use of low power components, but only their appropriate connection and mutual monitoring of their operating modes leads to the desired savings. This algorithm can be adapted to the needs of IoT nodes focused on real-time performance applications or the process tracking slow low power applications. This concept will ultimately be adapted to a wireless node for monitoring position and temperature for use in medical applications to monitor the patient's position on the bed or position while moving

IoT applications utilizing excess heat in electrical lighting fixtures

Vývoj IoT zařízení bude vždy silně ovlivněn možnostmi napájení systému. Značný počet uzlů IoT (node) vytváří nebezpečí dodatečných nákladů při výměně baterii. Z tohoto důvodu se vývoj napájení uzlů zaměřuje na zařízení, která mohou pracovat bez baterie a energii získávají z jiných zdrojů. Tento článek se zaměřuje na alternativní získání elektrické energie z odpadního tepla vznikajícího při provozu LED svítidel obsahující velkoplošné LED čipy. Pro konverzi odpadní tepelné energie na elektrickou energii je využit Peltiérův článek zapojený ve funkci termogenerátoru do teplotního řetězce.The development of IoT instrumentation will always be strongly influenced by the properties of the power supply system. A large number of IoT nodes creates a danger of extra expenditures when changing the battery. For this reason, the development of supply nodes tends to prefer systems capable of battery-less operation, obtaining energy from other sources. This article deals with an alternative method of electrical energy acquisition form the excessive heat appearing in LED lighting fixtures utilizing large-area LED chips. A Peltier cell was used for the conversion of heat energy to electrical energy, connected as thermo-electric generator into the thermal chain

Extrudované antirezonantní optická vlákna s dutým jádrem z teluritu pro střední infračervenou oblast

We report the first extruded tellurite antiresonant hollow core fibers (HC-ARFs) aimed at the delivery of mid-infrared (Mid-IR) laser radiation. The preform extrusion fabrication process allowed us to obtain preforms with non-touching capillaries in a single step, hence minimizing thermal cycles. The fibers were fabricated from in-house synthetized tellurite glass (containing Zn, Ba and K oxides) and co-drawn with a fluorinated ethylene propylene (FEP) polymer outer layer to improve their mechanical properties and protect the glass from humidity. The fabricated HC-ARFs transmit in the Mid-IR spectral range from 4.9 to 6 mu m. We measured losses of similar to 8.2, 4.8 and 6.4 dB/m at 5 mu m, 5.6 gm and 5.8 mu m, respectively in two different fibers. These losses, which are dominated by leakage mostly arising from a non-uniform membrane thickness, represent the lowest attenuation reported for a tellurite-based HC-ARF to date. The fibers present good beam quality and an M^2 factor of 1.2. Modelling suggests that by improving the uniformity in the capillary membrane thickness losses down to 0.05 dB/m at 5.4 gm should be possible, making this solution attractive, fbr example, for beam delivery from a CO laser.Tento článek se zabývá extrudovanými antirezonantními optickými vlákny s dutým jádrem z teluritu pro přenos laserového záření ve střední infračervené oblasti (HC-ARF). Proces výroby vytlačování předlisku nám umožnil získat předlisky s nedotýkajícími se kapilárami v jednom kroku, čímž se minimalizovaly tepelné cykly. Vlákna byla vyrobena ze syntetizovaného skla z telluritu (obsahujícího oxidy Zn, Ba a K) a společně tažena s vnější vrstvou polymeru z fluorovaného ethylenpropylenu (FEP), aby se zlepšily mechanické vlastnosti a sklo chránilo před vlhkostí. Vyrobené HC-ARF byly použity pro přenos ve spektru Mid-IR od 4,9 do 6 um. Byly naměřeny ztráty blízké 8,2, 4,8 a 6,4 dB / m při 5 μm, 5,6 gm a 5,8 μm, a to ve dvou různých vláknech. Tyto ztráty, kterým dominuje netěsnost většinou způsobená nerovnoměrnou tloušťkou membrány, představují doposud nejnižší útlum zaznamenaný pro HC-ARF na bázi teluritu. Vlákna vykazují dobrou kvalitu paprsku a faktor M^2 1,2. Modelování naznačuje, že zlepšením rovnoměrnosti v tloušťce kapilární membrány by mělo být možné ztráty snížit až na 0,05 dB / m při 5,4 gm, což by mělo učinit toto řešení atraktivním, například pro dodávku paprsku z CO laseru

Experience in System Design for Human-Robot Teaming in Urban Search and Rescue

The paper describes experience with applying a user-centric design methodology in developing systems for human-robot teaming in Urban Search and Rescue. A human-robot team consists of several semi-autonomous robots (rovers/UGVs, microcopter/UAVs), several humans at an off-site command post (mission commander, UGV operators) and one on-site human (UAV operator). This system has been developed in close cooperation with several rescue organizations, and has been deployed in a real-life tunnel accident use case. The human-robot team jointly explores an accident site, communicating using a multi-modal team interface, and spoken dialogue. The paper describes the development of this complex socio-technical system per se, as well as recent experience in evaluating the performance of this system