3.2 Passive infrared sensor (PIR sensor) A PIR sensor is an electronic sensor used in motion detectors such as automatically triggered lighting devices and protection systems that measure devices emitting infrared light in their field of view. Each body with a temperature above zero releases heat energy, which is in the form of radiation. PIR sensors detect infrared radiation that is reflected ...
PIR sensors offer a non-invasive method that ensures the safety and confidentiality of individuals, making them a preferred choice for privacy-conscious monitoring solutions. By emphasizing privacy preservation and cost-effectiveness, this study highlights the advantages of using a single PIR sensor for comprehensive human activeness monitoring.
For the PIR sensor, coverage area, sensitivity, angle of view, and responsitivity are the main criteria required for better sensor performance. The dominant one is the sensitivity, which is the measure of the change in output to unit change in input of the sensor.
The article reviews signal processing applications of Pyroelectric Infrared (PIR) sensors with the main focus on the respiration and pulse rate detect…
PM2.5 pollution has been associated with the incidence of lung cancer, but the underlying mechanism is still unclear. PIWI-interacting RNAs (piRNAs), …
The use of polyisocyanurate (PIR) foams as a substitute for polyurethane (PUR) is steadily growing for insulation, flooring, and roofing applications, given PIR's higher flammability performance [1, 2], low cost, and outstanding thermal insulation properties. Polyisocyanurate molecular structure consists of highly crosslinked isocyanurate rings, which enhance thermal stability, flame ...
For these reasons, PIR and thermopile sensors are also viable options for location estimation in an indoor environment such as home and office buildings. There are a substantial number of papers that proposed passive infrared-based location estimation.
PIR gains much of its thermal resistance value from the blowing agents, often a pentane gas mixture, which is trapped in the foam cells [4, 5]. Pentane isomers are commonly used in Europe in manufacturing of rigid insulating polyurethane foams.
Even if the presence of thermal gradients in PIR foams and its influence on isocyanurate content have been discussed a few times in the literature, a detailed analysis of the chemical gradients existing in the thickness direction (rise direction) of PIR foams using ATR-FTIR is still lacking.
Passive infrared hemoencephalography (pIR HEG) and near infrared hemoencephalography (nIR HEG) are noninvasive, photon-based forms of neurofeedback. T…
