Ultrasonic transducers play a significant role in generating and receiving the acoustic waves in ultrasonic flowmeters. Depending on the required accuracy, the ultrasonic transducers can be installed either in one pair or more in an ultrasonic flowmeter. The main part of an ultrasonic transducer is its piezoceramic element. In this work, four piezoceramic elements with different diameter to thi...

This article proposes a measurement system controlled by microcontroller unit (MCU) for the electronic reading of mechanical gas meter. The relies on dual magnetic sensing: 1) low-cost low-power primary sensing based reed switches connected to digital inputs MCU, and 2) secondary Hall-effect sensors analogue MCU. In addition, both strategies have an active passive element achieve output insensi...

With the upcoming widespread distribution of smart meters for electricity, gas and water consumption, new opportunities are closely linked to new privacy concerns. In this paper, we present protocols that can be used to privately compute aggregate measurements, allowing for fraudand leakage detection as well as statistical evaluation of meter measurements, without revealing any information abou...

We demonstrate a new principle of optical trapping and manipulation increasing more than 1000 times the manipulation distance by harnessing strong thermal forces while suppressing their stochastic nature with optical vortex beams. Our approach expands optical manipulation of particles into a gas media and provides a full control over trapped particles, including the optical transport and pinpoi...

Expired volume was measured with a Godart pneumotachograph at the expiration port of the ventilator (Fig 1, tracing 5). We measured the concentration of helium with a katharometer (Codart, response time 0.1 see), at the expiration port of a Siemens-Elema-900 ventilator. From equations 2 and 3, it follows that absolute calibration of the helium meter is not necessary; only linearity of the meter...