Journal ArticleDOI
Coded ultrasonic remote control without batteries
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TLDR
In this article, a concept for battery-less remote control based on mechanically actuated beams and micro whistles generating ultrasound signals has been developed, which need to be frequency or time coded to increase the number of signals which can be distinguished from each other.Abstract:
A concept for battery-less remote controls has been developed based on mechanically actuated beams and micro whistles generating ultrasound signals These signals need to be frequency or time coded to increase the number of signals which can be distinguished from each other and environmental ultrasound Several designs for generating coded ultrasonic signals have been investigatedread more
Citations
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Journal ArticleDOI
Review on ultrasonic fabrication of polymer micro devices.
TL;DR: For large-scale production role-to-role fabrication has been shown reducing costs even more and investment costs and energy consumption are comparatively low and processes are very flexible enabling economic fabrication even for small- scale production.
Book ChapterDOI
Ultrasonic Hot Embossing and Welding of Micro Structures
TL;DR: In this paper, hot embossing allows the fabrication of micro structures from polymer films by molding from a master tool and the fabrication process is completed within seconds and the investment costs are low.
Proceedings ArticleDOI
Position detection with micro whistles
TL;DR: In this paper, the authors describe the design and detection of mechanically actuated micro whistles not equipped with any electronics, which are fabricated by ultrasonic hot embossing of thermoplastic foils.
Journal ArticleDOI
Position detection and remote controls powered by micro whistles
TL;DR: In this article, the authors describe the design and detection of mechanically actuated micro whistles not equipped with any electronics, and demonstrate how to overcome obstacles such as accidentally generated ultrasonic noise, frequency shifts due to changing activation forces of the whistles and distinguishing the signals of different whistles.
Journal ArticleDOI
Vortex Whistles Employed as Remote Micro Flow Sensors
TL;DR: In this paper, it was shown that at high flow rates the frequency increases with the density of the gas and that the frequency is not proportional to flow velocity but is bowed similar as a root function, therefore it is not very sensitive as vortex whistles at larger flow rates.
References
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Journal ArticleDOI
The variation of the specific heat ratio and the speed of sound in air with temperature, pressure, humidity, and CO2 concentration
TL;DR: In this article, a precise numerical calculation of the specific heat ratio and speed of sound in air as a function of temperature, pressure, humidity, and CO2 concentration is presented.
Journal ArticleDOI
On the mechanism of sound production in organ pipes
TL;DR: In this paper, it was shown that both the Cremer Ising and Coltman mechanisms for sound production in organ pipes are comprehended by a more general approach, based on conservation of linear momentum.