Here, we employed two identical, focusing US transducers (Panametrics, V394-SU-F50MM-PTF) operated in continuous mode with a small and adjustable frequency difference; one at ν1 = 1 MHz and the other at ν2 = ν1 + Δ ν (with the possibility of Δ ν to be fixed accurately in the range 100 – 1200 Hz).
It is easy to control the growth rate and avoid materials from pollution as a result of the adjustable frequency of pulsed laser and the good directivity of laser-ablated plasma [13, 14].
The optical system adopted a solid-state laser with adjustable frequency of 1 2000 Hz and spots of 20 100 μm.
However, we would like improve this by adding a User Interface that would allow adjustable frequency in the future.
A compact nano-power fourth-order bandpass filter operating from a 0.5 V supply, with an adjustable center frequency ranging from 125 Hz to 16 kHz, is presented.
As a result, low-pass filters with an adjustable cutoff frequency ranging from 82 Hz to 740 Hz were obtained, demonstrating their suitability in signal filtering and their promising applicability for tactile sensing characterized by low frequency signals.
The all-inkjet-printed low-pass filters were characterized and an adjustable cutoff frequency feature in form of an inkjet-printed organic thin-film transistors (OTFTs) was added to the filters for application-oriented fine-tuning.
The adjustable frequency range could be up to ±30% and this was significant from a comparison with the existing literature.
In this work, a novel design for small vibrotactors called the Dual Excenter is presented, which makes it possible to produce vibrations with independently adjustable frequency and amplitude.
