Material Read In First Week Of June
Through the various papers referred , i have inferred the following points
Transmission:
As specified before , i intended to use the 40khz ultrasonic transmitter from murata-MA40S4S
(i have ordered in bulk after it perfectly suited the need for the project with the favorable directivity and sound pressure level) .For the sake of clarity i recapitulate ,they basically contain quartz crystals which undergo deformation upon application of an AC wave and if the frequency of the applied AC wave coincides with the resonant frequency of the crystal ,the amplitude of the output mechanical disturbance(ultrasonic wave) is maximum .However tiny receptors embedded in our skin called mechanoreceptors
are incapable of detecting vibrations at a frequency of 40khz, it is most sensitive in the frequency range
Therefore i plan to modulate the AC 40khz sinusoid with the amplitude of a 100-200 Hz sinusoid and hence creating a multi-frequency wave which is then amplified to 15Vp-p and fed to the transmitter
Focal Points
This is what i am focusing right now on, reading up material on phase-plane and basically try to correlate the points of constructive interference to the phase differences of the transmitter to form the focal point and eliminate the background noise
Through the various papers referred , i have inferred the following points
Transmission:
As specified before , i intended to use the 40khz ultrasonic transmitter from murata-MA40S4S
(i have ordered in bulk after it perfectly suited the need for the project with the favorable directivity and sound pressure level) .For the sake of clarity i recapitulate ,they basically contain quartz crystals which undergo deformation upon application of an AC wave and if the frequency of the applied AC wave coincides with the resonant frequency of the crystal ,the amplitude of the output mechanical disturbance(ultrasonic wave) is maximum .However tiny receptors embedded in our skin called mechanoreceptors
Focal Points
This is what i am focusing right now on, reading up material on phase-plane and basically try to correlate the points of constructive interference to the phase differences of the transmitter to form the focal point and eliminate the background noise
Does the mathematics show that the phase differences in the modulation of the carrier frequency will in fact allow you to direct the beam? Or does it require being the phase of the underlying 40 khz carrier?
ReplyDeleteHave you seen any references of people modulating a 40 khz carrier to do the haptics and you are replicating their work for implementation in IS?
The ultrahaptics team implemented it with 40khz transducers,in their paper, they have stated that ,they did try with 20khz transducer however due to low SPL it wasn't felt effectively. For a linear arrangement ,the maths does comply with the expected results and the phase difference of the amplitude modulated wave is the key principle defining where or if the pressure point is formed
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