Simulation Of Transmitters and Phase Delay Calculations
Pardon me , sir for keeping you in the dark for all this time but i needed to get something conclusive before submitting the results. I have completed coding the simulation for the ultrasonic transmitters which is also capable of calculating the phase delay for n number of transmitters (as of now limited to linear ,array not yet implemented) and also capable of transmitting this data to an arduino(still have to figure out the character encoding and flushing the serial buffer but the code is complete). The link to the code is https://github.com/1sand0s/Inter_Haptics/tree/master/IS_UltraSonic/src/IS_UltraSonic.
The link to the video showing the implementation is below:-
https://youtu.be/lzrv-VvoatU
As shown in the diagram , in order to change the directivity or the angle of the principle maximum ,the transmitters are excited at different instances thereby causing constructive interference at different points and hence changing the orientation of the maximum. Lx is the distance from the transmitter at nth position to the focal point and R is the distance from the central transmitter , so Lx is compared with R and the transmitter is either set back or advanced by a factor ((mod(Lx-R))/speed) and this phase delay results in a constructive interference at the desired point.
The link to the video showing the implementation is below:-
https://youtu.be/lzrv-VvoatU
As shown in the diagram , in order to change the directivity or the angle of the principle maximum ,the transmitters are excited at different instances thereby causing constructive interference at different points and hence changing the orientation of the maximum. Lx is the distance from the transmitter at nth position to the focal point and R is the distance from the central transmitter , so Lx is compared with R and the transmitter is either set back or advanced by a factor ((mod(Lx-R))/speed) and this phase delay results in a constructive interference at the desired point.
Are your calculations for only 2 transducers? Or do you know that they work with n transducers? And I am still curious about whether the carrie frequency needs to be modified or whether the amplitude modulation is sufficient. This is AM vs FM. The transducers don't seem capable of FM.
ReplyDeletethey work for n number of transducers and amplitude modulation is sufficient. I went through a paper presented by Mr Takayuki Iwamoto, i have mailed you the pdf, according to his work into mechanoreceptors of human hands ,they are most sensitive to vibrations of 190-200hz, but the resonant frequency of these sensors are 40khz which won't be sensed by our hands . So AM of the 200hz single onto the 40khz should do the job
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