where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

585 views
Technical Discussions
CCChong
Student
University Of Manchester, United Kingdom, Joined Oct 1999, 1

CCChong

Student
University Of Manchester,
United Kingdom,
Joined Oct 1999
1
05:50 Oct-12-1999
ULTRASONIC DATA LINK (ULTRASONIC WIRELESS MOUSE)

My main objective is to design an ultrasonic data link that capable of transparently conveying a low speed binary data signal over a range of few metres (eg.3-4m) with data rates in the region of 2000bits/s.

My second objective is to demonstate the utility of the ultrasonic data communication link by allowing a PC to communicate with its mouse.(ie. wireless PC/mouse interface)

Ultrasonic transducers I am going to use can transmit and receive ultrasonic signals at frequencies of ~40kHz.Following are the specifications for the transducers:

T40-16 R40-16
Transmitter Receiver
Sensitivity (dB) 17±6* -56±6#
Resonant freq. (kHz) 40±1 40±1
Max. input (Vrms) 7 -
Impedance (ohm) approx 200 70k
Capacitance (pF) ±20% 1400 1400
Pulse rise time (msec) 2 0· 5
Max input voltage, pulse
operation: 60V p-p -

* 0dB = 1µBar/V/m
# 0dB = 1V/µBar with 47k shunt
Overall size 15mm dia x 12mm deep (connecting pins protrude a further 9mm) Pins are 10mm apart.


I really I can get some ideas,advices and useful information for my project.The major problem now is what type of method should I use to transmit the digital signal to the receiver in such a narrow bandwidth avaiable??Should I used a microcontroller for this??

PLease provide me with information.I really need helps!!!

Thank you very much.

CCC




    
 
 
Wieslaw Bicz
Wieslaw Bicz
01:26 Oct-12-1999
Re: ULTRASONIC DATA LINK (ULTRASONIC WIRELESS MOUSE)
2 0· 5
: Max input voltage, pulse
: operation: 60V p-p -

: * 0dB = 1µBar/V/m
: # 0dB = 1V/µBar with 47k shunt
: Overall size 15mm dia x 12mm deep (connecting pins protrude a further 9mm) Pins are 10mm apart.

:
: I really I can get some ideas,advices and useful information for my project.The major problem now is what type of method should I use to transmit the digital signal to the receiver in such a narrow bandwidth avaiable??Should I used a microcontroller for this??

: PLease provide me with information.I really need helps!!!

I think, it will be possible to make such link, and it could have some
advantages in comparison with other devices of this kind.

I also think, you will need to use higher frequencies and it will be probably
necessary to design special transducers and a driver for it.

If you are interested in it, we can offer you our cooperation.





    
 
 
Earle Clark
Earle Clark
04:17 Jan-12-2000
Re: ULTRASONIC DATA LINK (ULTRASONIC WIRELESS MOUSE)
Try using a ball on a floating plane transmitting to a receiver! Get away from the "Mouse" and work with the fingers! The ball, conveys the direction of the curser and a pad on either side can transmit a pulse from a pat ..so you may have a flat object in front of the computer..moving the curser (minus the mouse tail) freely! Enhance the transmission..and you can walk aroung the room with a "clip board" and do your screen adjustments!

Just a thought!

Earle sends to you!

: My main objective is to design an ultrasonic data link that capable of transparently conveying a low speed binary data signal over a range of few metres (eg.3-4m) with data rates in the region of 2000bits/s.

: My second objective is to demonstate the utility of the ultrasonic data communication link by allowing a PC to communicate with its mouse.(ie. wireless PC/mouse interface)

: Ultrasonic transducers I am going to use can transmit and receive ultrasonic signals at frequencies of ~40kHz.Following are the specifications for the transducers:

: T40-16 R40-16
: Transmitter Receiver
: Sensitivity (dB) 17±6* -56±6#
: Resonant freq. (kHz) 40±1 40±1
: Max. input (Vrms) 7 -
: Impedance (ohm) approx 200 70k
: Capacitance (pF) ±20% 1400 1400
: Pulse rise time (msec) 2 0· 5
: Max input voltage, pulse
: operation: 60V p-p -

: * 0dB = 1µBar/V/m
: # 0dB = 1V/µBar with 47k shunt
: Overall size 15mm dia x 12mm deep (connecting pins protrude a further 9mm) Pins are 10mm apart.

:
: I really I can get some ideas,advices and useful information for my project.The major problem now is what type of method should I use to transmit the digital signal to the receiver in such a narrow bandwidth avaiable??Should I used a microcontroller for this??

: PLease provide me with information.I really need helps!!!

: Thank you very much.

: CCC




    
 
 
tongfeng
tongfeng
05:54 May-23-2000
Re: ULTRASONIC DATA LINK (ULTRASONIC WIRELESS MOUSE)

Maybe you can try two methods.
The one,you can using a transducer equalizer,that can widen the bandwith of transducer.For example,a FIR
filter can do it.You first train its weights by a ideal
signal,then when inputing real signal,the output is
equalized.That is,the bandwith of system is widened.
Another idea,I think,you can employ FM method.Using
PLL to modulate and de-modulat,realization of 2000bps is not difficult.

tongfeng




    
 
 

Product Spotlight

IK4-IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque technology centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system
...
for the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

EPOCH 6LT

The EPOCH 6LT flaw detector is optimized for one-handed operation in rope access and high-portab
...
ility applications. Lightweight with a grip-oriented weight distribution, the instrument fits securely in a user’s hand or can be strapped to their leg using the rope access accessory kit. The clear, bright screen makes A-scans readable in any light while the intuitive software enables fast navigation.
>

SITEX CPSERIES

Teledyne ICM’s CPSERIES has been designed with a view to revolutionizing the handling and perfor
...
mances of portable X-Ray sets. Despite having managed to halve the weight of similar portable X-Ray generators available on the market (while continuing to provide the same power output), the SITEX CPSERIES generators feature a shutter, a laser pointer, a beryllium window, an aluminum filter and two integrated diaphragms (customized sizes are available upon request). Without compromising the robustness and reliability for which ICM products are renowned, the small size and light weight of the SITEX CPSERIES will radically change the way that you perform your RT inspections. And you will see a positive impact in terms of both quality and return on investment (ROI).
>

Cygnus 6+ PRO Multi-Mode Ultrasonic Thickness Gauge

The Cygnus 6+ PRO thickness gauge is the most advance gauge within the Cygnus range with key featu
...
res including: comprehensive data logging; A-scan and B-scan display; manual gain control; Bluetooth connectivity; and much more. With its unique dual display and three measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this surface thickness gauge offers maximum versatility for inspections.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window
s