Dual-use ultrasonic sensor

[Dejan Uzelac]

Hi.

I am a univeristy student, making an ultrasonic object detection device...
In it I am using 2 circuits, a transmitter circuit with an ultrasonic
transmitter ,
and a receiver circuit with an ultrasonic receiver...

Now, I have a Dual use ultrasonic transducer on my hands and need to make
use of it
as both, receiver and a transmitter....

Does anyone have schematics for a circuit which allows me to do this, or
knows how can I connect
this single sensor to both circuits and have it switch between them two and
achieve the desired
function???


Any help is greatly appreciated!

Thanx,
Dejan

 

[Don Pearce]

Hi.

I am a univeristy student, making an ultrasonic object detection device...
In it I am using 2 circuits, a transmitter circuit with an ultrasonic
transmitter ,
and a receiver circuit with an ultrasonic receiver...

Now, I have a Dual use ultrasonic transducer on my hands and need to make
use of it
as both, receiver and a transmitter....

Does anyone have schematics for a circuit which allows me to do this, or
knows how can I connect
this single sensor to both circuits and have it switch between them two and
achieve the desired
function???


Any help is greatly appreciated!

Thanx,
Dejan

What exactly is your project? Are you in fact asking us to do it for
you?

d

_____________________________

http://www.pearce.uk.com

 

[Dejan Uzelac]

In fact no...

My project is to make a whole portfolio on some device...
It includes building the prototype and writing up all the reports about it.
We are even allowed to use the kits available on the market and just adjust
them slightly.

My group is making a parking aid device and we want to build it ourselves.
I found some circuits online.. but I have a little problem, as mentioned in
the other post.
I just thought that this would be a good place to ask for help!!!

;-)

Thanx

 

[Darcy Roberts]

Look at the old National Semiconductor LM1812 datasheet. It is no
longer made, so you'll have to find a datasheet in a library.
Also look at application note AB-20, which discusses using an
electrostatic transducer instead of the normal piezo types.

As I recall, having a single transducer meant you'd have to
clamp the transducer to try to stop the ringing and to prevent
swamping the receiver.

regards,
Darcy

 

[Guest]

Hi.

I am a univeristy student, making an ultrasonic object detection device...
In it I am using 2 circuits, a transmitter circuit with an ultrasonic
transmitter ,
and a receiver circuit with an ultrasonic receiver...

Now, I have a Dual use ultrasonic transducer on my hands and need to make
use of it
as both, receiver and a transmitter....

Does anyone have schematics for a circuit which allows me to do this, or
knows how can I connect
this single sensor to both circuits and have it switch between them two and
achieve the desired
function???


Any help is greatly appreciated!

Thanx,
Dejan

Hi Dejan

I am aware of two basic types of ultrasonic transducers.
One is electrostatic and requires about 400 volts to transmit.
The other is piezo electric and can transmit at approx 5 to 20 volts.
Both sensors can transmit and receive with one sensor.
You need to determine what type of sensor you have before you build this
circuit.
Check out the following links.
One is an excellent primer on ultrasonic measurement an describes the Polaroid
electrostatic system.

http://www.acroname.com/robotics/info/articles/sonar/sonar.html

The other shows a piezo system.

http://www.acroname.com/robotics/parts/R93-SRF04.html

Hope this provides some insight

Colin