Using Ultrasonic Sensor for a time/intensity correlation

Other Hardware Sensors
1

Hallo,

I want to use the ultrasonic sensor HC-SR04 or any other you can recommend for this purpose, for receiving the raw output of the sensor, so i have a time/intensity correlation (if my surrounding doesn't change) for each measurement.
Can I use the HC-SR04 sensor for that, or do i need another?
does a Ultrasonic sensor fit my purpose at all, or do the most materials used have only a negligible transitivity of ultrasonic waves?

Thanks in advance

2

Common HC-SR04 has a comparator built in, saying raw do you mean ultrasonic frequency before it gets into comparator?
There are online schematic of HC-SR04 posted all over, probably you could describe in more details your question using one of them.

3

Hm, ok. - I hate to admit it, but I am not able to retrieve the relevant information out of the schematics.
And I did not plan to attach some cables within the Sensor to modify it to my purpose in that way. but it basically answers my question i guess. - it wasn’t build for such use.
By raw i mean:
Say you have two objects of similar size at different locations within the 15° angle of the HC-SR04, but not behind each other. I than should get two peaks (of intensity) of reflected Sound at different times The first of larger, the second smaller, depending on the sr. - One being reflected by the first, the later by the second. Right?

I would like to have such an output - basically a set of data, giving the reflected sound at given time-intervals.

4

jomann380:
Say you have two objects of similar size at different locations within the 15° angle of the HC-SR04, but not behind each other. I than should get two peaks (of intensity) of reflected Sound at different times The first of larger, the second smaller, depending on the sr. - One being reflected by the first, the later by the second. Right?

I would like to have such an output - basically a set of data, giving the reflected sound at given time-intervals.

Wrong. The first peak would be from the object that closer to sensor. Size defines only magnitudes of peaks, distance - time.
If both object located on same circumference, than reflected waves collide into single peak.
You have to construct your own sensor or modify existing one. I haven't seen any with analog outputs.

5

Ok, I thought I did say so.
I guess we agree on short distance~short time.
I did forget about interference...

Thanks, for all your input.
Maybe I will find time for constructing my own sensor eventually. :slight_smile:

6

The HC-SR04 returns the first peak it detects and shuts down. There are other sensors, such as the Polaroid SMT 6500 ranging sensor, that return multiple peaks. They don't return echo amplitudes, though.

Are you trying to build a sonar mapping device?

7

Echolocation has been done with the HC-SR04, but not that much. A quick Google search turned up this: