Ultrasonic sonar + computer

Question

Do it yourself

Good afternoon.

I'm wondering if there are ready-made implementations of ultrasonic sonar systems that could be connected to a computer/RasberryPi and then process the output?

How to use sonar to analyze the surrounding space?

Ideally, you need a device capable of scanning a conditional room due to ultrasound and displaying a sane picture on the display.

Answer 1

Before you get interested in the "platform", take an interest in the basic principles of location.
Sonars come in two main types: single-beam and side-scan. The former are capable, as a rule, of producing a signal proportional to the distance to the obstacle in the beam alignment, the latter are only able to produce a map of the reflected signal intensities in the form of stripes located across the scanning direction.
The first one, most likely, will simply “not notice” a mosquito due to the fact that the beam must maintain a diameter comparable to the size of a mosquito within a few meters from the emitter, and you definitely have nowhere to get such a sonar. The second one will definitely not notice, because the angular resolution of such devices is relatively small.
Well, even if you could get a sonar with a thin beam that remains less than a centimeter in diameter at distances within a room, then elementary arithmetic says that in order to detect a mosquito with this beam, you need to completely scan the room. And during this time, the mosquito will easily fly from the area that has not been scanned to the area that has already been. So location with continuous scanning is obviously an unsuitable method.
To detect insects, you need a device that somehow sees the whole picture at once. This can be an optical triangulation tool (two infrared cameras and a backlight) or passive acoustic triangulation. Or a combination of methods - an approximate detection by a passive acoustic method, followed by the inclusion of a directional infrared illumination with a laser (an analogue of the illumination and target tracking radar used in air defense) and accurate triangulation by infrared cameras.
There is also a problem with the means of destruction: firstly, since you did not write that the laser would focus at the right distance, I assume that we are talking about a laser with parallel beams. Therefore, it will burn both mosquitoes and objects in the room (moreover, objects are more successful, because the mosquito absorbs infrared radiation worse than, for example, a wooden cabinet door). Well, you will have to wear safety glasses in this room, because this thing can also leave you without eyes very quickly.

Answer 2

I don't know how bats do it, but it's unlikely that any sonar will give you the desired result.
If we take the average mosquito size of 5 mm, then it is necessary to emit sound at a frequency of not less than 33 kHz. At this frequency, the lion's share of the emitted wave will be absorbed by the environment + extraneous interference.

Answer 3

There is one caveat - mosquitoes hear ultrasound and fly away, the self-preservation instinct works. It is this effect that is used in ultrasonic repellents.
In any case, scanning sonar with a very narrow radiation pattern is needed to detect an object a few millimeters in size. Well, plus quite capacious work for a programmer. I'm afraid this task is feasible only in ideal conditions.
www.youtube.com/watch?v=YnSKrzmpKGw

Answer 4

An ultrasound sonar can be connected directly , or you can use the same arduino
, but you won’t be able to notice a mosquito with such a sensor :)

Answer 5

Don’t you think that it’s better not to scan, but to listen to the “squeak” of mosquito wings on several receiving devices? Well, then it's a matter of triangulation.

Answer 6

Various companies have been spending a lot of money on solving this problem for several years, and there is no ready-made solution yet.
As already mentioned above, the locator must have a very narrow radiation pattern, which is not typical of ultrasonic locators at all.
Using triangulation, it is easier to determine the position, but such a device, most likely, should work in complete silence.
Nothing is said about the safety of such a system - a laser that burns mosquitoes will be very dangerous for a person.