Electronics > Projects, Designs, and Technical Stuff
Radar to detect mosquitoes?
RoGeorge:
--- Quote from: MasterTech on July 30, 2020, 11:15:02 am ---
--- Quote from: RoGeorge on July 30, 2020, 11:10:21 am ---Meanwhile, 10 years ago
:D
--- End quote ---
Good system, although I don't think it has been developed. However the idea of using a light mesh is also valid to detect 'intruders'
--- End quote ---
I think it was developed already, but for some reason it was not practical. I remember seeing a video (not sure if it was from the same company) where in a window frame there was a setup with some mosquito detector (again, don't recall if it was radar or video detection), then burning down the mosquito with an automatically aimed LASER.
However, since 10 years later we still don't have this, might seem it was not very reliable, or maybe it was too expensive when compared with chemical solutions.
Another anti mosquito method I remember was to release a huge number of sterile male mosquitoes in the wild, male mosquitoes that were sterilized by a lab (sterile as in not been able to impregnate the mosquitoes females, therefore not being able to reproduce). The sterilized mosquitoes were supposed to compete with the fertile male mosquitoes already existing in the wild (and they did compete), therefore the total number of mosquitoes offspring will drop. And they did. It's a method already practiced in some places of the world, AFAIK.
Berni:
Another way to stop them from getting trough a window is to simply put a bug mesh over the window. Cheap, simple, reliable.
mrflibble:
--- Quote from: Berni on July 30, 2020, 12:38:34 pm ---Another way to stop them from getting trough a window is to simply put a bug mesh over the window. Cheap, simple, reliable.
--- End quote ---
Or just nuke the site from orbit. It's the only way to be sure.
And on the off chance that your nuclear stockpile is running a little low, like RoGeorge I also recall an older system using cameras for detection and lasers to zap those pesky mosquitoes out of the air.
https://youtu.be/fH_x3kpG8Z4?t=30
radar_macgyver:
Sticking to monostatic radar, you'd be limited more by antenna directivity than the fact that they're smaller than the wavelength; weather radar operating at 2.8 GHz can easily detect insects up to about 10 km. Rayleigh scattering allows you to detect particles much smaller than lambda.
https://www.radartutorial.eu/01.basics/Rayleigh-%20versus%20Mie-Scattering.en.html
However, to get a reasonable angular resolution (let's say, 10 degrees), one would need a ~1 meter diameter aperture - not exactly practical. Going to 60 GHz, you would only need a 5 cm aperture (at which point the approximations I used for beamwidth would likely fall apart). By sampling at a higher resolution than the beamwidth, one could fit a gaussian and get a better estimate of the target position in azimuth.
60 GHz parts are getting affordable, but phased arrays at those bands are still Bell-labs type stuff; I think they were able to demonstrate a TX array at 94 GHz a couple of years ago. You can buy a 28 GHz dev kit with 256 elements from Anokiwave/Ball Aerospace.
Finally, the really hard part would be figuring out how to reject multipath from the walls, roof, furniture, etc. Depending on mosquito density, living inside an anechoic chamber may not be too much of a compromise ;D
atmfjstc:
Seems to me more practical to detect them by triangulating their "regular" (i.e. non-ultrasonic) sound emissions.
Just imagine the satisfaction of trying to go to sleep in your room and hearing:
"buzzzzzzzzzzz.... KKERZAAP!! *dead silence*"
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