Infrared sensor array to detect mosquito entry

[Vizier87]

Hi everyone.

I've been attempting to construct a simple mosquito entry sensor array using infrared photodiode pairs. They kinda worked, but the problem is the line of detection is too fine.

Ideally, the opening where the mosquitoes enter/exit is about 10cm x 10cm. That's where the sensors are installed.

I just wonder before I engineer the heck out of the setup, are there readily available sensor arrays I can use which work?

And yes, I have used cameras before. They work, but sometimes those bugs zip past through too fast and it doesn't detect it .

Appreciate the input.

Vizier87

 

[danadak]

I wonder if wing beat frequency could be basis for detection.....

Currently image recognition would work, buts escalates costs/complexity.

 

[Tony Stewart]

With a 200 mm X+Y linear aperture, you might see a < 0.1% shift in transmitted light down in your noise level and need a very low reflected background for reflected light. An audio mic and bandpass filter would be needed with two back-to-back mics for the direction of motion and confirming they enter or exit to hear the bzzz like when you are sleeping.