Which laser listed below will allow you to detect all three

Which laser listed below will allow you to detect all three insects listed below? Why? Insect wing frequency (flaps/s) (mosquitos) 500 (cold honey bees) 180 (warm honey bees) 250 Laser pulse rate (pulses/s) Laser\"a\" 30 Laser\"b\" 800 Laser \"c\" 2000

Solution

Laser \"b\" - 800 pulses/s

Let me give you the reason.

The sensor allows monitoring populations of insects that are harmful to the health of humans or damage agriculture and the environment,

Flying insects beat their wings at different speeds, according to their size and other morphological characteristics, and at acoustic frequencies that typically vary between 100 and 1,500 Hertz,”

  

\"Idea was to develop a system that could identify the acoustic frequency of various flying insect wingbeats in addition to other information we could use to classify the insects.”

Sensor function

The researchers developed a sensor that consists of a low-powered laser beam aimed at an array of phototransistors – similar to a laser beam pointed at a wall.

As the insect flies between the laser beam and the phototransistor array, its wings partially block the light and cause small variations in it.

Oscillations in the light caused by an insect’s wings are captured by the phototransistor array. The signals are similar to audio signals, such as those captured by a conventional microphone. The difference is that they are produced not by the variation of the sound waves but by the variation of the light.

The signals extracted by the sensor are filtered and amplified through an electronic circuit board. Using a digital sound recorder connected to the board output, it is possible to record the signals in audio files and transfer them to a computer for analysis.

“Each species of flying insect produces a slightly different signal. This allows a computational comparison of each of the different species,”

For better detection and processingof signals, selection of laser pulse rate should be just above the wing frequency.... So in our above mentioned problem we have three insects with different flap rate. To detect all the three insects we choose a laser with a pulse rate of 800 pulses/second. It varies when we consider the individual insects.

Thank you very much for giving an opportunity..