Ultrasonic mosquito repellent device

Ultrasonic mosquito repellent device

• Human ear

  
  

  The human ear can clearly hear sounds with frequencies between 20 Hz and 20 kHz while all sounds below 20 Hz or over 20 kHz (20,000 Hz) are faded. For this reason, audio designers develop what is called an electronic filter to pass the audio frequencies only, as is the case in computer sound cards, for example.

  Hearing in animals

  The degree of hearing in animals varies from one species to another.

  The bat ': It generates ultrasound waves of up to 100 kilohertz and then listens to them to create a picture of the surrounding objects.

  Dog: can hear sounds of higher frequency than human hearing.

  Fish: Some fish listen to sounds at frequencies up to 180 kilohertz, and others only up to 4 kilohertz. 

  Ultrasound frequency applications

  Ultrasound generators and ultrasound sensors can be designed for use in a wide variety of industrial and medical applications, such as:

  War Fields: It is used to detect landmines

  Industrial fields: sterilization of water and milk

  Medical fields:

  Detecting cancerous tumors.

  Diagnosis of an enlarged prostate gland in men and its effect on the bladder.

  Detecting the condition and sex of the fetus using ultrasound * Dissolving kidney and ureter stones without performing surgeries.

  4. Non-industrial CND monitoring to detect deformations and cracks inside materials, a technique that is considered modern in the field of infrastructure maintenance such as bridges, tunnels and buildings. It is also used in nuclear fields to monitor the immunity of buildings and equipment. It also greatly reduces the risks of sudden accidents and has many other uses. Like mosquitoes, they are sensitive to waves from 40 kilohertz to 50 kilohertz.