nice explaination.. do you have an idea what kind of transducer do I need to make a protoype in my project? because i want to make a bird repeller that can deter birds using transducer
As a starting point you should ask, is it possible to determine a frequency range is likely to be a deterrent for the pests of concern, yet not going to cause distress to those people and creatures that are not the intended target? Critically, the upper limit of human hearing deteriorates with age so even if you cannot hear the signals generated, young children may be able to. Furthermore, other animals (domestic and wild) may have hearing ranges that extend well beyond human hearing. High frequency signals may cause substantial distress to dogs and bats; this latter case is especially important since bats may be protected species (they are in the UK). The second issue is that the transducers need to be specifically designed to operate in air. All of the Precision Acoustics transducers are designed to operate in fluids and solids so would not radiate well into air. In summary then, one needs to be particularly careful when designing your transducer to minimise collateral harm. Expert advise from an airborne ultrasonics expert familiar with the hearing ranges of a wide variety of species is probably required
