What is an Ultra sonic sensors?

Answer 1

A Ultra sonic sensor is like a very small speaker (usally of the piezoelectric type) which is able to sense Ultra sonic frequencys, these frequencys are above the normal hearing range of human hearing, in the range of bats and cats and dogs tho,

in some car alarms a sonic transmitter and sensor is used to detect a intruder or if the windows have been smashed, this uses two sonic devices (speakers) one as a transmitter and one as the receiver, the transmitter gives out sonic pulses which are received by the sensor, the electronics process the signal being received by the sensor which will be slightly diffrent than the transmitted signal due to materials in the car absosorbing and reflecting the sonic pulses, however if a window is broken or sombody enters the car the sonic pulses being received by the sensor will change again due to the new object in the car changing the absorbton or reflecton of the pulses this then leads to the alarm been activated

ultra sonic sensors and receives are used for may other things to like mapping the seabed or lakeb

A Ultra sonic sensor is like a very small speaker (usally of the piezoelectric type) which is able to sense Ultra sonic frequencys, these frequencys are above the normal hearing range of human hearing, in the range of bats and cats and dogs tho,

in some car alarms a sonic transmitter and sensor is used to detect a intruder or if the windows have been smashed, this uses two sonic devices (speakers) one as a transmitter and one as the receiver, the transmitter gives out sonic pulses which are received by the sensor, the electronics process the signal being received by the sensor which will be slightly diffrent than the transmitted signal due to materials in the car absosorbing and reflecting the sonic pulses, however if a window is broken or sombody enters the car the sonic pulses being received by the sensor will change again due to the new object in the car changing the absorbton or reflecton of the pulses this then leads to the alarm been activated

ultra sonic sensors and receives are used for may other things to like mapping the seabed or lakebeds, thay can tell you how deep a lake is by calculating the time it takes for the sent signal to be received by the sensor, also diffrent materials absorb the signal in diffrent ways so a good idear can be made of what the material is made of, also due to the high frequency of sonic waves it can be used to clean things by vibrating the dirt of them, eg sonic toothbrushs, cleaning dentist equipment etc

anyway i hope this answered your question!