Pin Type Waterproof Proximity Sensor 40khz Ultrasonic Transducer
For Car Parking
Mean Time To Failure
Ultrasonic sensor is designed by ultrasonic
characteristics.Ultrasonic is a kind of mechanical wave which
vibration frequency is higher than the sound wave. It has high
frequency and short wavelength, especially the good direction,
Which can transmit to the specified direction and
location.Ultrasonic sensors can used in gas, Liquid and solid.
Ultrasonic has the big ability to penetrate liquid and
solid.Especially in the sunshine opaque solid, it can penetrate
tens meters depth.
Ultrasonic sensors are widely used in car parking assistance,
proximity alarms,Medical ultrasounds, and distance measurement.
How does it work?
The Ultrasonic Sensor sends out a high-frequency sound pulse and
then times how long it takes for the echo of the sound to reflect
back. The sensor has 2 openings on its front. One opening transmits
ultrasonic waves, (like a tiny speaker), the other receives them,
(like a tiny microphone).
The speed of sound is approximately 341 meters (1100 feet) per
second in air. The ultrasonic sensor uses this information along
with the time difference between sending and receiving the sound
pulse to determine the distance to an object. It uses the following
How to calculate the time?
Time = the time between when an ultrasonic wave is transmitted and
when it is received.You divide this number by 2 because the sound
wave has to travel to the object and back.
Why/When to use Ultrasonic Sensors ?
1. Ideally suited to accurate, automatic distance measurement in
normal and difficult environments
2. Particularly suitable for environments where optical sensors are
unusable such as smoke, dust and similar.
3. Very accurate, stable and can be used over large ranges.
Ultrasonic sensors can measure the following parameters without
contacting the medium to be measured:
Ultrasonic sensors make accurate measurements in many difficult
environments and unusual materials. Measurements are unaffected by:
Mist and Vapor