120dB Ultrasonic Type Level Transmitter Unmanned Helicopter Sensor
|Transmitting Sound Pressure Level|
at 40.0KHz; 0dB re 0.0002µbar per 10Vrms at 30cm
|Receving Sensitivity at 40.KHz 0dB=1 volt/µbar||-61dB min.|
|Capacitance at 1KHz ± 20%||2400pF|
|Total Beam Angle -6dB||55° typical|
|Operation Temperature||-30 to 70 °C|
|Storage Temperature||-40 to 80 °C|
With the deepening of the ultrasonic ranging technology research
and ultrasonic dust proof, prevent mist, the unique advantages of
non contact, and also have a certain ability to adapt in the bad
environment, and the ultrasonic sensor has the advantages of simple
structure, small volume, reliable signal processing etc., the
application of ultrasonic distance measurement is becoming more and
more popular, ultrasonic ranging technology has been widely used in
machinery manufacturing, industrial control, electronics,
metallurgy, Marine, the universe, petrochemical industry, reverse,
Why to use sensors?
Over the last few years vehicle safety devices such as extra
mirrors or camera monitor systems with wider viewing angles have
become mandatory. However, despite an increase in all-round
visibility, collisions with other vehicles, fixed objects,
cyclists, workers and even pedestrians, remain high.
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