Datasheet

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S15E.pdf
08.10.31
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Applications
1. Examples of Applications
Ultrasonic sensors are utilized for many purposes such
as measurement applications etc.
For examples of these applications, please refer to the
examples in Table 2 and the explanations as follows.
Level detection of continuous wave signals (Example 1)
is used for counting machines and approximate switches
due to the simple circuit construction of these devices.
Example 2 is used in devices such as automatic doors
where the environment is very changeable. The system
is arranged so that the instrument may actuate only
when a certain number of reflected pulses is detected.
And example 2 is also used for measuring distance to an
object, such as the back up sensors of cars.
Example 3 is an application utilizing the phenomenon
by which the Doppler effect produces a modulated signal
as an object moves closer or farther away. This is often
used for intruder alarm systems.
Example 4 is an application utilizing the change of
sound velocity according to the density and the flow
speed of a gas.
Example 5 is a method used to count the number of
Karman vortex generated against flow speed and utilize
phenomena that ultrasonic signals level are reduced as
Karman vortex passes into the sensor.
Table 2 Application Examples
No. Function Method

S
: transmitter
Performance Principle
(

R
: receiver
)
Applications
1
Detection of Signal
level of continuous
wave
Counting instruments
Access switches
Parking meters
2
Measurement of pulse
reflection time
Automatic doors
Level gauges
Automatic change-overs of traffic
signals
Back sonars of automobiles
3
Utilization of Doppler
effect
Intruder alarm systems
4
Measurement of direct
propagation time
Densitometers
Flowmeters
5
Measurement of
Karman vortex
Flowmeters
S
R
Output Signal
Object
Input Signal
S
R
Output Signal
Input Signal
T
Object
S
R
Output Signal
Movement
Input Signal
Object
T
S R
Output Signal
Input Signal
S
R
Output Signal
Obstacle
Input Signal