Ultrasonic Sensors: Working Principle, Types, Applications & Importance in Industrial Automation
Ultrasonic sensor working principle, ultrasonic sensor applications, industrial sensors, distance measurement sensor
Introduction:
Sensors, other words they are primary devices of modern automation and Control systems. Among all types of sensors, ultrasonic sensors are one of the most important contactless devices to measure distance, levels through ultrasonic waves.
In this article, we see about ultrasonic sensors, working principle, types, applications, benefits, and real-world uses in industrial automation.
What is Ultrasonic Sensor mean?
An ultrasonic sensor is an electronic device that uses high-frequency sound waves to detect or measure. By applying a generated high frequency ultrasonic wave through air and measure time taken to reach receiver with reflected wave is calculated to distance.
Distance = Speed X Time / 2
The sensor consist of two parts:
1. Ultrasonic frequency generator
2. Receiver of reflected wave
It works by sending ultrasonic sound waves ( above human hearing range 20KHz ) and receiving the reflected waves from objects. Based on the time taken for the echo to return. The distance or objects identified by using speed and time calculation with a microcontroller.
π Simple Example:
Just like how bats navigate using sound, ultrasonic sensors use sound waves to detect.
This is a sample image of ultrasonic sensor detects approximate range of 400 cm maximum.
What is Ultra Sound Frequency Waves?
Ultra sound refers to sound wave with frequencies higher than the Human hearing range, typically above 20,000Hz ( 20KHz ). The above image showed is HC-SR04 operating frequency of approximately 40KHz.
The image is for understand the sensor only. The frequency 40KHz is far beyond our hearing capability. These high frequency wave travel through the air and reflect back off objects, allowing us to measure distances.
Working Range Of HC-SR04 is limited from approximately 2cm to 450cm ( 4.5 meters )
Working Principle of Ultrasonic Sensors
Step-by-Step Working:
The sensor generates high-frequency sound waves (typically 20 kHz to several MHz) by frequency generator.
2. Sound Wave Transmission
Distance Calculation by formula
Types of Ultrasonic Sensors:
Ultrasonic sensors are available in different types based on application:
1. Doppler Type Ultrasonic Sensor
- These type detect moving objects by doppler effect, which means when a object moves inside( Towards Transmission Location ), the frequency of reflected is increased due to upward shift (Doppler Effect) or moving outside ( Way of Frequency Traveling ) will reduce the reflected frequency due to down ward shift.
- The formula of Doppler shift is:
2. f0 = Transmitted Frequency of ultrasonic waves in Hz
3. v = Moving object's Velocity
4. c = Speed of sound in air
- Doppler sensors , highly sensitive, capable of detecting small movements of objects.
- Doppler effects made these sensors to measurement of accuracy of velocity.
- These sensors used to speed monitoring in Robotics, Traffic Controls and Industrial automation and control sectors.
2. Transceiver Ultrasonic Sensor
In a transceiver, the transmitting unit converts electrical signals into high-frequency ultrasonic waves (typically above 20kHz) and emits them to air. The ultrasonic waves propagate through the air at speed (approximately 340 meters per second) and reflect back when encountering an object in its path. The receiver gets the reflected waves. By measuring the time between emitted and received, the distance to the object is calculated using “Time of Flight” (ToF) method.
The formula to calculate the distance is:
Distance = (Time X Speed of Sound) / 2
Advantages:
- Combined transmitter and receiver into a single module makes the sensor compact and easy to install.
- Suitable for applications across industries like manufacturing, automotive and environmental monitoring.
3. Bistatic Ultrasonic Sensor:
- In Bistatic ultrasonic sensors transmitting and receiving units are located in different positions with a fixed at a specific angle relative to the object to measure.
The operating principle of a bistatic ultrasonic sensor is, the generated frequency wave is emitted through the emitter and reflected frequency wave received through the receiver,
- Because of the transmitter and receiver are separate, bistatic system designed to cover larger distances compared with monostatic sensors.
- Bistatic ultrasonic sensors are superior in performance and accuracy.
Applications of Ultrasonic Sensors
Ultrasonic sensors are widely used in industrial automation and daily life.
Level Measurement:
1. Water tanks
2. Oil storage tanks
3. Chemical industries
Automotive Industry:
Obstacle detection
Robotics:
1. Distance measurement
2. Navigation systems
3. Under sea depth detection
Benefits of Ultrasonic Sensors
Ultrasonic sensors offer many advantages compared to other sensors
1. No physical contact required
2. Dust, moisture, and dirt do not affect performance
2. Dust, moisture, and dirt do not affect performance
High Accuracy
1. Reliable distance measurement
2. Versatile Usage
3. Works with solid, liquid, and transparent objects
4. Low Maintenance
5. Long life with minimal maintenance
Ultrasonic sensors are used across many industries:
Manufacturing Industry:
Used for object detection.
Oil & Gas Industry:
Used for level measurement in tanks.
Automobile Industry:
Used in parking assistance.
Limitations of Ultrasonic Sensors
- Performance affected by temperature changes
- Soft materials may absorb sound waves
- Limited range compared to some sensors
- Cannot work in vacuum
Industrial Example
In water treatment plant and domestic applications ultrasonic sensors are used to monitor and maintain water levels in tanks.
And real time level data can be prompted using Ultrasonic sensors.
πRequest from writer to readers , I would like to know your valuable comments below to upgrade our style and quality of coming articles of technology.
Conclusion
Ultrasonic sensors are one of the most powerful and reliable tools in automation applications. Their ability to measure distance and detect objects without contact makes them highly valuable in many applications.
From manufacturing plants to smart vehicles, ultrasonic sensors are helping improve efficiency, safety, and performance.
π Want to learn more about industrial sensors and automation systems?
π Follow our blog for regular updates, practical guides, and real industrial insights!
π¬ Have questions? Drop them in the comments – we’re here to help!
About Kii Softtech
Kii Softtech is focused on providing knowledge, solutions, and insights in industrial automation, electrical systems, and smart technologies.
We aim to simplify complex engineering concepts into easy-to-understand content for students, technicians, and leaners.
Our Goal in Automation Products
At Kii Softtech, our goal is:
To educate people about automation technologies what we experienced.
To provide practical industrial knowledge what we gathered
To help businesses improve efficiency using smart systems what we learnt
To promote modern solutions like PLC, VFD, sensors, and IoT to industries
We believe in automation's future, and knowledge is the key to success.
Tags: Ultrasonic Sensor, Industrial Automation, Sensors, PLC Automation, Distance Measurement, Electrical Engineering, Smart Industry, Automation Technology,
Comments
Post a Comment
For Your Enquiries regarding PLC , HMI , VFD , Sensors , Servo Drives and Motors, for Support Kindly Mention Your Industry And Requirement Details . Thank You For Valuable Support.