UM18-11117 (6029508) | SICK Ultrasonic Sensor

Ultrasonic Sensors: A Fascinating Technology

Ultrasonic sensors represent a fascinating technology used in various industrial fields. These devices rely on the propagation of sound waves to measure distances, detect objects, or even estimate volumes. Kheeos Market offers a range of ultrasonic sensors.

How Do Ultrasonic Sensors Work?

Basic Principle of Ultrasonic Sensors

Ultrasonic sensors operate by emitting high-frequency sound wave pulses. When these waves reach an object or surface, they are reflected and return to the sensor. By measuring the time elapsed between wave emission and reception after reflection, the sensor can calculate the precise distance to an object. This process relies on the concept of time intervals and the speed of sound in the air.

Emission and Reception of Ultrasonic Pulses

An integrated transmitter within the sensor generates rapid vibrations at frequencies usually beyond 20 kHz, well above the threshold of human hearing. These ultrasonic waves propagate through the air until they encounter an obstacle and are then reflected back to a receiver. The receiver, often coupled with the transmitter, converts the received pressure variations into a digital signal interpretable by the microcontroller or main system of the device. Measurement accuracy directly depends on the fidelity of the emission-reception process.

Frequency and Interval Lengths

Ultrasonic sensors can use different frequencies for various applications. Higher frequencies provide fine resolution but shorter range, while lower frequencies cover longer distances with less precision. Measurement intervals play a central role in selecting a sensor based on the intended application. For example, a frequency around 40 kHz is commonly used in general industrial applications.

Applications of Ultrasonic Sensors

1. Automotive Industry

   • Ultrasonic sensors are ubiquitous in the automotive industry. They are primarily used in assisted parking systems, helping detect obstacles during reverse maneuvers. This technology enhances drivers’ perception of their immediate environment, reducing collision risks. Some manufacturers also use ultrasonic sensors to deploy airbags based on seat occupancy and position.

2. Aerospace Industry

   • In aerospace, ultrasonic sensors contribute to predictive maintenance and quality control. By inspecting parts for cracks or internal structural anomalies, these sensors ensure that each component adheres to the strictest safety standards. They are also used to monitor the thickness of composite materials on certain aircraft components, providing valuable data to extend critical element longevity.

3. Robotics and Industrial Automation

   • Ultrasonic sensors play a crucial role in object detection and obstacle avoidance for mobile robots in industrial environments. These sensors allow robots to map their real-time surroundings and adjust their trajectory to avoid interference. This significantly improves safety and operational efficiency in automated facilities.