Ultrasonic sensors – find manufacturers and suppliers

Ultrasonic sensors are non-contact measuring and detection systems that use sound waves above the range of human hearing to measure distances, detect objects, monitor fill levels and determine positions without contact.

They are among the most robust sensor technologies in the industry, as they work independently of light conditions, color or transparency of objects. Due to these properties, ultrasonic sensors are used in automation, logistics, vehicle technology, medical technology and many other areas.

Below you will find the functionality and types of ultrasonic sensors, their use and areas of application as well as their advantages, limitations and restrictions that should be considered:

How ultrasonic sensors work:

Ultrasonic sensors work according to the echo principle.
A transducer in the sensor emits short ultrasonic pulses that propagate as sound waves through the air or another medium.
When these waves hit an object, they are reflected and received again by the sensor.
The sensor measures the time between transmitting and receiving the signal. The distance to the object is calculated from this transit time, taking into account the speed of sound.

Central functional aspects are:

1. Sound generation:
   Piezoelectric transducers generate high-frequency sound pulses, typically in the range of 20 kHz to several hundred kilohertz.
2. Sound propagation:
   The sound waves propagate in a cone shape. The opening angle influences the detection range and detection reliability.
3. Echo reception:
   The reflected signal is received and evaluated by the sensor. The strength and quality of the echo depend on the shape, size and material of the object.
4. Signal processing:
   Electronic circuits filter interfering signals, compensate for environmental influences and calculate precise measured values.

Types of ultrasonic sensors:

1. Distance sensors:
   These sensors provide continuous measured values over the distance between the sensor and the object.
   Typical applications include level measurement, positioning and height control.
2. Proximity and presence sensors:
   They switch when a defined distance is reached.
   Areas of application include object detection, collision avoidance and counting tasks.
3. Through-beam and reflection ultrasonic sensors:
   With reflection sensors, the echo from the object itself is evaluated.
   Through-beam systems work with separate transmitter and receiver and are suitable for greater distances.
4. Ultrasonic fork sensors:
   Transmitter and receiver are arranged in a U-shaped housing.
   They are suitable for precise detection of small objects or thin materials.
5. Area sensors:
   Multiple sound lobes generate a wide detection area.
   Ideal for presence monitoring or volume detection.
6. Media and liquid sensors:
   Specially designed for liquids, powders or bulk materials.
   They work without contact and are insensitive to foam or turbidity.

Use and application areas of ultrasonic sensors:

1. Industrial automation:
Distance measurement and position detection, collision protection for machines and robots, object detection regardless of color and transparency.

2. Logistics and conveyor technology:
Package and pallet detection, height and volume measurement, congestion and gap monitoring.

3. Process and process engineering:
Level measurement in tanks and silos, detection of liquids and bulk materials.

4. Vehicle technology:
Parking aids, distance warning systems, obstacle detection.

5. Medical technology:
Liquid monitoring, proximity detection in devices.

6. Building and environmental technology:
Presence detection, automatic door and light controls.

Advantages of ultrasonic sensors:

• Independent of color and transparency: even transparent, dark or highly reflective objects are reliably detected.
• Insensitive to light conditions: Function in darkness, sunlight or changing light conditions.
• Non-contact measurement: No mechanical wear, long service life.
• Suitable for harsh environments: Dust, fog or steam only slightly affect the function.
• Versatile application possibilities: Suitable for solid objects, liquids and bulk solids.
• Simple integration: Standardized interfaces and compact designs.

Limitations and restrictions of ultrasonic sensors:

Ultrasonic sensors also have system-related limitations.

• Limited resolution compared to laser sensors
• Dependence on air temperature and air flow
• Difficulties with very small, angled or sound-absorbing objects

These factors should be taken into account when making a selection.

Ultrasonic sensors are robust, versatile and reliable sensor components for non-contact measurement and detection tasks. Their mode of operation is based on the proven echo principle, which works independently of the optical properties of the objects. The wide range of sensor types enables use in numerous sectors and applications - from industrial automation and vehicle technology to process and building technology. Their advantages such as insensitivity to light, color and transparency as well as their suitability for harsh environments make ultrasonic sensors an indispensable technology in modern technical systems.

Here you will find an overview of the most important points to consider when purchasing ultrasonic sensors:

Ultrasonic sensors are indispensable in many industrial and technical applications, as they detect objects and media regardless of their optical properties. Their robustness against dust, darkness or transparent materials makes them particularly versatile. At the same time, ultrasonic systems react sensitively to certain environmental and application conditions. Professional purchasing therefore requires careful analysis of the application in order to ensure long-term measurement accuracy, reliability and cost-effectiveness.

• It all starts with an exact description of the task. Important questions are:
• Should an object be detected or should the distance be measured continuously?
• Is it a fill level, position, height or presence measurement?
• Are solid objects, liquids or bulk materials being detected?
• A precise application description prevents wrong decisions and unnecessarily complex solutions.
• Different ultrasonic sensors are used depending on the task:
• Distance sensors provide continuous measured values.
• Switching sensors react at defined distances.
• Fork sensors are suitable for small objects and precise switching points.
• One-way systems are useful for longer ranges or difficult reflections.
• Purchasers should check whether a standard device is sufficient or whether a special design is required.
• The measuring range must be suitable for the application and offer sufficient reserve. The following must be observed:
• Minimum and maximum measuring distance.
• Dead zones at close range in which no measurement is possible
• Stability of the measurement over the entire measuring range
• Sensors should not be operated permanently at their upper or lower measuring limit.
• The aperture angle determines how wide the detection range is.
• A large aperture angle facilitates object detection, but increases the risk of false reflections.
• A narrow aperture angle allows more precise measurements, but requires exact alignment.
• The geometry of the application must match the sound beam.
• Not every object reflects ultrasound equally well. The following must be taken into account:
• Size, shape and orientation of the object.
• Surface properties and sound absorption.
• Speed of movement.
• Very small, angled or sound-absorbing objects can make detection more difficult.
• The environment has a considerable influence on measurement accuracy. Important factors:
• Temperature, as it affects the speed of sound.
• Air currents that can distort the signal.
• Dust, vapor or fog.
• Moisture and aggressive media.
• Professional sensors have temperature compensation and robust housings.
• Accuracy, resolution and repeatability. Depending on the application, different performance characteristics are decisive:
• Measurement resolution for continuous distance measurement.
• Switching accuracy for presence detection.
• Repeat accuracy for stable processes.
• Higher accuracy often increases costs and requirements for mounting and alignment.
• Time plays an important role in fast applications. The following must be checked:
• Cycle time of the measurement.
• Delay between event and output signal.
• Suitability for fast conveyor or robot movements.
• Not every ultrasonic sensor is suitable for high-speed applications.
• The design of the sensor must match the system. Important aspects:
• Design and dimensions.
• Mounting type and alignment capability.
• Protection against mechanical damage.
• Stable and low-vibration mounting is crucial for reproducible measurements.
• The electrical connection must match the control unit. Please note:
• Digital or analog outputs.
• Signal types and voltage ranges.
• Parameterization and diagnostic options.
• Communication interfaces for modern systems.
• Good integration reduces commissioning time and sources of error.
• The cost of installation and operation is an important cost factor.
• User-friendly sensors reduce downtimes and training costs.
• Ultrasonic sensors are often in continuous operation. Important criteria:
• Quality of the transducer and electronics.
• Long-term stability of the measured values.
• Protection class and material quality.
• Manufacturer experience and support.
• Reliable sensors reduce operating costs in the long term.
• Depending on the area of application, legal requirements must be observed:
• CE conformity.
• Compliance with relevant standards.
• Safety requirements for personal protection applications.
• These aspects are particularly important in regulated industries.
• In addition to the purchase price, other factors also play a role:
• Installation and commissioning costs.
• Maintenance and replacement costs.
• Failure risks and follow-up costs.
• A high-quality sensor is often more economical in the long term than a low-cost solution.

The professional purchase of ultrasonic sensors requires a holistic view of the application, environment, technology and cost-effectiveness. It is crucial that the measuring range, sound beam, object characteristics and environmental conditions are carefully matched to each other. Systematic consideration of these factors will result in reliable, durable and precise sensor systems that enable stable processes and minimize downtimes. A well-founded selection pays off in the long term through high availability, low maintenance costs and reliable measurement results.

Ultrasonic sensors can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Ultrasonic sensors from all over the world can be found on Exportpages.