Distance Sensors Modules | Jenoptik
Compact and easy-to-integrate optical distance measurement solutions for industrial automation suppliers
Optical Module Distance Detection
Optical modules detect distance by emitting light and measuring its reflection, using methods like time-of-flight, triangulation, or phase measurement to calculate precise distances.
Principles of Optical Distance Detection
Optical distance sensors measure the space between the sensor and a target without physical contact. The main methods include:
- Time-of-Flight (ToF): Measures the time a light pulse takes to travel to the target and back. Direct ToF (dToF) uses single-photon detectors for high accuracy and low power, while indirect ToF (iToF) measures phase shifts of modulated light signals . Frequency Modulated Continuous Wave (FMCW) is another variant for precise distance measurement .
- Triangulation: Uses the angle of reflected light on a sensor array to calculate distance, suitable for short-range, high-precision applications .
- Phase Measurement: Determines distance by analyzing the phase difference between emitted and reflected light, often used in medium-range sensors .
Sensor Module Architectures
Optical modules can vary in design depending on range and application:
- Single emitter with sensor array: Compact and suitable for consumer electronics.
- Emitter and sensor arrays: Enable faster multi-point measurements.
- Scanning mirror systems: Use a single source/detector to scan across a scene, ideal for 3D mapping .
Performance and Applications
- Range and Accuracy: Modules can measure from centimeters to kilometers, with millimeter-level accuracy in industrial systems . Short-range modules are compact and low-power, while long-range systems use larger optics and higher power sources .
- Speed: High-speed modules can operate at tens of kHz, enabling real-time monitoring of moving objects .
- Applications: Optical distance modules are used in industrial automation, robotics, transportation monitoring, object detection, fill-level measurement, and 3D mapping of environments like tunnels and road surfaces .
Advantages
- Non-contact measurement: Reduces wear and allows measurement of moving or hot objects.
- High precision: Laser-based modules can detect micron-level changes.
- Flexibility: Works across various materials and surface types, especially with infrared light to minimize ambient interference .
Considerations
- Optical power vs. aperture size: Larger apertures and higher power increase range but may require more space and energy .
- Ambient light interference: Infrared bandpass filters help reduce interference from sunlight or artificial lighting .
- Integration: Modules can be compact for multi-sensor systems or customized with interface boards for industrial automation . Optical module distance detection combines advanced light-based measurement techniques with flexible module designs, enabling precise, fast, and reliable distance sensing across a wide range of applications.
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