Distance Sensors for Accurate Light Detection

Did You Know?

Did you know that eye‑safe 1.5 µm lidar systems can accurately range objects over several kilometers while emitting pulses with peak powers in the kilowatt range, because the retina is far less sensitive in the near‑IR than at 905 nm? Many scanning lidars do not continuously sweep their field of view; instead they use discrete beam steering via MEMS mirrors or optical phased arrays, producing angular resolutions on the order of 0.05–0.2° that are often mistaken for continuous scanning. Time-of-flight ranging with a 1 ns timing uncertainty already limits single-shot distance precision to about 15 cm, so high-precision systems rely on averaging, waveform fitting, or FMCW techniques to reach millimeter-level accuracy.
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Frequently Asked Questions

Laser scanning and ranging refers to systems that use coherent laser light to interrogate a scene and derive spatial information such as distance, profile, or 3D geometry. Unlike passive imaging, which records ambient or reflected broadband light, these systems emit a controlled laser beam and measure its return time, phase, or frequency shift to obtain metric data such as range maps, point clouds, and surface contours.

Overview of Distance Sensors on FindLight

Distance Sensors in the Light Detection domain measure separation between a sensor and a target by analyzing reflected optical signals. On FindLight, you will find a focused selection of distance measurement modules and subsystems that use visible or infrared emitters together with photodiodes, APDs, or other receivers to determine range, often via time-of-flight or triangulation.

These Distance Sensors are suitable for integration into OEM equipment, laboratory setups, and industrial automation where non-contact ranging, alignment, or position feedback is required. Devices differ in operating wavelength, measurement range, accuracy, and interface options, allowing you to match sensor characteristics to your optical and mechanical constraints.

Typical Specifications and Use Cases

When evaluating Distance Sensors, core parameters include:

  • Measurement range: From a few millimeters or centimeters up to several meters or more, depending on optical power and receiver sensitivity.
  • Accuracy and resolution: Sub-millimeter to multi-millimeter accuracy; resolution often specified as a fraction of full-scale range.
  • Wavelength and emitter type: Commonly 650–905 nm or 1300–1550 nm diode or laser sources, selected based on target reflectivity and eye-safety requirements.
  • Update rate: From a few Hz to kHz-level sampling for dynamic positioning or feedback loops.
  • Beam characteristics: Spot size, divergence, and alignment tolerance, crucial for small targets or long distances.
  • Interfaces: Analog voltage/current output, digital interfaces (TTL, RS-232/485, Ethernet, fieldbus) for system integration.

Typical applications for these Distance Sensors include robotic positioning, conveyor and level monitoring, safety zones, optical alignment in test benches, and closed-loop motion control in precision stages.

Buyer Guidance for Distance Sensors

When sourcing Distance Sensors on FindLight, start by defining your required range, accuracy, and update rate, then verify emitter wavelength against target material and ambient light conditions. Compare beam geometry, power consumption, and mechanical form factor to ensure compatibility with your optomechanical design.

Use FindLight to review detailed datasheets, compare Distance Sensors from multiple vendors, and check interface and mounting options. You can request quotes or technical clarifications directly from suppliers without registration, streamlining your procurement and design validation workflow.