TECHNICAL SPECIFICATIONS
|
Laser Wavelength |
1535±5nm |
|
Eye- safety |
Class Ⅰ (IEC 60825-1) |
|
Divergence Angle |
≤0.6 mrad |
|
Laser Energy |
≥100 μJ |
|
Field of View (FOV) |
~ 7. 4mrad |
|
Maximum Measuring Range (Visibility > 8km) |
≥ 4000m @60% Reflectivity, Building Target ≥3000m @30% Reflectivity, 2.3×2.3m Target ≥1500m @30% Reflectivity, 0.5×1.7m Target ≥800m @30% Reflectivity, 0.2×0.3m Target |
|
Minimum Range |
≤10 m |
|
Ranging Frequency |
1Hz ~3Hz |
|
Multi-Target Detection |
Up to 3 targets |
|
Ranging Accuracy |
±1 m |
|
Accuracy Rate |
≥98% |
|
False Alarm Rate |
≤1% |
|
Interface Type |
UART(TTL 3.3V) |
|
Power Supply Voltage |
DC 3~5V |
|
Standby Power Consumption (Full Temperature Range) |
≤10mW (Power on pulled low) |
|
|
≤0.8W (Power on pulled high) |
|
Operating Power Consumption (Full Temperature Range) |
5V.≤0.9W@1Hz |
|
|
5V,<1. 1W@3Hz |
|
Peak Power Consumption |
≤3W |
|
Start-up Time |
≤350ms (After startup, response time ≤20ms) |
|
Weight |
≤ 14士1g |
|
Dimensions |
≤ 27×25×15.5mm(L×W×H) |
|
Shock |
1200g， 1ms |
|
Vibration |
5~50~5 Hz, 1 octave/min, 2.5g |
|
Operating Temperature |
-40 ~ +70℃ |
|
Storage Temperature |
-45 ~ +70℃ |
|
Reliability |
MTBF>1500h |
OUTLINE DIMENSION(mm)
Recommended mounting bracket dimensions are as follows:
Installation Diagram:
PIN INTERFACE
|
Pin |
Definition |
Description |
|
1 |
POWER_ON |
Module Power Switch, TTL 3.3V Level; Module On (>2.7V), Module Off (<0.3V) |
|
2 |
UART_RX |
Serial Port Receiver, TTL 3.3V Level |
|
3 |
UART_TX |
Serial Port Transmitter, TTL 3.3V Level |
|
4 |
NC |
|
|
5 |
Power Positive |
Power Supply, 3~5V |
|
6 |
GND |
Serial Port Ground |
Product Description
LRF0306C 1535nm Mini Eye-Safe Laser Rangefinder Module for Drones, Robots and Smart EO/IR Sensors
The LRF0306C is a 1535nm eye-safe laser rangefinder module engineered for embedded integration in drone gimbals, mobile robots, compact EO/IR cameras and industrial sensing nodes. It uses a Class I 1535±5nm erbium-glass laser and time-of-flight (TOF) measurement to deliver precise distance data while meeting IEC 60825-1 eye-safety requirements, making it suitable for manned and unmanned systems operating in complex environments.
With a typical pulse energy of ≥100µJ, divergence ≤0.6mrad and a field of view around 7.4mrad, the LRF0306C covers a 10–4000m measurement range. Under visibility >8km, it achieves ≥4000m on 60% reflectivity building targets, ≥3000m on NATO 2.3×2.3m targets at 30% reflectivity, ≥1500m on human-size targets and ≥800m on 0.2×0.3m small objects, while maintaining ±1m ranging accuracy, ≥98% hit rate and ≤1% false alarm rate. Up to three targets can be reported in a single ranging cycle, supporting first, last and multi-target logic for cluttered scenes such as urban corridors, tree lines or industrial sites.
The ranging frequency is optimized for stable, low-power operation at 1–3Hz, ideal for platforms that focus on high-confidence navigation and mapping rather than very high frame rates. Both single-shot and continuous-ranging modes are available, and frequency can be configured through the UART command set, together with minimum and maximum gate distances that help reject near-field clutter or far-field noise.
Electrically, the LRF0306C operates from a DC 3–5V supply and exposes a UART (TTL 3.3V) interface through a compact 6-pin connector (FWF08002-S06B13W5M). Standby power is ≤10mW when POWER_ON is low; with POWER_ON pulled high, standby consumption is ≤0.8W, and typical operating power is about 0.9W at 1Hz and <1.1W at 3Hz, with peak power ≤3W. Startup time is ≤350ms and response time after startup is ≤20ms, allowing the module to be powered down between measurement bursts in aggressive power-management strategies on battery-operated drones or robots.
The mechanical design is ultra-compact—≤27×25×15.5mm, ≤14g—so it can be embedded directly into small gimbals, pan-tilt units, inspection cameras or robot heads without significant redesign. The module is qualified for −40 to +70°C operating temperature and −45 to +70°C storage, with 1200g shock and 5–50–5Hz, 2.5g vibration, matching the environmental demands of UAVs, ground robots and unattended outdoor sensors.
Communication uses a simple, robust UART protocol: after power-up, the host pulls POWER_ON high, waits ~0.3s for internal capacitors to charge and then issues commands for self-test, single or continuous ranging, stop ranging, baud-rate configuration, ranging frequency, gate-distance settings, first/last/multi-target mode and version/SN queries. Distance data are returned as a 3-byte value with 0.1m resolution, and status bits indicate whether the result is single, front, back or over-range, as well as which target index is being reported in multi-target mode.
To protect the optics in harsh environments, ERDI recommends using an external optical window with AR coating optimized for 1525–1545nm and ≥99% transmittance; after additional protective coatings (hydrophobic or hard coatings) and mechanical integration, overall transmittance should remain ≥97%. The effective aperture, outer diameter and gap between the window and the rangefinder need to follow the datasheet geometry guidelines to minimize loss and back-reflection, which is important for outdoor UAV, vehicle and mast-mounted applications exposed to dust, rain, fog and icing.
In real-world deployments, 1535nm eye-safe modules like the LRF0306C are widely used not only for rangefinding but also for drone navigation and obstacle avoidance, robotic perception, mobile mapping, industrial machine vision and perimeter security, where accurate distance information, low power and a compact footprint are critical. The 1.5µm wavelength is invisible to standard image intensifiers, offers low atmospheric attenuation and remains eye-safe under IEC Class I limits, enabling deployment in both defense and civilian systems that must meet strict safety and regulatory requirements.