Detailed LRF0306C Specifications
The technical material below is retained for this model only. Do not transfer a range, pulse, interface, mechanical or safety value from another 1535 nm product.
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 |
Model-specific conditions and limits
Conditions are retained only when the source states them. They are not reconstructed from a nominal range or wavelength.
Read the controlled model table for its stated target, reflectance, visibility, temperature, rate and acceptance conditions. No additional condition has been inferred for this model.
Pulsed Time-of-Flight Ranging
A pulsed rangefinder estimates one-way distance from the round-trip delay of an accepted optical return. The equation is general engineering context, not an additional LRF0306C specification.
Pulse energy describes emitted energy per pulse; its effect cannot be separated from pulse width, divergence, optical losses, receiver threshold and the stated target/atmosphere conditions. It is not a substitute for a model-specific near- or long-range acceptance test.
Source-stated application context
Application labels indicate evaluation context, not automatic fitness for a finished system.
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.
Confirm short- and long-distance acceptance conditions
- Define minimum distance, target material, reflectance, size and incidence angle.
- Check receiver recovery, optical-axis overlap and strong-return handling at the intended near limit.
- Verify supply tolerance, peak current, grounding, interface levels, connector and timing with the ordered revision.
- For long-distance acceptance, state target geometry, visibility, weather, background and required detection probability.
- Test with the installed window, boresight, field of view, enclosure and thermal path rather than a bare module alone.
- Evaluate accessible emission, labels and failure conditions again for the finished laser product under IEC 60825-1.
Questions to resolve before design release
Does a stated maximum range apply to every target?
No. A stated range must be read with its target and environmental conditions. Dark, small, oblique, wet or partially obscured targets and degraded visibility can reduce received signal.
Does 1535 nm itself establish the laser classification?
No. Classification concerns accessible emission from the finished laser product. The module statement and final instrument assessment are distinct.
Can a long-range claim be used as the minimum range?
No. Minimum-distance behaviour depends on the particular transmit/receive geometry, receiver timing and strong-return management documented for the model and host system.
Product evidence and general technical context
The model PDF controls model claims. Public references below explain general engineering principles only.
- ERDI LRF0306C model PDFModel-specific technical evidence.
- System Design of a Pulsed Laser RangefinderOptical Engineering 30(3), 1991 - link budget, background, noise, detection and range error.
- The Short-Range, High-Accuracy Compact Pulsed Laser Ranging SystemSensors 22(6), 2146, 2022 - pulsed-ToF equation, timing error, reflectivity and temperature effects.
- Laser system range calculations and the Lambert W functionApplied Optics 48(4), B1-B7, 2009 - range performance versus atmospheric transmission, target and system parameters, and threshold SNR; its 1.06 µm example is general context, not ERDI model data.
- Monostatic all-fiber rangefinder systemApplied Optics 54(25), 7687-7694, 2015 - a measured case study of shared-aperture geometry and receiver-recovery loss; it does not establish an ERDI model limit.
- Light Transmission in Fog: The Influence of Wavelength on the Extinction CoefficientApplied Sciences 9(14), 2843, 2019 - measured and modeled wavelength-dependent fog attenuation.
- IEC 60825-1:2014Laser-product classification and accessible-emission requirements; final equipment requires system-level assessment.
- Practical application of pulsed “eye-safe” microchip laser to laser rangefindersOpto-Electronics Review 21(3), 2013 - a peer-reviewed 1535 nm rangefinder implementation; use for general transmitter/receiver and atmospheric-design context, not model specifications.