Detailed LRF0609C 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
|
Parameter |
Specification |
|
Operating wavelength |
1535 nm ± 10 nm |
|
Eye safety |
Class Ⅰ |
|
Applicable standards |
MIL-STD-810G |
|
Transmitting aperture |
Φ12 mm |
|
Receiving aperture |
Φ26 mm |
|
Maximum range |
Under visibility ≥ 12 km and relative humidity ≤ 60%, tested against a 0.3-reflectivity panel (or equivalent target): |
|
Minimum range |
≤ 20 m |
|
Range accuracy |
≤ ±2 m |
|
Ranging rate |
Single shot, 1 Hz, 2 Hz, 3 Hz, 4 Hz, 5 Hz, 10 Hz |
|
Beam divergence |
≤ 0.5 mrad |
|
Operating temperature |
−40 °C to +60 °C |
|
Storage temperature |
−50 °C to +70 °C (to be qualified at the system level) |
|
Vibration |
5→50→5 Hz sweep, 1 octave/min, 2.5 g (system-level qualification) |
|
Shock |
1200 g, 1 ms (system-level qualification) |
|
Overall dimensions |
55 × 48 × 32 mm |
|
Weight |
≤ 62 g |
|
Communication interface |
TTL |
|
Supply voltage |
4.5 V–16 V |
|
Power consumption |
≤ 1.5 W (avg), ≤ 0.3 W (standby) |
Structural dimensions
Overall dimensions:
≤ 55 mm × 48 mm × 32 mm
Figure — Mechanical and Opto-Mechanical Interface Diagram
Electrical Interface
a) Supply voltage: 4.5 V–16 V
b) Standby power consumption: ≤ 0.3 W; average power consumption: ≤ 1.5 W
c) The host computer connects to the rangefinder via a 6-pin connector for interface and testing. The pin assignment of the rangefinder’s power and communication port is shown in Table 1.
Table 1 — Pin assignment of the rangefinder power and communication port
|
Pin # |
Pin No. |
Remarks |
|
P-1 |
VIN+ |
Power input, 4.5–16 V |
|
P-2 |
VIN- |
Power ground (GND) |
|
P-3 |
POWER_ON |
Module power enable (TTL, 3.3 V logic level); |
|
P-4 |
UART_TX |
UART TXD (serial transmit), TTL, 3.3 V logic level |
|
P-5 |
UART_RX |
UART RXD (serial receive), TTL, 3.3 V logic level |
|
P-6 |
GND |
Serial ground (SGND) |
Connector Pin 1 Location
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 LRF0609C 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.
Applications
-
UAV and drone distance measurement
-
Autonomous navigation and obstacle detection
-
Military and defense rangefinding systems
-
Vehicle safety and collision avoidance
-
Surveying, mapping, and environmental monitoring
-
Industrial automation and robotics
Product Description
LRF0609C 6km 1535nm Eye-Safe Laser Rangefinder Module for UAV, Vehicle EO/IR and Security Cameras
The LRF0609C is a compact 1535nm eye-safe laser rangefinder module designed as a drop-in ranging core for UAV payloads, vehicle EO/IR turrets, PTZ security domes and industrial sensing heads. It emits 1535nm ±10nm laser pulses and calculates distance using time-of-flight, while communicating with the host system over a TTL UART interface with a simple, field-proven command set.
Under visibility ≥12km and relative humidity ≤60%, with a 0.3-reflectivity vehicle target (2.3m × 4.6m), the LRF0609C delivers a maximum range of ≥6000m, with a minimum range of ≤20m, ±2m range accuracy, ≥98% valid hit rate and ≤0.5mrad beam divergence. These parameters allow the module to support mid- to long-range surveillance, situational awareness and targeting tasks in traffic enforcement, perimeter monitoring and mobile platforms.
The ranging rate supports single-shot, 1Hz, 2Hz, 3Hz, 4Hz, 5Hz and 10Hz modes, selectable via commands. First-target and last-target ranging, together with configurable range-gate distances, enable engineers to handle cluttered scenes—such as vehicles in front of buildings, fences in front of background terrain, or multiple layers of traffic—by ignoring near-field clutter or far-field background according to system needs. The module also supports built-in self-test, status and temperature readout, shot counters and in-field firmware updates via the serial port, which simplifies maintenance and integration into long-life systems.
Electrically, the LRF0609C accepts a 4.5–16V supply, with standby power consumption ≤0.3W and average operating power ≤1.5W, making it attractive for battery-powered UAV gimbals, mobile surveillance systems and compact vehicle turrets that must stay within tight power budgets. A 6-pin connector exposes VIN+, VIN−, POWER_ON, UART_TX, UART_RX and signal ground, all at TTL 3.3V logic levels. The UART supports baud rates of 115200bps (default), 57600bps, 38400bps and 9600bps, using an 8N1 format with LSB-first transmission.
Mechanically, the module fits in a ≤55mm × 48mm × 32mm housing and weighs ≤62g, which is suitable for mid-size gimbals, PTZ housings and mast- or pole-mounted security cameras where volume and weight are constrained but 6km vehicle performance is required. Environmental robustness is ensured with an operating temperature range of −40°C to +60°C, storage down to −50°C and up to +70°C, plus 5–50–5Hz / 2.5g vibration and 1200g, 1ms shock at the system level, aligned with MIL-STD-810G-style conditions.
The LRF0609C uses a flexible communication protocol set. In “Protocol 1”, simple 0x55/0xAA framed commands support single and continuous ranging, baud-rate switching, range-gate configuration, self-test and status query, with routine response frames returning first/last distances, status bytes and 24-bit shot counters. For more advanced integration, “Protocol 2” uses an 0xEE 0x16 header and an explicit device code and length field, with command codes for self-test, single/continuous ranging, first/last/multi-target mode selection, frequency and gate settings, and total / per-power-on shot queries—allowing engineers to embed detailed health and configuration control directly in their host software.
For outdoor systems requiring a protective window, ERDI recommends an H-K9L optical glass window with high surface quality (Ra ≤0.012µm) and a wedge angle tolerance ≤3′. An AR coating optimised for 1525–1545nm should reach ≥99% transmittance, and even after additional hydrophobic or hard coatings and mechanical integration, overall transmittance should remain ≥97%. The effective aperture, outer diameter and spacing between the window and the LRF0609C antenna must follow the geometry guidelines to keep absorption and back-reflection low, while the laser axis should be held within 2–4° of the window normal and the air gap kept as small as practical.
In real projects, a 6km 1535nm eye-safe module like the LRF0609C fits naturally into UAV surveillance payloads, vehicle EO/IR turrets, border and perimeter cameras, traffic enforcement systems, robotic perception heads and industrial monitoring nodes, where accurate mid- to long-range distance data, Class I eye-safety, low power and a clear integration interface are all mandatory.
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 LRF0609C 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.