Detailed LRF1525C 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
| Project | Performance Indicators |
| Model | LRF1525C |
| Laser Wavelength | 1.54μm±0.02μm |
| Eye- safety | Class Ⅰ |
| Divergence Angle | ≤0.3 mrad |
| Laser Energy | ≥500 μJ |
| Launch Lens Diameter | Φ15 mm |
| Receiver Lens Diameter | Φ50 mm |
| Measuring Range
（Reflectance 30%; visibility ≥ 18 km.） |
4m×6m Objective ≥15 km |
| Minimum Range | ≤50 m |
| Ranging Frequency | 0.5Hz ~10Hz |
| Communication interface | RS422 |
| Ranging Accuracy | ±2 m |
| Range Resolution | ≤0.1m |
| Precision Rate | ≥98% |
| False Alarm Rate | ≤1% |
| Pin-in-lead package model | J30J |
| Supply Voltage | DC12 V |
| Standby power consumption | ≤1.2W |
| Average power consumption | ≤2 W |
| Peak Power Consumption | ≤3W |
| Weight | ≤400g |
| Dimension (L×W×H) | 125mm×85mm×58.5mm |
| Operating Temperature | -40～+70 ℃ |
| Storage Temperature | -55～+75 ℃ |
| Impact Resistance | Meet the MIL-STD-810G testing standard |
| Vibration Resistance | Meet the MIL-STD-810G testing standard |
OUTLINE DIMENSION(mm)
125mm×85mm×58.5mm
PIN INTERFACE
Selectable between TTL (Molex 51021-0500) / RS-422 (J30J)
1 Electrical connector model: Molex51021-0500. The detailed definition of the electrical interface is as follows:
Table 1 Interface definition
|
External plug-in XS3 |
Model：Molex51021-0500 |
Remark |
|
1 |
TTL RX |
3.3V |
|
2 |
TTL TX |
3.3V |
|
3 |
CTRL |
3.3V-5V power on, 0V power off |
|
4 |
+12V |
Power supply+ |
|
5 |
GND |
Power supply- |
2. Electrical connector model: J30J; The corresponding plug and cable shall be provided by Party B. The detailed definition of the electrical interface is shown in the following table:
Interface Definition
|
Pin |
Definition |
Function |
Remarks |
|
1 |
GND |
Serial Port Ground |
|
|
2 |
GND |
12V Input Negative |
|
|
3 |
GND |
12V Input Negative |
|
|
4 |
VCC 5V |
12V Input Positive |
|
|
5 |
VCC 5V |
12V Input Positive |
|
|
6 |
RS422 RX+ |
Serial Port Receive + |
From the upper computer to the rangefinder |
|
7 |
RS422 RX- |
Serial Port Receive - |
From the upper computer to the rangefinder |
|
8 |
RS422 TX- |
Serial Port Transmit - |
From the rangefinder to the upper computer |
|
9 |
RS422 TX+ |
Serial Port Transmit + |
From the rangefinder to the upper computer |
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 LRF1525C 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
LRF1525C 15km 1535nm Eye-Safe Laser Rangefinder Module for Multi-Platform EO/IR and Optical platform Sight Systems
The LRF1525C is a 1535nm Class I eye-safe laser rangefinder module developed as a high-energy, long-range core for multi-platform EO/IR and Optical platform sight systems. It supports single-shot and continuous ranging, distance selection, front and rear target display, self-test and adjustable continuous ranging frequency from 0.5Hz to 10Hz, and is supplied with PC host software and embedded software to simplify integration into handheld devices, ground vehicles, airborne and naval turrets, and even space-oriented electro-optical payloads.
Using a 1.54µm±0.02µm erbium-glass laser with a divergence angle of ≤0.3mrad, single-pulse energy ≥500µJ, a Φ15mm launch lens and a Φ50mm receiver lens, the LRF1525C is optimized for long-range detection. Under 30% target reflectance and visibility ≥18km, it achieves a measuring range of ≥15km on a 4m×6m objective, with a minimum range of ≤50m. Ranging accuracy is ±2m, resolution ≤0.1m, precision rate ≥98% and false alarm rate ≤1%, giving system designers authoritative distance performance for vehicle navigation aids, mast-mounted EO/IR stations and coastal or wide-area reconnaissance sensors.
The module supports both single-shot and continuous ranging. In continuous mode, the host sets the ranging period in milliseconds over the serial interface, and the LRF1525C returns distance and status according to the programmed cycle. Up to three targets per shot are reported from near to far in both single and continuous ranging, with a flag byte describing main-wave and return-wave presence, laser status, timeout, APD status, and whether pre- and post-targets exist. This makes it possible to implement first/last target logic in complex scenes such as urban skylines, forest edges, coastal clutter or vehicle columns.
Electrically, the LRF1525C operates from a DC 12V supply. Standby power consumption is ≤1.2W, average power ≤2W and peak power ≤3W, providing a favorable balance between 15km-class performance and system power budgets. A pin-in-lead J30J package offers an RS-422 differential interface with RX+/RX− and TX+/TX− lines and multiple supply pins, suitable for long cable runs and noisy environments, while a Molex 51021-0500 connector exposes a TTL (3.3V) interface with RX, TX, CTRL (3.3–5V power-on, 0V power-off), +12V and GND for compact internal wiring. Communication format is master–slave, 115200bps, 8 data bits, one start bit, one stop bit and no parity.
Command frames start with 0x55 and include a command word, length byte, parameters and an XOR checksum. Core commands include standby (continuous ranging stop), single ranging, continuous ranging with programmable period, self-test, distance selection and minimum distance (blind-zone) setting, cumulative shot-count query, APD power on/off and serial-number query. Response frames provide self-test information such as APD temperature, APD high voltage and internal supply voltages, blind-zone values, total shot counts and up to three target distances with 0.1m resolution. Engineers can quickly diagnose system health and optimize algorithms for different targets and environments using these detailed status bytes.
Mechanically, the LRF1525C is packaged in a 125mm×85mm×58.5mm pin-in-lead module with a weight of ≤400g, giving a robust form factor for turret, mast, tripod or fixed-station mounting. It is specified for an operating temperature range of −40 to +70°C, storage from −55 to +75°C, and passes MIL-STD-810G impact and vibration tests, ensuring long-term reliability on vehicles, naval platforms, airborne systems and static observation posts exposed to harsh climatic and mechanical conditions.
For systems that require a protective optical window—such as sealed EO/IR heads, naval domes or border towers—the optical window should use an anti-reflective coating optimized for 1525–1545nm with ≥99% transmittance. After additional hydrophobic or hard coatings and mechanical integration, overall transmittance should remain ≥97%. The effective aperture, outer diameter and thickness (typically 2–4mm), the alignment of the emission axis within 2–4° of the window normal, and a minimized air gap all follow the recommended geometry to reduce absorption and back-reflection while protecting the optics in real-world environments.
As a result, the LRF1525C is a strong choice for multi-platform EO/IR and Optical platform sight systems, vehicle and naval turrets, coastal and border surveillance, long-range reconnaissance cameras, industrial distance-measurement equipment and any application that needs stable 15km-class, eye-safe distance data with a clean RS-422/TTL serial interface.
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 LRF1525C 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.