LRF1525C 15km 1535nm Eye-Safe Laser Rangefinder Module for Multi-Platform EO/IR and Optical Platforms

TECHNICAL SPECIFICATIONS

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

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

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.