LRF1221C 12km 1535nm Eye-Safe Long-Range Laser Rangefinder Module for Border, Coastal and Mapping Systems

TECHNICAL SPECIFICATIONS

OUTLINE DIMENSION(mm)

107×62×72mm

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

LRF1221C 12km 1535nm Eye-Safe Long-Range Laser Rangefinder Module for Border, Coastal and Mapping Systems

The LRF1221C is a 1535nm Class I eye-safe long-range laser rangefinder module engineered as an OEM core for border surveillance, coastal observation, reconnaissance, surveying and mapping systems. With no outer housing and multiple electrical interfaces, it is designed to be embedded directly into handheld devices, multifunction sights, vehicle and shipborne turrets, and fixed electro-optical stations, supported by PC host software and embedded firmware for rapid integration.

Using a 1.54µm±0.02µm erbium-glass laser, a ≤0.3 mrad divergence angle and ≥300µJ single-pulse energy, together with a Φ12 mm launch lens and Φ40 mm receiver lens, the LRF1221C delivers ultra-long-range performance. Under 30% reflectance and visibility ≥15km, it reaches ≥12 km on a 4m×6m objective, with a minimum range of ≤50 m. Ranging accuracy is ±2 m, resolution ≤0.1 m, precision rate ≥98% and false alarm rate ≤1%, giving system designers reliable distance measurements for wide-area border lines, coastlines and high-vantage mapping platforms.

The ranging frequency is adjustable from 0.5 Hz to 10 Hz, enabling both low-duty-cycle monitoring and higher refresh rates for tracking. Time-of-flight processing with up to three reported targets per shot allows first/main/last-target logic in layered scenes such as harbor approaches, coastal cliffs, mixed vegetation and built-up areas. This makes the LRF1221C suitable not only for classic distance measurement, but also for long-range situation awareness and target cueing in EO/IR and thermal imaging systems.

Electrically, the module operates from a DC 12 V supply. Standby power consumption is ≤1.2 W, average power ≤2 W and peak power ≤3 W @10 Hz, offering an efficient balance between 12km-class performance and power budget in tower, vehicle and shipborne installations. A Molex 51021-0500 connector exposes a TTL (3.3 V) interface with RX, TX, CTRL (3.3–5 V power on, 0 V power off), +12 V and GND, while a J30J pin-in-lead package provides an RS-422 differential interface with RX+/RX− and TX+/TX− pairs and redundant supply pins. Integrators can therefore select TTL for compact internal wiring or RS-422 for long cable runs in noisy environments.

Communication uses a master–slave protocol at 115200 bps, with 8 data bits, one start bit, one stop bit and no parity. The frame structure consists of a 0x55 header (STX0), command word (CMD), length byte (LEN), parameter bytes (DATAH/DATAL) and an XOR checksum (CHK). Core commands include standby (stop continuous ranging), single ranging, continuous ranging with a programmable period in milliseconds, self-test, distance selection and minimum range (blind-zone) setting, cumulative shot-count query, APD power on/off and serial-number query. Response frames return self-test voltages and temperatures, blind-zone values, total shot counts and up to three target distances (0.1 m resolution) along with a status flag byte that reports main-wave and echo presence, laser status, timeout, APD status and whether fore and aft targets are present.

Mechanically, the LRF1221C measures 107 × 62 × 72 mm and weighs ≤275 g, using a pin-in-lead J30J package for rugged mounting. It is specified for an operating temperature range of −40 to +70 °C, storage from −55 to +75 °C, and meets MIL-STD-810G impact and vibration test standards, ensuring long-term reliability on border towers, coastal headlands, armored vehicles, patrol craft and other platforms exposed to harsh weather and mechanical shock.

For systems requiring a protective optical window—such as sealed coastal stations, radar/EO fusion masts or hardened border sensors—the optical window should use an anti-reflective coating optimized for 1525–1545 nm with ≥99% transmittance. After additional hydrophobic or hard coatings and mechanical assembly, overall transmittance should remain ≥97%. Window thickness is typically controlled within 2–4 mm, the emission axis should be aligned within 2–4° of the window normal, and the air gap kept as small as possible, while the effective aperture and outer diameter follow the recommended geometry to limit absorption and back-reflection.

With its 12 km NATO-class range, eye-safe 1535nm wavelength, compact OEM form factor, selectable TTL/RS-422 interfaces and complete communication protocol, the LRF1221C is an excellent choice for border and coastal surveillance networks, long-range EO/IR and thermal imaging systems, reconnaissance and mapping payloads, fixed observation posts and industrial distance-measurement equipment that demand stable, long-range distance data and straightforward serial integration.