Product Introduction

The ELRF-H25 laser ranging module is a self-developed, 1535 nm erbium-glass laser-based unit that uses single-pulse time-of-flight (TOF) technology. It integrates the laser source, transmit/receive optics and control electronics in one compact housing. Communication with the host is via RS422 (TTL optional); a PC test program and full protocol are supplied for rapid secondary development. The design offers ultra-small size, low weight, stable performance, high-shock resistance and Class 1 eye-safe operation, making it ideal for hand-held, vehicle-mounted and gimbal applications.

Product Functions

• Single-shot and continuous ranging
• Multi-target ranging (up to 3 targets)
• Range gating
• First/last target indication
• Built-in self-test on power-up

Applications

Hand-held laser rangefinders, vehicle-mounted ranging systems, UAV gimbals and other electro-optical payloads.

Specifications

Interface Description

• Communication interface: RS422, baud rate 115 200 bps (default)
• Electrical interface: connector A1002WR-S-10P

Operating Precautions

• The module emits 1535 nm laser radiation that is Class-1 eye-safe. Nevertheless, deliberate direct eye exposure should be avoided.
• Always cover the receive lens while aligning the three optical axes; excessive return energy can permanently destroy the detector.
• The module is NOT hermetically sealed. Operate only in clean environments with relative humidity < 80 % to prevent laser damage.
• Maximum range depends on atmospheric visibility and target reflectivity. Fog, rain, dust or sand reduce range. Highly reflective objects (green foliage, white walls, exposed limestone) increase range; large beam-to-target angles decrease it.
• NEVER fire the laser at highly reflective targets such as glass or white walls within 15 m; the intense return pulse can destroy the APD.
• NEVER connect or disconnect cables while the unit is powered.
• Observe correct power-supply polarity; reversal will cause permanent damage.