LRF1830C 18–23km 1535nm Eye-Safe TOF Laser Rangefinder Module for Coastal, Border and Long-Range EO/IR Integration

The LRF1830C is a 1535nm Class I eye-safe TOF laser rangefinder module operating at a wavelength of 1.54μm±0.02μm with a single-pulse energy of no less than 500μJ and a beam divergence angle of no more than 0.3mrad. It features a Φ18mm transmitting lens and a Φ60mm receiving lens. The module delivers a measurement range from 50m to 18000m, achieving no less than 18000m against a 3m×3m vehicle target under visibility of at least 26km and humidity no greater than 50%, and no less than 23000m against a 6m×6m diffuse target with reflectance of at least 30% under visibility of at least 30km. Ranging accuracy is ±2m with range resolution of no more than 0.1m, a hit rate of no less than 98%, and a false alarm rate of no more than 1%. The ranging frequency is adjustable from 0.5Hz to 10Hz, supporting simultaneous detection of up to three targets reported in near-to-far order.

 

The module employs a master-slave communication architecture with selectable TTL (3.3V, Molex 51021-0500 connector) or RS-422 (J30J military connector) interfaces, defaulting to 115200bps with 8 data bits, 1 start bit, 1 stop bit, and no parity. The communication frame format consists of a 55H header followed by a command byte, data length, parameters, and an XOR checksum. Supported commands include: standby (continuous ranging stop), single ranging, continuous ranging (period set in ms), self-test, nearest distance setting (blind zone in 1m units), cumulative emission count query, APD high voltage on/off, and unit number query. Ranging response data contains three target distances in 0.1m units along with a status flag byte indicating main pulse status, return pulse status, laser status, timeout alarm, APD status, and presence of fore-target and aft-target. The self-test response provides diagnostic information including APD temperature, APD high voltage value, blind zone value, and ±5V supply voltages.

 

The module operates on a DC 12V supply with standby power consumption no greater than 1.2W, average power consumption no greater than 2W, and peak power consumption no greater than 3W. Housed in a pin-in-lead package measuring 125mm×100mm×70mm and weighing no more than 400g, it operates across a temperature range from -40°C to +70°C with storage temperatures from -55°C to +75°C, and its impact and vibration resistance both comply with MIL-STD-810G military testing standards.

 

For optical integration, the window is recommended to be coated with an anti-reflective coating optimized for 1525nm to 1545nm with transmittance no less than 99%, with optional hydrophobic or hard coatings on the external surface depending on the application environment, achieving overall transmittance no less than 97%. The effective aperture of the optical window should exceed its outer diameter by at least 2mm, and the antenna outer diameter should exceed the projection of the effective aperture by at least 1.5mm. Window thickness should be controlled within 2 to 4mm, the angle between the emission optical axis and the window normal should be within 2° to 4°, and the air gap between the window and the rangefinder should be minimized.

 

With its extended range, high accuracy, multi-target detection capability, and eye-safe classification, the LRF1830C is ideally suited for coastal and border surveillance, long-range EO/IR systems, and strategic observation platforms.