Detailed LDR25K1 Specifications
The technical material below is retained for this model only. Do not transfer a range, pulse, interface, mechanical or safety value from another 1064 nm product.
Technical Specifications
| Parameter | Specification |
|---|---|
| Wavelength | 1.064 ± 0.003 μm |
| Pulse Energy | ≥ 25 mJ |
| Measurement Range (Ranging) | 120 m to ≥ 5,200 m (Vehicle-sized target) |
| Measurement Range (Designation) | ≥ 2 km |
| Ranging Accuracy | ±2 m |
| Ranging Frequency | 1 Hz / 5 Hz / Single-shot |
| Designation Frequency | 20 Hz (Coded) |
| Beam Divergence | ≤ 0.6 mrad |
| Hit Rate | ≥ 98% |
| Communication Interface | RS-422 / TTL |
| Supply Voltage | 20–28 V |
| Power Consumption | ≤ 50 W (Avg) |
| Operating Temperature | -40°C to +60°C |
| Dimensions | 68 mm × 52 mm × 90 mm |
| Weight | ≤ 380 g |
OUTLINE DIMENSION
≤ 68 mm × 52 mm × 90 mm
PIN INTERFACE
Communication interface: one TTL-level serial port.
Connector model and interface definition: see Table 1.
Socket: MOLEX 53048-0810
Mating Plug: MOLEX 51021-0800
Table 1 — Electrical Interface Definition (TTL)
|
Pin No. |
Signal Name |
Description |
|
1 |
24V |
Power supply + |
|
2 |
24V |
Power supply + |
|
3 |
24V GND |
Power return (–) |
|
4 |
24V GND |
Power return (–) |
|
5 |
— |
— |
|
6 |
TTL_RX |
Host → laser rangefinder/designator module |
|
7 |
TTL_TX |
Laser rangefinder/designator module → host |
|
8 |
TTL_GND |
Serial port ground |
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 LDR25K1 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.
The controlled LDR25K1 PDF describes coded laser designation and laser ranging for target illumination of terminally guided weapons. It separately lists target laser designation for air-to-ground guided weapons.
This context is bound only to the controlled LDR25K1 document; end-system suitability and acceptance remain subject to engineering review.
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 1064 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 LDR25K1 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.