Detailed LRF0405C Specifications
The technical material below is retained for this model only. Do not transfer a range, pulse, interface, mechanical or safety value from another 1535 nm product.
Model-level data
Detailed LRF0405C Specifications
Values below are reorganized from the current ERDI marketing specification. Confirm the controlled datasheet revision, connector drawing and acceptance conditions with the quotation.
Basic Ranging Performance
| Model | LRF0405C |
|---|---|
| Specified minimum range | 15 m or less |
| 2.3 m x 2.3 m target range | 4,000 m or more at 30% reflectance and visibility of at least 5 km |
| 0.5 m x 1.7 m human-size target range | 1,200 m or more at 30% reflectance and visibility of at least 5 km |
| Ranging frequency | Single measurement or 1 to 10 Hz |
| Multi-target reporting | Up to 3 targets |
| Ranging accuracy | +/-2 m |
| Reported range resolution | 0.1 m or better |
| Valid measurement rate | 98% or higher under specified test conditions |
| False-alarm rate | 1% or lower under specified test conditions |
Optical Parameters
| Laser wavelength | 1535 +/- 5 nm |
|---|---|
| Laser-safety rating | Class I stated in the module specification; the finished integrated product requires its own safety assessment |
| Pulse energy | 200 microjoules or more |
| Beam divergence | 0.6 mrad or less |
| Transmitter lens diameter | 8 mm |
| Receiver lens diameter | 16 mm |
Electrical and Communication Interface
| Connector model | FWF08002-S06B13W5M |
|---|---|
| Communication interface | UART, 3.3 V TTL level |
| Marketing specification supply entry | DC 3 to 5 V |
| Interface-table supply entry | 4.5 to 16 V |
| Power-control input | POWER_ON; module on above 2.7 V and off below 0.3 V, as stated in the current interface table |
| Standby power | 1 mW or less |
| Average power | 2.5 W or less at 10 Hz |
| Peak power | 7 W or less; the current source references 12 V |
Five-Pin Interface
| Pin 1 | Positive power supply; red conductor |
|---|---|
| Pin 2 | Power ground; black conductor |
| Pin 3 | POWER_ON control; white conductor |
| Pin 4 | UART_TX, 3.3 V TTL; yellow conductor |
| Pin 5 | UART_RX, 3.3 V TTL; green conductor |
Mechanical and Environmental
| Dimensions (L x W x H) | 48 x 30.5 x 21 mm |
|---|---|
| Weight | Current marketing source states 32 +/-1 g maximum; confirm the controlled value |
| Operating temperature | -40 to +70 degrees C |
| Storage temperature | -55 to +75 degrees C |
| Impact resistance | Specified to meet MIL-STD-810G testing; confirm method, severity and acceptance criteria for the order |
| Vibration resistance | Specified to meet MIL-STD-810G testing; confirm method, severity and mounting condition for the order |
Engineering caution: The current marketing specification contains conflicting supply entries: DC 3 to 5 V in the main table, 4.5 to 16 V in the pin table, and a 12 V reference for peak power. Do not energize the module from this web page alone. Use the controlled interface drawing and written order configuration.
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
How it works
Pulsed Time-of-Flight Ranging
The LRF0405C emits a short 1535 nm optical pulse, collects reflected energy through its receiver aperture and measures the round-trip delay between transmission and an accepted echo.
Achievable field range depends on the complete optical link budget: pulse energy, beam divergence, target area and reflectance, atmospheric transmission, receiver aperture, optical-window loss, detector sensitivity and the signal-processing threshold.
Reporting up to three targets can help a host distinguish accepted return peaks from layered scenes such as foliage before terrain or a vehicle before a building. The host system must define which reported echo is operationally relevant.
Read range claims with their test conditions
- The 4 km figure is tied to a 2.3 m x 2.3 m target, 30% reflectance and visibility of at least 5 km.
- The human-size target figure uses a 0.5 m x 1.7 m target under the same stated reflectance and visibility conditions.
- Dark, oblique, small or partially obscured targets can reduce return-signal strength.
- Fog, rain, dust, heat shimmer and a contaminated optical window can reduce field performance.
- Acceptance testing should reproduce the target, atmosphere, repetition rate and host optics used in the real platform.
How this wavelength compares with common alternatives
| Wavelength family | Engineering strengths | Integration considerations |
|---|---|---|
| 1535/1550 nm | Well suited to eye-safety-oriented compact ranging architectures and compatible with InGaAs-class receivers. | Detector and optical-component cost can be higher than in silicon-based 905 nm systems. The finished product still requires a complete laser-safety assessment. |
| 905 nm | Broad silicon-detector ecosystem, compact components and cost-effective high-volume sensing. | Accessible-emission limits, detector dynamic range and solar-background rejection must be evaluated for the required range and final laser class. |
| 1064 nm | Common in high-energy ranging, designation and compatible electro-optical systems. | It is not an automatic substitute for a 1535 nm eye-safety-oriented module; detector choice, coatings, safety controls and mission architecture differ. |
Wavelength alone does not determine fog performance, field range or laser classification. Select a wavelength from the complete safety, target, atmosphere, detector, optical-window and cost trade space.
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.
No separate source-stated application section is available in this release. Confirm the use case, integration environment and acceptance method with ERDI engineering.
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
Technical FAQ
Questions System Integrators Ask
Does the 4 km specification apply to every target?
No. The stated 4 km figure is associated with a 2.3 m x 2.3 m target, 30% reflectance and visibility of at least 5 km. Smaller, darker, oblique or obscured targets and degraded weather can reduce achievable range.
Is the finished product automatically Class I after integration?
No. The current module specification states Class I, but the accessible emission of the finished product depends on the host window, control logic, service access and failure conditions. The final system requires its own safety assessment.
Which supply voltage should an integrator use?
Do not select a supply from the web page alone. The current source contains conflicting entries: DC 3 to 5 V, 4.5 to 16 V and a 12 V peak-power reference. Obtain the controlled interface drawing and written configuration before energizing the module.
Why can the module report up to three targets?
One transmitted pulse may produce several accepted return peaks from objects at different distances. Multiple reported targets let the host select the echo that matches its operating logic.
What should be included in a technical inquiry?
Provide target size and reflectance, required range, visibility assumptions, update rate, connector and cable requirements, supply limits, available volume and mass, operating temperature, host-window details and expected annual quantity.
Engineering references
- Burns, Christodoulou and Boreman, System Design of a Pulsed Laser Rangefinder, Optical Engineering, 1991
- Ma et al., The Short-Range, High-Accuracy Compact Pulsed Laser Ranging System, Sensors, 2022
- Duthon, Colomb and Bernardin, Light Transmission in Fog, Applied Sciences, 2019
- IEC 60825-1, Safety of laser products - Part 1
References provide general engineering context. Purchase specifications, interface documents and acceptance criteria are controlled by the ERDI document revision supplied with the order.
Product evidence and general technical context
The model PDF controls model claims. Public references below explain general engineering principles only.
Technical resources
Download LRF0405C Product Data
Use the current product information for early-stage comparison. Obtain the controlled datasheet, interface protocol and mechanical file before design release or purchase.
Controlled LRF0405C Datasheet
Request the current model specification and revision-controlled acceptance conditions.
Request Current PDFMechanical and Interface Package
Request the controlled outline drawing, connector definition and available 3D model.
Request Engineering Files- ERDI LRF0405C 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.
- Practical application of pulsed “eye-safe” microchip laser to laser rangefindersOpto-Electronics Review 21(3), 2013 - a peer-reviewed 1535 nm rangefinder implementation; use for general transmitter/receiver and atmospheric-design context, not model specifications.