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SPD1200H2 905nm Micro Laser Rangefinder Module for Thermal Imagers, Night Vision and Civil UAV Payloads

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Product Model:SPD1200H2

The SPD1200H2 is a micro 905nm laser rangefinder module for thermal imagers, night vision devices and civil UAV payloads, providing 0.2–1200m ranging with maximum nighttime reach up to 1500m. It supports adaptive 2–15Hz UART-TTL output, runs from 3.3–5V, consumes about 0.45W average / ≤0.75W max, and fits into a Ø17 × 28.2mm, ≤6g package with IP67 lens-cavity protection.

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Senior Engineer, Yilin

Tel : +86 28 81076698

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ERDI Pre-Sales Notice & Customer Information

(Please Read Before Purchase or Inquiry) Thank you for your interest in ERDI TECH LTD. We are committed to providing customers worldwide with high-precision, high-reliability laser products and technical solutions. Before placing an order, please read the following information carefully to better understand our company, services, and purchasing policies.

  • About ERDI​

     ERDI is a professional manufacturer specializing in the research, development, and production of laser modules, laser measurement systems, and related optoelectronic components.
    We integrate design, R&D, production, and sales, with a focus on safety, innovation, and precision.

    Our products are widely used in:

    • Industrial measurement and alignment systems
    • Scientific research and educational applications
    • Optical instrumentation and laser testing
    • Consumer and OEM laser solutions

    ERDI operates certified facilities and maintains rigorous quality control to ensure that every product meets international standards.

  • Global Presence and Trade Reliability​

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    To help customers evaluate our products and performance, we offer sample orders for most product categories.

    • Standard samplesare typically delivered within one week after order confirmation.
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      Our logistics team will provide real-time tracking and documentation for every shipment.
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    We provide technical co-development, logo engraving, packaging customization, and batch production services to meet both small-scale and mass-production requirements.

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    We provide:

    • Comprehensive technical consultation and project evaluation
    • One-on-one on-site technical assistanceat the customer’s facility when required
    • Lifetime after-sales supportand technical maintenance guidance

    Each laser product is delivered with a full set of user documentation, including Laser Module Usage Precautions and Safety Guidelines.

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    ERDI implements strict multi-stage quality control throughout production:

    • Incoming material inspection
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    Except for man-made damage, we will replace any defective unit within one year free of charge and provide lifetime maintenance support thereafter.

    For more details, please refer to our After-Sales Service & Warranty Policy.

  • Important Safety Reminder

    Before using any ERDI laser product:

    • Carefully read and follow the Laser Module Usage Precautions.
    • Always use appropriate laser protective eyewear.
    • Operate only in controlled environmentsunder trained personnel supervision.
      Failure to observe safety instructions may result in injury or equipment damage.
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    ERDI upholds the values of safety, integrity, and precision. We sincerely welcome customers from all over the world to visit our facilities, discuss cooperation, and experience our advanced laser technologies firsthand. Your satisfaction and trust are our highest pursuit.

After-Sales Service & Warranty Policy

We strive to provide high-quality laser modules and excellent customer service. Please read the following terms carefully to understand your rights and our responsibilities.

  • Product Origin and Quality Assurance​

    • All ERDI products are manufactured directly by the factory, ensuring consistent quality and full traceability.
    • We provide a diverse rangeof laser modules and laser distance measurement modules to suit various industrial, educational, and research applications.
    • Every product is tested and inspectedbefore shipment to guarantee that it meets specification standards.
  • Return and Exchange Policy​

    • Customers may request a return or exchange within 30 daysof receiving the goods, provided that:
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    • Upon approval, we will replace or refund according to our service policy.
    • The buyer is responsible for shipping costsassociated with returns, exchanges, or repairs, based on international freight cost rules.
  • Warranty Coverage​

    • The main functional componentsof ERDI laser products are covered by a 2-year warranty from the date of purchase, excluding cosmetic appearance.
    • Within the first 12 months, if a verified manufacturing defect occurs, we will replace the item with a brand-new productfree of charge.
    • Replacement of cosmetic or housing components (e.g., enclosure, labeling, or exterior parts) may incur a reasonable cost feebased on material expenses.
    • Warranty does not cover:
    • Damage due to misuse, improper installation, or modification.
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    • Accidental or physical damage, including drops, fire, or liquid ingress.
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    • Upon delivery, please inspect the parcel immediately in the presence of the courier.
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    • Once the package is signed for (by you, family, or colleagues), it is considered accepted as correct and complete.
  • Customer Support

    For technical assistance, warranty claims, or safety inquiries, please contact our official service team through the contact information listed on erdicn.com.
    Our support engineers will provide professional guidance on installation, alignment, safety, and maintenance procedures.

Laser Module Usage Precautions

(Important – Buyers Must Read Before Use)

Operating laser modules involves potential optical and thermal hazards. To ensure safe and proper use, please read the following precautions carefully before powering on your laser product.

  • General Safety Warnings​

    • Invisible Radiation Warning– Some laser modules emit infrared (IR) or ultraviolet (UV) radiation that is invisible to the human eye. Never assume the laser is malfunctioning simply because you cannot see the beam. Always confirm that the power is disconnected before inspecting the module.
    • Do Not Look Directly into the Laser Aperture– Even when wearing certified laser safety goggles, never stare directly into or near the beam exit of a working laser module.
    • Avoid Reflected Beams from High-Power Lasers– Reflection from Class IV lasers (output power > 500 mW) can cause severe and permanent eye damage. Always wear wavelength-specific safety goggles when operating or aligning high-power laser systems.
    • Keep Away from Flammable Materials– Do not place flammable or explosive items (such as paper, cloth, leather, or plastics) in the laser path. Black or dark-colored materials absorb laser energy more easily and may ignite. (Exception: controlled material-burning experiments with proper fire protection.)
    • Avoid Direct Human Exposure– Class IIIa or higher lasers (≥ 5 mW) can burn skin or eyes. Never point a laser beam at any part of a person’s body.
    • Restrict Access to Trained Personnel Only – Keep all laser devices out of reach of untrained individuals, children, and pets.
  • Optical Path and Reflection Safety​

    • Never Aim Toward Glass Surfaces– Ordinary glass reflects roughly 4 % of incident light, which can redirect dangerous laser radiation into your eyes. Avoid operating lasers in front of mirrors or reflective windows.
    • Working Plane Awareness– When setting up an experimental platform, note the laser emission height. Do not position your head or eyes near this level during operation. Lenses and mirrors may reflect or refract light unexpectedly. Always align optical components downward or horizontally—never angle a beam upward.
    • Remove Reflective Accessories– Watches, jewelry, and other shiny objects can reflect laser light unpredictably. Remove them before use.
    • Infrared Beam Detection– IR lasers (wavelength > 800 nm) are almost completely invisible. Use a beam-viewing card, IR detector, or up-conversion screen to visualize the beam path safely.
    • Visual Brightness Misjudgment– Some wavelengths (below 430 nm or above 700 nm) appear much dimmer than their actual power output. Do not rely on visual brightness to judge beam intensity.
    • Pulsed Laser Caution– Pulsed lasers can have extremely high peak power even at modest average power levels. Verify that all optical elements and samples in your experiment exceed the laser’s damage threshold before exposure.
    • Prohibited Uses– It is strictly forbidden to point laser beams at moving vehicles, aircraft, or any area where light could distract or endanger others.
    • End-of-Beam Safety Stop– Always place a black anodized or matte metal plate at the end of your optical path to absorb residual energy and prevent laser leakage into surrounding areas.

    Low-Power Modules – ERDI laser modules rated below 1 mW are considered eye-safe under normal operating conditions and can be used without hazard when handled properly.

  • Recommended Protective Measures​

    • Protective Eyewear– Always wear certified laser safety goggles designed for the specific wavelength and power level of your module.
    • Appropriate Clothing– Light-colored or white long-sleeved clothing reduces the risk of heat absorption or ignition if stray laser light contacts the fabric.
    • UV Laser Protection– For ultraviolet lasers, apply broad-spectrum sunscreen (SPF 30 or higher) to exposed skin areas to minimize UV radiation effects.
    • Environmental Safety– Operate lasers in a controlled laboratory or industrial environment with minimal reflective surfaces. Ensure that all personnel nearby are informed of ongoing laser use and have received proper training.

Technical Specifications

No.

Parameter

Specification

1

Laser Wavelength

905 nm ± 5 nm

2

Laser Beam Divergence

< 6 mrad

3

Optical Material

PMMA

4

Receiving Aperture

5.0mm × 7mm

5

Measurement Range

0.2 m – 1200 m
Maximum 1500 m (nighttime)

Note: The measurement range may be reduced under strong sunlight or low-visibility conditions.

6

Ranging Accuracy

±0.3m (≤100m)

±0.3m+d*0.7‰ (100m<d<1200m)

7

Measurement Frequency

2 Hz – 15 Hz Adaptive

8

Measurement Accuracy Rate

≥ 98%

9

False Alarm Rate

≤ 1%

10

Communication Interface

UART-TTL (Customizable)

11

Baud Rate

Default 115200 bps

12

Supply Voltage

3.3 V – 5 V

13

Startup Time

≤ 200 ms

14

Operating Power Consumption

Average Power Consumption ≈ 0.45 W

Maximum Power Consumption ≤ 0.75 W

15

Operating Temperature

-20°C to +60°C

16

Storage Temperature

-30°C to +70°C

17

Protection Rating

IP67 (Inside Lens Cavity)

18

Laser Safety Class

IEC Class I

19

Dimensions

Ø17 mm × 28.2 mm (Square Housing)

20

Weight

≤ 6 g

21

Shock Resistance

1000 g/ms (10 times/s along optical axis)

22

Vibration Resistance

5–50–5 Hz, 1 octave/min, 2.5 g

23

Reliability

MTBF ≥ 1500 h

Functional Description

The system supports single measurement and continuous measurement functions.

3.1 External Circuit Enable
Enables the module for normal operation.

3.2 External Circuit Disable
Disables the external circuit to reduce power consumption.

3.3 Single Measurement
Triggers a single distance measurement to the target. For low-reflectivity targets, the system automatically repeats measurements until stable distance data is obtained. The result is then transmitted via the serial interface in the standard data format.

3.4 Continuous Measurement
In continuous measurement mode, the laser module performs repeated distance measurements on the target. The typical refresh rate can be set to 2 Hz, and the maximum refresh rate can reach 15 Hz.

Electrical Interface Definition

Pin

Definition

Description

1

SW-SHOT

Function Enable (active high)

Note: Compatible with active-low control requirements

2

RXD

Signal input port, Host → Ranging Module

3

TXD

Signal output port, Ranging Module → Host

4

I/O (Reserved)

Reserved for expansion

5

VCC

Power +

6

GND

Power −

Mechanical Interface

SPD1200H2

Product Description

The SPD1200H2 is a compact 905nm laser rangefinder module developed for OEM integration in thermal imagers, night vision devices, telescopes, laser illuminators and lightweight civil UAV payloads. It is positioned as a civil-use electro-optical ranging core, focused on very small size, low power consumption and simple UART-TTL integration rather than heavy long-range military architecture.

The module operates at 905nm ±5nm and supports a measuring range of 0.2m to 1200m, with a maximum nighttime range up to 1500m. The specification notes that performance may be reduced under strong sunlight, backlighting or low-visibility conditions, which is standard behaviour for compact 905nm rangefinders working in real outdoor scenes. Ranging accuracy is ±0.3m up to 100m, and ±0.3m + d×0.7‰ from 100m to 1200m, where d is the measured distance. The valid measurement rate is ≥98%, the false alarm rate is ≤1%, laser beam divergence is <6mrad, and the receiving aperture is 5.0mm × 7mm

A practical strength of the SPD1200H2 is its adaptive 2–15Hz ranging frequency. The module supports both single measurement and continuous measurement. In single-shot mode, for low-reflectivity targets, the system automatically repeats internal measurements until stable distance data is obtained, then returns the result in the standard serial format. In continuous mode, the typical refresh rate can be set to 2Hz, while the maximum can reach 15Hz, which makes it well suited to handheld observation devices and embedded EO modules that need more flexibility than a fixed low-rate sensor. 

Electrically, the SPD1200H2 uses a UART-TTL communication interface with a default baud rate of 115200bps, and it runs from 3.3V to 5V. Startup time is ≤200ms, average operating power is about 0.45W, and maximum operating power is ≤0.75W. That is a strong SWaP profile for battery-powered optics, smart field devices and small UAV payloads, especially given the module’s size and weight. Comparable 905nm modules on the market are also commonly positioned around handheld optics, thermal imaging and UAV payload integration, so this placement is not marketing fog—it matches how buyers actually search.

The communication format is simple and firmware-friendly. The sensor uses an 8-byte frame with 0x55 0xAA header bytes, a function code, four data bytes and checksum. Supported functions include single-shot ranging, continuous ranging, stop ranging, optional angle measurement for versions equipped with an angle sensor, power-on self-test, baud-rate configuration and LD constant-ON mode for development. Distance data is returned in hexadecimal as the actual value multiplied by 10, so the host can reconstruct the range with one decimal place. The manual also notes that baud-rate changes only take effect after reboot, and that LD constant-ON mode should not be left enabled for long periods.

Mechanically, the SPD1200H2 is tiny: Ø17mm × 28.2mm with a square housing and a mass of ≤6g. It uses a 6-pin interface including SW-SHOT, RXD, TXD, reserved I/O, VCC and GND. The enable logic is also slightly unusual in a useful way: the Enable pin must be pulled LOW (connected to GND) during operation, and the manual notes compatibility with active-low control requirements. That makes it easy to drop into compact host electronics without inventing ritual sacrifices to the GPIO gods. 

The environmental envelope is practical for civil outdoor equipment: −20°C to +60°C operating temperature, −30°C to +70°C storage, IP67 inside the lens cavity, 1000g/ms shock resistance along the optical axis, 5–50–5Hz, 2.5g vibration resistance, and MTBF ≥1500h. These values fit well with portable optics, embedded sensing heads and small observation payloads that need ruggedness without the mass penalty of heavy metal housings. 

For optical-window integration, the manual recommends H-K9L optical glass or fused silica, wedge-angle tolerance ≤3′, surface roughness around Ra 0.012, and an AR coating optimised for 855–955nm with transmittance ≥99.5%. After any hydrophobic or hard coatings, total transmittance should remain ≥98%. The guide also recommends keeping window thickness around 2–4mm, aligning the transmit optical axis parallel to the window normal, and keeping the air gap below 0.5mm to reduce extra loss and back-reflection. That kind of boring optical discipline is usually where the real-world range goes to live or die.

The usage notes also clarify the real-world limits. Reflectivity, target shape, incidence angle and weather all affect achievable range and response speed. Under the specified reference condition—a medium-reflectivity target such as a building wall, perpendicular incidence, clear weather and no direct sunlight—the module achieves its nominal performance. The manual further notes representative target behaviour: high-reflectivity targets such as highway traffic signs, medium-reflectivity building walls, and low-reflectivity targets such as trees or animals all produce different maximum ranges, while rain, fog, snow and haze reduce usable distance. For long-distance measurement, tripod mounting is recommended. 

Taken together, the SPD1200H2 is best understood as a micro 905nm rangefinder core for civil electro-optical integration: tiny enough for handheld and embedded devices, strong enough for 1200m-class daytime and 1500m-class nighttime performance, and simple enough for quick UART-based secondary development in thermal imaging, night vision, portable optics, civil UAV payloads and outdoor observation systems

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