Knowledge
Six stages, from the physics to the field.
Written in the factory's own voice. Every specification quoted inside an article is the same figure published on the model's page — nothing here introduces a number that does not already exist in the catalogue.
- Articles
- 10
- Stages
- 6
- Author
- ERDI TECH
- Deep reference
- /docs
01
Principles and terminology
Direct time of flight, 905 nm silicon detection, pulse energy, beam divergence and valid measurement rate — the physics behind every number on our spec sheets.
How 905 nm DToF Laser Ranging Works
Inside the pulse-out, photon-back measurement loop that turns a 905 nm laser diode and an avalanche photodiode into a distance reading — and why the numbers on our spec sheets (frequency, valid measurement rate, false alarm rate) describe that loop, not just a laser.
4 min readRead →
Understanding Rangefinder Accuracy Specs: ±m vs %
Why every accuracy line on our spec sheets has two parts — a fixed near-range figure and a distance-proportional term — and how to read it correctly for the distance band your system actually operates in.
3 min readRead →
02
Architecture and design
How the transmit, receive, timing, firmware, power and thermal paths work together to set real-world range, weight and accuracy.
03
Requirements and selection
Turning target, range, accuracy, frequency, interface, SWaP and environment into a short list of the right module.
905 nm vs 1535 nm: Choosing the Right Wavelength
Two wavelengths dominate laser rangefinding for very different reasons — one because silicon detectors make it cheap and compact, the other because it clears the eye's focusing optics entirely. Here's how the trade-off actually works, and why this site is 905 nm only.
4 min readRead →
Introducing Our Short-Range DToF Sensor Line
Eight new 905 nm DToF sensors covering 0.05 m to 1,500 m — from a 1.5 g chip-scale sensor for drone altitude hold to a 20 g industrial LiDAR for kilometre-class crane and traffic-safety ranging. Here's how the line is organized and where each format fits.
4 min readRead →
04
OEM integration
Mechanical datums, optical windows, boresight, grounding, UART-TTL timing and host software for a clean first bring-up.
05
Manufacturing and verification
Incoming inspection, assembly, alignment, calibration, acceptance evidence and environmental screening before a unit ships.
06
Applications and lifecycle
Night vision, UAV, industrial and mapping use in the field — real deployments, maintenance and feedback.
Laser Rangefinders in Night Vision & Thermal Devices
Why a ranging module has to disappear into a night-vision or thermal housing rather than compete with it for weight and space — and how the SPD-mini and tube-series lines are built around exactly that constraint.
4 min readRead →
Drone Altimetry & Obstacle Sensing with Laser Modules
Altitude hold and forward obstacle ranging ask a laser module to do two different jobs. Here's how weight budget, adaptive frequency and — for gimbal payloads — an integrated gyroscope shape the module choice for each.
4 min readRead →
Short-Range Single-Point DToF Sensors for Industrial & Robotics
Not every ranging problem needs kilometres of reach. For AGVs, robot arms and fixed automation sensing, a small, low-power, single-point DToF module solves the problem a scanning LiDAR is overkill for.
4 min readRead →