Unitree L1 Pm Lidar (Precision Measurement) (LIDAR-L1-PM)

Ask a robot where the nearest wall is, and a camera can only offer an estimate drawn from shading and perspective; a laser returns a measured distance. The Unitree L1 Pm Lidar (Precision Measurement) (LIDAR-L1-PM) is built around that difference. It combines a measuring laser, a wide vertical sweep and a grayscale channel in a housing of 75×75×65mm that weighs 230g. For teams that need geometry they can rely on, on a platform with little room to spare, it turns the question of what surrounds the machine into numbers rather than guesses.

Robots Europa, based in Dublin, supplies the Unitree L1 Pm Lidar (Precision Measurement) to universities, research groups, system integrators and companies throughout the EU and the DACH region. Robots Europa prepares each quotation for the project in question, arranges delivery within its European territory and remains the point of contact for technical questions once the sensor has arrived.

Background

Unitree Robotics and the step into sensing

Unitree Robotics made its name with legged robots: quadrupeds first, and later humanoid platforms that are now familiar in research laboratories, teaching environments and inspection work. A robot that walks rather than rolls places particular demands on perception, because its body pitches and rolls with every step and the ground ahead is rarely flat. Building its own LiDAR was a logical extension for a manufacturer in that position, and the L1 is the result: a compact sensor intended to give mobile machines a dependable picture of their surroundings. The wider range of sensors offered through Robots Europa can be found in the Unitree Lidar category.

A measuring instrument in a small package

Unitree describes the L1 as a cost-effective, safe and reliable 4D LiDAR, delivering 3D position together with a 1D grayscale value for each point. The family is offered in two versions, named Precision Measurement (PM) and Remote Measurement (RM). This page covers the PM version, whose name sets out its priority: measurement fidelity at working distances, in a form small and light enough to mount on a robot head, a mast or a compact chassis. Its Class 1 eye-safety rating under IEC60825-1:2014 means that it can be operated in spaces shared with people, which matters in laboratories, lecture rooms and offices.

Technical Specifications

Specifications are as published by the manufacturer and are confirmed against the datasheet at quotation. The manufacturer has not published a payload compatibility list, details of the point cloud output format, the cable length or a shock and vibration rating; these points are confirmed at quotation.

What does "4D" mean on the Unitree L1 PM?

A conventional 3D LiDAR reports where each point lies in space. The L1 PM adds a fourth value to every point: a grayscale reading. In practice, this gives software a second way of telling surfaces apart. Two objects at the same distance and of similar shape, such as a painted wall and a poster fixed to it, produce almost identical geometry but can return different grayscale values. For mapping, localisation and object recognition, that extra channel provides texture where pure geometry is ambiguous.

Two rates appear in the specification, and both deserve attention. The sensor samples at 43200 points/s, while the effective frequency is 21600 points/s. The effective figure is the one against which to plan processing load and map density, because it describes the points that reach the application. Combined with a 360°* 90° field of view and a vertical scanning frequency of 180Hz, the L1 PM covers a broad dome rather than a single horizontal line, so obstacles below and above the mounting height are part of the picture rather than blind spots.

The TTL UART interface is a logic-level serial connection, common on embedded boards and microcontrollers. It suits designs in which the sensor connects directly to an onboard computer, and integrators should plan the corresponding wiring at the design stage.

Precision Measurement or Remote Measurement: which L1 is right?

The two versions are named for different priorities. The figures on this page belong to the PM version, which is oriented towards accurate measurement, with an accuracy of ±2.0cm. The Unitree L1 Rm Lidar (Remote Measurement) (LIDAR-L1-PM-RM) is the sibling to consider when an application is defined chiefly by distance rather than by fine detail. No figures for the RM version are given here, and none of the PM values above should be read as applying to it. Where the choice between the two is not obvious, Robots Europa sets out both versions side by side, so that the decision rests on the requirements of the project rather than on assumptions.

Who is the Unitree L1 Pm Lidar (Precision Measurement) for?

University and research laboratories form the most natural audience. A sensor of this size and weight can be fitted to student projects, legged prototypes and small wheeled platforms without redesigning the frame, and its Class 1 eye-safety rating makes supervision in teaching spaces straightforward.

System integrators building indoor mobile robots, whether for logistics, inspection or service tasks, will value the wide vertical field of view for detecting obstacles at floor level and overhead, together with the accuracy figure for docking, alignment and navigation in confined spaces.

Embedded developers working close to the hardware will find the TTL UART interface a direct route into their own boards. Buyers planning to mount the sensor on a specific robot should name the target platform in their enquiry, so that Robots Europa can advise on the mechanical and electrical integration.

Projects where reach matters more than fine measurement should compare the RM version described above. Buyers looking for sensor packages tailored to particular robots will find further options among the Accessories and in the Unitree Lidar range.

What is the Unitree L1 Pm Lidar (Precision Measurement) used for?

1. Indoor navigation: supplying mobile robots with measured distances for path planning around furniture, people and doorways.
2. Mapping and localisation: building maps of rooms, corridors and workshops, with grayscale values adding texture to the geometry.
3. Obstacle detection: watching a broad dome around the robot so that objects at floor level and overhead are not missed.
4. Teaching and research: giving students and researchers a real LiDAR data stream for coursework on perception and autonomy.
5. Prototype integration: adding perception to legged or wheeled prototypes in which space and weight are limited.
6. Close-range inspection: recording the geometry of equipment, shelving or installations where accurate measurement matters more than reach.

Pricing and Availability

Robots Europa supplies the Unitree L1 Pm Lidar (Precision Measurement) on the basis of a written quotation prepared for your project. Tell us the robot or platform you intend to use, the number of units and your delivery address within the EU or the DACH region, and we will prepare the offer accordingly. Delivery, customs and support are arranged together with the quotation. The quotation request form for the Unitree L1 Pm Lidar (Precision Measurement) is available on this page.

Frequently Asked Questions

Is the Unitree L1 PM safe to use around people?

Yes. The sensor carries a Class 1 eye-safety rating under IEC60825-1:2014, and it uses a laser wavelength of 905nm.

How does the sensor connect to my computer or controller?

The communication interface is TTL UART, a logic-level serial connection. Integrators should plan wiring to suit the board they intend to use.

How large and heavy is the sensor?

It measures 75×75×65mm and weighs 230g, which allows it to be mounted on compact platforms and prototypes.

What is the difference between sampling frequency and effective frequency?

The sensor samples at 43200 points/s, while the effective frequency is 21600 points/s. The effective figure is the appropriate basis for planning processing and map density.

What does the grayscale channel add?

Alongside its 3D position, each point carries a grayscale value. This helps software distinguish surfaces that share a similar shape and distance, which supports mapping and recognition.

Should I choose the PM or the RM version?

The PM version is oriented towards accurate measurement, with an accuracy of ±2.0cm, while the RM version is aimed at applications defined by distance. Robots Europa can help you compare both against your project.

Where can I buy the Unitree L1 Pm Lidar (Precision Measurement) and what does it cost?

You can buy it from Robots Europa, which supplies customers across the EU and the DACH region. The cost depends on quantity and project requirements, so please request a quotation on this page.

Summary

A camera interprets a scene; the Unitree L1 Pm Lidar (Precision Measurement) measures it. With 3D position and grayscale for every point, a 360°* 90° field of view, ±2.0cm accuracy and a Class 1 eye-safety rating, all in a 230g housing, it gives compact robots measured geometry where they would otherwise have to rely on estimates. Where reach rather than fine measurement is the priority, the RM version offers an alternative within the same family. For research groups, integrators and developers across Europe who want to replace an estimate with a measurement, this page is the starting point.