SL1 – Overview

Our sensors are named SL for subsea LiDAR.

The 3D at Depth SL1 sensor was designed to address the needs of the subsea construction, survey, and inspection industry in terms of range, accuracy, field of view, depth, and integration. The result is a system that integrates a unique optical design, a custom high sensitivity receiver, a sub-nanosecond pulsed high peak power solid state laser, high speed electronics, and patented processing methods to provide the accuracy and ranges required for subsea measurement tasks.

The SL1 has an embedded MEMS motion sensor to calibrate pitch and roll and create real world reference frames.  This overcomes the inability to “level” a subsea sensor.  The system also comes with an onboard computing subsystem and 750GB internal hard drive as well as a 64Gb internal solid state drive for fast performance and flexibility.

For real time data QC and data pre processing, the system includes a computer with 3D at Depth software for collection (3D Collect), viewing (QuickView) and the creation of LAS and 3DC files (3D Cloud).  3DC is a proprietary compression format which allows operators to move data across low bandwidth networks – from vessels to on shore processing teams.

Download a PDF version of the SL1 Data Sheet:  

SL1 Specifications (381.0 KB)

SL1 SL1 Integrated with an XLX ROV
 Tripod Configuration  ROV Mounted

Depth rating3000 meters
Diameter (OD)8.3 inches (210mm)
Length24.6 inches (624mm)
Operating Temperature34°C to -5°C
Weight in air90 lbs. (40.8 kg)
Weight in water34 lbs. (15.4 kg)
Laser classClass 1 (air) to Class 3B (Subsea)
Measurement MethodTime of Flight (ToF) PulsedPulse Repetition Rate 40kHz
Data sampling rate40 kHz
Field of View 30° x 30° (Azimuth and Elevation) x 330° pan - total field of view is 30° x 360°Programmable scan paths within the field of view
RangeMinimum: ~ 2m Maximum: ~ 45mDepends on water conditions and target reflectivity. Can be modeled for specific conditions.
Range precision±6mm @ 2-40m, 1σ
Per scan point to point accuracy±4mm, 1σ Single measurement at 20 meter range
Beam footprint@10m = 4.5mm, @20m = 8.6mm
Pan and Tilt encoder accuracy±0.05°
Spatial resolutionMaximum resolution of 1 mm between pointsPoint collected at every 0.01° in azimuth and elevation
3D Collect - Graphical User Interface (GUI)Point and click interface to control the sensor and capture and process datasetsScripting available for automated collection
Integrated pan/tilt controlIntegrated software control interface for a single z-axis pan rotation motor and encoder (SL1) and dual axis pan tilt (SL2)
Standard point cloud output formats.LAS, .e57 formatsLatest industry standard point cloud format
3D Cloud Point Cloud Processing toolmulti-return processor generates point clouds automaticallyclutter and SNR filters embedded
CommunicationsTCP/IPSL1 connects through a standard TCP/IP connection
Laser specificationClass 1 / Class IIIB Programmable safety settings
Peak power consumption110 Wattsnominal
Power supply24V DCoptional AC power unit available