LMI Gocator 4000 Series Smart 3D Coaxial Line Confocal Sensors

Shadow-free 3D inspection on steep angles, deep grooves, mirror-like surfaces, and transparent materials. Coaxial line confocal is the only 3D measurement technology that captures up to plus-or-minus 85 degree slope angles with zero triangulation shadow - and the Gocator 4000 Series brings it to inline factory inspection.

The Gocator 4000 Series is LMI Technologies' family of smart 3D coaxial line confocal sensors, engineered specifically for the inspection challenges that defeat triangulation-based laser profilers: steep-angled features, deep grooves, BGA solder balls, polished and mirror-finished surfaces, transparent adhesives, and any target geometry where shadowing or specular reflection creates data gaps in conventional 3D scanning. The coaxial optical design eliminates the triangulation shadow that limits standard laser profilers, capturing usable 3D data at slope angles up to plus-or-minus 85 degrees - a capability no laser triangulation sensor can match. Four optical models cover semiconductor, consumer electronics, EV battery, and precision manufacturing applications. All four ship with GoPxL IIoT Vision Inspection Software onboard for browser-based configuration and integration.

What "Coaxial Line Confocal" Means and Why It Matters

Every other 3D laser sensor in the Gocator portfolio - the 2100, 2300, 2400, 2500, 2600, 2880, 6300 - uses laser triangulation. A laser line projects onto the target at one angle, a camera observes the line at a different angle, and the sensor calculates Z height from the geometric offset between the two. This works beautifully on flat or moderately angled surfaces, but it has a fundamental limitation: when a feature is too steep, too deep, or shadows the camera's view of the laser line, you get a data gap.

The Gocator 4000 Series uses a fundamentally different optical architecture - coaxial line confocal imaging. The illumination source and the camera detector share the same optical axis, looking straight down at the target through a precision-calibrated chromatic lens. Z height is measured not by triangulating an offset, but by detecting which wavelength of light is in focus at the target surface (each wavelength has a slightly different focal distance through the lens). Because there is no triangulation angle, there is no triangulation shadow:

Key Features

• 1920 data points per profile for high-resolution, shadow-free 3D measurement
• X resolution down to 1.9 microns for fine semiconductor and electronics features
• Z resolution down to 0.2 microns for sub-micron measurement accuracy
• Maximum slope angle up to plus-or-minus 85 degrees - the defining advantage of coaxial confocal optics
• Fields of view up to 5.0 mm across the family
• Scan rates up to 16 kHz+ at limited measurement range (with GoMax NX or PC acceleration)
• Scan rates up to 4 kHz+ at full measurement range
• Coaxial optical design - zero shadowing on simple or complex surface topologies
• Shiny and mirror-finish capable - polished metals, semiconductor wafers, gold-plated solder balls
• Transparent and translucent material capable - measures clear adhesives, glass coatings, plastic films
• 2D intensity image alongside 3D data for combined dimensional and visual inspection in one pass
• Ships with GoPxL IIoT Vision Inspection Software onboard - browser-based configuration, no installed clients
• On-sensor measurement tools for direct measurement without external processing
• Simple mounting and system integration with standard Gocator I/O connectivity
• Industrial protocol support - EtherNet/IP, PROFINET, Modbus, ASCII, native Gocator protocol
• Compatible with the GoMax Smart Vision Accelerator for high-speed inline operation and AI-based defect detection
• Compatible with the GoPxL Anomaly Detector for AI surface defect detection on confocal 3D data

Gocator 4000 Series Models

The 4000 Series consists of four models in two generations. The newer Gocator 4011 and 4021 feature an advanced optical design that delivers superior data quality, repeatability, and linearity on challenging targets like semiconductor BGAs - significantly outperforming both LMI's previous-generation 4010/4020 models and competing line confocal technologies. LMI explicitly recommends the 4011 and 4021 for the majority of applications. The original 4010 and 4020 remain available for niche cases requiring additional sensitivity (shorter exposure times for higher scan speeds) or increased detection angle on highly reflective targets.

Shared Specifications Across the 4000 Series

Detailed clearance distance, measurement range, weight, dimensions, and per-model specifications vary by Gocator 4000 model. Contact Automation Distribution at 1-888-600-3080 for the official datasheet for your selected model and application-specific recommendations on 4011 vs 4021 vs 4010 vs 4020 model selection.

Where the 4000 Series Outperforms Triangulation

How the 4000 Series Fits LMI's Line Confocal Portfolio

The Gocator 4000 Series is one of two line confocal sensor families in the Gocator portfolio. Each addresses a different inspection priority:

Both families share the line confocal principle and complement each other. For most semiconductor BGA, deep-groove, and steep-angle applications, the 4000 Series is the right choice. For multi-layered glass thickness, semiconductor wafer subsurface measurement, and tomography applications, the 5500 Series is the right choice.

Software, Integration, and Networking

• GoPxL IIoT Vision Inspection Software onboard - the 4000 Series ships with LMI's latest-generation browser-based vision platform. No additional software purchase required.
• Browser-based configuration GUI - set up the sensor, build measurement tools, and visualize real-time 3D data from any device with a web browser.
• On-sensor measurement tools - run gauging, geometric, and feature-extraction tools directly on the sensor without an external PC.
• Open-source SDK - integrate with custom applications, robots, and PLCs using C-based libraries supported across the Gocator portfolio.
• Industrial protocol support - EtherNet/IP, PROFINET, Modbus, ASCII, and native Gocator protocol for direct PLC integration.
• GoMax acceleration required for 16 kHz+ scan rates - high-speed inline operation requires GoMax NX, GoMax ORIN, or GoMax ORIN+ to handle the data throughput. PC acceleration is also supported.
• Compatible with the GoPxL Anomaly Detector for AI-based defect detection on confocal 3D data - particularly powerful on the cosmetic and surface defects common in semiconductor and consumer electronics applications.
• Free Gocator Emulator for offline development and validation in a virtual sensor environment.

Compatible Accessories

Round out your Gocator 4000 Series deployment with factory-correct hardware available through Automation Distribution: LMI Cordsets for power, I/O, and Ethernet; the GoMax Smart Vision Accelerator for high-speed scan rate operation and AI-based defect inference; and the GoPxL Anomaly Detector for AI surface defect detection. The 4000 Series pairs particularly well with the Gocator 6300 Series precision telecentric profilers for applications requiring both coaxial confocal coverage on shadowed features and high-resolution laser profile data on diffuse surfaces.

Frequently Asked Questions

What is the Gocator 4000 Series used for?

The Gocator 4000 Series is LMI Technologies' family of smart 3D coaxial line confocal sensors, used for inline inspection in semiconductor manufacturing (BGA inspection, wire bonding, wafer dicing), consumer electronics (deep groove measurement, transparent adhesive inspection, polished surfaces), EV battery cell stack inspection, and precision mechanical parts with mirror finishes or steep angles. The defining capability is shadow-free 3D scanning at slope angles up to plus or minus 85 degrees - a measurement that no triangulation-based laser sensor can achieve. View the Gocator 4000 Series at Automation Distribution.

What is the difference between coaxial line confocal and laser triangulation?

Laser triangulation projects a laser line at one angle and views it from a different angle through a camera, calculating Z height from the geometric offset. This works on flat or moderately angled surfaces but cannot measure features where one feature shadows another from the camera's view. Coaxial line confocal uses a single optical axis - illumination and detection both look straight down at the target through a chromatic lens. Z height is measured by detecting which wavelength of light is in focus at the target surface. Because there is no triangulation angle, there is no triangulation shadow - features at steep angles, deep grooves, and shiny surfaces that defeat triangulation are captured cleanly.

What does plus or minus 85 degree slope angle mean in practice?

Slope angle refers to the tilt of a feature surface relative to horizontal. Conventional laser triangulation sensors typically lose data when features tilt beyond 30 to 45 degrees because the camera can no longer see the laser line on the tilted surface. The Gocator 4000 Series can capture measurement data on surfaces tilted up to 85 degrees from horizontal - effectively near-vertical walls. In practice this means the 4000 Series can measure the sides of BGA solder balls, the walls of deep grooves, the sides of cutting scribe lines, and other near-vertical features that triangulation cannot capture.

Should I order the Gocator 4011 or the Gocator 4010?

For most applications, the Gocator 4011 is the recommended sensor. The 4011 features an advanced optical design that delivers superior data quality, repeatability, and linearity on challenging targets like semiconductor BGAs and wire bonding - significantly outperforming the original-generation 4010 and competing line confocal technologies. Choose the 4010 only when your application requires additional sensitivity (shorter exposure times for higher scan speeds) or increased detection angle on highly reflective targets where the 4011 cannot achieve required throughput. The same logic applies to 4021 vs 4020 in the larger working envelope. Contact Automation Distribution at 1-888-600-3080 for application-specific guidance.

What is the difference between the Gocator 4000 Series and the 5500 Series?

Both are line confocal sensor families but use different optical architectures. The Gocator 4000 Series uses a coaxial single-axis design optimized for shadow-free 3D topography and 2D intensity capture on the target surface. The Gocator 5500 Series uses a patented dual-axis design that simultaneously captures 3D topography, 3D tomography (sub-surface layer structure), and 2D intensity data. Choose the 4000 Series for surface inspection where slope angle and shadowing are the primary challenges. Choose the 5500 Series when multi-layered structures, transparent material thickness, or sub-surface defects are the inspection target.

Can the Gocator 4000 Series measure transparent materials?

Yes. The chromatic confocal principle measures Z height by detecting which wavelength is in focus, which works on transparent and translucent materials where conventional laser triangulation fails. This makes the 4000 Series capable of measuring transparent adhesive bead heights, glass coating thicknesses, plastic film layers, and other transparent surface features. For multi-layered transparent measurements with sub-surface detail, the Gocator 5500 Series is the dedicated solution.

Do I need a GoMax accelerator with the Gocator 4000?

For scan rates above the sensor's onboard processing capacity (up to 16 kHz+ at limited measurement range), yes - either a GoMax Smart Vision Accelerator or PC-based acceleration is required. For lower-speed applications running on the sensor's onboard processor, GoMax is not strictly required. GoMax is also valuable if you intend to deploy the GoPxL Anomaly Detector for AI-based defect detection on the confocal data. Contact Automation Distribution for sizing recommendations based on your specific cycle time and data volume requirements.

Does the Gocator 4000 Series ship with software included?

Yes. The Gocator 4000 Series ships with GoPxL IIoT Vision Inspection Software onboard - LMI's latest-generation browser-based vision platform. No additional software purchase is required for basic operation. GoPxL provides setup, measurement tool building, real-time 3D visualization, and onboard measurement tools through any standard web browser. For AI-based defect detection capabilities, the optional GoPxL Anomaly Detector licensed dongle adds deep-learning defect identification on top of GoPxL.

Can I network multiple Gocator 4000 sensors together?

Yes. The 4000 Series supports standard Gocator multi-sensor networking through LMI Master controllers for synchronized power, laser safety, encoder input, and external trigger distribution across multiple sensors. Multi-sensor configurations enable parallel inspection of multiple parts on the same line or comprehensive coverage of complex multi-feature targets where one sensor's FOV is insufficient.