laser displacement meter

Laser meters have a clear advantage when you need to cover longer distances without physical contact. LVDTs and draw-wire sensors are fine for sub-meter ranges, but in a tunnel, you might need to measure across a 10-meter span. Lasers also avoid the mechanical wear that affects draw-wire systems over time. On the other hand, if the target surface is very shiny or transparent, a laser may need a reflector—something to consider during site selection.

A dark surface can reduce the sensor's range because less light reflects back. On uneven surfaces, the laser spot averages the distance over the illuminated area, which is generally fine if you're monitoring slow deformation. In these cases, we often suggest adding a small reflective target or painting a light-colored stripe to improve signal return. Our technical team can help you assess the surface before you buy.

Standard outputs are 4-20 mA current loop and RS485 with Modbus RTU. We can also supply SDI-12 for environmental monitoring networks. Protocol documents are supplied with every sensor, and we can email you a copy in advance for system integration planning. If your logger uses a different protocol, let us know—custom firmware is sometimes possible for volume orders.

For qualified projects, we do offer a loan unit for a 30-day trial. It’s a fully calibrated sensor, not a demo version. Lead time for standard models is about 2-3 weeks. Custom cable lengths or output modifications might extend that to 4 weeks. We ship globally, and our logistics team will handle the customs paperwork.

Drift is minimal—typically less than 0.1 mm per year under normal conditions. We attribute this to the robust optical design and internal temperature compensation. There’s no practical field calibration procedure because it requires a traceable reference rail. We recommend returning the sensor to our lab every 2-3 years for recalibration, or we can provide a field check fixture if your site has a known reference distance. Each return includes a new certificate and a health report on the laser diode.