Laser Twin Sensor measures from 0.20 to 0.79 in.

Press Release Summary:

Long Range Laser Twin Sensor tracks object displacement or running profiles at speeds up to 200 kHz. Thickness variations as fine as 0.007 µm can be resolved when averaged at 100 Hz. Unit automatically compensates for differences in object's color and surface, and can track smallest pits, surface textures, and sharp increases in object height. Sensor features laser spot size of 70 µm dia, observation angle of 25°, and stand-off of 1.18 in.

Original Press Release:

High Speed Laser Twin Sensor with Long Range Measurement and Resolution Introduced by LMI Technologies

Contact: Mike Snow
(770) 888-6586
For Immediate Release
July, 2003

DETROIT, Michigan --- A laser twin sensor with a long range measurement and long stand-off distance, combined with one of the fastest frequency rates in the industry, is now available from LMI Technologies (USA), Inc.

The Long Range Laser Twin Sensor (LTS) from LMI Technologies (USA) tracks object displacements or running profiles at extremely high speeds of up to 200 kHz. The long-range capability of the sensor allows users more maneuverability for fast moving, long-range measurements. Thickness variations as fine as 0.007 um can be resolved when averaged at 100 Hz, with accuracy measured in microns.

Other features of the Class IIIb Long Range Laser Twin Sensor are its laser spot size of 70 micrometers in diameter, observation angle of 25 degrees and stand-off of 1.18 in. (30mm). The LMI Technologies' sensor also has the ability to automatically compensate for differences in the object's color and surface, the ability to track the smallest pits, surface textures and sharp increases in object height, and the capability to measure both on frosted and furbished surfaces. The twin detectors also compensate for down spikes during changes of the object's color.

According to LMI Technologies, the longer range capability of the sensor gives it the flexibility to measure fast moving material that needs a larger measurement range with more measurement clearance.

Applications include measuring run out of shaft spring, thin tube material, surface roughness, measuring the thickness of thin coatings and numerous thickness measurement, high speed motor run out, applications in various industries and coordinating small parts, co-planarity of pins, measurement of spherical surfaces, rubber gear belt profiles, tape drive read head measurement and wire bonding tool check.

"The Long Range Laser Twin Sensor is a very economic and practical sensor for OEM applications of fast moving parts or material," noted Mike Snow, Regional Sales Manager for LMI Technologies (USA), Inc. "This makes it ideal for a multitude of industries ranging from electronics, metals and paper."

LMI Technologies' Long-Range LTS Sensor Described
The Long Range Laser Twin Sensor laser triangulation sensor emits a single laser beam that strike's the object surface, reflecting a spot through twin imaging optics onto two position sensitive detectors (PSD's). If the reflected spot on one PSD is obscured, the other PSD will see it. Using the two PSD's compensates for intensity variations within the laser spot and improves lateral sensitivity of the sensor as well. Analog signal processing electronics translate the PSD output currents into a distance.

Measuring Range of the LTS sensor is from 0.20 in. to 0.79 in. (5.0 to 20 mm), depending on the model selected, and accuracy is lower than 0.1 percent of the measuring range. Sensors operate in temperatures from 32°F to 120°F (0°C to 50°C). Weight of the sensor is 26.8 oz (750 grams).

LMI Technologies (USA), Inc., is part of LMI Technologies, Inc., a world leader of laser-based 3-D machine vision sensors for process monitoring and control in various industries. The company has more than 40 vision and laser sensor models and over 100 issued and pending patents.

For more information on the Long Range Laser Twin Sensor or any other of the company's laser triangulation sensors, contact LMI Technologies (USA), Inc., at 21455 Melrose Ave., Suite 22, Southfield, Ml 48075 or call (248) 359-2409, FAX (248) 355-3283 or E-Mail is LMI can be found on the Internet at

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