Acuity’s AR1000 laser distance sensor uses continuous wave laser diodes, modulating the amplitude at high frequencies, to measure distances by measuring the phase shift of the returning light.
The AR1000 laser distance sensor can measure targets from 0.1 m (4 in) up to 30 m (100 ft) without the use of reflective targets. It can work with any opaque target, even glowing steel at temperatures up to 1000°C (1800°F). The AR1000’s accuracy is typically ± 3 mm (0.12 in), but this will depend on the reflectivity of the target surface, ambient light, and temperature conditions. Dark-colored targets may decrease the laser’s range and accuracy. In simple sampling modes, the AR1000 self-determines the optimal sampling speed, waiting until it collects enough light to make an accurate measurement. Typical sampling output rates are 6 Hz, but 50 Hz sampling is possible at close ranges to white targets. See the technical document download area for more information.
For very distant measurements, you can use retroreflective target material (such as 3M Scotchlite 3279) to increase the maximum measurement range to 150 meters (500 feet).
The AR1000 has a Class 2, red, visible laser diode for simple aiming and setup. The spot size is 5 mm as the light leaves the laser, and the beam has a divergence of 0.6 milliradians. Larger targets may be necessary at long distances.
Outputs and Inputs
You can choose a standard RS232 or optional RS422 serial interface for communication with a computer or PLC. The AR1000 also comes with a standard, 4-20 mA, analog, current loop output. The analog output can be programmed to have a custom measurement span, and the minimum and maximum currents can be set to any points in the laser’s range. The linearity of the analog output is +/- 0.15% of the span due to the digital to analog converter, so it’s important to set the analog measurement span accordingly if you need the maximum, 3mm accuracy.
The AR1000 has a single limit output for indicating alarms. This can be useful for triggering an external device when a target reaches a set position. The AR1000 also has a line in to receive an external trigger to take single distance measurements.
The AR1000 can also be purchased with an optional internal heater that allows operation in temperatures as cold as -40°C (-40°F). The heater can be configured to power on below a user determined temperature in the settings.
AR1000 Case Studies
ACUITY AR1000 TOUCH PANEL DISPLAY IN FRACTIONS
Acuity has had many customers request that the AR1000 long range laser sensor be able to provide a color Touch Panel Display that can output the measurement format in English unit fractions.
Foundation Pile Set Measurements
A maker of foundation pile testing equipment uses laser rangefinders to collect set data, acquiring it much faster than hammer impacts. The rangefinder is affixed to a stationary base. The automated equipment is set up prior to starting of the hammer and does not require the use of manual recording methods.
LASER-BASED DEPTH MEASURING FOR DRILL RIGS
A global manufacturer of self-contained drill rigs uses the AccuRange 1000 laser distance sensor to automatically gage the depth of drilled holes. Their drill rigs are equipped with powerful down-the-hole hammers for high-capacity rock drilling in quarries, opencast mines and construction projects. The operator, sitting in a climate-controlled cabin, can know the exact hole depth on a digital console display.
Length Measurement of Hot Steel Pipe
A system integrator in Croatia worked closely with a steel pipe manufacturer to develop a system for measuring the length during production. The clever solution incorporates an AR1000 laser distance sensor from Acuity to measure to the leading edge of the pipe during cutting.
Overhead Crane Position Measurement
Steel mills producing large coils of sheet stock store their inventory on the floors of huge warehouses. Modern factories automate the pick and place of their inventory in 3D space by equipping their overhead cranes with multiple laser distance sensors.
Sag of Web Material to Control Take-Up Speed
Before material is cut into individual sheets, there can be a large sag created by the mismatch of speeds between two rollers. A global manufacturer sought to use laser distance sensors to improve the performance of their production lines.
Steel Tank’s End-Cap Dimensions
A manufacturer in Brazil designs and builds tanks and vessels for use in various chemical and petrochemical industries.The company approached Acuity to assist in improving their dimensional measurement practices.
Wing Displacement Measurement Tests
The “wing up-bend test” is a test of the mechanical integrity of composite wings as they are displaced upwards. Hanging from the end of each wing is a laser distance sensor, mounted on a gimbal to ensure the laser would be pointed perpendicularly to the floor as the wing is bent upwards.